CN208140536U - A kind of falling head permeameter - Google Patents
A kind of falling head permeameter Download PDFInfo
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- CN208140536U CN208140536U CN201820711564.XU CN201820711564U CN208140536U CN 208140536 U CN208140536 U CN 208140536U CN 201820711564 U CN201820711564 U CN 201820711564U CN 208140536 U CN208140536 U CN 208140536U
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- soil
- rubber membrane
- containing tube
- falling head
- braced frame
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Abstract
The utility model discloses a kind of falling head permeameters, including permeability vessel, measurement pipe and water supply device, are connected between permeability vessel and measurement pipe and water supply device by pipeline；Permeability vessel includes pedestal, soil-containing tube, braced frame, upper press cover and pressurization screw rod, the upper and lower ends of soil-containing tube are separately positioned on inside pedestal and upper press cover, braced frame is mounted on the base, braced frame is equipped with crossbeam, the center of crossbeam is equipped with threaded hole, and pressurization screw rod is connect by threaded hole with the crossbeam in braced frame；The inner wall of soil-containing tube is equipped with rubber membrane, and the outer wall of rubber membrane is equipped with air intake duct, and the end of rubber membrane is equipped with the edge of a wing of protrusion, and rubber membrane is glued by the edge of a wing and soil-containing tube.The utility model has the beneficial effects that rubber membrane is located at the inner wall of soil-containing tube, air-breathing makes rubber membrane tightly be overlying on soil-containing tube inner wall, and after sample is put into soil-containing tube, the rebound effect of rubber membrane tightly wraps up sample, gap effectively between sealing sample and cutting ring, improves the accuracy of test result.
Description
Technical field
The utility model belongs to soil test technique field, more particularly, to a kind of falling head permeameter.
Background technique
Infiltration coefficient is the important indicator for reflecting native penetrating power, and permeability test is the important side for measuring native infiltration coefficient
Method is the important component of soil test.Currently, generalling use varying head infiltration examination for fine grained soil (clay and silt)
It tests, principle is will to form soil sample to be installed on permeability vessel, and stand one end time under certain head pressure, is recorded simultaneously
The variation of head.Although the test method principle is simple, during the test, the accuracy of test result is not high.
Currently, sample used generallys use core cutter method acquisition in variable head permeability test, sample preparation principle is that cutting ring hangs down
Vertical compression enters soil sample, after the soil sample at cutting ring both ends is struck off, is put into permeability vessel together together with cutting ring, although this method can be quick
Sample preparation, but sample lower for intensity, easily skid off from cutting ring, and can cause sample in moving process during the installation process
Deformation, leads between sample and cutting ring inner wall that there are gaps.When for silt sample preparation, it may cause and generate splitting for perforation inside sample
Gap, and then seriously affect the accuracy of experimental result.
It is disclosed in the patent document of Patent No. ZL201620310606X, in order to improve test result accuracy,
Cutting ring inner wall smears vaseline thin layer, sandwiches the cylindrical sample cut in advance, and is squeezed in insertion block set together, and vaseline has
Gap, which reaches, between effect filling cutting ring and sample prevents infiltration water flow " side leakage " or " water flow short circuit " purpose, but its effect one
As, test result poor accuracy.
Utility model content
That the purpose of the utility model is to provide a kind of structures is simple, easy to operate, test result accuracy is high, error is small
Falling head permeameter.
The technical solution of the utility model is as follows：
A kind of falling head permeameter, including permeability vessel, measurement pipe and water supply device, the permeability vessel and measurement pipe and
It is connected between water supply device by pipeline；
The permeability vessel include pedestal, soil-containing tube, braced frame, upper press cover and pressurization screw rod, the soil-containing tube it is upper
Lower both ends are separately positioned on inside pedestal and upper press cover, and the braced frame is mounted on the base, and the braced frame is equipped with
Crossbeam, the center of the crossbeam are equipped with threaded hole, and the pressurization screw rod is connected by the crossbeam on threaded hole and the braced frame
It connects；
The inner wall of the soil-containing tube is equipped with rubber membrane, and the outer wall of the rubber membrane is equipped with air intake duct, the end of the rubber membrane
Portion is equipped with the edge of a wing of protrusion, and the rubber membrane is glued by the edge of a wing and soil-containing tube.
Further, the pedestal is equipped with annular protrusion, and the upper surface of the annular protrusion is equipped with the first undergauge ladder, institute
The side for stating pedestal is equipped with water inlet pipe, is equipped with the first groove for holding round permeable stone in the annular protrusion, and described the
The bottom centre of one groove is equipped with the limbers being connected to water inlet pipe.
Further, the height of first groove is equal to the height of round permeable stone.
Further, interior the second groove being equipped with for holding round permeable stone of the upper press cover, the one of second groove
Side is equipped with drainpipe.
Further, the internal diameter of second groove and height are all larger than the outer diameter and height of round permeable stone.
Further, the upper surface of the soil-containing tube be equipped with the second undergauge ladder, the internal diameter of the second undergauge ladder with it is upper
The outer diameter of gland is equal.
Further, the rubber membrane with a thickness of 1mm, the flange width of the rubber membrane end is 5mm.
Further, the pvc material of the rubber membrane.
Further, the outer wall of the measurement pipe is equipped with level scale.
Further, the pipeline of the water supply device, measurement pipe and permeability vessel connection is equipped with valve.
The utility model has the advantages and positive effects of：Due to the adoption of the above technical scheme, rubber membrane setting is being contained
The inner wall of native cylinder makes rubber membrane tightly be overlying on soil-containing tube inner wall by air-breathing, after sample is put into soil-containing tube, the rebound effect of rubber membrane
Sample is tightly wrapped up, the gap between sample and cutting ring is effectively sealed, improves the accuracy of test result.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the falling head permeameter of the utility model；
Fig. 2 is the A-A sectional view of the utility model.
In figure：
1, permeability vessel 2, measurement pipe 3, water supply device
4, pedestal 5, soil-containing tube 6, braced frame
7, upper press cover 8, pressurization screw rod 9, rubber membrane
10, air intake duct 11, the edge of a wing 12, annular protrusion
13, water inlet pipe 14, round permeable stone 15, the first groove
16, limbers 17, the second groove 18, drainpipe
Specific embodiment
The utility model is described in further detail below in conjunction with specific embodiment.It should be appreciated that described herein
Specific embodiment is used only for explaining the utility model, is not used to limit the utility model, is never limited in the utility model
Protection scope.
Embodiment 1
As shown in Figure 1 and Figure 2, the falling head permeameter of the utility model, including permeability vessel 1, measurement pipe 2 and the dress that supplies water
3 are set, permeability vessel 1 includes pedestal 4, soil-containing tube 5, braced frame 6, upper press cover 7 and pressurization screw rod 8, is connected on the screw rod 8 that pressurizes
Handle, the upper and lower ends of soil-containing tube 5 are separately positioned on the inside of pedestal 4 and upper press cover 7, and braced frame 6 is mounted on the two of pedestal 4
Side.Pedestal 4 is equipped with water inlet pipe 13, and the side of upper press cover 7 is equipped with drainpipe 18, and pedestal 4 is equipped with annular protrusion 12, convex annular
The upper surface for playing 12 is equipped with the first undergauge ladder, and the height of the first undergauge ladder is equal with the round height of permeable stone 14, in ring
The bottom of shape protrusion 12 is equipped with the first groove 15, is equipped with the limbers being connected to water inlet pipe 13 in the bottom centre of the first groove 15
16, it supplies water for water supply device 3 into permeability vessel 1；It is equipped in upper press cover 7 recessed for holding the second of round permeable stone 14
Slot 17, the cavity inside diameter and height of the second groove 17 are greater than the outer diameter and height of round permeable stone 14,；Second groove 17 and draining
Pipe 18 is connected to, and is flowed out convenient for water by drainpipe 18；
Braced frame 6 includes support rod and crossbeam, and crossbeam is nested at the top of support rod, and the center of crossbeam is equipped with screw thread
Hole, pressurization screw rod 8 are connect by threaded hole with crossbeam, and pressure is passed to upper press cover 7 by pressurization screw rod.Soil-containing tube 5
Inner wall is equipped with rubber membrane 9, and the outer wall of rubber membrane 9 is equipped with the air intake duct 10 for drawing air in rubber membrane 9, and air intake duct 10 is worn
Soil-containing tube 5 is crossed, the end of rubber membrane 9 is equipped with the edge of a wing 11 of protrusion, the edge of a wing 11 and 5 glued seals of soil-containing tube.The upper end of soil-containing tube 5
Face is equipped with the second undergauge ladder, and the internal diameter of the second undergauge ladder is equal with the outer diameter of upper press cover 7.
Embodiment 2
When on the basis of embodiment 1, using the falling head permeameter of the utility model, specific step is as follows：
(1) sample is prepared with cutting ring；
(2) round permeable stone 14 is put into the second groove 17 of pedestal 4, soil-containing tube 5 is placed into annular protrusion later
On 12；
(3) with the air intake duct 10 of water suction ball alignment soil-containing tube 5, the air in rubber membrane 9 is sucked out, so that rubber membrane 9 is tight
It is overlying on the inner wall of soil-containing tube 5；
(4) by the sample push-in permeability vessel 1 in cutting ring, water suction ball is removed, the rebound of rubber membrane 9 tightly wraps sample
It wraps up in；
(5) round permeable stone 14 is put into the second groove 17 in upper press cover 7, and is put into the top of soil-containing tube 5 together,
After covering upper press cover 7, pressurization screw rod 8 is turned, tight closure between soil-containing tube 5 and upper press cover 7, pedestal 4 is made；
(6) water supply device 3 supplies water into permeability vessel 1, the air in permeability vessel 1 is discharged, and record in measurement pipe 2
Change of water level obtains corresponding measurement data.
Embodiment 3
On the basis of embodiment 1, further rubber membrane 9 uses pvc material, with a thickness of 1mm, 9 end of rubber membrane
Portion is equipped with the edge of a wing 11, and the width on the edge of a wing 11 is 5mm, and the inside splicing on the edge of a wing 11 and soil-containing tube 5 guarantees rubber membrane 9 and soil-containing tube
It fits closely, guarantees that gap is not present between sample and the inner wall of soil-containing tube 5, so that moisture directly passes through permeability vessel 1 and surveyed
Amount test, effectively improves the accuracy of test result.
One embodiment of the utility model is described in detail above, but the content is only the utility model
Preferred embodiment should not be considered as limiting the scope of the present invention.It is all to be made according to application scope of the utility model
Equivalent variations and improve etc., should still belong within the patent covering scope of the utility model.
Claims (10)
1. a kind of falling head permeameter, it is characterised in that：It is described including permeability vessel (1), measurement pipe (2) and water supply device (3)
It is connect between permeability vessel (1) and measurement pipe (2) and water supply device (3) by pipeline；
The permeability vessel (1) includes pedestal (4), soil-containing tube (5), braced frame (6), upper press cover (7) and pressurizes screw rod (8),
The upper and lower ends of the soil-containing tube (5) are separately positioned on pedestal (4) and upper press cover (7) is internal, and the braced frame (6) is mounted on
On pedestal (4), the braced frame (6) is equipped with crossbeam, and the center of the crossbeam is equipped with threaded hole, the pressurization screw rod (8)
It is connect by threaded hole with the crossbeam on the braced frame (6)；
The inner wall of the soil-containing tube (5) is equipped with rubber membrane (9), and the outer wall of the rubber membrane (9) is equipped with air intake duct (10), the rubber
The end of glue film (9) is equipped with the edge of a wing (11) of protrusion, and the rubber membrane (9) is glued by the edge of a wing (11) and soil-containing tube (5).
2. falling head permeameter according to claim 1, it is characterised in that：The pedestal (4) is equipped with annular protrusion
(12), the upper surface of the annular protrusion (12) is equipped with the first undergauge ladder, and the side of the pedestal (4) is equipped with water inlet pipe
(13), the first groove (15) for holding round permeable stone (14), first groove are equipped in the annular protrusion (12)
(15) bottom centre is equipped with the limbers (16) being connected to water inlet pipe (13).
3. falling head permeameter according to claim 2, it is characterised in that：The height of first groove (15) is equal to circle
The height of shape permeable stone (14).
4. falling head permeameter according to claim 1, it is characterised in that：It is equipped in the upper press cover (7) for holding
The side of the second groove (17) of round permeable stone (14), second groove (17) is equipped with drainpipe (18).
5. falling head permeameter according to claim 4, it is characterised in that：The internal diameter and height of second groove (17)
It is all larger than the outer diameter and height of round permeable stone (14).
6. falling head permeameter according to claim 1, it is characterised in that：The upper surface of the soil-containing tube (5) is equipped with the
The internal diameter of two undergauge ladders, the second undergauge ladder is equal with the outer diameter of upper press cover (7).
7. falling head permeameter described in any one of -6 according to claim 1, it is characterised in that：The rubber membrane (9)
With a thickness of 1mm, the flange width of rubber membrane (9) end is 5mm.
8. falling head permeameter according to claim 7, it is characterised in that：The pvc material of the rubber membrane (9).
9. falling head permeameter according to claim 7, it is characterised in that：The outer wall of the measurement pipe (2) is equipped with water
Position scale.
10. falling head permeameter according to claim 7, it is characterised in that：The water supply device (3), measurement pipe (2) with
The pipeline of permeability vessel (1) connection is equipped with valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820711564.XU CN208140536U (en) | 2018-05-14 | 2018-05-14 | A kind of falling head permeameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820711564.XU CN208140536U (en) | 2018-05-14 | 2018-05-14 | A kind of falling head permeameter |
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| Publication Number | Publication Date |
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| CN208140536U true CN208140536U (en) | 2018-11-23 |
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| CN201820711564.XU Active CN208140536U (en) | 2018-05-14 | 2018-05-14 | A kind of falling head permeameter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900599A (en) * | 2019-04-16 | 2019-06-18 | 盾构及掘进技术国家重点实验室 | A kind of method slurry penetration film forming experimental provision and its measure slurry penetration performance |
-
2018
- 2018-05-14 CN CN201820711564.XU patent/CN208140536U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900599A (en) * | 2019-04-16 | 2019-06-18 | 盾构及掘进技术国家重点实验室 | A kind of method slurry penetration film forming experimental provision and its measure slurry penetration performance |
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