CN106013034A - Saturated soft soil vibration centrifugal infiltration instrument - Google Patents

Abstract

The invention relates to a vibrating centrifugal seepage meter for saturated soft soil, comprising a bracket (23), a vibrating platform (18), a glass scale rotating cylinder (66), a rotating motor (60) fixed on the vibrating platform (18) and a water injection part . The vibration platform is controlled by the first loading console to vibrate in the horizontal direction; controlled by the second loading console to vibrate in the vertical direction; the glass scale rotating cylinder (66) includes a cylinder wall with scales, a coaxial large hollow cylindrical permeable stone (20) and small hollow cylinder permeable stone (8), its material is permeable concrete; The middle part of the glass scale rotating cylinder (66) is the motor shaft (4) of the rotary motor (60) extending out from the bottom of the cylinder; the large hollow cylinder permeable stone A soil sample groove (9) is formed between the inner wall of (20) and the outer wall of the small hollow cylindrical permeable stone (8), and a filter paper (6) is pasted on the soil sample groove (9) inwall. The invention can more accurately simulate the seepage and consolidation characteristics of soft soil under the action of dynamic load.

Description

Saturated Soft Soil Vibration Centrifugal Seepage Apparatus

technical field

The invention relates to a vibrating centrifugal seepage meter for saturated soft soil, in particular to a seepage meter which can calculate the permeability coefficient of saturated soft soil under vibration load and centrifugal action according to the seepage flow of water.

Background technique

Soil permeability characteristics are an important aspect of geotechnical engineering characteristics research. The index to measure soil permeability characteristics is permeability coefficient. The existing experimental devices for measuring permeability coefficient mainly include constant head Darcy seepage meter and variable head Darcy seepage meter. The experiment The instrument has the advantages of high accuracy and mature technology for the measurement of sandy soil permeability coefficient.

However, saturated soft soil has the characteristics of high water content, high compressibility, high void ratio, low bearing capacity, and low seepage "three highs and two lows", and its seepage often shows non-Darcy seepage characteristics. Using the existing constant head Darcy seepage meter and variable head Darcy seepage meter to measure the permeability coefficient of soft soil will cause the results to deviate from the actual engineering and cannot guide the geotechnical engineering investigation. Loss.

With the continuous acceleration of the urban process, transportation projects such as subways, railways, and highways have developed rapidly. China's high-speed railway projects that have been built and are under construction rank first in the world. Geotechnical engineering investigation pays more attention to the impact of different frequency dynamic loads on the engineering properties of soft soil and the migration of pollutants in the soil, especially the seepage characteristics of soft soil under the dynamic load and centrifugal coupling. Currently, the existing constant head detector is still used The measurement of the permeability coefficient of soft soil by the West seepage meter and the variable head Darcy seepage meter is inconsistent with engineering practice, let alone simulate how pollutants migrate in the soil, and there is a lack of corresponding experimental devices.

Therefore, people began to pay more and more attention to the study of seepage characteristics of soft soil, and applied the research results accumulated from theoretical research and engineering experience to engineering practice.

The centrifuge model test is internationally recognized as the most effective and advanced scientific test platform for studying rock and soil dynamics. In 1931, Columbia University in the United States first developed the world's first geotechnical centrifuge with a radius of 0.25m. In the early 1870s, geotechnical centrifuges were successively developed in the United States, Britain, the Soviet Union, France, Japan and other countries, and the rotary table centrifuge was developed. Centrifuges, hanging basket centrifuges and drum centrifuges, our country began to pay attention to power centrifuge technology in the 1880s. It was abbreviated by the Yangtze River Science Research Institute in 1982. The maximum centrifugal acceleration reaches 300g, and the capacity is 150g-t. The effective radius is 3m. Up to now, my country has more than 20 centrifuges. The test model can truly and accurately reflect the behavior and behavior of the prototype. The model and the prototype need to meet the three basic conditions of geometric similarity, motion similarity and dynamic similarity, that is, the similarity criterion corresponding to each parameter and the coordination relationship between parameters . Assuming that the model uses prototype materials (including porous media, etc.), under the condition of centrifugal acceleration Ng, based on the principle of dynamic centrifugal simulation test, "similarity three theorems" and balance equations, the similarity factor of each physical parameter between the model and the prototype can be deduced. Although the experimental instrument can calculate the permeability coefficient of soft soil, the operation is complicated, and the magnitude and frequency of vibration load in the horizontal and vertical directions cannot be artificially controlled.

In 2010, the new multifunctional permeameter developed by Tongji University and the experimental teaching of Darcy's law can better simulate the seepage in double-layer or multi-layer structure aquifers in nature, although the instrument considers different seepage media and seepage directions , but it is not suitable for the measurement of dynamic permeability coefficient of soft soil.

In 2012, the American Institute of Engineers developed a centrifugal seepage meter for unsaturated soils. By simulating the permeability characteristics of unsaturated soils under N _r g conditions, the permeability coefficient of unsaturated soils under actual conditions is reversed based on similar principles. Although the instrument can accurately calculate the permeability coefficient of unsaturated soil and simulate the migration of pollutants in the soil, the experimental instrument cannot simulate the permeability coefficient of soft soil under different frequencies or frequency combination dynamic loads.

Existing experimental instruments often cannot artificially control dynamic loads of different fixed frequencies or combined frequencies, and it is difficult to measure the permeability coefficient of soft soil accurately.

Contents of the invention

The object of the present invention is to provide a saturated soft soil vibrating centrifugal seepage meter which can more accurately simulate the seepage consolidation characteristics of soft soil under the action of dynamic load. The technical scheme is as follows:

A vibrating centrifugal seepage meter for saturated soft soil, comprising a bracket 23, a vibrating platform 18, a first loading console and a second loading console, a glass scale rotating cylinder 66, a rotating motor 60 fixed on the vibrating platform 18 and a water injection part.

One side of the vibration platform 18 is connected to the support 23 through the horizontal spring 2, and the other side is fixedly connected to the steel column 39 of the first loading console through the first rigid rod 27, and is controlled by the first loading console to vibrate in the horizontal direction;

The lower part of the vibrating platform 18 is connected to the support 23 through the vertical spring 22, and the lower part of the vibrating platform 18 is fixedly connected to the steel column 39 of the second loading console through the second rigid bar 32 near the middle, and is controlled by the second loading console. Vibrate vertically;

The glass scale rotating cylinder 66 includes a cylinder wall with a scale, a coaxial large hollow cylindrical permeable stone 20 and a small hollow cylindrical permeable stone 8, and its material is permeable concrete; the middle part of the glass scale rotating cylinder 66 is a rotating motor extending from the bottom of the cylinder The motor shaft 4 of 60; the soil sample groove 9 is formed between the inner wall of the large hollow cylindrical permeable stone 20 and the outer wall of the small hollow cylindrical permeable stone 8, and a filter paper 6 is pasted on the inner wall of the soil sample groove 9, and a saturated soil sample is placed; The cavity formed by the cylinder wall with scale and the outer wall of the large hollow cylindrical permeable stone 20 is called the sump 3;

The water injection part includes a reservoir 10 and a glass scale cylinder 64. The cavity 21 between the small hollow cylindrical permeable stone 8 and the motor shaft 4 communicates with the reservoir 10 below it, and the reservoir 10 is connected to the glass through a water pipe 12 The scale cylinder 64 is connected, and the position of the glass scale cylinder 64 is higher than the glass scale rotating cylinder 66, so that the water in the glass scale cylinder 64 smoothly flows into the glass rotating scale cylinder 66; the motor shaft 4 is driven by the rotating motor 60 to drive the rotating glass scale to rotate The soil sample in the soil sample tank 9 in the cylinder 66 is centrifugally moved.

As a preferred embodiment, the saturated soft soil vibrating centrifugal seepage meter has the same structure of the two loading consoles, including the first piston cylinder 36, the first piston 35, the second piston cylinder 37, the second piston 38, and the water tank 42. Steel column 39, displacement sensor, computer;

The bottom of the first piston cylinder 36 is connected with the first pipeline and the second pipeline, and the first pipeline stretches into the water in the water tank case 42, and the second pipeline links to each other with the bottom of the second piston cylinder 37. Road and the second pipeline are respectively provided with a first one-way valve 40 and a second one-way valve 41;

The second piston cylinder 37 communicates with the water in the water tank case 42 through the third pipeline with the regulating valve 24;

The second piston 38 in the second piston cylinder 37 is fixedly connected with the steel column 39, the displacement of the steel column 39 is measured by the displacement sensor, the displacement measurement result is sent into the computer, and the motion situation of the steel column 39 is displayed on the screen by the computer;

The main controller drives the reciprocating motion of the first piston 35 in the first piston cylinder 36 through the frequency converter 25 and the piston motor 11;

When the first piston 35 moved upwards, under the action of pressure, the water in the tank case 42 moved upwards through the first one-way valve 40 in the first pipeline and entered the first piston cylinder 36; Moving down, the water in the first piston cylinder 36 enters the second piston cylinder 37 through the second check valve 41 in the second pipeline, and the second piston 38 is lifted to move upward; when all the water in the first piston cylinder 36 When it is pressed into the second piston cylinder 37, the opening degree of the regulating valve 24 is controlled by the main controller to control the amount of water released by the water in the second piston cylinder 37, so as to achieve the control of the steel column 39, so that the steel column 39 can be adjusted according to a certain speed. Size down movement.

The present invention has the following advantages due to the adoption of the above technical scheme: 1. The present invention takes saturated soft soil as the research object, can truly simulate the seepage consolidation characteristics of soft soil under the action of dynamic load, and the calculated permeability coefficient and soil displacement value are more real Effective; 2. The present invention relates to a closed seepage device, through which the water output parameter ΔQ and time Δt and the two degrees h ₁ and h ₂ of the glass scale cylinder can determine the head loss and permeability coefficient, with few parameters and convenience; 3 , The present invention combines the vibrating table and the centrifuge together, can consider the influence of vibration and centrifugal coupling effect on the permeability characteristics of saturated soft soil, and the vibrating table is connected with tension and compression loaders and springs, which is simple and easy to implement. In a word, the structure setting of the present invention is simple and convenient; the measurement of the permeability coefficient of saturated soft soil is more accurate and closer to the real situation.

Description of drawings

Fig. 1 is the connection diagram of the vibrating platform of the vibrating centrifugal seepage instrument for saturated soft soil;

Fig. 2 is a control schematic diagram of the first and second vibration tension and compression loading of the saturated soft soil vibratory centrifugal seepage instrument;

Figure 3 is the seepage connection diagram of the vibrating centrifugal seepage meter for saturated soft soil

Figure 4 is a schematic diagram of the calculation principle of vibration centrifugal seepage in saturated soft soil;

Among the figure 1, driving rod; 2, first spring; 3, water collection tank; 4, motor shaft; 5, pressure relief valve; 6, filter paper; 8, small hollow cylindrical permeable stone; 9, soil sample tank; Pool; 11, piston motor; 12, water pipe; 17, rotary motor switch; 18, vibration platform; 20, large hollow cylindrical permeable stone; 21, cavity; 22, second spring; 23, bracket; 24, regulating valve; 25. Frequency converter; 27. First rigid rod; 32. Second rigid rod; 35. First piston; 36. First piston cylinder; 37. Second piston cylinder; 38. Second piston; 39. Steel column; 40. The first one-way valve; 41. The second one-way valve; 42. The water tank; 60. The rotating motor; 61. The base of the rotating barrel; 64. The glass scale cylinder; 66. The glass scale rotating cylinder.

detailed description

In order to further understand the invention content, characteristics and effects of the present invention, the following examples are now given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

The saturated soft soil centrifugal vibrating seepage meter in the saturated soft soil centrifugal vibrating seepage meter of the present invention includes a vibrating platform 18, a glass scale rotating cylinder 66, a rotating motor 60 and a water injection part.

In Fig. 1, one side of the vibration platform 18 is connected with the bracket 23 through the horizontal spring 2, and the other side is fixedly connected with the steel column 39 of the first loading console 19 through the first rigid rod 27, and the first loading console 19 Control to vibrate in the horizontal direction; the bottom of the vibration platform 18 is connected to the support by the vertical spring 22, and the middle part of the vibration platform 18 is fixedly connected with the steel column 39 of the second loading console 43 by the second rigid bar 32, controlled by the second loading Platform 43 controls to vibrate in the vertical direction; On the vibration platform 18, a rotary motor 60 is fixed,

In Fig. 2, the structure of the two loading consoles is the same, including the driving rod 1, the frequency converter 25, the piston motor 11, the first piston cylinder 36, the first piston 35, the first one-way valve 40, the tank box 42, the first Two one-way valves 41, the second piston cylinder 37, the second piston 38, the steel column 39, and the regulating valve 24. Working principle: turn on the AC stabilized voltage power supply, control the frequency converter 25 through the main controller, thereby changing the rotation speed of the piston motor 11, and the drive rod 1 connected with the piston motor 11 drives the first piston 35 in the first piston cylinder 36 to reciprocate Movement; when the first piston 35 moves upwards, and under the action of pressure, the water in the tank case 42 moves upwards through the first one-way valve 40 in the first pipeline, and enters the first piston cylinder 36; when the first The piston 35 moves downward, and the water in the first piston cylinder 36 enters the second piston cylinder 37 through the second one-way valve 41 in the second pipeline, lifts the second piston 38, and drives the steel column 39 to move upward. When all the water in the first piston cylinder 36 is pressed into the second piston cylinder 37, the opening degree of the regulating valve 24 is controlled by the main controller to control the amount of water released by the water in the second piston cylinder 37 to reach the steel column 39. control, so that the steel column 39 moves downward according to a certain speed; the displacement sensor is connected with the steel column 39, and when the steel column 39 is moving, the displacement sensor inputs the reciprocating motion signal of the steel column 39 into the computer. In the computer, it can be observed whether the steel column 39 moves according to a sine wave, a square wave or a triangular wave. The two loading consoles have the same structure, and the steel column 39 is rigidly connected to the right side and the bottom of the vibration platform 18 through the first rigid rod 27 and the second rigid rod 32 respectively, so as to realize horizontal and vertical tension and compression vibrations.

In Fig. 3, the glass scale rotating cylinder 66 includes a cylinder wall with a scale, a coaxial large hollow cylindrical permeable stone 20 and a small hollow cylindrical permeable stone 8, the material of which is permeable concrete; the middle part of the glass scale rotating cylinder 66 is a protrusion The motor shaft 4 at the bottom of the cylinder; a saturated soil sample is placed between the large hollow cylindrical permeable stone 20 and the small hollow cylindrical permeable stone 8, and filter paper 6 is pasted on the inner diameter and outer diameter surface of the soil sample.

The water injection part mainly includes a water storage tank 10 and a glass scale cylinder 64 . The cavity 21 between the small hollow cylindrical permeable stone 8 and the motor shaft 4 is connected to the glass scale cylinder 64 through the water pipe 12 and the water storage tank 10, and the position of the glass scale cylinder 64 is higher than the glass scale rotating cylinder 66, so that the glass scale cylinder 64 The water in the glass smoothly flows into the glass rotating scale cylinder 66; the motor shaft 4 is driven by the rotating motor 60 to drive the soil sample in the soil sample tank 9 in the rotating glass scale rotating cylinder 66 to do centrifugal motion.

In Fig. 4, the permeability coefficient of the vibrating centrifugal seepage meter for saturated soft soil of the present invention is calculated, and the following two formulas are obtained according to the water output of the sump tank and the time, one: only open the loading console, close the motor rotation controller, and have

$\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}\frac{\frac{\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; Q</span>}}{\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; t</span>}}}{\frac{<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; w</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; g</span>}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}{{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}}$

Second, turn on the motor rotation controller, turn off or turn on the loading console, and

$\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}\frac{\frac{\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; Q</span>}}{\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; t</span>}}}{\frac{<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; w</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}\mathrm{<span\; class="notranslate">\; g</span>}}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span>\frac{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}}{{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; w</span>}}\mathrm{<span\; class="notranslate">\; g</span>}}}{{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}}$

where a=w ² r=N _r g

ΔQ——Water output (L);

Δt—seepage time;

λ—soft soil seepage correction coefficient;

w——the angular velocity of the rotary motor 60 rotation;

g - acceleration of gravity;

r _i - the distance from the center line of the motor shaft 4 to the small hollow cylindrical permeable stone 8;

r ₀ ——the distance from the center line of the motor shaft 4 to the large hollow cylindrical permeable stone 20;

r——the distance from the center line of the motor shaft 4 to the glass scale rotating cylinder 66;

N _r —similarity coefficient;

_Pw —the pressure difference after passing through the soil sample. P _w = ρ _w gΔh;

ρ _{w ——the} density of water;

Δh——water head loss, that is, the difference between the value of the glass scale cylinder at the beginning of the test and the end of the test Δh=h ₁ -h ₂ ;

Now take the test of the saturated soft soil permeability coefficient under the simulated dynamic load and centrifugal coupling as an example to illustrate the specific application process of the present invention, and the specific implementation steps are as follows:

(1) After the test system is assembled according to the accompanying drawings, first put the filter paper 6 soaked in water into the inside of the soil sample tank 9, and check whether the small hollow cylindrical permeable stone 8 and the large hollow cylindrical permeable stone 20 are blocked, and then the saturated Soft soil sample is put into soil sample groove 9;

(2) The glass scale cylinder 64 is placed at a position higher than the rotating scale cylinder 66, the cavity 21 is filled with water, and the numerical value _h1 of the glass scale cylinder 64 is read;

(3) Turn on the vibrating table 18, select the waveform of the corresponding frequency by the main console, and control the vibration in the horizontal direction by the first loading console or the vertical displacement by the second loading console, according to the motion of the steel column 39 collected by the computer The case regulates the vibration frequency of the two loading consoles.

(4) Turn on the rotary motor switch 17 to determine the rotational speed ω by the rotary motor;

(5) Determine the water seepage time Δt, and record the water output ΔQ value of the glass scale rotating cylinder 66, and read the value h2 of the glass scale again _;

(6) Calculate the permeability coefficient by the above formula, and end the test.

Although a certain embodiment of the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific implementation. The above-mentioned specific implementation is only illustrative and not limiting. Under the enlightenment of the present invention, without departing from the gist of the present invention and the protection scope of the claims, the skilled person can also make many forms, and these all belong to the protection scope of the present invention.

Claims (2)

1. a saturated soft soil vibration centrifugal seepage instrument, including support (23), vibration platen (18), the first Loading Control platform and second loads control Platform processed, glass scales rotating cylinder (66), the electric rotating machine (60) being fixed on vibration platen (18) and water filling part；

The side of vibration platen (18) is connected with support (23) by horizontal spring (2), and opposite side passes through the first rigid rod (27) and first The steel column (39) of Loading Control platform is fixing to be connected, the first Loading Control platform control to do horizontal direction vibration；

The bottom of vibration platen (18) is connected with support (23) by uprighting spring (22), and the bottom of vibration platen (18) is by middle position It is connected by the second rigid rod (32) is fixing with the steel column (39) of the second Loading Control platform, the second Loading Control platform controls to do vertical direction vibration；

Glass scales rotating cylinder (66) includes with graduated barrel, coaxial big hollow cylinder permeable stone (20) and little hollow cylinder permeable stone (8), Its material is pervious concrete；Glass scales rotating cylinder (66) middle part is the machine shaft (4) stretching out the electric rotating machine (60) bottom cylinder；Big empty Form soil sample groove (9) between inwall and the outer wall of little hollow cylinder permeable stone (8) of heart cylinder permeable stone (20), paste at soil sample groove (9) inwall There is filter paper (6), and be placed with saturated soil sample；It is referred to as collection by the cavity formed with graduated barrel and big hollow cylinder permeable stone (20) outer wall Pond (3)；

Water filling part includes cistern (10) and glass scales cylinder (64), the sky between little hollow cylinder permeable stone (8) and machine shaft (4) Chamber (21) is connected with the cistern (10) being disposed below, and cistern (10) is connected with glass scales cylinder (64) by water pipe (12), The position of glass scales cylinder (64) is higher than glass scales rotating cylinder (66) so that the water in glass scales cylinder (64) flows into glass smoothly and rotates quarter Degree cylinder (66)；Machine shaft (4) is by the driving of electric rotating machine (60), the soil sample groove (9) being rotated in glass scales rotating cylinder (66) Soil sample do centrifugal motion.

Saturated soft soil vibration centrifugal seepage instrument the most according to claim 1, it is characterised in that the structure of two Loading Control platforms is identical, bag Include first piston cylinder (36), first piston (35), the second piston cylinder (37), the second piston (38), sink box (42), steel column (39), position Displacement sensor, computer,

The bottom of first piston cylinder (36) connects the first pipeline and the second pipeline, and the first pipeline reaches in the water in sink box (42), the second pipe Road is connected with the bottom of the second piston cylinder (37), is respectively arranged with the first check valve (40) and the second check valve (41) at the first pipeline and the second pipeline；

Second piston cylinder (37) is by connecting with the aqueous phase in sink box (42) with the 3rd pipeline of regulation valve (24)；

The second piston (38) in second piston cylinder (37) is fixing with steel column (39) to be connected, by the displacement of displacement sensor steel column (39), Displacement measurement is admitted to computer, computer show the motion conditions of steel column (39) on screen；

Master controller drives the reciprocating motion of first piston (35) in first piston cylinder (36) by converter (25) and piston motor (11)；

When first piston (35) moves upward, under pressure, the water in sink box (42) is by the first check valve (40) in the first pipeline Move upward, enter into first piston cylinder (36)；When first piston (35) moves downward, the water in first piston cylinder (36) is by the second pipe The second check valve (41) in road enters into the second piston cylinder (37), promotes the second piston (38) and moves upward；When first piston cylinder (36) In water when being all pressed into the second piston cylinder (37), regulate valve (24) beginning degree by main controller controls, control the second piston cylinder (37) The water consumption of middle water release, reaches the control to steel column (39), makes steel column (39) move downward according to certain velocity magnitude.