CN116791575A - Vibroflotation method capable of ensuring effective pile diameter of gravel pile - Google Patents
Vibroflotation method capable of ensuring effective pile diameter of gravel pile Download PDFInfo
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- CN116791575A CN116791575A CN202210255830.3A CN202210255830A CN116791575A CN 116791575 A CN116791575 A CN 116791575A CN 202210255830 A CN202210255830 A CN 202210255830A CN 116791575 A CN116791575 A CN 116791575A
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- 238000000034 method Methods 0.000 title claims abstract description 72
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 59
- 238000010276 construction Methods 0.000 claims abstract description 53
- 239000004575 stone Substances 0.000 claims abstract description 43
- 238000004080 punching Methods 0.000 claims abstract description 28
- 239000000945 filler Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 282
- 230000015572 biosynthetic process Effects 0.000 claims description 88
- 239000010865 sewage Substances 0.000 claims description 79
- 230000008569 process Effects 0.000 claims description 27
- 238000005056 compaction Methods 0.000 claims description 17
- 239000002689 soil Substances 0.000 claims description 16
- 230000002195 synergetic effect Effects 0.000 claims description 5
- 238000005755 formation reaction Methods 0.000 description 80
- 230000001276 controlling effect Effects 0.000 description 68
- 238000001514 detection method Methods 0.000 description 40
- 239000010410 layer Substances 0.000 description 30
- 238000012360 testing method Methods 0.000 description 18
- 239000004576 sand Substances 0.000 description 9
- 230000009471 action Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 239000008400 supply water Substances 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 238000012935 Averaging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000009918 complex formation Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
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- 230000002787 reinforcement Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil
- E02D3/054—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the soil involving penetration of the soil, e.g. vibroflotation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
-
- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a vibroflotation method capable of ensuring effective pile diameter of a gravel pile, which comprises the following steps: the vibroflotation construction of the broken stone pile hole is rapidly completed by controlling the water-gas linkage of the vibroflotation broken stone pile machine comprising the telescopic guide rod and the vibroflotation device; placing the gravel filler into the gravel pile hole, and enabling a vibroflotation device to vibroflotate and encrypt the surrounding gravel filler; during the vibration punching encryption of the surrounding crushed stone filler by the vibration punching device, an electromagnetic sensor arranged in the vibration punching device generates a real-time electromagnetic induction signal corresponding to the vibration amplitude of the vibration punching device; and controlling the vibroflotation encryption of the vibroflotation device according to the real-time electromagnetic induction signals generated by the electromagnetic sensor arranged in the vibroflotation device, so that the pile diameter of the gravel pile formed by the gravels filled in the gravel pile holes is equal to the effective pile diameter.
Description
Technical Field
The invention relates to the technical field of vibroflotation gravel piles, in particular to a vibroflotation method capable of ensuring effective pile diameter of a gravel pile.
Background
The vibroflotation method is a foundation treatment method, and the loose foundation soil layer is vibrated and sealed under the combined action of horizontal vibration of a vibroflotation device and high-pressure water or high-pressure air; or after the holes are formed in the foundation layer, backfilling hard coarse particle materials with stable performance, and forming a composite foundation by a reinforcement (vibroflotation pile) formed by vibration compaction and surrounding foundation soil.
In the construction process by using the vibroflotation method, if a special stratum with large hardness of undisturbed soil of a foundation and complex soil layer composition structure is encountered, when the construction effect cannot be guaranteed under the horizontal vibration action of the vibroflotation device, the stratum is subjected to water-flushing pre-destruction by high-pressure water, so that the penetration and pore-forming capacity of the vibroflotation device can be improved.
Technical Specification for Foundation treatment by the vibroflotation method of Water and electricity Hydraulic engineering (DL/T524-2016) stipulates that: the water pump is used for pressurizing water in the water storage facility and delivering the water to the vibroflotation device for supplying water. The multi-stage pump or the single-stage pump can be selected according to construction requirements so as to meet the principle of construction water pressure and water quantity. In general, a water pump having a water supply pressure of 0.3MPa to 1.0MPa and a water supply amount of not less than 15m3/h (250L/min) is selected.
The above-mentioned regulations are summarized based on the experience of engineering practice (the existing construction level of the domestic vibroflotation gravel pile is within 35m, and the stratum is relatively single shallow Kong Zhenchong), and only a general range of water supply pressure and water supply amount of the water pump is given, and no specific regulations are provided as to what water pressure should be adopted for what stratum. For deep coverage above 50m, there are often weak interlayers (e.g., lake deposited muddy clay) and relatively dense hard layers (e.g., sand layers or sand layers with gravel), which are quite different from the problems encountered in pore-forming, and therefore the above specifications have not been applicable to deep coverage formations above 50 m.
In addition, the vibroflotation encryption of the existing vibroflotation device is controlled according to the encryption current, but the encryption current cannot be accurately determined, so that the gravel pile obtained by carrying out the encryption control on the vibroflotation device according to the encryption current cannot be tightly combined with the soil layer.
Disclosure of Invention
The invention aims to overcome the problems in the prior art, and provides a vibroflotation method capable of ensuring the effective pile diameter of a gravel pile, wherein the supply of the downforce pressure is accurately controlled according to different formation compactedness, so that the vibroflotation construction of the deep-thick cover layer formation with the thickness of more than 50m is accelerated, and the gravel pile formed by vibroflotation gravel filler is tightly combined with a soil layer.
In order to achieve the above object of the present invention, the present invention provides the following technical solutions:
an vibroflotation method capable of ensuring effective pile diameter of gravel pile comprises the following steps:
the vibroflotation construction of the broken stone pile hole is rapidly completed by controlling the water-gas linkage of the vibroflotation broken stone pile machine comprising the telescopic guide rod and the vibroflotation device;
placing the gravel filler into the gravel pile hole, and enabling the vibroflotation device to vibroflotate and encrypt the surrounding gravel filler;
during the vibration punching encryption of the surrounding crushed stone filler by the vibration punching device, an electromagnetic sensor arranged in the vibration punching device generates a real-time electromagnetic induction signal corresponding to the vibration amplitude of the vibration punching device;
And controlling the vibroflotation encryption of the vibroflotation device according to the real-time electromagnetic induction signals generated by the electromagnetic sensor arranged in the vibroflotation device, so that the pile diameter of the gravel pile formed by the gravels filled in the gravel pile holes is equal to the effective pile diameter.
In one example, an electromagnetic sensor disposed within a vibroflotator comprises:
a support bar with one end mounted to the housing of the vibroflotation motor;
a spiral pipe installed at the other end of the supporting rod;
one end of the magnetic core is arranged on the inner side of the vibrator shell, and the other end of the magnetic core extends into the spiral pipe;
wherein the magnetic core moves in the solenoid along with the vibration of the vibroflotator shell, so that the solenoid obtains an electromagnetic induction signal with the amplitude corresponding to the vibration amplitude of the vibroflotator shell.
In another example, an electromagnetic sensor disposed within a vibroflotator includes:
a support bar with one end mounted to the housing of the vibroflotation motor;
a spiral tube mounted to the inside of the vibroflotation housing,
a magnetic core mounted on the other end of the support rod, the magnetic core extending into the spiral tube;
the solenoid tube moves relative to the magnetic core along with the vibration of the vibrator shell, so that the solenoid obtains an electromagnetic induction signal with the amplitude corresponding to the vibration amplitude of the vibrator shell.
Preferably, controlling the vibroflotation encryption of the vibroflotation device according to the real-time electromagnetic induction signal generated by the electromagnetic sensor arranged in the vibroflotation device comprises:
comparing the amplitude of the real-time electromagnetic induction signal with a preset amplitude;
when the amplitude of the electromagnetic induction signal is smaller than or equal to a preset amplitude, judging that the pile diameter of the gravel pile to be formed is equal to the effective pile diameter, and lifting the vibroflotation device upwards to vibroflotate the broken stone in the middle part of the gravel pile to be formed, so that the gravel pile with the pile diameter equal to the effective pile diameter is finally formed;
when the amplitude of the electromagnetic induction signal is larger than the preset amplitude, controlling the vibroflotation device to continuously vibroflotate the gravels embedded in the soil layer around the gravel pile hole.
Preferably, the preset amplitude is an amplitude at which the vibrator amplitude obtained in advance is reduced to the minimum.
Preferably, controlling the vibroflotation encryption of the vibroflotation device according to the real-time electromagnetic induction signal generated by the electromagnetic sensor arranged in the vibroflotation device comprises:
analyzing the amplitude of the front electromagnetic induction signal and the amplitude of the rear electromagnetic induction signal obtained by the electromagnetic sensor in the vibroflotation period;
When the amplitude of the rear electromagnetic induction signal is smaller than that of the front electromagnetic induction signal and is kept for a period of time, judging that the pile diameter of the gravel pile to be formed is equal to the effective pile diameter, and lifting the vibroflotation device upwards to vibroflotate broken stones in the middle part of the vibroflotation gravel pile to be formed, so that the gravel pile with the pile diameter equal to the effective pile diameter is finally formed.
Preferably, through controlling the water-gas linkage of the vibroflotation gravel pile machine comprising a telescopic guide rod and a vibroflotation device, the vibroflotation construction of the gravel pile hole is completed rapidly, and the method comprises the following steps:
controlling the discharge flow of the supplied sewage according to the current stratum compactness obtained in the vibroflotation construction process;
controlling the down-gas pressure of the supplied down-gas according to the current stratum compactness obtained in the vibroflotation construction process;
the vibrating and flushing device completes the vibrating and flushing construction of the broken stone pile hole under the synergistic effect of the sewage and the air supply by controlling the sewage flow of the sewage supplied by the vibrating and breaking pile machine and the air supply pressure of the sewage supplied by the air supply.
Preferably, the obtaining the current formation compactness in the vibroflotation construction process includes: acquiring the current vibroflotation current of a vibroflotation device; searching the formation compactness corresponding to the current vibroflotation current according to the preset corresponding relation between the vibroflotation current and the formation compactness; and determining the found formation compactness as the current formation compactness.
Preferably, the controlling the flow of the discharged water for supplying the discharged water according to the current formation compactness obtained in the vibroflotation construction process includes: acquiring the current sewage pressure of the supplied sewage; searching a target launching pressure corresponding to the current formation compactness according to the corresponding relation between the preset launching pressure and the formation compactness; and controlling the flow rate of the sewage supplied by the second water pump by comparing the current sewage pressure with the target sewage pressure, so that the current sewage pressure is positioned in the target sewage pressure range.
Preferably, the obtaining the current sewage pressure of the supply sewage includes: acquiring a plurality of instantaneous downwater pressures of the supplied downwater; the instantaneous water pressure is subjected to average treatment to obtain average water pressure; the resulting average downwater pressure is determined as the current downwater pressure.
Preferably, the controlling the discharge flow rate of the second water pump to supply the discharge water by comparing the current discharge pressure with the target discharge pressure includes: when the current sewage pressure is greater than the target sewage pressure upper limit, controlling the second water pump to reduce the sewage flow; when the current sewage pressure is smaller than the lower limit of the target sewage pressure, controlling the second water pump to increase the sewage flow; and when the current sewage pressure is within the target sewage pressure range, controlling the second water pump to maintain the sewage flow.
Preferably, the controlling the barometric pressure of the supplied barometric gas according to the current formation compactness obtained in the vibroflotation construction process includes: acquiring a down-draft pressure of the supplied down-draft; searching a target barometric pressure corresponding to the current formation compactness according to a preset correspondence between the barometric pressure and the formation compactness; and controlling the air pressure of the air supplied by the second air compressor by comparing the acquired air pressure with the target air pressure, so that the acquired air pressure is positioned in the target air pressure range.
Preferably, the controlling the flow rate of the water supply includes: acquiring the current water supply flow for supplying water; controlling the current water feeding flow to be positioned in the range of the target water feeding flow by comparing the current water feeding flow with the target water feeding flow; wherein the controlling the upper pressure of the supplied upper air includes: acquiring the upper air pressure of the supplied upper air; and controlling the upper air pressure of the upper air supplied by the first air compressor by comparing the acquired upper air pressure with the target upper air pressure, so that the acquired upper air pressure is positioned in the target upper air pressure range.
Preferably, the obtaining the current water supply flow rate of the supply water includes: acquiring a plurality of instantaneous water supply flows for supplying water; carrying out average treatment on the instantaneous water feeding flows to obtain average water feeding flows; and determining the obtained average water feeding flow as the current water feeding flow.
Preferably, the obtaining the current vibroflotation current of the vibroflotation device includes: detecting the vibroflotation current of the vibroflotation device in real time; the detected vibroflotation current is determined as the present vibroflotation current.
The beneficial effects of the invention are as follows:
1) For a deep and covered complex stratum, when only the drainage effect is not obvious, the invention respectively and accurately controls the supply quantity of drainage pressure and drainage pressure according to different stratum compactibility, so that the vibroflotation device smoothly completes deep hole vibroflotation construction of the complex stratum under the synergistic effect of proper drainage pressure and drainage pressure, thereby solving the difficult problem of deep and thick coverage stratum vibroflotation construction of more than 50 m;
2) According to the invention, by accurately controlling the water pressure, the water pressure in the telescopic guide rod is always higher than the external mud pressure, so that external mud is prevented from entering the telescopic guide rod from a gap of the telescopic guide rod; the current water feeding flow is controlled to be in the target water feeding flow range in the vibroflotation construction process, and the air feeding pressure is controlled to be in the target air feeding pressure range so as to remove a small amount of sand and stones entering the telescopic guide rod, so that the telescopic guide rod can freely stretch under the actions of water feeding and air feeding, and the deep hole vibroflotation construction of a complex stratum based on the telescopic guide rod can be reliably carried out;
3) Can tightly combine the gravel pile with surrounding soil layers, and the pile diameter of the gravel pile really meets the design requirement.
Drawings
FIG. 1 is a schematic view of a construction method for realizing the effective pile diameter of a gravel pile according to the present invention;
FIG. 2 is a schematic view of an vibroflotation gravel pile machine used in the present invention;
FIG. 3 is a schematic block diagram of a water-gas linkage control system of the vibroflotation gravel pile machine of the present invention;
FIG. 4 is a flow chart of a method of obtaining current formation compaction according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method for controlling water supply, air supply, water discharge and air discharge according to an embodiment of the present invention;
FIG. 6 is a flow chart of a method for controlling the flow of the offal supplied to the sewer according to the current formation compaction obtained during vibroflotation construction in accordance with an embodiment of the present invention;
FIG. 7 is a flow chart of a method for controlling down-gas pressure of supplied down-gas according to current formation compactness obtained during vibroflotation construction in accordance with an embodiment of the present invention;
FIG. 8 is a flow chart of a method of controlling the flow of water to supply the water supply according to an embodiment of the present invention;
FIG. 9 is a flow chart of a method of controlling the upper pressure of an supplied upper gas according to an embodiment of the present invention;
FIG. 10 is a schematic view of the present invention with an electromagnetic inductor disposed within the vibroflotator housing;
FIG. 11a is an enlarged schematic view of a first example of portion A of FIG. 10;
FIG. 11b is an enlarged schematic view of a second example of portion A of FIG. 10;
FIG. 12 is a schematic diagram of an encryption control section of the present invention for controlling the encryption control of the ballast filler by the vibroflotation device;
fig. 13 is a flowchart of a first embodiment of the vibroflotation encryption control performed by the encryption control section in fig. 12;
fig. 14 is a flowchart of a second embodiment of vibration encryption control by the encryption control section in fig. 12.
Detailed Description
Fig. 1 shows a construction method for realizing effective pile diameter of gravel pile, which comprises the following steps:
the method comprises the following steps of controlling the sewage of a vibroflotation gravel pile machine comprising a telescopic guide rod and a vibroflotation device, and rapidly completing vibroflotation construction of a gravel pile hole;
placing the gravel filler into the gravel pile hole, and enabling the vibroflotation device to vibroflotate and encrypt the surrounding gravel filler;
during the vibration punching encryption of the surrounding crushed stone filler by the vibration punching device, an electromagnetic sensor arranged in the vibration punching device generates a real-time electromagnetic induction signal corresponding to the vibration amplitude of the vibration punching device;
and controlling the vibroflotation encryption of the vibroflotation device according to the real-time electromagnetic induction signals generated by the electromagnetic sensor arranged in the vibroflotation device, so that the pile diameter of the gravel pile formed by the gravels filled in the gravel pile holes is equal to the effective pile diameter.
The effective pile diameter of the gravel pile is the pile diameter of the gravel pile formed in the gravel pile hole and tightly combined with soil layers around the hole. The effective pile diameter of the gravel pile has the following significance:
firstly, tightly combining gravel piles formed in gravel pile holes with soil layers around the holes;
secondly, the effective pile diameter of the gravel pile is the pile diameter of the gravel pile meeting the vibroflotation encryption requirement, so that the actual pile diameter is not required to be calculated in the vibroflotation construction process, and the vibroflotation construction process is quickened.
According to the real-time electromagnetic induction signal generated by the electromagnetic sensor arranged in the vibroflotation device, the vibroflotation encryption of the vibroflotation device is controlled, and the method comprises the following steps:
comparing the amplitude of the real-time electromagnetic induction signal with a preset amplitude;
when the amplitude of the electromagnetic induction signal is smaller than or equal to a preset amplitude, judging that the pile diameter of the gravel pile to be formed is equal to the effective pile diameter, and lifting the vibroflotation device upwards to vibroflotate the broken stone in the middle part of the gravel pile to be formed, so that the gravel pile with the pile diameter equal to the effective pile diameter is finally formed;
when the amplitude of the electromagnetic induction signal is larger than the preset amplitude, controlling the vibroflotation device to continuously vibroflotate the gravels embedded in the soil layer around the gravel pile hole.
The preset amplitude of the present invention is an amplitude at which the vibrator amplitude obtained in advance is reduced to the minimum.
According to the real-time electromagnetic induction signal generated by the electromagnetic sensor arranged in the vibroflotation device, the vibroflotation encryption of the vibroflotation device is controlled, and the method comprises the following steps:
analyzing the amplitude of the front electromagnetic induction signal and the amplitude of the rear electromagnetic induction signal obtained by the electromagnetic sensor in the vibroflotation period;
when the amplitude of the rear electromagnetic induction signal is smaller than that of the front electromagnetic induction signal and is kept for a period of time, judging that the pile diameter of the gravel pile to be formed is equal to the effective pile diameter, and lifting the vibroflotation device upwards to vibroflotate broken stones in the middle part of the vibroflotation gravel pile to be formed, so that the gravel pile with the pile diameter equal to the effective pile diameter is finally formed.
Fig. 2 shows an vibroflotation gravel pile machine 1000 used in the gravel pile construction process of the present invention. As shown in fig. 2, the vibroflotation gravel pile machine 1000 includes a lifting device, a guide rod 10, a vibroflotation device 13 and an automatic feeding device.
Specifically, the hoisting device comprises a host machine of the vibroflotation gravel pile machine, a mast 11 connected with the host machine, and a main hoisting device arranged at the rear end of the host machine, wherein a guide rod 10 is hoisted through a steel wire rope of the main hoisting device and the mast 11, so that the guide rod is vertically arranged under the action of dead weight.
In addition, an automatic feeding device is arranged on the main machine, is arranged at the rear part of the main machine of the hoisting device and can be used as a counterweight of the main machine. The automatic feeding device comprises an air pipe winding device, a cable winding device and a water pipe winding device, and the three devices and the main winding device are arranged to synchronously feed.
The guide bar 10 has a connection section at the upper part for connection with the wire rope of the main winding device, a support section at the middle and a working section at the lower part for connection with the vibrator 13. The guide rod 10 is a telescopic guide rod, so that the axial length of the guide rod 10 can be adjusted to change the lowering or lifting position of the vibroflotation system relative to the ground. That is, the guide bar 10 has a plurality of layers of sleeves sequentially sleeved from inside to outside, the connecting section is a top layer sleeve, the working section is a bottom layer sleeve, and the supporting section comprises one or more layers of middle sleeves. Wherein, adjacent two-layer sleeve pipe can adopt prior art's connection structure to link together, can make adjacent two-layer sleeve pipe axial slip smooth, can prevent again that torsion from taking place each other. When the guide rod is in operation, the number and the length of the multi-layer sleeves in the guide rod can be determined according to the use requirement, for example, more than 4 layers of sleeves can be adopted, and the length of each layer of sleeve can be 18-25 meters (the length of the sleeve on the top layer can be longer). When the pile is used, the length of the multi-layer sleeve of the guide rod can be prolonged or shortened, and when the multi-layer sleeve of the telescopic guide rod is fully extended, the total length of the telescopic guide rod can reach 100 meters or even longer, so that the vibroflotation gravel pile machine can be used for vibroflotation and hole making of a stratum with the depth of more than 50 meters.
The water-gas linkage control of the vibroflotation gravel pile machine comprises the following steps: in the vibroflotation construction process, the water supply flow rate for supplying water and the air supply pressure for supplying air are controlled in real time, so that the telescopic guide rod can be freely telescopic under the combined action of water supply and air supply; acquiring the current stratum compactness in the vibroflotation construction process; according to the current formation compactness, the water discharge flow of the supplied sewer and the air pressure of the supplied sewer are controlled in real time, so that the vibroflotation device and the sewer work together to complete vibroflotation construction of the broken stone pile hole.
The invention is suitable for deep hole vibroflotation with complex stratum, and ensures the smooth progress of deep hole vibroflotation construction by automatically controlling the water supply and the air supply in the vibroflotation construction process and automatically controlling the water supply and the air supply according to the current stratum compactness.
As shown in fig. 5, the embodiment provides a water-gas linkage control method of an vibroflotation gravel pile machine, which includes:
s100, a pipeline for supplying water and air goes deep into the lower part of the telescopic guide rod from the top of the telescopic guide rod, so that the water and the air form water flow and air flow from bottom to top in the telescopic guide rod under the action of a baffle at the lower part of the telescopic guide rod and flow out from the top of the telescopic guide rod;
S101, enabling a pipeline for supplying the sewage to pass through a telescopic guide rod and a vibroflotation device and then extend out of the bottom end of the vibroflotation device, so that the sewage is sprayed out of the bottom end of the vibroflotation device to perform water flushing pre-damage on a stratum;
s102, enabling a pipeline for supplying the down gas to penetrate through the telescopic guide rod and extend out of the side wall of the bottom sleeve of the telescopic guide rod, so that the down gas is sprayed out of the bottom of the telescopic guide rod to perform gas-flushing pre-damage on a stratum;
s103, controlling the internal water pressure of the telescopic guide rod to be always larger than the external slurry pressure in the vibroflotation construction process so as to prevent external slurry from entering the telescopic guide rod from a gap of the telescopic guide rod; at the same time
S104, controlling water feeding flow for supplying water and air feeding pressure for supplying air feeding so as to remove a small amount of sand and stone entering the telescopic guide rod under the synergistic effect of the water feeding and the air feeding;
s105, controlling the discharge flow of the supplied sewage according to the current stratum compactness obtained in the vibroflotation construction process; and
s106, controlling the down-gas pressure of the supplied down-gas according to the current stratum compactness obtained in the vibroflotation construction process;
s107, controlling the flow rate of the sewage and the pressure of the sewage, so that the vibroflotation device completes vibroflotation construction under the synergistic effect of the sewage and the sewage.
The following describes the sewage control method of the present embodiment in detail with reference to the accompanying drawings.
As shown in fig. 4, obtaining the current formation compaction during the vibroflotation construction process includes:
s201, acquiring the current vibroflotation current of a vibroflotation device;
s202, searching the formation compactness corresponding to the current vibroflotation current according to the preset corresponding relation between the vibroflotation current and the formation compactness;
and S203, determining the found formation compactness as the current formation compactness.
As shown in fig. 3, the vibroflotation device 3 is connected with the controller 1 through the vibroflotation device frequency conversion cabinet 2, and the vibroflotation device frequency conversion cabinet 2 and the controller 1 are in wireless connection, or can be in wired connection.
In one implementation of this embodiment, when a stratum with a locally uniform distribution is encountered, the obtained instantaneous value of the vibroflotation current is stable, and S201 obtaining the current vibroflotation current of the vibroflotation device is achieved by: acquiring an instantaneous value of the vibroflotation current of the vibroflotation device; and determining the obtained instantaneous value of the vibroflotation current as the current vibroflotation current.
When the embodiment is implemented, the controller 1 acquires the vibroflotation current signal of the vibroflotation device 3 from the vibroflotation device frequency conversion cabinet 2, and determines the acquired vibroflotation current as the current vibroflotation current. Or, a current detection sensor (not shown in the figure) is arranged on a vibroflotation line of the vibroflotation frequency conversion cabinet 2 connected with the vibroflotation 3; when the vibroflotation device 3 is started, a vibroflotation current signal is generated by the current detection sensor, and the vibroflotation current signal is transmitted to the controller 1 in real time in a wired or wireless mode. The controller 1 determines the vibroflotation current transmitted from the current detection sensor in real time as the present vibroflotation current. The current detection sensor may be any sensor capable of detecting current in the prior art. Such as a current transformer.
In another implementation of this embodiment, when a formation with a locally unevenly distributed is encountered, the instantaneous value of the obtained vibroflotation current jumps greatly, and S201 obtains the current vibroflotation current of the vibroflotation device by: acquiring a plurality of instantaneous values of vibroflotation current of a vibroflotation device; carrying out average treatment on the obtained instantaneous values of the plurality of vibroflotation currents to obtain average vibroflotation currents; the average vibroflotation current is determined as the present vibroflotation current. And the interval time for acquiring the adjacent two instantaneous values of the vibroflotation current is equal. The method for carrying out average treatment on the obtained instantaneous values of the plurality of vibroflotation currents comprises the following steps: continuously obtaining n (n is more than or equal to 2) instantaneous values of the vibroflotation current, braiding the n instantaneous values of the vibroflotation current into a queue, adding the n instantaneous values of the vibroflotation current in the queue, and taking an average value; adding one instantaneous value of the vibroflotation current newly obtained each time into the tail of the queue, removing one instantaneous value of the vibroflotation current at the same time, forming a new queue, adding n instantaneous values of the vibroflotation current in the new queue, and taking an average value.
In the embodiment, the method of obtaining the instantaneous value of the vibroflotation current is the same as that of the previous embodiment. Specifically, a current average processing module is arranged in the controller, the controller obtains instantaneous values of the vibroflotation current from the vibroflotation frequency conversion cabinet 2 or the current detection sensor, and n (n is more than or equal to 2) instantaneous values of the vibroflotation current in the queue are subjected to average processing through the current average processing module, so that average vibroflotation current is obtained; the controller determines the average vibroflotation current as the present vibroflotation current.
S202, searching the formation compactness corresponding to the current vibroflotation current according to the preset corresponding relation between the vibroflotation current and the formation compactness; and S203, determining the found formation compactness as the current formation compactness. The specific implementation mode is as follows:
the corresponding relation between the vibroflotation current and the formation compactness is preset in the controller. The corresponding relation between the vibroflotation current and the formation compactness is obtained through a test, namely, before the formal construction, a test pile is firstly made on site, and the controller analyzes and determines the corresponding relation between the vibroflotation current and the formation compactness through a large amount of data obtained by the test pile.
In one implementation of this example, the correspondence between vibroflotation current and formation compaction is shown in table 1. The formation compactness is divided into three grades of soft, medium and hard, and the corresponding relation between the formation compactness and the vibroflotation current of different grades is obtained through field test data.
TABLE 1 correspondence between vibroflotation current and formation compaction
| Vibroflotation current I | Formation solidity Dr |
| I<0.3Ie | Soft and soft |
| 0.3Ie≤I<0.8Ie | In (a) |
| I≥0.8Ie | Hard |
Here, ie shown in table 1 is the rated current of the vibrator.
After the controller obtains the current vibroflotation current, the formation compactness corresponding to the current vibroflotation current is determined as the current formation compactness through the lookup table 1. For example, when the controller 1 obtains the current vibroflotation current i=0.3 Ie, the current formation compaction is determined as a middle level by looking up table 1.
It should be noted that table 1 only shows one correspondence between vibroflotation current and formation compactness, and for more complex formations, the controller may also obtain other more complex correspondences according to field test data.
Wherein, S105 controls the flow of the sewer water to be supplied according to the current formation compactness obtained in the vibroflotation construction process, as shown in fig. 6, including:
s301, acquiring the current sewage pressure of the supplied sewage;
s302, searching a target launching pressure corresponding to the current formation compactness according to a preset corresponding relation between the launching pressure and the formation compactness;
s303, controlling the water discharge flow of the second water pump for supplying the water discharge by comparing the current water discharge pressure with the target water discharge pressure, so that the current water discharge pressure is positioned in the target water discharge pressure range.
The controller converts a difference signal between the current sewage pressure and the target sewage pressure into a control signal to control the sewage flow of the second water pump for supplying the sewage, so that the current sewage pressure is positioned in the target sewage pressure range.
In this embodiment, the plunger pump BW450 is used to supply the sewage, and other pumps may be used to supply the sewage, so long as the supplied sewage pressure and the supplied sewage flow meet the requirements.
Because the plunger pump water supply has the characteristics of larger fluctuation of the pulsating pressure and the instantaneous flow, the plunger pump water supply has the advantages that: s301 obtains a current sewage pressure of the supply sewage, including:
s401, acquiring a plurality of instantaneous sewage pressures for supplying sewage;
s402, carrying out average treatment on the instantaneous water pressures to obtain average water pressure;
and S403, determining the obtained average sewer pressure as the current sewer pressure.
Wherein, when a plurality of instantaneous water pressure of the supply sewage is obtained in S401, the interval time of obtaining the adjacent two instantaneous water pressures is equal.
In one implementation of this embodiment, S402 averages the plurality of instantaneous water pressures to obtain an average water pressure, which is specifically as follows: and forming a sampling interval by continuously acquiring n (n is more than or equal to 2) instantaneous downwater pressures, adding the n instantaneous downwater pressures in the sampling interval, and then taking an arithmetic average value.
In another implementation manner of this embodiment, S402 averages the plurality of instantaneous water pressures to obtain an average water pressure, which is specifically as follows: and forming a sampling interval by continuously acquiring n (n is more than or equal to 2) instantaneous water pressure, and solving the root mean square of the n instantaneous water pressure in the sampling interval.
In the two embodiments, the n instantaneous downwater pressures in the previous sampling interval are not overlapped with the n instantaneous downwater pressures in the next sampling interval. For example, the first sample interval contains the 1 st, 2 nd instantaneous downwater pressure, the second sample interval contains the 3 rd, 4 th instantaneous downwater pressure, and so on.
In the implementation of the above two embodiments, as shown in fig. 3, a second water supply pressure detection sensor 41 and a second water supply flow rate detection sensor 42 are installed on the water outlet pipe of the second water pump 4, and are respectively used for detecting the instantaneous sewage pressure and the instantaneous sewage flow rate of the sewage supplied by the second water pump 4 in real time. The second water supply pressure detection sensor 41 and the second water supply flow rate detection sensor 42 may employ any sensor capable of detecting water pressure and water flow rate in the related art. For example, the second water supply pressure detection sensor 41 may employ a pressure transmitter, and the second water supply flow rate detection sensor 42 may employ an electromagnetic flowmeter.
A pressure signal averaging circuit is added to the inside of the second water supply pressure detecting sensor 41 for averaging the n instantaneous downwater pressures continuously detected by the second water supply pressure detecting sensor 41 to obtain an average downwater pressure, and the controller 1 collects the average downwater pressure and determines the average downwater pressure as the current downwater pressure.
In addition, a flow signal averaging circuit is added inside the second water supply flow detection sensor 42, and is used for averaging the continuous n instantaneous water flows to obtain an average water flow rate, and the controller 1 determines the collected average water flow rate as the current water flow rate.
As shown in fig. 3, the second water supply pressure detection sensor 41 and the second water supply flow rate detection sensor 42 transmit the average sewage pressure signal and the average sewage flow rate signal to the remote terminal unit RTU, which transmits the signals to the controller 1 by wireless.
A pressure signal average processing module and a flow signal average processing module may be added in the controller, and the controller may perform an average process on the n instantaneous downwater pressures transmitted from the second water supply pressure detecting sensor 41 and an average process on the n instantaneous downwater flows transmitted from the second water supply flow detecting sensor 42, to obtain an average downwater pressure and an average downwater flow, respectively, and determine the average downwater pressure as the current downwater pressure and the average downwater flow as the current downwater flow.
S302, searching a target launching pressure corresponding to the current formation compactness according to a preset corresponding relation between the launching pressure and the formation compactness, wherein the specific implementation mode is as follows:
The corresponding relation between the sewage pressure and the formation compactness is preset in the controller. The corresponding relation between the drainage pressure and the formation compactness is obtained through a test, namely, before the formal construction, a test pile is firstly made on site, and the controller analyzes and determines the corresponding relation between the drainage pressure and the formation compactness through a large amount of data obtained by the test pile.
In one implementation of this example, the correlation of the drainage pressure to formation compaction is shown in table 2. The formation compactness is divided into three grades of soft, medium and hard, and the corresponding relation between the formation compactness of different grades and the sewage pressure is obtained through field test data.
TABLE 2 correspondence between the downforce pressure and formation compaction
| Downdraft pressure P (MPa) | Formation solidity Dr |
| 0.3～0.5 | Soft and soft |
| 0.5～0.7 | In (a) |
| 0.7～0.8 | Hard |
The controller 1 finds a target sewage pressure corresponding to the current formation compactness by looking up the table 2. As shown in table 2, the lower and upper limits are set for the lower water pressure for each level of formation compaction. For example, when the controller 1 determines the current formation compactness as a middle level through the lookup table 1, the target sewage pressure corresponding to the middle level current formation compactness is found to be 0.5 to 0.7MPa through the lookup table 2.
It should be noted that table 2 only shows one correspondence between the pressure of the sewage and the formation compactness, and for more complex formations, the controller may also obtain other more complex correspondences according to the field test data.
Wherein, S303 controls the second pump to supply the water discharge flow of the water discharge by comparing the current water discharge pressure with the target water discharge pressure, so that the current water discharge pressure is located in the target water discharge pressure range, and the method specifically comprises: when the current sewage pressure is greater than the target sewage pressure upper limit, controlling the second water pump 4 to reduce the sewage flow; when the current sewage pressure is smaller than the lower limit of the target sewage pressure, the second water pump 4 is controlled to increase the sewage flow; when the current sewage pressure is within the target sewage pressure range, the second water pump 4 is controlled to maintain the sewage flow rate.
As shown in fig. 3, in this embodiment, the second water pump 4 is connected to the controller 1 through the second water pump variable frequency cabinet 5, and the second water pump variable frequency cabinet 5 and the controller 1 are connected wirelessly, or may be connected by a wire. The controller 1 controls the rotation speed of the second water pump 4 by controlling the second water pump variable frequency cabinet 5 to change the output frequency, so as to change the discharge flow of the second water pump 4 for supplying the discharge water, and when the discharge flow of the second water pump discharged from the water outlet pipeline is increased, the discharge water pressure is also increased; when the discharge flow rate of the second water pump water outlet pipeline is reduced, the discharge pressure is also reduced.
In the vibroflotation construction process, if only the drainage is supplied, the auxiliary supply of the drainage is carried out when the construction effect is not obvious.
The following describes the air control method in this embodiment in detail with reference to the drawings.
Wherein, S106 controls the down-gas pressure of the supplied down-gas according to the current formation compactness obtained in the vibroflotation construction process, as shown in fig. 7, including:
s501, acquiring the down-draft pressure of the supplied down-draft;
s502, searching a target barometric pressure corresponding to the current formation compactness according to a preset correspondence between barometric pressure and formation compactness;
s503, comparing the obtained down air pressure with the target down air pressure, and controlling the down air pressure of the second air compressor to supply down air, so that the obtained down air pressure is within the target down air pressure range.
The controller converts the acquired difference signal between the down air pressure and the target down air pressure into a control signal to control the down air pressure supplied by the second air compressor to be within the target down air pressure range.
The current formation compactness is obtained through the launch control method.
In this embodiment S501, the obtaining of the down-draft pressure of the supplied down-draft specifically includes: and detecting the instantaneous downward air pressure of the downward air supplied by the second air compressor in real time, and acquiring the instantaneous downward air pressure with equal interval time.
In one implementation of this embodiment, the method for obtaining the downdraft pressure is as follows:
As shown in fig. 3, a gas storage tank is disposed at the outlet of the second air compressor 8, and a second gas supply pressure detection sensor 81 is mounted on the gas outlet pipe of the gas storage tank for detecting the instantaneous downdraft pressure of the downdraft supplied from the second air compressor 8. The second air supply pressure detection sensor 81 may be any sensor capable of detecting air pressure in the related art. For example, a pressure transmitter may be employed.
In addition, a second air supply flow rate detection sensor 82 is installed on an air outlet pipe of the air tank of the second air compressor 8 for detecting the lower air flow rate of the lower air supplied from the second air compressor 8. The second supply air flow rate detection sensor 82 may be any sensor capable of detecting the amount of air flow in the related art. For example, a vortex shedding flowmeter may be employed.
The second air supply pressure detection sensor 81 and the second air supply flow rate detection sensor 82 transmit the detected pressure signal and flow rate signal to the remote terminal unit RTU, which transmits the signals to the controller 1 by wireless.
Wherein, S502 searches for a target down-gas pressure corresponding to the current formation compactness according to a preset relationship between the down-gas pressure and the formation compactness, and the specific implementation manner is as follows:
the controller is preset with the corresponding relation between the down-gas pressure and the formation compactness. The corresponding relation between the down-pressure and the formation compactness is obtained through a test, namely, before the formal construction, a test pile is firstly made on site, and the controller analyzes and determines the corresponding relation between the down-pressure and the formation compactness through a large amount of data obtained by the test pile.
In one implementation of this example, the relationship between barometric pressure and formation compaction is shown in table 3. The formation compactness is divided into three grades of soft, medium and hard, and the corresponding relation between the formation compactness of different grades and the down-pressure is obtained through field test data.
TABLE 3 correspondence between downdraft pressure and formation compaction
| Down-draft pressure P (MPa) | Formation solidity Dr |
| 0 | Soft and soft |
| 0.3～0.5 | In (a) |
| 0.7～0.8 | Hard |
The controller 1 finds a target barometric pressure corresponding to the current formation compaction by looking up table 3. As shown in table 3, the lower gas pressure for each level of formation compaction sets upper and lower limits. For example, when the controller 1 determines the current formation compactness as a middle level through the lookup table 1, the target downgas pressure corresponding to the middle level current formation compactness is found to be 0.3-0.5 MPa through the lookup table 3.
It should be noted that table 3 only shows one correspondence between the downdraft pressure and the formation compactness, and for more complex formations, the controller may also obtain other more complex correspondences according to the field test data.
Wherein, S503 controls the air pressure of the air supplied by the second air compressor by comparing the obtained air pressure with the target air pressure, so that the obtained air pressure is within the target air pressure range, and specifically includes:
When the acquired lower air pressure is greater than the upper limit of the target lower air pressure, controlling the second air compressor to reduce the lower air pressure; when the acquired lower air pressure is smaller than the lower limit of the target lower air pressure, controlling the second air compressor to increase the lower air pressure; and when the acquired lower air pressure is within the target lower air pressure range, controlling the second air compressor to maintain the lower air pressure.
In one implementation of this embodiment, as shown in fig. 3, a second electric control valve 9 is mounted on the air outlet pipe of the air tank, and the air pressure is controlled by controlling the valve opening of the second electric control valve 9. As shown in fig. 3, the controller 1 of the present embodiment transmits a valve opening signal to the remote terminal unit RTU by wireless, and controls the valve opening of the second electric control valve 9 by the RTU. When the valve of the second electric regulating valve 9 is opened, the lower air flow is increased, and the lower air pressure is also increased; when the valve of the second electric control valve 9 is opened, the lower air flow rate decreases, and the lower air pressure also decreases.
For the deep and covered complex stratum, the embodiment respectively and automatically controls the supply quantity of the lower water pressure and the lower air pressure according to the compactness of different strata, thereby smoothly completing deep hole vibroflotation construction by matching with a vibroflotation device.
Deep hole vibroflotation construction based on a telescopic guide rod needs to be matched with water supply.
The water supply control method of this embodiment will be described in detail with reference to the accompanying drawings.
Water supply control principle in this embodiment: 1. controlling the water pressure, controlling the water pressure in the telescopic guide rod to be always larger than the mud pressure of the pile hole, forcing the water in the telescopic guide rod to flow from the sleeve gap of the telescopic guide rod to mud in the pile hole, and realizing the water pressure dynamic balance in the pipe so as to prevent sand and stone in the mud from entering and being blocked in the sleeve gap; 2, controlling the water feeding flow, and in the process that the water feeding flows upwards from the top of the bottom sleeve to the top sleeve and then is discharged, keeping the water feeding flow in the telescopic guide rod at a certain level, so as to bring out a small amount of sand and stone which accidentally enters the telescopic guide rod, and avoiding being blocked in a sleeve gap.
Based on the principle, the water feeding flow is controlled in real time on the basis of guaranteeing the dynamic balance of the water pressure in the pipe, so that the pipe clamping can be avoided, and the purpose of freely stretching the stretching guide rod is achieved.
Wherein, S103 is in the shake-wash work progress, and the inside upper water pressure of control flexible guide arm is greater than outside mud pressure all the time, and concrete implementation is as follows:
the internal water pressure of the telescopic guide rod comprises the water pressure (ρ) Water and its preparation method gh) and the water pressure (delta P) supplied by the first water pump, the water pressure inside the telescopic guide rod is always larger than the external mud pressure, namely the water pressure (rho) inside the telescopic guide rod is controlled Water and its preparation method gh) and the first water pump supply a water pressure (deltaP) which is greater than the mud pressure (ρ) in the outer pile hole of the telescopic guide rod Pulp gh), i.e. the water supply pressure (deltap) of the first water pump is controlled to be greater than the mud pressure (ρ) in the outer pile hole of the telescopic guide rod Pulp gh) and the hydrostatic pressure (ρ) in the telescopic guide rod Water and its preparation method gh), i.e. ΔP > ρ Pulp gh-ρ Water and its preparation method gh。
Wherein ρ is Water and its preparation method ＝1g/cm 3 ，ρ Pulp ＝1.4g/cm 3 G is approximately 10m/s, and if h=100 m, ΔP > 0.4MPa.
According to the calculation, when the hole depth is 100m, the hydraulic dynamic balance in the telescopic guide rod can be kept by controlling the water pressure supplied by the first water pump to be greater than 0.4MPa, so that sand in mud is prevented from entering and being blocked in a sleeve gap.
In particular, the first water pump 6 may be a water pump with a minimum pump pressure of greater than 0.4MPa. For example, plunger pump BW320 is used with a minimum pump pressure of 1.5MPa.
Specifically, the internal water pressure of the telescopic guide rod is controlled to be always larger than the external slurry pressure, namely, the water pressure supplied by the first water pump is controlled to be realized in the following manner: acquiring the current water supply pressure of supply water; controlling the water supply pressure of the first water pump to supply water by comparing the current water supply pressure with the reference water supply pressure, so that the current water supply pressure is greater than or equal to the reference water supply pressure; wherein, the sum of the reference water pressure and the internal water pressure of the telescopic guide rod is always larger than the external mud pressure.
The specific embodiment of obtaining the current upper water pressure can be seen from the current lower water pressure. When the hole depth is 100m, the reference water pressure is 0.4MPa.
Under the condition that the current water supply pressure is larger than the reference water supply pressure, the embodiment brings out a small amount of sand and stone which accidentally enters the telescopic guide rod through controlling the water supply flow in real time, and the sand and stone are prevented from being clamped in a sleeve gap.
Wherein, S104 controls the flow rate of the water supply and, as shown in fig. 8, includes:
s601, acquiring the current water supply flow of the water supplied by a first water pump;
s602, controlling the water supply flow of the first water pump to supply water by comparing the current water supply flow with the target water supply flow, so that the current water supply flow is positioned in the range of the target water supply flow.
The controller converts a difference signal of the current water feeding flow and the target water feeding flow into a control signal, and controls the first water pump to supply the water feeding flow of the water feeding, so that the current water feeding flow is located in the range of the target water feeding flow.
Wherein, the specific implementation mode of obtaining the current water supply flow of the first water pump to supply water in S601 refers to obtaining the current water supply flow.
In this embodiment S602, by comparing the current water supply flow with the target water supply flow, the water supply flow of the first water pump is controlled, which specifically includes: when the current water feeding flow is larger than the upper limit of the target water feeding flow, controlling the first water pump 6 to reduce the water feeding flow; when the current water feeding flow is smaller than the lower limit of the target water feeding flow, the first water pump 6 is controlled to increase the water feeding flow; when the current water feed flow is within the target water feed flow range, the first water pump 6 is controlled to maintain the water feed flow.
In one implementation of the present example, the target upper water flow range is set to 280+ -10L/min. The maximum flow 320L/min of the plunger pump BW320 is greater than the target water flow. Other first water pumps 6 that meet the water supply requirements of the present embodiment are also selectable.
As shown in fig. 3, a first water supply pressure detection sensor 61 and a first water supply flow rate detection sensor 62 are installed on the water outlet pipe of the first water pump 6 for detecting the instantaneous water supply pressure and the instantaneous water supply flow rate of the water supplied from the first water pump 6 in real time, respectively. The first water supply pressure detection sensor 61 and the first water supply flow rate detection sensor 62 may employ any sensor capable of detecting water pressure and water flow rate in the related art. For example, the first water supply pressure detection sensor 61 may employ a pressure transmitter, and the first water supply flow rate detection sensor 62 may employ an electromagnetic flowmeter.
As shown in fig. 3, the first water pump 6 is connected with the controller 1 through the first water pump variable frequency cabinet 7, and the first water pump variable frequency cabinet 7 and the controller 1 are in wireless connection, or can be in wired connection. The controller 1 controls the rotation speed of the first water pump 6 by changing the output frequency of the first water pump variable frequency cabinet 7, so as to change the water feeding flow of the first water pump 6 for feeding water, and the current water feeding flow is positioned in the target water feeding flow range.
In one implementation manner of this embodiment, the plunger pump is used to supply the water, the method for obtaining the current water flow and the current water pressure by the controller 1 refers to the method for obtaining the current water flow and the current water pressure by the controller 1 by using the plunger pump to supply the water, and the method for obtaining the current water flow and the current water pressure by the controller 1 is not repeated.
Deep hole vibroflotation construction based on telescopic guide rod, if only supplying water, auxiliary supplying air when construction effect is not obvious.
The following describes the air control method in this embodiment in detail with reference to the drawings.
Wherein, S104 controls the upper air pressure of the supplied upper air, as shown in fig. 9, including:
s701, obtaining the air supply pressure of the air supply of the first air compressor;
s702, controlling the upper air pressure of the upper air supplied by the first air compressor by comparing the acquired upper air pressure with the target upper air pressure, so that the acquired upper air pressure is within the target upper air pressure range.
Wherein, S701 obtains the upper air pressure of the upper air supplied by the first air compressor, which specifically includes: and detecting the instantaneous upper air pressure of the upper air supplied by the first air compressor in real time, and acquiring the instantaneous upper air pressure with equal interval time.
In one implementation of this embodiment, the method for obtaining the barometric pressure is as follows:
As shown in fig. 3, an air storage tank is arranged at the outlet of the first air compressor, and a first air supply pressure detection sensor is installed on the air outlet pipe of the air storage tank and used for detecting the instantaneous air supply pressure of the air supplied by the first air compressor. The first air supply pressure detection sensor may be any sensor capable of detecting air pressure in the related art. For example, a pressure transmitter may be employed.
In addition, a first air supply flow detection sensor is arranged on an air outlet pipeline of the air storage tank of the first air compressor and used for detecting the upper air flow of the upper air supplied by the first air compressor. The first supply air flow rate detection sensor may be any sensor capable of detecting the amount of air flow in the related art. For example, a vortex shedding flowmeter may be employed.
The first air supply pressure detection sensor and the first air supply flow detection sensor transmit the detected pressure signal and flow signal to the remote terminal unit RTU, which transmits the signals to the controller 1 by wireless.
The step S702 of comparing the obtained upper air pressure with the target upper air pressure, controlling the upper air pressure of the upper air supplied by the first air compressor to enable the obtained upper air pressure to be within the target upper air pressure range, and specifically includes:
when the acquired upper air pressure is greater than the upper limit of the target upper air pressure, controlling the first air compressor to reduce the upper air pressure; when the acquired upper air pressure is smaller than the lower limit of the target upper air pressure, controlling the first air compressor to increase the upper air pressure; and when the acquired upper air pressure is within the target upper air pressure range, controlling the first air compressor to maintain the upper air pressure.
In one embodiment of the present example, the target upper pressure range is set to 0.3 to 0.4MPa.
As shown in fig. 3, a first electric regulating valve is installed on an air outlet pipe of the air storage tank, and the air charging pressure is controlled by controlling the valve opening of the first electric regulating valve. As shown in fig. 3, the controller 1 of the present embodiment transmits a valve opening signal to the remote terminal unit RTU by wireless, and controls the valve opening of the first electric control valve by the RTU. When the valve of the first electric regulating valve is opened, the upper air flow is increased, and the upper air pressure is also increased; when the valve of the first electric regulating valve is opened, the upper air flow is reduced, and the upper air pressure is also reduced.
The embodiment adopts an SV-70 type vibroflotation gravel pile machine, a telescopic guide rod is connected with the vibroflotation device, and the water-gas linkage automatic control process is as follows:
1. after the vibroflotation device 3 is started, the second water supply pressure detection sensor 41 detects instantaneous water pressure in real time, the second water supply flow detection sensor 42 detects instantaneous water flow in real time, the second air supply pressure detection sensor 81 detects instantaneous air pressure in real time, the second air supply flow detection sensor 82 detects instantaneous air flow in real time, the first water supply pressure detection sensor 61 detects instantaneous water pressure in real time, the first water supply flow detection sensor 62 detects instantaneous water flow in real time, the first air supply pressure detection sensor detects instantaneous air pressure in real time, and the first air supply flow detection sensor detects instantaneous air flow in real time;
2. The controller 1 obtains current vibroflotation current, current water pressure, current water discharge flow, lower air pressure, lower air flow, current water pressure, current water discharge flow, upper air pressure and upper air flow;
3. the controller 1 determines the current formation compactness corresponding to the current vibroflotation current according to the obtained current vibroflotation current lookup table 1; determining a target sewage pressure corresponding to the current formation compactness through a lookup table 2; determining a target barometric pressure corresponding to the current formation compaction by looking up table 3;
4. the controller 1 compares the obtained current launching pressure with the target launching pressure which is determined by searching, converts the difference signal into a control signal to control the output frequency of the second water pump variable-frequency cabinet 5, and changes the launching flow of the second water pump 4 by controlling the rotating speed of the second water pump 4 so as to change the launching pressure, so that the current launching pressure is positioned in the target launching pressure range;
the controller 1 compares the obtained down-pressure with the target down-pressure determined by searching, and converts the difference signal into a control signal to control the valve opening of the second electric regulating valve 9, so as to change the down-pressure to enable the down-pressure to be in the target down-pressure range;
The controller 1 compares the obtained current water feeding flow with the target water feeding flow, converts the difference signal into a control signal to control the output frequency of the first water pump variable-frequency cabinet 7, and controls the rotation speed of the first water pump 6 to change, so that the current water feeding flow is positioned in the range of the target water feeding flow by the first water pump 6;
the controller 1 compares the acquired upper air pressure with the target upper air pressure, and converts the difference signal into a control signal to control the valve opening of the first electric regulating valve, so that the upper air pressure is changed, and the upper air pressure is located in the target upper air pressure range.
Fig. 10 shows a structure of the vibrator of the present invention, and the vibrator 1000 of the present invention is different from the conventional vibrator in that an electromagnetic sensor 1311 and a support rod 1312 for fixing the electromagnetic sensor 1311 are installed in the vibrator, and the support rod 1312 is fixed to a housing of the motor 1304 through a through hole for supporting a bearing housing of the shaft 1306. The vibroflotation device 13 shown in fig. 10 further comprises a hanger 1301, a water pipe 1302, a cable 1303, a motor 1304, a coupling 1305, a shaft 1306, an eccentric weight 1307, a housing 1308, fins 1309, a water down pipe 1310, and an electromagnetic sensor 1311.
The vibroflotation device 13 begins to encrypt the crushed stone filler by powering up the motor 1304. The filler in the encrypted section is extruded into the original stratum along the horizontal direction under the action of the exciting force of the vibroflotation device, the filler at the upper part falls down in slurry under the action of dead weight, and the height of the filler can be measured in real time. As the encryption process proceeds, several phenomena occur:
first, the encryption current gradually increases;
secondly, the exciting force at the shell of the vibroflotation device is increased;
thirdly, the amplitude of the vibroflotation device is reduced;
fourthly, the packing around the vibroflotation device is gradually compacted, and the vibroflotation gravel pile body which is approximately circumference-shaped and has the highest compactness in the vibration receiving range around the vibroflotation device and basically equivalent to the lateral pressure provided by the original stratum when reaching the periphery of the pile hole is gradually formed.
The prior art mainly controls the encryption of the crushed stone filler according to the encryption current of the motor 1304, but has the following four problems:
first, there is no direct relationship between physical and engineering implications and compactness. The encryption current is required to be determined through a test, and the compactness data of the pile body can be obtained approximately after the test. However, when the depth of the vibroflotation gravel pile reaches more than 70m and even reaches the level of hundred meters, the compactness data of the pile body cannot be obtained through a traditional test under the depth, so that the encryption current cannot be determined through experiments;
Secondly, different types of vibroflotation devices with different powers have different currents in different stratum;
thirdly, from engineering practice, even though the vibroflotation devices are of the same manufacturer and model, the idle current of the vibroflotation devices is greatly different;
fourth, in colder areas, the idle current is larger when the vibroflotation device is used initially; and as the engineering expands, the temperature of the vibroflotation device per se increases, and the no-load current decreases.
Therefore, the pile compactness under the ultra-deep overburden condition cannot be represented by taking the encryption current as the compactness.
In order to solve the above problems in the prior art, the present invention proposes a technique for controlling the vibroflotation encryption (i.e., vibroflotation of the crushed stone filler) of the vibroflotation device according to the frequency of the vibration signal of the vibroflotation device when the vibroflotation device vibroflotates the crushed stone filler. The core technology of the vibroflotation encryption technology is as follows:
during the vibration punching encryption of the surrounding crushed stone filler by the vibration punching device, an electromagnetic sensor arranged in the vibration punching device generates a real-time electromagnetic induction signal corresponding to the vibration amplitude of the vibration punching device;
controlling vibration and impact encryption of the vibration and impact device according to the real-time electromagnetic induction signals generated by the electromagnetic sensor arranged in the vibration and impact device, so that the pile diameter of the crushed stone pile formed by the crushed stone filled in the crushed stone pile hole is equal to the effective pile diameter
Fig. 11a shows an example of an electromagnetic sensor 1311 provided in a vibrator according to the present invention, as shown in fig. 11a, the electromagnetic sensor 1311 includes:
a support bar 1312 having one end mounted to the housing of the vibroflotation motor 1304;
a coiled tube 1314 mounted to the other end of the support rod 1312;
a magnetic core 1313 having one end mounted to the inside of the vibrator housing 1308, the other end of the magnetic core 1313 extending into the helical tube 1314;
wherein the magnetic core 1313 moves within the solenoid 1314 as the vibrator housing 1308 vibrates, thereby causing the solenoid 1314 to acquire an electromagnetic induction signal having an amplitude corresponding to the amplitude of the vibrator housing 1308 vibration.
Fig. 11b shows another example of the electromagnetic sensor 1311 provided in a vibrator according to the present invention, as shown in fig. 11b, the electromagnetic sensor 1311 includes:
a support bar 1312 having one end mounted to the housing of the vibroflotation motor 1304;
a solenoid 1314 mounted to the inside of the vibroflotation housing 1308,
a core 1313 mounted on the other end of the support bar 1312, the core 1313 extending into the solenoid 1314;
wherein solenoid 1314 moves relative to magnetic core 1313 as vibroflotator housing 1308 vibrates, thereby causing solenoid 1314 to acquire an electromagnetic induction signal having an amplitude corresponding to the amplitude of the vibroflotator housing 1308 vibration.
Fig. 12 shows a control section for controlling vibroflotation of a vibroflotation filler to carry out vibroflotation encryption control, which includes an electromagnetic sensor 1311 for generating an electromagnetic induction signal corresponding to the amplitude of the vibroflotation filler, an amplifier for amplifying the electromagnetic induction signal outputted from the electromagnetic sensor 1311, an analog-to-digital converter for analog-to-digital converting the electromagnetic induction signal outputted from the amplifier, a processor for processing the output of the analog-to-digital converter, a memory for storing data outputted from the processor, and a display for displaying data outputted from the processor.
The processor is further connected to a main hoisting device to lift the vibroflotation device 13 upwards when it is determined that the diameter of the gravel pile to be formed is equal to the effective pile diameter.
The amplifier, analog-to-digital converter, processor, memory and display of the present invention may be located on the ground, and the amplifier may be connected to the electromagnetic sensor 1311 by a cable.
It should be noted that the processor of the present invention compares and analyzes the "amplitude of electromagnetic induction signal" according to the "absolute value of the amplitude of electromagnetic induction signal".
The present invention can greatly extend the useful life of electromagnetic sensors relative to the inventor's other patent application for pressure sensors mounted on the housing of the vibroflotation device. That is, since the electromagnetic sensor 1311 is installed in the vibrator housing, it is not pressed by the crushed stone packing and the vibrator like the pressure sensor installed in the vibrator housing, and thus is not easily damaged.
Fig. 13 shows a control flow of the first embodiment of controlling the vibroflotation device to perform vibration encryption control, which is mainly implemented by a processor, and specifically includes:
step S301, during the vibration punching encryption of the broken stone filler by the vibration punching device, an electromagnetic sensor arranged in the vibration punching device generates a real-time electromagnetic induction signal corresponding to the vibration of the vibration punching device shell;
step S302, obtaining the amplitude of the real-time electromagnetic induction signal by carrying out analog-to-digital conversion on the real-time electromagnetic induction signal;
step S303, judging whether the amplitude of the real-time electromagnetic induction signal is smaller than or equal to a preset amplitude;
step S304, when the judgment result of the step S302 is yes, judging that the pile diameter of the gravel pile to be formed is equal to the effective pile diameter;
step S305, lifting the vibroflotator upwards, and vibroflotating broken stone in the middle part of the vibroflotation broken stone pile to be formed, so that the broken stone pile with the pile diameter equal to the effective pile diameter is finally formed;
and step S306, when the judgment result of the step S302 is negative, controlling the vibroflotator to continuously vibroflotate the gravels embedded in the soil layer around the gravel pile hole.
Fig. 14 shows a control flow of a second embodiment of controlling a vibroflotation device to perform vibration encryption control, including:
step S401, during the vibration punching encryption of the broken stone filler by the vibration punching device, generating a real-time electromagnetic induction signal corresponding to the vibration amplitude of the vibration punching device shell by an electromagnetic sensor arranged in the vibration punching device;
Step S402, obtaining the amplitude of the front electromagnetic induction signal and the amplitude of the rear electromagnetic induction signal by carrying out analog-to-digital conversion on the real-time electromagnetic induction signal;
step S403, judging whether the amplitude of the subsequent electromagnetic induction signal is smaller than or equal to the amplitude of the preceding electromagnetic induction signal;
step S404, if the judgment result of step S403 is yes, further judging whether the amplitude of the subsequent electromagnetic induction signal is kept unchanged in a period of time;
step S405, if the judgment result of the step S404 is yes, judging that the pile diameter of the gravel pile to be formed is larger than or equal to the effective pile diameter;
step S405, lifting the vibroflotator upwards, and vibroflotating broken stone in the middle part of the vibroflotation broken stone pile to be formed, so as to finally form the broken stone pile with the pile diameter being greater than or equal to the effective pile diameter;
step S406, if the judgment result of step S403 or step S404 is no, controlling the vibroflotation device to continuously vibroflotate the gravels embedded in the soil layer around the gravel pile hole.
It should be pointed out that one of the characteristics of the invention is to provide a concept of effective pile diameter, namely the pile diameter of the gravel pile which is formed in the gravel pile hole, is tightly combined with soil layers around the hole and meets the vibroflotation encryption requirement.
The effective pile diameter of the gravel pile solves the technical problem that the gravel pile possibly existing in the prior art cannot be tightly combined with a soil layer.
Although the present invention has been described in detail, the present invention is not limited thereto, and those skilled in the art can make modifications according to the principles of the present invention, and thus, all modifications made according to the principles of the present invention should be construed as falling within the scope of the present invention.
Claims (10)
1. An vibroflotation method capable of ensuring effective pile diameter of gravel pile is characterized by comprising the following steps:
the vibroflotation construction of the broken stone pile hole is rapidly completed by controlling the water-gas linkage of the vibroflotation broken stone pile machine comprising the telescopic guide rod and the vibroflotation device;
placing the gravel filler into the gravel pile hole, and enabling the vibroflotation device to vibroflotate and encrypt the surrounding gravel filler;
during the vibration punching encryption of the surrounding crushed stone filler by the vibration punching device, an electromagnetic sensor arranged in the vibration punching device generates a real-time electromagnetic induction signal corresponding to the vibration amplitude of the vibration punching device;
and controlling the vibroflotation encryption of the vibroflotation device according to the real-time electromagnetic induction signals generated by the electromagnetic sensor arranged in the vibroflotation device, so that the pile diameter of the gravel pile formed by the gravels filled in the gravel pile holes is equal to the effective pile diameter.
2. The vibroflotation method of claim 1, wherein the electromagnetic sensor disposed within the vibroflotation device comprises:
a support bar with one end mounted to the housing of the vibroflotation motor;
a spiral pipe installed at the other end of the supporting rod;
one end of the magnetic core is arranged on the inner side of the vibrator shell, and the other end of the magnetic core extends into the spiral pipe;
wherein the magnetic core moves in the solenoid along with the vibration of the vibroflotator shell, so that the solenoid obtains an electromagnetic induction signal with the amplitude corresponding to the vibration amplitude of the vibroflotator shell.
3. The vibroflotation method of claim 1, wherein the electromagnetic sensor disposed within the vibroflotation device comprises:
a support bar with one end mounted to the housing of the vibroflotation motor;
a spiral tube mounted to the inside of the vibroflotation housing,
a magnetic core mounted on the other end of the support rod, the magnetic core extending into the spiral tube;
the solenoid tube moves relative to the magnetic core along with the vibration of the vibrator shell, so that the solenoid obtains an electromagnetic induction signal with the amplitude corresponding to the vibration amplitude of the vibrator shell.
4. A vibroflotation method according to claim 2 or 3, characterized in that controlling the vibroflotation encryption of the vibroflotation device according to the real-time electromagnetic induction signal generated by an electromagnetic sensor arranged in the vibroflotation device comprises:
Comparing the amplitude of the real-time electromagnetic induction signal with a preset amplitude;
when the amplitude of the electromagnetic induction signal is smaller than or equal to a preset amplitude, judging that the pile diameter of the gravel pile to be formed is equal to the effective pile diameter, and lifting the vibroflotation device upwards to vibroflotate the broken stone in the middle part of the gravel pile to be formed, so that the gravel pile with the pile diameter equal to the effective pile diameter is finally formed;
when the amplitude of the electromagnetic induction signal is larger than the preset amplitude, controlling the vibroflotation device to continuously vibroflotate the gravels embedded in the soil layer around the gravel pile hole.
5. The vibroflotation method of claim 4 wherein the predetermined amplitude is an amplitude at which a previously obtained vibrator amplitude is reduced to a minimum.
6. A vibroflotation method according to claim 2 or 3, characterized in that controlling the vibroflotation encryption of the vibroflotation device according to the real-time electromagnetic induction signal generated by an electromagnetic sensor arranged in the vibroflotation device comprises:
analyzing the amplitude of the front electromagnetic induction signal and the amplitude of the rear electromagnetic induction signal obtained by the electromagnetic sensor in the vibroflotation period;
when the amplitude of the rear electromagnetic induction signal is smaller than that of the front electromagnetic induction signal and is kept for a period of time, judging that the pile diameter of the gravel pile to be formed is equal to the effective pile diameter, and lifting the vibroflotation device upwards to vibroflotate broken stones in the middle part of the vibroflotation gravel pile to be formed, so that the gravel pile with the pile diameter equal to the effective pile diameter is finally formed.
7. The vibroflotation method of claim 1, wherein the rapid completion of vibroflotation construction of the gravel pile hole by controlling water-gas linkage of the vibroflotation gravel pile machine comprising the telescopic guide rod and the vibroflotation device comprises:
controlling the discharge flow of the supplied sewage according to the current stratum compactness obtained in the vibroflotation construction process; and
controlling the down-gas pressure of the supplied down-gas according to the current stratum compactness obtained in the vibroflotation construction process;
the vibroflotation device completes vibroflotation construction of the broken stone pile hole under the synergistic effect of the drainage and the air supply by controlling the drainage flow of the drainage supplied by the vibroflotation broken stone pile machine and the air supply pressure of the drainage.
8. The vibroflotation method of claim 7, wherein obtaining the current formation compaction during vibroflotation comprises:
acquiring the current vibroflotation current of a vibroflotation device;
searching the formation compactness corresponding to the current vibroflotation current according to the preset corresponding relation between the vibroflotation current and the formation compactness;
and determining the found formation compactness as the current formation compactness.
9. The vibroflotation method of claim 8, wherein controlling the flow of the offal water supplied according to the current formation compaction obtained during the vibroflotation operation comprises:
Acquiring the current sewage pressure of the supplied sewage;
searching a target launching pressure corresponding to the current formation compactness according to the corresponding relation between the preset launching pressure and the formation compactness;
and controlling the flow rate of the sewage supplied by the second water pump by comparing the current sewage pressure with the target sewage pressure, so that the current sewage pressure is positioned in the target sewage pressure range.
10. The vibroflotation method of claim 9, wherein the obtaining the current sewage pressure of the supply sewage comprises:
acquiring a plurality of instantaneous downwater pressures of the supplied downwater;
the instantaneous water pressure is subjected to average treatment to obtain average water pressure;
the resulting average downwater pressure is determined as the current downwater pressure.
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| CN202210255830.3A CN116791575A (en) | 2022-03-15 | 2022-03-15 | Vibroflotation method capable of ensuring effective pile diameter of gravel pile |
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