CN116791569A

CN116791569A - Vibroflotation encryption method capable of realizing effective pile diameter of gravel pile

Info

Publication number: CN116791569A
Application number: CN202210255820.XA
Authority: CN
Inventors: 石峰; 郭万红; 孙亮
Original assignee: Sinohydro Foundation Engineering Co Ltd
Current assignee: Sinohydro Foundation Engineering Co Ltd
Priority date: 2022-03-15
Filing date: 2022-03-15
Publication date: 2023-09-22

Abstract

The invention discloses a vibroflotation encryption method capable of realizing the effective pile diameter of a gravel pile, which comprises the following steps: the vibroflotation construction of the broken stone pile holes is rapidly completed by controlling the vibroflotation speed-based drainage of a vibroflotation broken stone pile machine comprising a telescopic guide rod and a 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-impact encryption of the surrounding crushed stone filler by the vibration-impact device, a flow velocity sensor arranged in the vibration-impact device generates a real-time electric signal corresponding to the vibration amplitude of the vibration-impact device; and controlling the vibroflotation encryption of the vibroflotation device according to the real-time electric signals generated by the flow velocity 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

Vibroflotation encryption method capable of realizing effective pile diameter of gravel pile

Technical Field

The invention relates to the technical field of vibroflotation gravel piles, in particular to a vibroflotation encryption 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 encryption method capable of realizing the effective pile diameter of a gravel pile, which can accurately control the supply quantity of the sewage pressure according to different stratum compactedness, so that the vibroflotation construction of a stratum with a deep and thick covering layer of more than 50m is accelerated, and the gravel pile formed by vibroflotation gravel filling 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 encryption method capable of ensuring effective pile diameter of gravel piles comprises the following steps:

the vibroflotation construction of the broken stone pile holes is rapidly completed by controlling the vibroflotation speed-based drainage of a vibroflotation broken stone pile machine comprising a telescopic guide rod and a 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-impact encryption of the surrounding crushed stone filler by the vibration-impact device, a flow velocity sensor arranged in the vibration-impact device generates a real-time electric signal corresponding to the amplitude of the vibration-impact device;

And controlling the vibroflotation encryption of the vibroflotation device according to the real-time electric signals generated by the flow rate sensor arranged in the vibroflotation device, so that the pile diameter of the gravel pile formed by the gravel filler filled in the gravel pile hole is equal to the effective pile diameter.

In one example of the present invention, a flow rate sensor disposed within a vibroflotator includes:

a support bar with one end mounted to the housing of the vibroflotation motor;

a cylinder body which is arranged at the other end of the supporting rod and is filled with liquid;

a piston mounted inside the vibroflotation housing and extending into the cylinder, the piston comprising a piston rod and a piston head, the piston head dividing the cylinder interior into a first cavity and a second cavity;

a conduit connecting the first cavity and the second cavity;

a flow rate detector mounted on the pipe;

wherein, during the movement of the piston within the cylinder as the vibroflotator housing vibrates, the liquid within the cylinder flows through the flow rate detector via the pipe line, causing the flow rate detector to generate an electrical signal corresponding to the amplitude of vibration of the vibroflotator housing.

In another example of the present invention, a flow rate sensor disposed within a vibroflotator includes:

a cylinder body which is arranged on the inner side of the vibrator shell and is filled with liquid;

A support bar with one end mounted to the housing of the vibroflotation motor;

the piston is arranged at the other end of the supporting rod and comprises a piston rod and a piston head, and the piston head stretches into the cylinder body to divide the inner cavity of the cylinder body into a first cavity and a second cavity;

a conduit connecting the first cavity and the second cavity;

a flow rate detector mounted on the pipe;

wherein, during the movement of the cylinder body relative to the piston as the vibroflotation housing vibrates, the liquid in the cylinder body flows through the flow velocity detector via the pipeline, so that the flow velocity detector generates an electric signal corresponding to the vibration amplitude of the vibroflotation housing.

Preferably, controlling the vibroflotation encryption of the vibroflotation device according to the real-time electric signal generated by the flow rate sensor arranged in the vibroflotation device comprises:

comparing the amplitude of the real-time electric signal with a preset amplitude;

when the amplitude of the electric signal is smaller than or equal to the preset amplitude, judging that the pile diameter of the crushed stone pile to be formed is equal to the effective pile diameter, and lifting the vibroflotation device upwards to vibroflotate crushed stone in the middle part of the crushed stone pile to be formed, so that the crushed stone pile with the pile diameter equal to the effective pile diameter is finally formed;

When the amplitude of the electric 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.

analyzing the amplitude of the preceding electric signal and the amplitude of the following electric signal obtained by the flow sensor in the vibroflotation period;

when the amplitude of the subsequent electric signal is smaller than that of the preceding electric 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 gravel pile to be formed, so that the gravel pile with the pile diameter equal to the effective pile diameter is finally formed.

Preferably, by performing a launch control based on a vibroflotation speed for a vibroflotation gravel pile machine including a telescopic guide rod and a vibroflotation device, a vibroflotation construction for rapidly completing a gravel pile hole includes:

the method comprises the steps of obtaining the vibroflotation speed and the current drainage pressure of a vibroflotation device in the vibroflotation construction process;

Comparing the obtained vibroflotation speed with a vibroflotation speed threshold;

and controlling the flow of the discharged water to be supplied according to the obtained comparison result of the vibroflotation speed and the vibroflotation speed threshold value, thereby adjusting the current discharged water pressure, and completing vibroflotation construction by using the vibroflotation of the vibroflotation device and the adjusted current discharged water pressure.

Wherein, the obtaining the vibroflotation speed of the vibroflotation device comprises: and obtaining the lowering depth of the vibroflotation device in unit time.

Wherein, according to the obtained comparison result of the vibroflotation speed and the vibroflotation speed threshold, controlling the discharge flow of the supplied sewage comprises:

if the obtained vibroflotation speed is smaller than the lower limit value of the vibroflotation speed threshold or larger than the upper limit value of the vibroflotation speed threshold, an alarm is sent out and the discharge flow of the supplied sewage is controlled according to a set value;

and if the obtained vibroflotation speed is within the vibroflotation speed threshold range, controlling the flow of the sewage supplied by the sewer according to the current stratum compactness obtained in the vibroflotation construction process.

Preferably, the controlling the flow rate of the sewage supplied according to the current formation compactness obtained in the vibroflotation construction process includes:

comparing the current formation compactness with a formation compactness calibration value;

And controlling the flow rate of the discharged water to be supplied according to the comparison result of the current formation compactness and the formation compactness calibration value, so as to adjust the current discharged water pressure, and completing the vibroflotation construction by using the vibroflotation device vibroflotation and the adjusted current discharged water pressure.

Preferably, the formation compactness calibration value is a formation compactness threshold value; controlling the flow of the sewer water for supplying the sewer water according to the comparison result of the current formation compactness and the formation compactness threshold value comprises the following steps:

if the current formation compactness is greater than the upper limit value of the formation compactness threshold value, controlling the water pump to increase the supplied discharge flow;

if the current formation compactness is smaller than the lower limit value of the formation compactness threshold value, controlling the water pump to reduce the supplied water discharge flow;

and if the current formation compactness is between the upper limit value and the lower limit value of the formation compactness threshold, controlling the water pump to maintain the supplied water discharge.

Preferably, when the water pump is controlled to increase the supplied flow rate of the water, the upper and lower values of the formation firmness threshold are increased to form a new formation firmness threshold.

Preferably, when the water pump is controlled to reduce the supplied flow rate of the sewer, the lower and upper values of the formation firmness threshold are reduced, forming a new formation firmness threshold.

Or the formation compactness calibration value is the formation compactness acquired before; controlling the flow of the sewer water for supplying the sewer water according to the comparison result of the newly acquired current formation compactness and the previously acquired formation compactness comprises:

if the current stratum compactness is greater than the stratum compactness obtained before and is greater than or equal to a first preset value, controlling the water pump to increase the supplied discharge flow;

if the current formation compactness is smaller than the previously acquired formation compactness and is larger than or equal to a second preset value, controlling the water pump to reduce the supplied water discharge;

if the difference between the current formation firmness and the previously acquired formation firmness is within a preset range, the water pump is controlled to maintain the supplied water discharge flow.

Wherein, obtaining the current formation compactness comprises:

acquiring the current vibroflotation current of a vibroflotation device;

according to a preset corresponding relation between the vibroflotation current and the formation compactness, the formation compactness corresponding to the current vibroflotation current is calculated;

and determining the calculated formation compactness as the current formation compactness.

The vibroflotation construction comprises vibroflotation pore-forming and vibroflotation encryption.

The beneficial effects of the invention are as follows:

1) The invention monitors the vibroflotation speed of the vibroflotation device in real time in the vibroflotation construction process, and controls the supply quantity of the downflow pressure through the vibroflotation speed, thereby improving the success rate of vibroflotation construction and being beneficial to smoothly carrying out the formation vibroflotation construction of deep coverage layers of more than 50 m;

2) When the vibroflotation speed of the vibroflotation device is within the threshold value range of the vibroflotation speed, the invention precisely controls the supply quantity of the lower water pressure according to the compactness of different strata so that the vibroflotation device and the proper lower water pressure jointly act to smoothly finish the deep hole vibroflotation construction of the complex stratum, thereby solving the difficult problem of the deep-thickness coverage stratum vibroflotation construction of more than 50 m;

3) The invention carries out average treatment on the instantaneous sewage pressure with the pulsating pressure, and the obtained average sewage pressure is closer to the true value of sewage pressure supply, thereby realizing accurate control on the sewage pressure.

4) 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 launch control system of an 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 the sewage of the vibroflotation gravel pile machine according to the embodiment of the invention;

FIG. 6 is a flow chart of a method for obtaining current sewer pressure during vibroflotation construction according to an embodiment of the invention;

FIG. 7 is a flow chart of controlling the flow of the sewer water to be supplied according to the comparison result of the current formation compactness and the formation compactness threshold value according to the embodiment of the invention;

FIG. 8 is a schematic view of the present invention with a flow rate sensor disposed within the vibroflotator housing;

FIG. 9a is an enlarged schematic view of a first example of portion A of FIG. 8;

FIG. 9b is an enlarged schematic view of a second example of portion A of FIG. 8;

FIG. 10 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. 11 is a flowchart of a first embodiment of the vibroflotation encryption control performed by the encryption control section in fig. 10;

fig. 12 is a flowchart of a second embodiment of vibration encryption control by the encryption control section in fig. 10.

Detailed Description

Fig. 1 shows a construction method for realizing effective pile diameter of gravel pile, which comprises the following steps:

during the vibroflotation encryption of the surrounding crushed stone filler by the vibroflotation device, a flow velocity sensor arranged in the vibroflotation device generates a real-time electric signal corresponding to the amplitude of the vibroflotation device;

And controlling the vibroflotation encryption of the vibroflotation device according to the real-time electric signals generated by the flow velocity 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 electric signal generated by a flow velocity sensor arranged in the vibroflotation device, the vibroflotation encryption of the vibroflotation device is controlled, and the method comprises the following steps:

The preset amplitude of the present invention is an amplitude at which the vibrator amplitude obtained in advance is reduced to the minimum.

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 vibroflotation gravel pile machine of the invention performs the drainage control based on the vibroflotation speed, which comprises the following steps: acquiring the current formation compactness and the vibration punching speed of a vibration punching device in the vibration punching construction process; and controlling the discharge flow of the water supplied by the water pump in real time according to the vibroflotation speed and the current stratum compactness, so that the vibroflotation construction is finished under the combined action of the vibroflotation device and the discharge.

The invention is suitable for shallow Kong Zhenchong with a single stratum and deep hole vibroflotation with complex stratum, and ensures smooth implementation of shallow hole or deep hole vibroflotation construction.

The vibroflotation construction comprises vibroflotation pore-forming and vibroflotation encryption construction.

The invention will now be described in detail with reference to the drawings and examples.

The present embodiment provides a method for controlling the drainage of an vibroflotation gravel pile machine, as shown in fig. 5, including:

s100, 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;

s101, obtaining the vibroflotation speed of a vibroflotation device and the current drainage pressure in the vibroflotation construction process;

s102, comparing the obtained vibroflotation speed with a vibroflotation speed threshold;

And S103, controlling the flow of the discharged water to be supplied according to the obtained comparison result of the vibroflotation speed and the vibroflotation speed threshold value, thereby adjusting the current discharged water pressure, and completing vibroflotation construction by using the vibroflotation speed and the adjusted current discharged water pressure.

In one implementation manner of this embodiment, S101 obtains the vibroflotation speed of the vibroflotation device during the vibroflotation construction process, and obtains the vibroflotation speed by detecting the lowering depth of the vibroflotation device in unit time.

The specific implementation method is as follows: the controller sends a depth detection instruction to the depth detection device; the lowering depth detection device detects the lowering depth of the vibroflotation device in real time according to the depth detection instruction sent by the controller, and feeds back the detection result to the controller.

The calculated starting point of the descending depth of the vibroflotation device is a depth zero point. When the bottom end (a drainage outlet) of the vibroflotation device is overlapped with the depth zero point, calculating the descending depth of the vibroflotation device, wherein the depth zero point is a pre-designed orifice position, and the hole depth below the depth zero point is the descending depth of the vibroflotation device.

The depth zero point can be judged by artificial observation. The automatic judging method can also be adopted, for example, a detection element can be arranged at the designed orifice zero position, when the bottom end of the vibroflotation device reaches the designed orifice zero position, the detection element sends a depth zero signal to the controller, the controller sends a depth detection instruction to the depth detection device after receiving the depth zero signal, and the depth detection device detects the depth of the vibroflotation device in real time according to the depth detection instruction sent by the controller and feeds back the detection result to the controller. The detection element may be a proximity sensor or an element of the prior art that senses the position of the object.

Wherein, the device for detecting the depth of falling can adopt a depth sensor or a displacement sensor in the prior art. In addition, the lowering depth of the vibroflotation device can be obtained by adopting any method for detecting the depth in the prior art.

After the lowering depth of the vibroflotation device is obtained, the lowering depth of the vibroflotation device in unit time is calculated, so that the vibroflotation speed of the vibroflotation device is obtained.

In one implementation of this embodiment, the vibroflotation speed is obtained once every time t, and the vibroflotation speed in the time period is obtained by calculating the unit time depth of the depth of descent in the time t.

As shown in fig. 3, the depth of drop detection device transmits the depth of drop detected in time t to the remote terminal unit RTU, and the RTU wirelessly transmits a signal to the controller 1, and the controller 1 calculates the depth of drop per unit time, thereby obtaining the vibroflotation speed of the vibroflotation device.

After the vibroflotation speed of the vibroflotation device is obtained, S103 controls the flow of the sewage to be supplied according to the comparison result of the obtained vibroflotation speed and the threshold value of the vibroflotation speed, including:

Wherein the lower limit value of the vibration velocity threshold is a prescribed minimum vibration velocity, and the upper limit value of the vibration velocity threshold is a prescribed maximum vibration velocity. The minimum vibroflotation speed and the maximum vibroflotation speed can be according to engineering practice or combined with equipment parameter settings, for example, the minimum vibroflotation speed is set to be 0.6m/min, the maximum vibroflotation speed is set to be 2.00m/min, and the threshold value of the vibroflotation speed is {0.6,2.00} m/min.

If the obtained vibroflotation speed is smaller than the lower limit value of the vibroflotation speed threshold, sending out an alarm and controlling the water pump to supply the sewage according to the set maximum sewage flow; and if the obtained vibroflotation speed is greater than the upper limit value of the vibroflotation speed threshold, sending out an alarm and controlling the water pump to supply the sewage according to the set minimum sewage flow. Wherein the maximum and minimum downflow rates may be set according to engineering practices or in conjunction with plant parameters.

And if the obtained vibroflotation speed is within the vibroflotation speed threshold range, controlling the discharge flow of the supplied sewage according to the current stratum compactness obtained in the vibroflotation construction process. The specific implementation mode is as follows:

The method for obtaining the current formation compactness in the vibroflotation construction process, as shown in fig. 4, comprises the following steps:

s201, acquiring the current vibroflotation current of a vibroflotation device;

s202, calculating 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 calculated 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, calculating 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 calculated 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 manner of the embodiment, the formation compactness Dr (%) is taken as 0 to 1, and a large amount of data obtained through field test is analyzed to determine that the vibroflotation current and the formation compactness are in a proportional relation, and a specific formula is as follows: dr=k×i; wherein, I (A) is vibroflotation current, dr (%) is formation compactness, and k is a proportional coefficient.

After the controller obtains the current vibroflotation current, calculating the formation compactness corresponding to the current vibroflotation current through a preset formula dr=k×i in the controller, and determining the calculated formation compactness as the current formation compactness. For example, in a preferred embodiment, k=1/380 is taken. Where I < ie=380a (vibroflotation rated current). When the current vibroflotation current i=190A obtained by the controller 1, the formation compactness Dr (%) is calculated to be 0.5 according to the formula dr=k×i, and the formation compactness is determined to be 0.5.

It should be noted that, the formula dr=k×i only shows one correspondence relationship between the vibroflotation current and the formation compactness, and for more complex formations, the controller may also obtain other more complex correspondence relationships according to the field test data.

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: s101, obtaining current sewer pressure in the vibroflotation construction process, as shown in FIG. 8, comprises the following steps:

s301, acquiring a plurality of instantaneous sewage pressures for supplying sewage;

s302, carrying out average treatment on the instantaneous water pressures to obtain an average water pressure;

and S303, determining the obtained average sewer pressure as the current sewer pressure.

Wherein, when the plurality of instantaneous water pressures of the supply sewage are obtained in S301, the interval time of obtaining the adjacent two instantaneous water pressures is equal.

In one implementation of this embodiment, S302 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, S302 averages the plurality of instantaneous water pressures to obtain an average water pressure, which is 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 above two embodiments, as shown in fig. 3, a water supply pressure detection sensor 41 and a water supply flow rate detection sensor 42 are installed on the water outlet pipe of the water pump 4, and are respectively used for detecting the instantaneous water outlet pressure and the instantaneous water outlet flow rate of the water supplied from the water pump 4 in real time. The water supply pressure detection sensor 41 and the water supply flow rate detection sensor 42 may employ any of the sensors capable of detecting water pressure and water flow rate in the related art. For example, the water supply pressure detection sensor 41 may be a pressure transmitter, and the water supply flow rate detection sensor 42 may be an electromagnetic flowmeter.

A pressure signal averaging circuit is added to the inside of the water supply pressure detecting sensor 41 for averaging the n instantaneous downwater pressures continuously detected by the 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 water supply flow detection sensor 42, and is used for averaging the continuous n instantaneous water flows to obtain an average water flow, and the controller 1 determines the collected average water flow as the current water flow.

As shown in fig. 3, the water supply pressure detection sensor 41 and the water supply flow rate detection sensor 42 transmit an average sewer pressure signal and an average sewer flow rate signal to the remote terminal unit RTU, which transmits signals to the controller 1 by wireless.

A pressure signal average processing module and a flow signal average processing module may be added to the controller, and the controller may average the n instantaneous downwater pressures transmitted from the water supply pressure detection sensor 41 and the n instantaneous downwater flows transmitted from the water supply flow detection sensor 42 to obtain an average downwater pressure and an average downwater flow, respectively, determine the average downwater pressure as the current downwater pressure, and determine the average downwater flow as the current downwater flow.

If the obtained vibroflotation speed is within the vibroflotation speed threshold range, controlling the discharge flow of the supplied sewage according to the current formation compactness obtained in the vibroflotation construction process, including:

comparing the acquired current formation compactness with a formation compactness calibration value;

In one implementation of the present embodiment, the formation compaction calibration value is a formation compaction threshold. According to the comparison result of the current formation compactness and the formation compactness threshold value, controlling the flow of the sewer water for supplying the sewer water, which specifically comprises the following steps:

s401, if the current formation compactness is greater than the upper limit value of the formation compactness threshold, controlling the water pump to increase the supplied discharge flow;

s402, if the current formation compactness is smaller than the lower limit value of the formation compactness threshold, controlling the water pump to reduce the supplied water discharge;

s403, if the current formation compactness is between the upper limit value and the lower limit value of the formation compactness threshold, controlling the water pump to keep the supplied water discharge.

When the control of the water pump to increase the supplied discharge flow is performed S401, the upper and lower limit values of the formation compactness threshold are increased, forming a new formation compactness threshold.

When the control of the water pump to reduce the supplied flow rate is performed S402, the lower and upper values of the formation compactness threshold are reduced, forming a new formation compactness threshold.

When the water pump is controlled to increase or decrease the supplied water discharge flow, the water pump increases or decreases the supplied water discharge pressure. In one implementation of this embodiment, the pressure of the water supplied by the water pump is increased or decreased in a periodic step-wise manner; specifically, the water pump supplies a downwater pressure p=current downwater pressure p±n×a downwater pressure step value Δp, n=1, 2, 3 … ….

The formation compactness threshold is increased or decreased in a stepping manner; specifically, the subsequent formation solidity threshold = the preceding formation solidity threshold ± threshold step value (Δdr).

It should be noted that, the manner in which the pressure of the water supplied by the water pump and the formation compactness threshold are increased or decreased may be any manner known to those skilled in the art, and is not limited to the stepping manner described above.

The above embodiment is further explained by means of a preferred example. As shown in fig. 9:

The construction is started,

setting an initial stratum compactness threshold { Dr1, dr2}, a threshold stepping value DeltaDr, and an initial sewage pressure P ₀ The step value delta P of the sewage pressure and the step period T;

in the vibroflotation construction process, the current stratum compactness Dr and the current sewage pressure P are obtained at intervals of time t;

comparing the current formation solidity Dr with an initial formation solidity threshold { Dr1, dr2};

when the acquired current formation compactness Dr is greater than the upper limit value Dr2 of the initial formation compactness threshold, controlling the water pump to increase the supplied sewage flow, so as to increase the supplied sewage pressure; the water pressure supplied by the water pump is increased in a periodical stepping mode, namely, the water pressure P=the current water pressure P+n is ΔP, n=1, 2 and 3 … …, and a ΔP is increased every period T until a command for maintaining or reducing the water pressure is received;

when the water pump is controlled to increase the supplied water flow, the upper limit value Dr2 and the lower limit value Dr1 of the initial formation compactness threshold are increased to form a new formation compactness threshold { Dr1, dr2}, and the new formation compactness threshold { Dr1, dr2} is determined as the current formation compactness threshold { Dr1, dr2}; wherein the new formation solidity threshold { Dr1, dr2} = the previous formation solidity threshold { Dr1, dr2} + +Δdr;

comparing the current formation compactness Dr with a current formation compactness threshold { Dr1, dr2};

when the acquired current stratum compactness Dr is smaller than the lower limit value Dr1 of the current stratum compactness threshold value, controlling the water pump to reduce the supplied sewage flow, so as to reduce the supplied sewage pressure; the water pressure supplied by the water pump is reduced in a periodical stepping mode, namely the water pressure P=the current water pressure P-n is deltaP, n=1, 2 and 3 … …, and one deltaP is reduced every period T until a command for maintaining or increasing the water pressure is received;

when the water pump is controlled to reduce the supplied water flow, the upper limit value Dr2 and the lower limit value Dr1 of the formation compactness threshold are reduced, a new formation compactness threshold { Dr1, dr2} is formed, and the new formation compactness threshold { Dr1, dr2} is determined as the current formation compactness threshold { Dr1, dr2}; wherein the new formation solidity threshold { Dr1, dr2} = the previous formation solidity threshold { Dr1, dr2} - Δdr;

when the obtained current formation solidity Dr is within the range of the current formation solidity threshold { Dr1, dr2}, the water pump is controlled to maintain the supplied sewage flow, thereby maintaining the supplied sewage pressure, until an instruction to decrease or increase the sewage pressure is received.

The initial formation compactness threshold { Dr1, dr2} is set by a preset formula dr=k×i and the obtained current vibroflotation current I. Specifically, after the initial vibroflotation current I is obtained, the initial formation compactness Dr is calculated by substituting the formula dr=k×i, the lower limit value dr1 of the initial formation compactness threshold value=the initial formation compactness Dr- Δdr, and the upper limit value dr2 of the initial formation compactness dr++ Δdr. It should be noted that, the specific setting rule of the initial formation compactness threshold may be adjusted according to experience or on-site data.

In another implementation of this embodiment, the formation compaction calibration value is a previously acquired formation compaction. Controlling the flow of the sewer water for supplying the sewer water according to the comparison result of the current formation compactness and the previously acquired formation compactness, and specifically comprises the following steps:

s501, if the current formation compactness is greater than the previously acquired formation compactness and greater than or equal to a first preset value, controlling a water pump to increase the supplied discharge flow;

S502, if the current formation compactness is smaller than the previously acquired formation compactness and is larger than or equal to a second preset value, controlling the water pump to reduce the supplied water discharge;

and S503, if the difference value between the current formation compactness and the previously acquired formation compactness is within a preset range, controlling the water pump to maintain the supplied water discharge.

The first predetermined value and the second predetermined value may be the same or different.

The above embodiment is further explained by means of a preferred example.

The present preferred embodiment sets the first predetermined value and the second predetermined value to be the same, both being Δdr.

Starting construction;

setting a first predetermined value=a second predetermined value= Δdr, and setting an initial sewage pressure P ₀ The step value delta P of the sewage pressure and the step period T;

comparing the current formation compactness Dr with the previously acquired formation compactness Dr0;

when the acquired current formation compactness Dr is greater than the previously acquired formation compactness Dr0 and is greater than or equal to a first preset value DeltaDr, controlling the water pump to increase the supplied sewage flow, so as to increase the supplied sewage pressure; the water pressure supplied by the water pump is increased in a periodical stepping mode, namely, the water pressure P=the current water pressure P+n is ΔP, n=1, 2 and 3 … …, and a ΔP is increased every period T until a command for maintaining or reducing the water pressure is received;

When the acquired current formation compactness Dr is smaller than the previously acquired formation compactness Dr0 and smaller than or equal to a second preset value DeltaDr, controlling the water pump to reduce the supplied sewage flow, so as to reduce the supplied sewage pressure; the water pressure supplied by the water pump is reduced in a periodical stepping mode, namely the water pressure P=the current water pressure P-n is deltaP, n=1, 2 and 3 … …, and one deltaP is reduced every period T until a command for maintaining or increasing the water pressure is received;

when the difference between the current formation solidity Dr obtained and the formation solidity Dr0 obtained before is within a predetermined range (Δdr), the water pump is controlled to maintain the supplied sewage flow, thereby maintaining the supplied sewage pressure, until an instruction to decrease or increase the sewage pressure is received.

The current formation compactness Dr is obtained through operation of a preset formula dr=k×i and the obtained current vibroflotation current I. Specifically, after the initial vibroflotation current I is obtained, substituting the initial vibroflotation current I into a formula dr=k×i, and calculating the current formation compactness Dr.

As shown in fig. 3, the water pump 4 of this embodiment is connected to the controller 1 through the water pump variable frequency cabinet 5, and the 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 water pump 4 by controlling the water pump variable frequency cabinet 5 to change the output frequency, so that the discharge flow of the water supplied by the water pump 4 is changed, and when the discharge flow of the water discharged by the water pump outlet pipeline is increased, the discharge pressure is also increased; when the discharge flow rate of the water discharged from the water outlet pipeline of the water pump is reduced, the pressure of the water 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 control process of the drainage is as follows:

1. after the vibroflotation device 3 is started, the lowering depth detection device detects the lowering depth of the vibroflotation device in real time, the water supply pressure detection sensor 41 detects the instantaneous lowering pressure in real time, and the water supply flow detection sensor 42 detects the instantaneous lowering flow in real time;

2. the controller 1 obtains the vibroflotation speed, the current vibroflotation current, the current water pressure and the current water discharge flow;

3. the controller 1 compares the obtained vibroflotation speed with a vibroflotation speed threshold value and controls the discharge flow of the water pump supply sewage according to the comparison result; if the obtained vibroflotation speed is smaller than the lower limit value of the vibroflotation speed threshold, sending out an alarm and controlling the water pump to supply the sewage according to the set maximum sewage flow; if the obtained vibroflotation speed is greater than the upper limit value of the vibroflotation speed threshold, sending out an alarm and controlling the water pump to supply the sewage according to the set minimum sewage flow; if the obtained vibroflotation speed is within the vibroflotation speed threshold range, controlling the discharge flow of the supplied sewage according to the current stratum compactness obtained in the vibroflotation construction process;

4. the controller 1 calculates the current formation compactness according to the obtained current vibroflotation current; and controlling the discharge flow of the water supplied by the water pump through the comparison result of the current formation compactness and the formation compactness threshold value, thereby adjusting the current discharge pressure.

Fig. 8 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 a flow rate sensor 1311 and a support rod 1312 for fixing the flow rate sensor 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. 8 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 a flow rate 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-impact encryption of the surrounding crushed stone filler by the vibration-impact device, a flow velocity sensor arranged in the vibration-impact device generates a real-time electric signal corresponding to the vibration amplitude of the vibration-impact device;

controlling vibration and impact encryption of the vibration and impact device according to the real-time electric signals generated by the flow velocity sensor arranged in the vibration and impact device, so that the pile diameter of the crushed stone filled in the crushed stone pile hole to form a crushed stone pile is equal to the effective pile diameter

Fig. 9a shows an example of a flow rate sensor 1311 provided in a vibroflot according to the present invention, as shown in fig. 9a, the flow rate sensor 1311 includes: a support bar 1312 having one end mounted to the housing of the vibroflotation motor 1304; a cylinder 1313 containing a liquid mounted to the other end of the support rod 1312; a piston 1314 including a piston rod 13141 and a piston head 13142 mounted inside the vibroflotation housing 1308 and extending into the cylinder 1313, the piston head 13142 dividing the cylinder interior into a first cavity (cavity on the left side of fig. 9 a) and a second cavity (cavity on the right side of fig. 9 a); a conduit 1315 connecting the first cavity and the second cavity; a flow rate detector 1316 mounted on the pipe; during movement of the piston within the cylinder as the vibroflotator housing vibrates, liquid within the cylinder flows through the flow rate detector via the conduit, causing the flow rate detector to generate an electrical signal corresponding to the amplitude of vibration of the vibroflotator housing.

Fig. 9b shows another example of the flow rate sensor 1311 provided in a vibroflot according to the present invention, as shown in fig. 9b, the flow rate sensor 1311 includes: a cylinder 1313 mounted inside the vibrator housing 1308 and containing a liquid therein; a support bar 1312 having one end mounted to the housing of the vibroflotation motor 1304; a piston 1314 including a piston rod 13141 and a piston head 13142 mounted to the other end of the support rod 1312, the piston head 13141 extending into the cylinder 1313 dividing the cylinder interior into a first cavity (the cavity on the left side of fig. 9 b) and a second cavity (the cavity on the right side of fig. 9 b); a conduit connecting the first cavity and the second cavity; a flow rate detector mounted on the pipe; during movement of the cylinder body relative to the piston as the vibroflotator housing vibrates, liquid within the cylinder body flows through the flow rate detector via the conduit, causing the flow rate detector to generate an electrical signal corresponding to the amplitude of vibration of the vibroflotator housing.

Any of the existing sensors that convert flow rate into an electrical signal may be used with the present invention.

Fig. 10 shows a control section for controlling vibroflotation of a vibroflotation filler to carry out vibroflotation encryption control, which includes a flow rate sensor 1311 for generating an electric signal corresponding to the amplitude of the vibroflotation filler, an amplifier for amplifying the electric signal output from the flow rate sensor 1311, an analog-to-digital converter for analog-to-digital converting the electric signal output from the amplifier, a processor for processing the output from the analog-to-digital converter, a memory for storing data output from the processor, and a display for displaying data output 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 surface and the amplifier may be connected to the flow sensor 1311 by a cable.

It should be noted that when the processor processes the amplitude of the electrical signal, the processor processes the "amplitude of the electrical signal" into the "absolute value of the amplitude of the electrical signal" and then performs other processes.

The present invention can greatly extend the service life of the flow rate sensor relative to the inventor's other patent application for a pressure sensor mounted on the housing of the vibroflotation device. That is, since the flow rate 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 on the vibrator housing, and thus is not easily damaged.

Fig. 11 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-impact encryption of the broken stone filler by the vibration-impact device, a flow velocity sensor arranged in the vibration-impact device generates a real-time electric signal corresponding to the vibration amplitude of the vibration-impact device shell;

Step S302, obtaining the amplitude absolute value of the real-time electric signal by carrying out analog-digital conversion on the real-time electric signal;

step S303, judging whether the absolute value of the amplitude of the real-time electric signal is smaller than or equal to a preset amplitude value;

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. 12 shows a control flow of a second embodiment of controlling a vibroflotation device to perform vibration encryption control, including:

step S401, during the vibration impact encryption of the broken stone filler by the vibration impact device, a flow velocity sensor arranged in the vibration impact device generates a real-time electric signal corresponding to the vibration amplitude of the vibration impact device shell;

step S402, obtaining the absolute value of the amplitude of the previous electric signal and the absolute value of the amplitude of the subsequent electric signal by carrying out analog-digital conversion on the real-time electric signal;

step S403, judging whether the absolute value of the amplitude of the subsequent electric signal is smaller than or equal to the absolute value of the amplitude of the previous electric signal;

Step S404, if the judgment result of step S403 is yes, further judging whether the absolute value of the amplitude of the subsequent electric 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

1. The vibroflotation encryption method capable of realizing the effective pile diameter of the gravel pile is characterized by comprising the following steps of:

2. The vibroflotation encryption method of claim 1 wherein the flow rate sensor disposed within the vibroflotation device comprises:

a support bar with one end mounted to the housing of the vibroflotation motor;

A conduit connecting the first cavity and the second cavity;

a flow rate detector mounted on the pipe;

3. The vibroflotation encryption method of claim 1 wherein the flow rate sensor disposed within the vibroflotation device comprises:

a support bar with one end mounted to the housing of the vibroflotation motor;

a conduit connecting the first cavity and the second cavity;

a flow rate detector mounted on the pipe;

4. A vibroflotation encryption method according to claim 2 or 3, characterized in that controlling the vibroflotation encryption of the vibroflotation according to the real-time electrical signal generated by a flow rate sensor arranged in the vibroflotation comprises:

when the amplitude of the real-time electric signal is smaller than or equal to the preset amplitude, judging that the pile diameter of the crushed stone pile to be formed is equal to the effective pile diameter, and lifting the vibroflotation device upwards to vibroflotate crushed stone in the middle part of the crushed stone pile to be formed, so that the crushed stone pile with the pile diameter equal to the effective pile diameter is finally formed;

when the amplitude of the real-time electric 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 encryption method of claim 4 wherein the predetermined amplitude is a value obtained in advance when the amplitude of the vibrator is reduced to a minimum.

6. A vibroflotation encryption method according to claim 2 or 3, characterized in that controlling the vibroflotation encryption of the vibroflotation according to the real-time electrical signal generated by a flow rate sensor arranged in the vibroflotation comprises:

7. The vibroflotation encryption method of claim 1, wherein the rapid completion of vibroflotation construction of the gravel pile hole by performing a vibroflotation speed-based launch control of the vibroflotation gravel pile machine including the telescopic guide rod and the vibroflotation device comprises:

8. The vibroflotation encryption method of claim 7, wherein the obtaining the vibroflotation speed of the vibroflotation device comprises: and obtaining the lowering depth of the vibroflotation device in unit time.

9. The vibroflotation encryption method of claim 7 or 8, wherein controlling the amount of the sewage flow supplied with the sewage according to the comparison result of the obtained vibroflotation speed and the vibroflotation speed threshold value comprises:

10. The vibroflotation encryption method of claim 9, wherein controlling the flow of the offal water supplied according to the current formation compactness obtained during the vibroflotation process comprises: