CN106841003B - Portable Multi-depth Permeability Field Measuring Device - Google Patents

Abstract

The invention discloses a portable multi-depth permeability coefficient on-site measurement device, which comprises a steel pipe main body and is characterized in that: the steel pipe main body consists of hollow steel pipes which are sleeved with each other front and back; a detachable instrument panel is sleeved on the first steel pipe at the outermost side, and a timer and a current signal converter are arranged in the instrument panel; the water level current signal collector is arranged in the steel pipe main body and consists of resistors which are mutually connected in series, a power supply, a power switch, an ammeter and a current signal collector, and the sealed water tank is formed by connecting wires in series; the current change signal collected by the current signal collector is transmitted to the current signal converter, the current signal converter converts the current change signal into a timing trigger signal to trigger the timer to read time data, and the permeability is obtained through the volume change relation between time and water in the water tank. The invention has the characteristics of simple operation, portability, strong function and low cost.

Description

Portable Multi-depth Permeability Field Measuring Device

technical field

The invention relates to a geotechnical in-situ test device, in particular to a device for on-site measurement of permeability coefficient.

Background technique

The permeability coefficient is an index that comprehensively reflects the permeability of soil, and the correct determination of its value is of great significance to the calculation of permeability. Its value can be measured in the laboratory, and can also be obtained by in-situ testing at the construction site.

The patent with the publication number of 103091229A is an on-site test device, but because its structure is not stable enough, the sealing effect is difficult to guarantee, and the measurement results may not meet the expected requirements.

The patent whose publication number is 104155229A is a portable soil surface in-situ vertical seepage test device, but the device has a complicated structure, and is relatively complicated in terms of operation and carrying.

The patent with the publication number 103344542A and the patent with the publication number 103868838A are both indoor testing devices. Indoor testing usually adopts the method of in-situ soil extraction and experimental filling, and compacts the experimental soil close to the on-site density to simulate in-situ The soil permeability characteristics are mainly due to the convenience of testing and advanced measurement methods, but the properties of the soil after disturbance will always change a little, so the obtained permeability coefficient will be different from that of the field soil. Therefore, the obtained results do not reflect the real situation of the soil.

Contents of the invention

In view of the defects in the prior art, the present invention proposes a device for measuring permeability coefficient on site, the purpose of which is to measure the permeability coefficient of formations at different depths. The device has the characteristics of simple operation, easy portability, strong function and low cost.

To achieve the above object, the solution of the present invention is:

A portable multi-depth permeability coefficient on-site measurement device, including a steel pipe body, characterized in that: the steel pipe body is a telescopic structure, composed of hollow steel pipes that are connected to each other at the front and back; it is socketed on the outermost first steel pipe A detachable instrument panel is provided. The instrument panel is equipped with a timer and a current signal converter; The pile head is detachably connected with the test pipe body through threads; a through hole is provided on the side wall of the test pipe body, and a filter screen cover is provided in the through hole; a water level is provided in the steel pipe body. A current signal collector, the water level current signal collector is composed of resistors connected in series in sequence, a power supply, a power switch, an ammeter, a current signal collector, and a sealed water tank connected in series through wires. Between the heads; the through hole is provided with a conduit to communicate with the sealed water tank, the bottom of the sealed water tank is provided with a drain switch, and the sealed water tank is provided with a first resistor connection point and a second resistor from bottom to top. connection point, the third resistance connection point and the fourth resistance connection point, the resistances are electrically connected between the adjacent resistance connection points, and from bottom to top are the first resistance, the second resistance, the third resistance and the fourth resistance Four resistors, the other end of the fourth resistor is electrically connected to the power supply; the current change signal collected by the current signal collector is transmitted to the current signal converter, and the current signal converter converts the current change signal into timing The trigger signal triggers the timer and simultaneously reads the time data.

Further, the power supply, power switch, ammeter, first resistor, second resistor, third resistor and fourth resistor are arranged in the instrument panel.

Further, the wire is a waterproof wire.

Further, adjacent hollow steel pipes can be fixedly connected by threads.

Furthermore, the inner wall of the hollow steel pipe is provided with a steel pipe barrier at the end far away from the pile head. The steel pipe barrier is in the shape of a ring, and the steel pipe barrier restricts excessive shrinkage of the steel pipe, affecting its normal use.

Further, the sealed water tank is made of plastic.

Further, a waterproof tape is provided at the connection between the pile head and the test pipe body.

Further, a spacer is provided at the end of the first steel pipe.

Further, utilize the portable multi-depth permeability coefficient on-the-spot measuring device of the present invention to measure the method for soil permeability coefficient as follows:

When in use, turn on the power switch, after _t0 time, the water level in the sealed water tank reaches the first connection point, the circuit is connected, the first resistor, the second resistor, the third resistor and the fourth resistor start to work, and the ammeter starts to have For reading, the current signal converter converts the current change signal transmitted by the current signal collector into a timing trigger signal to trigger the timer 5 to start working.

Further, as the seepage water in the sealed water tank 7 increases, the water level of the sealed water tank starts to rise, and a resistor is short-circuited for each rising height h, the current of the circuit changes, and the timer records the time points t ₁ and t ₂ when the current changes, ..., t _n ,, Δt is defined as the difference between two adjacent time points, and the cross-sectional area of the sealed water tank 7 is S.

Further, the permeability coefficient is calculated according to the obtained data, and the permeability coefficient of each stage can be obtained separately

Further, calculate the average permeability coefficient

Compared with prior art, the beneficial effect of the present invention is:

1. The present invention has a telescopic device, which has a small volume ratio when not in use and is easy to carry.

2. The present invention is easy to operate and can be operated by most of the construction personnel. It only needs to record the data and substitute it into the formula to obtain the permeability coefficient.

3. The present invention is an in-situ test experimental device, and the soil permeability coefficient obtained by on-site measurement is more authentic.

4. The present invention can measure the seepage coefficient of soil at different depths, and the amount of data obtained is larger.

5. The manufacturing cost of the present invention is low, and it has stronger popularization.

Description of drawings

Figure 1 is an overall view of the device;

Figure 2 is a partial diagram of the device;

Fig. 3 is a device expansion diagram;

Fig. 4 is a partial diagram 2 of the device;

Fig. 5 is a partial diagram three of the device;

Fig. 6 is a partial diagram four of the device;

Figure 7 is the circuit connection diagram of the instrument.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

In the figure, 1. Dashboard, 2. Block, 3. Power switch, 4. Ammeter, 5. Timer, 6. Steel pipe body, 7. Sealed water tank, 8. Through hole, 9. Filter cover, 10. Pile head, 11. steel pipe block, 12. first steel pipe, 13. wire, 14. third resistance, 15. current signal collector, 16. current signal converter, 17. fourth resistance, 18. test tube body , 19. The first resistance connection point, 20. The second resistance connection point, 21. The third resistance connection point, 22. The fourth resistance connection point, 23. The first resistance, 24. The second resistance.

A portable multi-depth on-site measurement device for permeability coefficient, comprising a steel pipe main body 6, characterized in that: the steel pipe main body 6 is a telescopic structure, composed of hollow steel pipes that are connected to each other at the front and back; The steel pipe 12 is provided with a detachable instrument panel 1. The instrument panel 1 is equipped with a timer 5 and a current signal converter 16; Composed with the test tube body 18, the pile head 10 is detachably connected with the test tube body 18 through threads; the side wall of the test tube body 18 is provided with a through hole 8, and the through hole 8 is provided with There is a filter screen cover 9; the steel pipe main body 6 is provided with a water level current signal collector, and the water level current signal collector 15 consists of resistors connected in series in sequence, a power supply, a power switch 3, an ammeter 4, and a current signal collector 15. The sealed water tank 7 is composed of wires 13 in series. The sealed water tank 7 is arranged between the through hole 8 and the pile head 10; the through hole 8 is provided with a conduit to communicate with the sealed water tank 7, and the sealed water tank 7 The bottom end is provided with a drain switch, and the sealed tank 7 is provided with a first resistance connection point 19, a second resistance connection point 20, a third resistance connection point 21 and a fourth resistance connection point 22 from bottom to top. Resistors are electrically connected between the adjacent resistor connection points, and from bottom to top are the first resistor 23, the second resistor 24, the third resistor 14 and the fourth resistor 17, and the other end of the fourth resistor 17 Electrically connected with the power supply; the current change signal collected by the current signal collector 15 is transmitted to the current signal converter 16, and the current signal converter 16 converts the current change signal into a timing trigger signal to trigger the timer 5 to read simultaneously time data.

The power supply, power switch 3 , ammeter 4 , first resistor 23 , second resistor 24 , third resistor 14 and fourth resistor 17 are arranged in the dashboard 1 .

The wire 13 is a waterproof wire.

Adjacent hollow steel pipes can be fixedly connected by threads.

The inner wall of the hollow steel pipe is provided with a steel pipe shield 11 at the end away from the pile head 10, and the steel pipe shield 11 is in the shape of a ring.

The sealed tank 7 is made of plastic.

A waterproof tape is provided at the joint between the pile head 10 and the test pipe body 18 .

A pad 2 is provided at the end of the first steel pipe 12 .

Set the distance between every two adjacent resistance connection points as h, and the cross-sectional area of the sealed water tank 7 as S.

When working, close the power switch 3, after _t0 time, the water level in the sealed water tank 7 reaches the first resistance connection point 19, the circuit is connected, the first resistance 23, the second resistance 24, the third resistance 14 and the fourth resistance The resistance 17 starts to work, the ammeter 4 starts to have a reading, the current signal converter 16 transmits the signal transmitted by the current signal collector 15 to the timer 5, and the timer 5 starts to work.

As the seepage water in the sealed water tank 7 increases, the water level of the sealed water tank 7 begins to rise, and a resistor is short-circuited for every rising height h, the current of the circuit changes, and the timer 5 records the time points t ₁ and t ₂ of the current change, ...,t _n , define Δt as the difference between two adjacent time points.

The permeability coefficient is calculated according to the obtained data, and the permeability coefficient of each stage can be obtained separately

Calculate the average permeability coefficient

The embodiments described above are only preferred embodiments for fully illustrating the patent of the present invention, and the protection scope of the patent is not limited thereto. All equivalent substitutions or transformations made by those skilled in the art on the basis of this patent are within the protection scope of this patent. The scope of protection of this patent shall be determined by the claims.

Claims (8)

1. A portable multi-depth permeability coefficient on-site measuring device, comprising a steel pipe main body (6), is characterized in that: the described steel pipe main body (6) is a telescopic structure, and is made up of hollow steel pipes that are socketed together before and after; A detachable instrument panel (1) is provided on the outermost first steel pipe (12), and a timer (5) and a current signal converter (16) are housed in the described instrument panel (1); The innermost steel pipe is a test tube, and the test tube is composed of a pile head (10) and a test pipe body (18), and the pile head (10) is detachably connected to the test pipe body (18) by threads; The side wall of the test pipe body (18) is provided with a through hole (8), and the filter screen cover (9) is provided in the described through hole (8); the water level is provided in the described steel pipe body (6). A current signal collector (15), the water level current signal collector is passed through successively connected resistors, power supplies, power switches (3), ammeters (4), current signal collectors (15), and sealed water tanks (7) Wires (13) are connected in series, and the sealed water tank (7) is located between the through hole (8) and the pile head (10); the through hole (8) is provided with a conduit to communicate with the sealed water tank (7), The bottom of the sealed water tank (7) is provided with a drain switch, and the sealed water tank (7) is provided with a first resistance connection point (19), a second resistance connection point (20), a third resistance connection point from bottom to top. Resistor connection point (21) and the 4th resistance connection point (22), the resistance is electrically connected between the adjacent resistance connection point, and from bottom to top are the first resistance (23), the second resistance (24), the first resistance Three resistors (14) and the fourth resistor (17), the other end of the fourth resistor (17) is electrically connected to the power supply; the current change signal collected by the current signal collector (15) is transmitted to the current signal conversion device (16), the current signal converter (16) converts the current change signal into a timing trigger signal to trigger the timer (5) to read the time data simultaneously; Set the distance between every two adjacent resistance connection points as h, and the cross-sectional area of the sealed tank (7) as S; During work, close power switch (3), after passing through _t0 time, the water level in the sealed tank (7) reaches the first resistance connection point (19), and the circuit is connected, and the first resistance (23), the second resistance ( 24), the 3rd resistor (14) and the 4th resistor (17) start work, ammeter (4) begins to have reading, and current signal converter (16) passes the signal that current signal collector (15) transmits to timer ( 5), the timer (5) starts working; As the seepage water in the sealed water tank (7) increases, the water level of the sealed water tank (7) begins to rise, and a resistor is shorted for each rising height h, the current of the circuit changes, and the timer (5) records the time point when the current changes t ₁ ,t ₂ ,...,t _n , define Δt as the difference between two adjacent time points; The permeability coefficient of each stage can be obtained by calculating the permeability coefficient according to the acquired data. 2. The portable multi-depth permeability coefficient on-site measuring device according to claim 1, characterized in that: the power supply, the power switch (3), the ammeter (4), the first resistor (23), and the second resistor (24) , the third resistor (14) and the fourth resistor (17) are arranged in the instrument panel (1). 3. The portable multi-depth permeability field measuring device according to claim 1, characterized in that: the wire (13) is a waterproof wire. 4. The portable multi-depth permeability coefficient on-site measuring device according to claim 1, characterized in that: adjacent hollow steel pipes can be fixedly connected by threads. 5. The portable multi-depth permeability coefficient on-site measuring device according to claim 4 is characterized in that: the inner wall of the hollow steel pipe is provided with a steel pipe barrier (11) at the end far away from the pile head (10), and the steel pipe barrier (11) is (11) is circular. 6. The portable multi-depth permeability coefficient on-site measuring device according to claim 1, characterized in that: the sealed water tank (7) is made of plastic. 7. The portable multi-depth on-site measurement device for permeability coefficient according to claim 1, characterized in that: a waterproof tape is provided at the connection between the pile head (10) and the test pipe body (18). 8. The portable multi-depth on-site measurement device for permeability coefficient according to claim 1, characterized in that: the end of the first steel pipe (12) is provided with a pad (2).

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