Water-air linkage control method for a vibroflotation stone pile machine

Abstract

The application discloses a water-gas linkage control method of a vibroflotation stone pile machine, which comprises the following steps: in the process of vibration and percussion, the internal upper water pressure of the telescopic guide rod of the vibroflotation stone pile machine is always controlled to be greater than the external mud pressure, so as to prevent the external mud from entering the telescopic guide rod through the gap; meanwhile, the upper water flow of the supplied upper water and the upper gas pressure of the supplied upper gas are controlled, so as to remove a small amount of sand and stone in the telescopic guide rod under the cooperation of the upper water and the upper gas; the lower water flow of the supplied lower water and the lower gas pressure of the supplied lower gas are controlled according to the current stratum compactness obtained in the process of vibration and percussion; and the vibrator is controlled to complete the vibration and percussion construction under the cooperation of the lower water and the lower gas by controlling the lower water flow of the supplied lower water and the lower gas pressure of the supplied lower gas. According to the application, the lower water and the lower gas are accurately controlled according to different stratum compactness, and the upper water and the upper gas are controlled, so that the vibration and percussion construction of the stratum with a deep overburden layer with a depth of more than 50 m is smoothly carried out, the failure rate is reduced, and the economic loss is reduced.

Description

Technical Field

[0001] This invention relates to the field of vibratory stone crushing piles, and more particularly to a water-air linkage control method for vibratory stone crushing pile machines. Background Technology

[0002] Vibro-compaction is a method of foundation treatment that uses horizontal vibration of a vibro-compactor and the combined action of high-pressure water or high-pressure air to compact loose foundation soil layers; or, after drilling holes in the foundation soil layers, backfilling with stable, hard, coarse-grained materials, and then forming a reinforced structure (vibro-compacted pile) through vibration compaction, which together with the surrounding foundation soil forms a composite foundation.

[0003] When encountering special strata with high undisturbed soil hardness and complex soil composition during vibratory compaction, and the construction effect cannot be guaranteed even with the combined action of horizontal vibration of the vibratory compactor and high-pressure water, high-pressure air can be used as an auxiliary method. The combined action of high-pressure water and high-pressure air can be used to pre-damage the strata by perforation, which is beneficial to improving the penetration and hole-making capabilities of the vibratory compactor.

[0004] The "Technical Specification for Vibro-Compaction Foundation Treatment in Hydropower and Water Conservancy Projects" (DL / T524-2016) stipulates that a water pump is used to pressurize water in a water storage facility and deliver it to the vibro-compactor. Depending on construction needs, multi-stage or single-stage pumps can be selected, prioritizing the required construction water pressure and volume. Generally, a pump with a supply pressure of 0.3MPa to 1.0MPa and a supply volume not less than 15m³ / h (250L / min) is suitable.

[0005] The above regulations are merely a summary of experience based on engineering practice (current domestic vibro-compaction stone pile construction levels are within 35m, and all are shallow-hole vibro-compaction with relatively simple strata). Furthermore, they only provide a general range for water pump pressure and flow rate, without specifying the appropriate water pressure for different strata or for air supply. For overburden layers exceeding 50m, there are often weak interlayers (such as lacustrine sedimentary silty clay) and relatively dense hard layers (such as sand layers or sand layers interbedded with gravel). The problems encountered in drilling these two types of strata are completely different. Therefore, the above regulations are no longer applicable to overburden layers exceeding 50m.

[0006] The invention patent with announcement number CN104372788A provides a detailed description of a vibro-compaction stone-breaking pile machine and construction method applicable to strata with deep overburden layers of over 50m or more. However, the patent does not disclose the appropriate water and gas supply methods for different strata. If the water and gas supply is not compatible with the strata conditions, it can lead to resource waste or, in severe cases, failure of the vibro-compaction construction, requiring rework. The economic losses caused by reworking deep-hole vibro-compaction are substantial. Summary of the Invention

[0007] The purpose of this invention is to overcome the problems existing in the prior art and provide a water-air linkage control method for vibratory compaction stone pile machines. This method precisely controls the water and air supply according to different strata densities, as well as the water and air supply, so that vibratory compaction construction in strata with a thickness of more than 50m can be carried out smoothly, reducing the failure rate and minimizing economic losses.

[0008] To achieve the above-mentioned objectives of this invention, the following technical solutions are provided:

[0009] A water-air linkage control method for a vibratory stone crushing pile machine, the vibratory stone crushing pile machine including a telescopic guide rod and a vibratory compactor, comprising:

[0010] The pipes for supplying water and gas extend from the top of the telescopic guide rod to the bottom of the telescopic guide rod, so that the water and gas flow from bottom to top inside the telescopic guide rod under the action of the baffle at the bottom of the telescopic guide rod, and flow out from the top of the telescopic guide rod.

[0011] The pipe for supplying sewage passes through the telescopic guide rod and the vibratory flusher and extends from the bottom of the vibratory flusher so that the sewage is sprayed out from the bottom of the vibratory flusher to pre-damage the formation with water; the pipe for supplying air passes through the telescopic guide rod and extends from the side wall of the bottom sleeve of the telescopic guide rod so that the air is sprayed out from the bottom of the telescopic guide rod to pre-damage the formation with air.

[0012] During vibro-compaction construction, the water pressure inside the telescopic guide rod must always be greater than the external mud pressure to prevent external mud from entering the telescopic guide rod through the gaps.

[0013] Control the water supply flow rate and the air supply pressure to remove small amounts of sand and gravel that have entered the telescopic guide rod through the combined action of water and air supply.

[0014] The flow rate of the supplied groundwater is controlled based on the current formation density obtained during the vibro-compaction process; and

[0015] The gas pressure supplied to the ground is controlled based on the current formation density obtained during the vibro-compaction process.

[0016] By controlling the flow rate of the supplied water and the pressure of the supplied air, the vibratory compactor can complete the vibratory compaction operation under the combined action of the water and air.

[0017] Preferably, obtaining the current formation density during vibro-compaction construction includes: obtaining the current vibro-compaction current of the vibro-compaction device; finding the formation density corresponding to the current vibro-compaction current based on the preset correspondence between the vibro-compaction current and the formation density; and determining the found formation density as the current formation density.

[0018] Preferably, controlling the flow rate of the supplied water based on the current ground compaction obtained during the vibro-compaction process includes: obtaining the current water pressure; finding the target water pressure corresponding to the current ground compaction based on a preset correspondence between water pressure and ground compaction; and controlling the flow rate of the water supplied by the second pump by comparing the current water pressure and the target water pressure, so that the current water pressure is within the target water pressure range.

[0019] Preferably, obtaining the current drainage pressure of the supplied drainage includes: obtaining multiple instantaneous drainage pressures of the supplied drainage; averaging the multiple instantaneous drainage pressures to obtain an average drainage pressure; and determining the obtained average drainage pressure as the current drainage pressure.

[0020] Preferably, controlling the flow rate of the second water pump by comparing the current drainage pressure and the target drainage pressure includes: controlling the second water pump to reduce the drainage flow rate when the current drainage pressure is greater than the upper limit of the target drainage pressure; controlling the second water pump to increase the drainage flow rate when the current drainage pressure is less than the lower limit of the target drainage pressure; and controlling the second water pump to maintain the drainage flow rate when the current drainage pressure is within the range of the target drainage pressure.

[0021] Preferably, controlling the supply air pressure based on the current formation density obtained during vibro-compaction includes: obtaining the supply air pressure; finding the target air pressure corresponding to the current formation density based on a preset correspondence between air pressure and formation density; and controlling the supply air pressure of the second air compressor by comparing the obtained air pressure and the target air pressure, so that the obtained air pressure is within the target air pressure range.

[0022] Preferably, controlling the water supply flow rate includes: acquiring the current water supply flow rate; and controlling the current water supply flow rate to be within the target water supply flow rate range by comparing the current water supply flow rate with the target water supply flow rate; wherein, controlling the air supply pressure includes: acquiring the air supply pressure; and controlling the air supply pressure of the first air compressor to be within the target air supply pressure range by comparing the acquired air supply pressure with the target air supply pressure.

[0023] Preferably, obtaining the current water supply flow rate includes: obtaining multiple instantaneous water supply flow rates; averaging the multiple instantaneous water supply flow rates to obtain an average water supply flow rate; and determining the obtained average water supply flow rate as the current water supply flow rate.

[0024] Preferably, obtaining the current pulse current of the vibrator includes: real-time detection of the pulse current of the vibrator; and determining the detected pulse current as the current pulse current.

[0025] The vibratory compaction construction includes vibratory hole making and vibratory densification.

[0026] The beneficial effects of this invention are reflected in the following aspects:

[0027] 1) For complex strata with deep overburden, when the effect of supplying water alone is not obvious, this invention precisely controls the supply of water pressure and air pressure according to different strata density, so that the vibratory compactor can successfully complete the deep hole vibratory compaction construction of complex strata under the synergistic effect of appropriate water pressure and air pressure, thereby solving the problem of vibratory compaction construction of strata with overburden of more than 50m.

[0028] 2) This invention achieves a constant internal water pressure greater than the external mud pressure by precisely controlling the water pressure, thus preventing external mud from entering the telescopic guide rod through the gaps. Furthermore, by controlling the current water flow rate and the air pressure within the target range during vibro-compaction, a small amount of sand and gravel that may have entered the telescopic guide rod is removed. This allows the telescopic guide rod to freely extend and retract under the influence of water and air, ensuring reliable deep-hole vibro-compaction in complex formations based on the telescopic guide rod. Attached Figure Description

[0029] Figure 1 This is a schematic block diagram of the water-air linkage control system of the vibratory stone crushing pile machine of the present invention;

[0030] Figure 2 This is a flowchart of a method for obtaining the current formation density according to an embodiment of the present invention;

[0031] Figure 3 This is a flowchart of the control method for water supply, air supply, and water and air drainage according to an embodiment of the present invention;

[0032] Figure 4 This is a flowchart of a method for controlling the flow rate of supplied groundwater based on the current ground compaction obtained during vibro-compaction construction, according to an embodiment of the present invention.

[0033] Figure 5 This is a flowchart of a method for controlling the supply pressure of gas based on the current formation density obtained during vibro-compaction construction, according to an embodiment of the present invention.

[0034] Figure 6 This is a flowchart of a method for controlling the water supply flow rate according to an embodiment of the present invention;

[0035] Figure 7 This is a flowchart of a method for controlling the supply pressure of gas according to an embodiment of the present invention. Detailed Implementation

[0036] In deep-hole vibratory compaction of stone piles, the vibratory compaction machine utilizes an adjustable-length telescopic guide rod to adapt to different hole depths. Patent CN104372788A provides a detailed description of this telescopic guide rod-based vibratory compaction machine. The machine includes a telescopic guide rod and a vibratory compactor. Water is ejected from the bottom of the vibratory compactor to pre-damage the ground, while air is ejected from the bottom of the telescopic guide rod to assist in this pre-damage. The vibratory compactor, along with the water and air, works together to complete the vibratory compaction. Water, aided by a baffle at the bottom of the telescopic guide rod, forms an upward-flowing water flow within the rod, while air, also aided by the baffle, forms an upward-flowing airflow. This helps the water carry away sand and gravel entering the guide rod, preventing sand buildup and blockage. The combined action of the water and air allows the telescopic guide rod to extend and retract freely.

[0037] Based on the above-mentioned vibratory compaction stone pile machine, the present invention provides a water-air linkage control method for the vibratory compaction stone pile machine, comprising: during the vibratory compaction construction process, real-time control of the water supply flow rate and the air supply pressure, so that the telescopic guide rod can freely extend and retract under the combined action of the water and air; obtaining the current ground compaction during the vibratory compaction construction process; and based on the current ground compaction, real-time control of the ground water supply flow rate and the ground air supply pressure, so that the vibratory compactor and the ground water and air work together to complete the vibratory compaction construction.

[0038] This invention is applicable to deep-hole vibro-compaction in complex formations. By automatically controlling the water and air supply during vibro-compaction construction and automatically controlling the water and air supply based on the current formation density, the smooth progress of deep-hole vibro-compaction construction is ensured.

[0039] The vibratory compaction construction described in this invention includes vibratory hole making and vibratory densification.

[0040] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0041] like Figure 3 As shown, this embodiment provides a water-air linkage control method for a vibratory stone crushing pile machine, including:

[0042] S100, the pipes for supplying water and gas extend from the top of the telescopic guide rod to the bottom of the telescopic guide rod, so that the water and gas are formed from bottom to top inside the telescopic guide rod under the action of the baffle at the bottom of the telescopic guide rod, and flow out from the top of the telescopic guide rod;

[0043] S101, the pipe for supplying sewage passes through the telescopic guide rod and the vibratory flusher and extends from the bottom of the vibratory flusher so that the sewage is sprayed out from the bottom of the vibratory flusher to pre-damage the formation with water.

[0044] S102, the pipe for supplying the gas passes through the telescopic guide rod and extends from the side wall of the bottom sleeve of the telescopic guide rod so that the gas is ejected from the bottom of the telescopic guide rod to perform gas-blast pre-damage to the formation.

[0045] S103, during vibro-compaction construction, the water pressure inside the telescopic guide rod must always be greater than the external mud pressure to prevent external mud from entering the telescopic guide rod through the gaps; simultaneously

[0046] S104 controls the water supply flow rate and the air supply pressure to remove small amounts of sand and gravel that have entered the telescopic guide rod under the combined action of water and air supply.

[0047] S105, the flow rate of the supplied groundwater is controlled based on the current ground compaction obtained during the vibro-compaction process; and

[0048] S106, the gas pressure supplied to the ground is controlled based on the current formation density obtained during the vibro-compaction process;

[0049] S107, by controlling the flow rate of the supplied water and the pressure of the supplied air, enables the vibratory compactor to complete the vibratory compaction operation under the synergistic action of the water and air.

[0050] The drainage control method of this embodiment will be described in detail below with reference to the accompanying drawings.

[0051] like Figure 2 As shown, obtaining the current formation density during vibro-compaction includes:

[0052] S201, obtain the current oscillation current of the oscillator;

[0053] S202, based on the preset relationship between vibratory current and formation density, find the formation density corresponding to the current vibratory current;

[0054] S203, the found formation density is determined as the current formation density.

[0055] like Figure 1 As shown, the vibrator 3 is connected to the controller 1 through the vibrator frequency converter cabinet 2. The vibrator frequency converter cabinet 2 and the controller 1 are connected wirelessly or wiredly.

[0056] In one embodiment of this example, when encountering a locally uniformly distributed stratum, the instantaneous value of the obtained oscillating current is stable. S201 obtains the current oscillating current of the oscillator in the following way: obtains the instantaneous value of the oscillating current of the oscillator; and determines the obtained instantaneous value of the oscillating current as the current oscillating current.

[0057] In this implementation, controller 1 obtains the vibration current signal of vibrator 3 from vibrator inverter cabinet 2 and determines the obtained vibration current as the current vibration current. Alternatively, a current detection sensor (not shown in the figure) is installed on the vibration output line of vibrator 3 connected to vibrator inverter cabinet 2; when vibrator 3 is started, the current detection sensor generates a vibration current signal, which is transmitted to controller 1 in real time via wired or wireless means. Controller 1 determines the vibration current transmitted from the current detection sensor in real time as the current vibration current. The current detection sensor can be any sensor capable of detecting current in the prior art, such as a current transformer.

[0058] In another embodiment of this example, when encountering locally unevenly distributed strata, the instantaneous values ​​of the acquired vibratory current jump significantly. S201 acquires the current vibratory current of the vibrator in the following way: acquire multiple instantaneous values ​​of the vibratory current; average the acquired multiple instantaneous values ​​of the vibratory current to obtain the average vibratory current; and determine the average vibratory current as the current vibratory current. The time interval between acquiring two adjacent instantaneous values ​​of the vibratory current is equal. The method for averaging the acquired multiple instantaneous values ​​of the vibratory current is as follows: n (n≥2) consecutively acquired instantaneous values ​​of the vibratory current are grouped into a queue, and the n instantaneous values ​​of the vibratory current in the queue are summed and averaged; each newly acquired instantaneous value of the vibratory current is added to the tail of the queue, while the first instantaneous value of the vibratory current is removed, forming a new queue, and the n instantaneous values ​​of the vibratory current in the new queue are summed and averaged.

[0059] In specific implementation, the method for obtaining the instantaneous value of the oscillation current is the same as that described in the previous implementation. Specifically, a current averaging module can be set up inside the controller. The controller obtains the instantaneous value of the oscillation current from the oscillator inverter cabinet 2 or the current detection sensor. The current averaging module averages the n (n≥2) instantaneous values ​​of the oscillation current in the queue to obtain the average oscillation current. The controller determines the average oscillation current as the current oscillation current.

[0060] Specifically, S202 searches for the formation density corresponding to the current vibratory current based on a preset correspondence between vibratory current and formation density; and S203 determines the found formation density as the current formation density. The specific implementation method is as follows:

[0061] The controller has a pre-set relationship between vibratory current and soil density. This relationship is obtained through testing; that is, before formal construction, test piles are built on site, and the controller analyzes the large amount of data obtained from the test piles to determine the relationship between vibratory current and soil density.

[0062] In one embodiment of this example, the relationship between vibratory current and formation density is shown in Table 1. Formation density is divided into three levels: soft, medium, and hard. The relationship between different levels of formation density and vibratory current is obtained through field test data.

[0063] Table 1. Correspondence between vibratory current and formation density

[0064] I<0.3Ie soft 0.3Ie≤I<0.8Ie middle I≥0.8Ie hard

[0065] In Table 1, Ie represents the rated current of the vibrator.

[0066] After obtaining the current vibration current, the controller determines the current formation density by looking up Table 1. For example, when the controller 1 obtains the current vibration current I = 0.3Ie, it determines the current formation density as medium by looking up Table 1.

[0067] It should be noted that Table 1 only shows one correspondence between the vibration current and the formation density. For more complex formations, the controller can obtain other more complex correspondences based on field test data.

[0068] S105 controls the flow rate of the supplied groundwater based on the current ground compaction obtained during the vibro-compaction process, such as... Figure 4 As shown, it includes:

[0069] S301, Obtain the current drainage pressure of the supplied drainage;

[0070] S302, based on the preset correspondence between groundwater pressure and formation density, find the target groundwater pressure corresponding to the current formation density;

[0071] S303 controls the flow rate of the second water pump by comparing the current drainage pressure with the target drainage pressure, so that the current drainage pressure is within the target drainage pressure range.

[0072] The controller converts the difference between the current drainage pressure and the target drainage pressure into a control signal, which controls the drainage flow rate supplied by the second water pump to ensure that the current drainage pressure is within the target drainage pressure range.

[0073] This embodiment uses a BW450 plunger pump to supply sewage, but other pumps can also be used, as long as the supplied sewage pressure and flow rate meet the requirements.

[0074] Because plunger pump water supply is characterized by large fluctuations in pulsating pressure and instantaneous flow rate, therefore: S301 obtains the current sewage pressure of the supplied sewage, including:

[0075] S401, obtain multiple instantaneous drainage pressures of the supply drainage;

[0076] S402, average the multiple instantaneous water pressures to obtain the average water pressure;

[0077] S403, the obtained average drainage pressure is determined as the current drainage pressure.

[0078] When S401 acquires multiple instantaneous water pressures from the water supply, the time interval between acquiring two adjacent instantaneous water pressures is equal.

[0079] In one embodiment of this example, S402 averages multiple instantaneous water pressures to obtain an average water pressure. The specific implementation is as follows: n (n≥2) consecutively acquired instantaneous water pressures are formed into a sampling interval, and the n instantaneous water pressures within the sampling interval are added together and the arithmetic mean is taken.

[0080] In another embodiment of this example, S402 averages multiple instantaneous water pressures to obtain an average water pressure. The specific implementation is as follows: n (n≥2) consecutively acquired instantaneous water pressures are formed into a sampling interval, and the root mean square of the n instantaneous water pressures within the sampling interval is calculated.

[0081] In the two aforementioned embodiments, the n instantaneous water pressures in the previous sampling interval do not overlap with the n instantaneous water pressures in the next sampling interval. For example, the first sampling interval includes the 1st and 2nd instantaneous water pressures, the second sampling interval includes the 3rd and 4th instantaneous water pressures, and so on.

[0082] In specific implementation, the above two implementation methods, such as Figure 1 As shown, a second water supply pressure sensor 41 and a second water supply flow rate sensor 42 are installed on the outlet pipe of the second water pump 4 to detect the instantaneous water pressure and instantaneous water flow rate supplied by the second water pump 4 in real time. The second water supply pressure sensor 41 and the second water supply flow rate sensor 42 can be any sensor capable of detecting water pressure and flow rate in the prior art. For example, the second water supply pressure sensor 41 can be a pressure transmitter, and the second water supply flow rate sensor 42 can be an electromagnetic flow meter.

[0083] A pressure signal averaging circuit is added inside the second water supply pressure detection sensor 41 to average the n instantaneous water pressures continuously detected by the second water supply pressure detection sensor 41 to obtain the average water pressure. The controller 1 collects the average water pressure and determines the average water pressure as the current water pressure.

[0084] In addition, a flow signal averaging circuit is added inside the second water supply flow detection sensor 42 to obtain the average flow rate by averaging the flow rates of n consecutive instantaneous water flows. The controller 1 determines the collected average flow rate as the current flow rate.

[0085] like Figure 1 As shown, the second water supply pressure detection sensor 41 and the second water supply flow detection sensor 42 transmit the average water pressure signal and the average water flow signal to the remote terminal unit (RTU), and the RTU transmits the signal to the controller 1 wirelessly.

[0086] Alternatively, a pressure signal averaging module and a flow signal averaging module can be added inside the controller. The controller averages the n instantaneous water pressures transmitted from the second water supply pressure detection sensor 41 and the n instantaneous water flow rates transmitted from the second water supply flow detection sensor 42 to obtain the average water pressure and average water flow rate respectively. The average water pressure is then determined as the current water pressure, and the average water flow rate is determined as the current water flow rate.

[0087] Specifically, S302, based on the preset correspondence between groundwater pressure and formation density, finds the target groundwater pressure corresponding to the current formation density. The specific implementation method is as follows:

[0088] The controller has a pre-set relationship between water pressure and soil density. This relationship is obtained through testing; that is, test piles are built on-site before formal construction, and the controller analyzes the large amount of data obtained from the test piles to determine the relationship between water pressure and soil density.

[0089] In one embodiment of this example, the relationship between groundwater pressure and formation density is shown in Table 2. Formation density is divided into three levels: soft, medium, and hard. The relationship between different levels of formation density and groundwater pressure is obtained through field test data.

[0090] Table 2. Correspondence between groundwater pressure and formation density

[0091] 0.3～0.5 soft 0.5～0.7 middle 0.7～0.8 hard

[0092] Controller 1 uses lookup table 2 to find the target groundwater pressure corresponding to the current formation density. As shown in Table 2, upper and lower limits are set for the groundwater pressure corresponding to each level of formation density. For example, when controller 1 determines the current formation density to be medium using lookup table 1, it uses lookup table 2 to find the target groundwater pressure corresponding to the medium-level current formation density, which is 0.5–0.7 MPa.

[0093] It should be noted that Table 2 only shows one relationship between groundwater pressure and formation density. For more complex formations, the controller can obtain other more complex relationships based on field test data.

[0094] Specifically, S303 controls the flow rate of the second water pump by comparing the current drainage pressure with the target drainage pressure, so that the current drainage pressure is within the target drainage pressure range. This includes: when the current drainage pressure is greater than the upper limit of the target drainage pressure, controlling the second water pump 4 to reduce the drainage flow rate; when the current drainage pressure is less than the lower limit of the target drainage pressure, controlling the second water pump 4 to increase the drainage flow rate; and when the current drainage pressure is within the target drainage pressure range, controlling the second water pump 4 to maintain the drainage flow rate.

[0095] like Figure 1 As shown, in this embodiment, the second water pump 4 is connected to the controller 1 via the second water pump frequency converter cabinet 5. The second water pump frequency converter cabinet 5 and the controller 1 are connected wirelessly, but a wired connection can also be used. The controller 1 controls the rotational speed of the second water pump 4 by changing the output frequency of the second water pump frequency converter cabinet 5, thereby changing the flow rate of the sewage supplied by the second water pump 4. When the flow rate of the sewage discharged from the outlet pipe of the second water pump increases, the sewage pressure also increases; when the flow rate of the sewage discharged from the outlet pipe of the second water pump decreases, the sewage pressure also decreases.

[0096] If the construction effect is not obvious when only water is supplied during vibro-compaction construction, air supply should be provided as an auxiliary measure.

[0097] The air control method of this embodiment will be described in detail below with reference to the accompanying drawings.

[0098] Among them, S106 controls the gas pressure supplied to the ground based on the current formation density obtained during the vibro-compaction process, such as... Figure 5 As shown, it includes:

[0099] S501, obtain the pressure of the supplied gas;

[0100] S502, based on the preset correspondence between ground pressure and formation density, find the target ground pressure corresponding to the current formation density;

[0101] S503 controls the lower air pressure supplied by the second air compressor by comparing the acquired lower air pressure with the target lower air pressure, so that the acquired lower air pressure is within the target lower air pressure range.

[0102] The controller converts the difference between the acquired down-pressure and the target down-pressure into a control signal, controlling the down-pressure supplied by the second air compressor to be within the target down-pressure range.

[0103] In this embodiment, the current formation density is obtained by referring to the aforementioned groundwater control method.

[0104] In this embodiment, S501, obtaining the supply air pressure specifically includes: real-time detection of the instantaneous supply air pressure of the second air compressor, and obtaining instantaneous supply air pressures at equal intervals.

[0105] In one embodiment of this example, the method for obtaining the lower air pressure is as follows:

[0106] like Figure 1 As shown, an air receiver tank is installed at the outlet of the second air compressor 8, and a second air supply pressure detection sensor 81 is installed on the air outlet pipe of the air receiver tank to detect the instantaneous air pressure supplied by the second air compressor 8. The second air supply pressure detection sensor 81 can be any sensor capable of detecting air pressure in the prior art. For example, a pressure transmitter can be used.

[0107] In addition, a second air supply flow detection sensor 82 is installed on the outlet pipe of the air tank of the second air compressor 8 to detect the flow rate of the air supplied by the second air compressor 8. The second air supply flow detection sensor 82 can be any sensor capable of detecting airflow in the prior art. For example, a vortex flow meter can be used.

[0108] The second air supply pressure detection sensor 81 and the second air supply flow detection sensor 82 transmit the detected pressure and flow signals to the remote terminal unit (RTU), which then transmits the signals wirelessly to the controller 1.

[0109] Specifically, S502 finds the target ground pressure corresponding to the current formation density based on the preset correspondence between ground pressure and formation density. The specific implementation method is as follows:

[0110] The controller has a pre-set relationship between air pressure and formation density. This relationship is obtained through testing. Before formal construction, test piles are built on-site, and the controller analyzes the large amount of data obtained from the test piles to determine the relationship between air pressure and formation density.

[0111] In one embodiment of this example, the relationship between ground pressure and formation density is shown in Table 3. Formation density is divided into three levels: soft, medium, and hard. The relationship between different levels of formation density and ground pressure is obtained through field test data.

[0112] Table 3. Correspondence between atmospheric pressure and formation density

[0113] 0 soft 0.3～0.5 middle 0.7～0.8 hard

[0114] Controller 1 uses lookup table 3 to find the target ground pressure corresponding to the current formation density. As shown in Table 3, each level of formation density has upper and lower limits for the ground pressure. For example, when controller 1 determines the current formation density to be medium using lookup table 1, it uses lookup table 3 to find the target ground pressure corresponding to the medium formation density, which is 0.3–0.5 MPa.

[0115] It should be noted that Table 3 only shows one correspondence between air pressure and formation density. For more complex formations, the controller can obtain other more complex correspondences based on field test data.

[0116] Specifically, S503 controls the lower air pressure supplied by the second air compressor by comparing the acquired lower air pressure with the target lower air pressure, ensuring that the acquired lower air pressure is within the target lower air pressure range. This includes:

[0117] When the acquired downdraft pressure is greater than the upper limit of the target downdraft pressure, the second air compressor is controlled to reduce the downdraft pressure; when the acquired downdraft pressure is less than the lower limit of the target downdraft pressure, the second air compressor is controlled to increase the downdraft pressure; when the acquired downdraft pressure is within the range of the target downdraft pressure, the second air compressor is controlled to maintain the downdraft pressure.

[0118] In one embodiment of this example, as Figure 1 As shown, a second electric regulating valve 9 is installed on the gas outlet pipe of the gas storage tank. The gas pressure is controlled by adjusting the opening degree of the second electric regulating valve 9. Figure 1 As shown, in this embodiment, the controller 1 wirelessly transmits the valve opening signal to the remote terminal unit (RTU), which then controls the valve opening of the second electric regulating valve 9. When the second electric regulating valve 9 is fully opened, the downstream air flow rate increases, and the downstream air pressure also increases accordingly; when the second electric regulating valve 9 is partially opened, the downstream air flow rate decreases, and the downstream air pressure also decreases accordingly.

[0119] For complex formations with deep overburden, this embodiment automatically controls the supply of water and air pressure according to different formation densities, thereby cooperating with the vibratory compactor to successfully complete deep hole vibratory compaction.

[0120] Deep hole vibratory compaction based on telescopic guide rods requires the supply of water.

[0121] The water supply control method of this embodiment will be described in detail below with reference to the accompanying drawings.

[0122] The water supply control principle of this embodiment is as follows: 1. Control the water supply pressure: The water supply pressure inside the telescopic guide rod is always greater than the mud pressure in the pile hole, forcing the water inside the telescopic guide rod to flow from the sleeve gap of the telescopic guide rod to the mud in the pile hole, thereby achieving dynamic balance of water pressure inside the pipe and preventing sand and gravel in the mud from entering and getting stuck in the sleeve gap; 2. Control the water supply flow rate: During the process of water flowing upward from the top of the bottom sleeve to the top sleeve and then being discharged, the water supply flow rate inside the telescopic guide rod is kept at a certain level, thereby carrying away any small amount of sand and gravel that may accidentally enter the telescopic guide rod and preventing them from getting stuck in the sleeve gap.

[0123] Based on the above principles, this embodiment, by controlling the water flow rate in real time while ensuring dynamic balance of water pressure inside the pipe, can avoid pipe jamming and achieve the purpose of free extension and retraction of the telescopic guide rod.

[0124] In S103, during the vibro-compaction process, the water pressure inside the telescopic guide rod is always greater than the external mud pressure. The specific implementation method is as follows:

[0125] The internal water pressure of the telescopic guide rod includes the static water pressure (ρ) 水 The pressure of the water supplied by the first water pump (ΔP) and the pressure of the water inside the telescopic guide rod are always greater than the external mud pressure, which controls the static pressure of the water inside the telescopic guide rod (ρ). 水 The sum of the pressure of the water supplied by the first pump (ΔP) and the pressure of the mud slurry in the external pile hole of the telescopic guide rod (ρ) must be greater than the pressure of the mud slurry in the external pile hole of the telescopic guide rod (ρ). 浆 gh), that is, the water pressure supplied by the first water pump (ΔP) is greater than the mud pressure (ρ) inside the pile hole outside the telescopic guide rod. 浆 gh) and the hydrostatic pressure of the water inside the telescopic guide rod (ρ) 水 The difference between gh), i.e., ΔP > ρ 浆 gh-ρ 水 gh.

[0126] Where, ρ 水 =1g / cm 3 , ρ 浆 =1.4g / cm 3 If g≈10m / s, and h=100m, then △P>0.4MPa.

[0127] Based on the above calculations, when the hole depth is 100m, by controlling the water pressure supplied by the first water pump to be greater than 0.4MPa, the dynamic balance of water pressure inside the telescopic guide rod can be maintained, preventing sand and gravel in the mud from entering and getting stuck in the casing gap.

[0128] In practice, the first water pump 6 can be a water pump with a minimum pump pressure greater than 0.4 MPa. For example, a plunger pump BW320 with a minimum pump pressure of 1.5 MPa can be used.

[0129] Specifically, the water pressure inside the telescopic guide rod is always greater than the external mud pressure. That is, the water pressure supplied by the first water pump is controlled in the following way: the current water pressure is obtained; by comparing the current water pressure with the reference water pressure, the water pressure supplied by the first water pump is controlled so that the current water pressure is greater than or equal to the reference water pressure; wherein, the sum of the reference water pressure and the static pressure of the water inside the telescopic guide rod is always greater than the external mud pressure.

[0130] For details on how to obtain the current water pressure, please refer to the section on obtaining the current drainage pressure. When the borehole depth is 100m, the reference water pressure is taken as 0.4MPa.

[0131] Under the condition that the current water pressure is greater than the reference water pressure, this embodiment uses real-time control of the water flow rate to remove a small amount of sand and gravel that may accidentally enter the telescopic guide rod, thus preventing it from getting stuck in the sleeve gap.

[0132] S104 controls the flow rate of the supplied water, such as... Figure 6 As shown, it includes:

[0133] S601, Obtain the current water flow rate supplied by the first water pump;

[0134] S602, by comparing the current water flow rate with the target water flow rate, controls the water flow rate supplied by the first water pump to ensure that the current water flow rate is within the range of the target water flow rate.

[0135] The controller converts the difference between the current water flow rate and the target water flow rate into a control signal, which controls the water flow rate supplied by the first water pump to ensure that the current water flow rate is within the target water flow rate range.

[0136] For a specific implementation method of obtaining the current water flow rate supplied by the first water pump in step S601, please refer to Obtaining the Current Sewage Flow Rate.

[0137] In this embodiment, S602 controls the water supply flow rate of the first water pump by comparing the current water supply flow rate with the target water supply flow rate. Specifically, it includes: when the current water supply flow rate is greater than the upper limit of the target water supply flow rate, controlling the first water pump 6 to reduce the water supply flow rate; when the current water supply flow rate is less than the lower limit of the target water supply flow rate, controlling the first water pump 6 to increase the water supply flow rate; and when the current water supply flow rate is within the range of the target water supply flow rate, controlling the first water pump 6 to maintain the water supply flow rate.

[0138] In one embodiment of this example, the target water flow rate range is set to 280±10 L / min. The maximum flow rate of the plunger pump BW320 (320 L / min) must be greater than the target water flow rate. Alternatively, another first water pump 6 can be selected that simultaneously meets the water pressure and water flow rate supply requirements of this embodiment.

[0139] like Figure 1 As shown, a first water supply pressure detection sensor 61 and a first water supply flow detection sensor 62 are installed on the outlet pipe of the first water pump 6 to detect the instantaneous water supply pressure and instantaneous water supply flow rate supplied by the first water pump 6 in real time. The first water supply pressure detection sensor 61 and the first water supply flow detection sensor 62 can be any sensor capable of detecting water pressure and flow rate in the prior art. For example, the first water supply pressure detection sensor 61 can be a pressure transmitter, and the first water supply flow detection sensor 62 can be an electromagnetic flow meter.

[0140] like Figure 1 As shown, the first water pump 6 is connected to the controller 1 via the first water pump frequency converter cabinet 7. The first water pump frequency converter cabinet 7 and the controller 1 are connected wirelessly or via a wired connection. The controller 1 controls the speed of the first water pump 6 by changing the output frequency of the first water pump frequency converter cabinet 7, thereby changing the water flow rate supplied by the first water pump 6 so that the current water flow rate is within the target water flow rate range.

[0141] In one embodiment of this example, a plunger pump is used to supply water. The method for the controller 1 to obtain the current water flow rate and current water pressure is the same as the method for the controller 1 to obtain the current water flow rate and current water pressure when using a plunger pump to supply water, and will not be repeated here.

[0142] When deep hole vibratory compaction based on telescopic guide rods fails to achieve significant construction results by only supplying water, an auxiliary air supply should be provided.

[0143] The air intake control method of this embodiment will be described in detail below with reference to the accompanying drawings.

[0144] S104 controls the supply pressure of the gas, such as Figure 7 As shown, it includes:

[0145] S701, obtain the air pressure supplied by the first air compressor;

[0146] S702 controls the air pressure supplied by the first air compressor by comparing the acquired air pressure with the target air pressure, so that the acquired air pressure is within the target air pressure range.

[0147] Specifically, S701 acquires the air pressure supplied by the first air compressor, including: real-time detection of the instantaneous air pressure supplied by the first air compressor, and acquisition of instantaneous air pressure at equal intervals.

[0148] In one embodiment of this example, the method for obtaining the upper air pressure is as follows:

[0149] like Figure 1As shown, an air receiver tank is installed at the outlet of the first air compressor, and a first air supply pressure detection sensor is installed on the outlet pipe of the air receiver tank to detect the instantaneous air supply pressure of the first air compressor. The first air supply pressure detection sensor can be any sensor capable of detecting air pressure available in the prior art. For example, a pressure transmitter can be used.

[0150] In addition, a first air supply flow detection sensor is installed on the outlet pipe of the first air compressor's air tank to detect the air supply flow rate of the first air compressor. The first air supply flow detection sensor can be any sensor capable of detecting airflow that is currently available in the technology. For example, a vortex flow meter can be used.

[0151] 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), and the RTU transmits the signal to the controller 1 wirelessly.

[0152] Specifically, S702 controls the supply pressure of the first air compressor by comparing the acquired supply pressure with the target supply pressure, ensuring that the acquired supply pressure is within the target supply pressure range. This includes:

[0153] When the acquired air pressure is greater than the upper limit of the target air pressure, the first air compressor is controlled to reduce the air pressure; when the acquired air pressure is less than the lower limit of the target air pressure, the first air compressor is controlled to increase the air pressure; when the acquired air pressure is within the target air pressure range, the first air compressor is controlled to maintain the air pressure.

[0154] In one embodiment of this example, the target upper air pressure range is set to 0.3 to 0.4 MPa.

[0155] like Figure 1 As shown, a first electric regulating valve is installed on the gas outlet pipe of the gas storage tank. The gas pressure is controlled by adjusting the opening degree of the first electric regulating valve. Figure 1 As shown, in this embodiment, controller 1 wirelessly transmits the valve opening signal to the remote terminal unit (RTU), which then controls the valve opening of the first electric regulating valve. When the first electric regulating valve opens wider, the air flow rate increases, and the air pressure also increases; when the first electric regulating valve opens narrower, the air flow rate decreases, and the air pressure also decreases.

[0156] This embodiment uses an SV-70 vibratory compactor for stone crushing piles. The telescopic guide rod connects to the vibratory compactor, and the water-air linkage automatic control process is as follows:

[0157] 1. After the vibratory impactor 3 is started, the second water supply pressure detection sensor 41 detects the instantaneous water pressure in real time, the second water supply flow detection sensor 42 detects the instantaneous water flow in real time, the second air supply pressure detection sensor 81 detects the instantaneous air pressure in real time, the second air supply flow detection sensor 82 detects the instantaneous air flow in real time, the first water supply pressure detection sensor 61 detects the instantaneous water pressure in real time, the first water supply flow detection sensor 62 detects the instantaneous water flow in real time, the first air supply pressure detection sensor detects the instantaneous air pressure in real time, and the first air supply flow detection sensor detects the instantaneous air flow in real time.

[0158] 2. Controller 1 acquires the current vibration current, current water pressure, current water flow rate, water pressure, water flow rate, current water pressure, current water flow rate, water pressure, and water flow rate;

[0159] 3. Controller 1 determines the current formation density corresponding to the current vibration current based on the obtained current vibration current lookup table 1; determines the target groundwater pressure corresponding to the current formation density through lookup table 2; and determines the target groundwater pressure corresponding to the current formation density through lookup table 3.

[0160] 4. The controller 1 compares the current drainage pressure with the target drainage pressure, converts the difference signal into a control signal to control the output frequency of the second water pump frequency converter cabinet 5, and changes the drainage flow rate supplied by the second water pump 4 by controlling the rotation speed of the second water pump 4, thereby changing the drainage pressure so that the current drainage pressure is within the target drainage pressure range.

[0161] The controller 1 compares the acquired downdraft pressure with the target downdraft pressure, and converts the difference signal into a control signal to control the valve opening of the second electric regulating valve 9, thereby changing the downdraft pressure so that the downdraft pressure is within the target downdraft pressure range.

[0162] The controller 1 compares the current water flow rate with the target water flow rate, converts the difference signal into a control signal to control the output frequency of the first water pump frequency converter cabinet 7, and changes the speed of the first water pump 6 to change the water flow rate supplied by the first water pump 6, so that the current water flow rate is within the target water flow rate range.

[0163] The controller 1 compares the acquired upper air pressure with the target upper air pressure, converts the difference signal into a control signal to control the valve opening of the first electric regulating valve, thereby changing the upper air pressure so that the upper air pressure is within the target upper air pressure range.

[0164] Although the present invention has been described in detail above, the present invention is not limited thereto. Those skilled in the art can make modifications based on the principles of the present invention. Therefore, all modifications made in accordance with the principles of the present invention should be understood as falling within the protection scope of the present invention.

Claims

1. A water-air linkage control method for a vibratory stone crushing pile machine, wherein the vibratory stone crushing pile machine includes a telescopic guide rod and a vibratory compactor, characterized in that, include: The pipes for supplying water and gas extend from the top of the telescopic guide rod to the bottom of the telescopic guide rod, so that the water and gas flow from bottom to top inside the telescopic guide rod under the action of the baffle at the bottom of the telescopic guide rod, and flow out from the top of the telescopic guide rod. The pipe for supplying sewage passes through the telescopic guide rod and the vibratory flusher and extends from the bottom of the vibratory flusher. The pipe for supplying sewage air passes through the telescopic guide rod and extends from the side wall of the bottom sleeve of the telescopic guide rod, so that the sewage sprayed from the bottom of the vibratory flusher and the sewage air sprayed from the bottom of the telescopic guide rod can perform water flushing and air flushing pre-damage on the formation. During vibratory compaction, the water pressure inside the telescopic guide rod must always be greater than the external mud pressure to prevent external mud from entering the telescopic guide rod through the gaps. at the same time Control the water supply flow rate and the air supply pressure to remove small amounts of sand and gravel that have entered the telescopic guide rod through the combined action of water and air supply. During vibro-compaction construction, the current formation density corresponding to the current vibro-compaction current is determined based on the real-time acquisition of the current vibro-compaction current of the vibro-compaction device and the correspondence between the pre-set vibro-compaction current and the formation density in the controller. Based on the real-time water pressure of the supplied water obtained during vibro-compaction and the correspondence between the water pressure preset in the controller and the formation density, the target water pressure range corresponding to the current formation density is determined. Based on the real-time acquisition of the current gas pressure supplied during vibro-compaction and the correspondence between the preset gas pressure in the controller and the formation density, the target gas pressure range corresponding to the current formation density is determined. By controlling the flow rate of the supplied water and the pressure of the supplied gas, the current water pressure is made to reach the target water pressure range corresponding to the current formation density, and the current gas pressure is made to reach the target gas pressure range corresponding to the current formation density, so that the vibratory compactor can complete the vibratory compaction under the synergistic action of water and gas.

2. The water-air linkage control method for the vibratory stone crushing pile machine according to claim 1, characterized in that, Obtaining the current sewage pressure for the supply includes: Obtain multiple instantaneous drainage pressures of the supply water; The average water pressure is obtained by averaging the multiple instantaneous water pressures. The obtained average drainage pressure is determined as the current drainage pressure.

3. The water-air linkage control method for the vibratory compaction stone pile machine according to claim 2, characterized in that, The current sewage pressure is compared with the upper and lower limits of the target sewage pressure range, and the sewage flow rate supplied by the second water pump is controlled by: When the current drainage pressure is greater than the upper limit of the target drainage pressure range, control the second water pump to reduce the drainage flow rate; When the current drainage pressure is less than the lower limit of the target drainage pressure range, control the second water pump to increase the drainage flow rate; When the current water pressure is within the target water pressure range, control the second water pump to maintain the water flow rate.

4. The water-air linkage control method for the vibratory stone crushing pile machine according to claim 3, Its characteristics are Therefore, the control of the water supply flow rate includes: Obtain the current water supply flow rate; The current water inflow rate is compared with the upper and lower limits of the target water inflow rate range to control the current water inflow rate within the target range. Within the range of quantities; The control of the supply air pressure includes: Obtain the gas pressure from the gas supply; The upper air pressure is compared with the upper and lower limits of the target upper air pressure range, and the upper air pressure supplied by the first air compressor is controlled so that the obtained upper air pressure is within the target upper air pressure range.

5. The water-air linkage control method for the vibratory stone crushing pile machine according to claim 4, characterized in that, The process of obtaining the current water supply flow rate includes: Obtain multiple instantaneous water flow rates from the water supply; The average water flow rate is obtained by averaging the multiple instantaneous water flow rates. The obtained average water flow rate is determined as the current water flow rate.

6. The water-air linkage control method for the vibratory compaction stone pile machine according to claim 1, characterized in that, Obtaining the current oscillation current of the oscillator includes: Real-time detection of the vibration current of the vibrator; The detected oscillation current is determined as the current oscillation current.

7. The water-air linkage control method for the vibratory stone crushing pile machine according to claim 1, characterized in that, The vibratory compaction construction includes vibratory hole making and vibratory densification.

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