CN209802929U - constant head soil permeability coefficient measuring device - Google Patents
constant head soil permeability coefficient measuring device Download PDFInfo
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- CN209802929U CN209802929U CN201920247112.5U CN201920247112U CN209802929U CN 209802929 U CN209802929 U CN 209802929U CN 201920247112 U CN201920247112 U CN 201920247112U CN 209802929 U CN209802929 U CN 209802929U
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Abstract
The utility model provides a constant head soil permeability coefficient measuring device, including test support, the water tank, the test section of thick bamboo, the mesh, the basin and water containing device, store water in the water tank, place the soil body that awaits measuring in the test section of thick bamboo, the water tank is located the top of test section of thick bamboo, the test section of thick bamboo is placed on the test support, the test section of thick bamboo, mesh and basin top-down connect gradually, water containing device is located the below of basin, the test section of thick bamboo includes test section of thick bamboo upper portion and test section of thick bamboo lower part, the upper and lower extreme of test section of thick bamboo upper portion and test section of thick bamboo lower part is all uncovered, set up a plurality of spillway holes on the section of thick bamboo wall on test section of thick bamboo upper portion, the upper end of mesh is uncovered, the lower extreme of mesh is sealed and is seted up a plurality of apertures, place the spillway stone in the mesh, the, then flows into the water tank and then flows into the water containing device, and the permeability coefficient of the soil body to be measured is calculated according to the water quantity in the water containing device.
Description
Technical Field
the utility model relates to a geotechnical test technical field especially relates to a constant head soil permeability coefficient survey device.
Background
The permeability coefficient is a quantitative index for representing the soil permeability, is a basic parameter which must be used when the seepage calculation is carried out, and has important effects on the aspects of soil improvement treatment, various underground engineering constructions and the like. At present, the soil permeameter is divided into a constant head type and a variable head type, a constant head test is suitable for measuring the permeability coefficient of sandy soil with high water permeability, and a variable head test is suitable for measuring the permeability coefficient of cohesive soil with low water permeability. The normal water head method or the variable water head method is measured in a laboratory, and can affect the water content, the quality and the structure of soil to a certain extent in the transportation process of a cutting ring cylinder sample, so that larger errors are caused. Although the measured permeability coefficient value of the traditional test method for field well pumping or well water injection is reliable, the traditional test method damages the surface soil body, cannot accurately measure the permeability coefficient of the soil containing the surface soil, and has higher cost and longer time. Therefore, if the test device capable of measuring the soil permeability coefficient by using the permeability cylinder at the in-situ point is provided under the condition of reducing the soil disturbance, the transport cost and the disturbance error are reduced while the accuracy of the soil permeability coefficient is increased.
Disclosure of Invention
In view of this, the utility model provides a simple structure, can effectively reduce the constant head soil permeability coefficient survey device of disturbance error.
The utility model provides a constant head soil permeability coefficient measuring device, which comprises a test support, a water tank, a test cylinder, a mesh, a water tank and a water containing device, wherein water is stored in the water tank, a soil body to be measured is placed in the test cylinder, the water tank is positioned above the test cylinder, the test cylinder is placed on the test support, the test cylinder, the mesh and the water tank are sequentially connected from top to bottom, the water containing device is positioned below the water tank, the test cylinder comprises a test cylinder upper part and a test cylinder lower part which are connected by screw threads, the upper end and the lower end of the test cylinder upper part and the test cylinder lower part are both open, a plurality of overflow holes which are arranged at equal intervals are arranged on the cylinder wall of the test cylinder upper part, the upper end of the mesh is open, the lower end of the mesh is closed and is provided with a plurality of small holes, permeable stones are placed in the mesh, the upper end of, and after the water in the water tank flows into the test cylinder, part of the water flows out through the overflow hole, and part of the water flows through the soil body to be detected to generate permeation and then flows into the water tank and then flows into the water containing device, and the permeation coefficient of the soil body to be detected is calculated according to the water quantity in the water containing device.
Further, the normal water head soil permeability coefficient survey device still includes to revolve wrong pole lid, revolve wrong pole lid and include the lid and revolve wrong pole, the lower extreme of lid and the upper end screw-thread fit on a test section of thick bamboo upper portion, be equipped with the cross hole post on the lid, be equipped with vertical hole on the cross hole post, revolve wrong pole including revolving wrong pole straight-bar and revolving wrong pole chassis, revolve wrong pole straight-bar pass vertical hole and with vertical hole screw-thread fit, the bottom of revolving wrong pole straight-bar is globular curved surface, be close to the bottom department of revolving wrong pole straight-bar and be equipped with and revolve wrong pole straight-bar fixed connection's first ring, revolve the top on wrong pole chassis and connect the second ring, the second ring is passed to the bottom of revolving pole straight-bar, the internal diameter of second ring is greater than and revolves the external diameter of wrong pole straight-bar and is less than the.
further, the calculation formula of the permeability coefficient of the soil body to be detected is as follows:
kT＝Q(L2-L1)/(AHt)
In the formula, kTthe permeability coefficient of the soil body to be measured; q is the water quantity in the water containing device; a is the internal cross-sectional area of the test cylinder; h is the height from the overflow hole to the bottom of the soil sample; t is time; l is1For screwing the lower end of the rod chassis and the lower part of the test cylinderWhen the opening is level, the straight rod of the screw rod is screwed by the length outside the test cylinder; l is2When the base plate of the screwing rod is just contacted with the upper part of the soil body, the length of the straight rod of the screwing rod outside the test cylinder is shortened.
further, the constant head soil permeability coefficient measuring device further comprises an auxiliary soil sampling cylinder, the upper end and the lower end of the auxiliary soil sampling cylinder are open, the inner diameter of the auxiliary soil sampling cylinder is consistent with the inner diameter of the upper portion of the test cylinder, and the lower end of the auxiliary soil sampling cylinder is in threaded fit with the upper end of the upper portion of the test cylinder.
Further, the constant head soil permeability coefficient measuring device further comprises a ring cutter cylinder, the upper end and the lower end of the ring cutter cylinder are open, the inner diameter of the ring cutter cylinder is consistent with the inner diameter of the lower portion of the test cylinder, the upper end of the ring cutter cylinder is in threaded fit with the lower end of the lower portion of the test cylinder, and a cutting edge is arranged at the lower end of the ring cutter cylinder.
furthermore, the test support comprises a test support cylinder and three test support legs, the test support legs are hinged to the test support cylinder, the upper end and the lower end of the test support cylinder are open, a first notch and a second notch are formed in the upper end of the test support cylinder, a first pedal and a second pedal are arranged on the cylinder wall of the lower portion of the test cylinder, the shape of the first pedal is matched with that of the first notch, the shape of the second pedal is matched with that of the second notch, the first pedal is clamped on the first notch, and the second pedal is clamped on the second notch.
Furthermore, a water tank water outlet is formed in the side wall of the water tank and connected with a first rubber pipe, and the water outlet end of the first rubber pipe extends into the test cylinder.
furthermore, a water tank water outlet is formed in the side wall of the water tank and connected with a third rubber pipe, and the water outlet end of the third rubber pipe extends into the water containing device.
Further, the constant head soil permeability coefficient measuring device still includes and hits real support, hit real support and include bottom plate and two vertical poles, two vertical poles fixed connection respectively in the top of bottom plate, all set up a horizontal pin hole on every vertical pole, insert the support pin in the horizontal pin hole, still be equipped with the horizontal hole on the cross hole post, horizontal hole and support pin screw-thread fit.
furthermore, the second circular ring is connected with the screwing rod base plate through three circular ring supports, one end of each circular ring support is connected to the screwing rod base plate, and the other end of each circular ring support is connected with the second circular ring.
The utility model provides a beneficial effect that technical scheme brought is:
1. The constant head soil permeability coefficient measuring device provided by the utility model has good adaptability to terrain placement, can perform test operation on uneven terrain, and overcomes the problem that most existing permeability coefficient measuring devices have high requirements on placement sites;
2. The utility model can measure the permeability coefficient of the soil body under the conditions of effectively avoiding disturbance to the soil body and damage to the surface soil and the soil covering layer by matching the screwing rod cover, the test cylinder, the mesh, the water tank and the water containing device, thereby leading the result of the measured permeability coefficient to be closer to the true value of the original soil;
3. The utility model can simply measure the permeability coefficient of the laboratory proportioning soil under the requirement of certain porosity through the compaction device;
4. The utility model discloses thereby can change the water conservancy slope of constant head and fall and carry out the accuracy of multiunit test in order to improve the result under the condition of not changing the soil body.
Drawings
Fig. 1 is the structure schematic diagram of the constant head soil permeability coefficient measuring device of the utility model.
Fig. 2 is a schematic view of the connection of the test cylinder, the mesh and the water tank of the constant head soil permeability coefficient measuring device of the utility model.
fig. 3 is the utility model discloses a constant head soil permeability coefficient survey device's mesh and a test section of thick bamboo complex structure sketch map.
Fig. 4 is the utility model discloses a constant head soil permeability coefficient survey device's supplementary geotome, a test section of thick bamboo and a cutting ring section of thick bamboo complex schematic structure.
Fig. 5 is the utility model discloses a constant head soil permeability coefficient survey device's supplementary geotome, a test section of thick bamboo and a cutting ring section of thick bamboo complex decomposition schematic diagram.
fig. 6 is a schematic structural diagram of the compaction support of the constant head soil permeability coefficient measuring device of the present invention.
Fig. 7 is a schematic structural diagram of a screwing rod cover of the constant head soil permeability coefficient measuring device of the present invention.
Fig. 8 is an enlarged schematic view of a screwing rod chassis of the constant head soil permeability coefficient measuring device of the present invention.
Fig. 9 is a schematic diagram of the test structure of the constant head soil permeability coefficient measuring device for changing the overflow hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be further described below with reference to the accompanying drawings.
Referring to fig. 1 to 8, an embodiment of the present invention provides a constant head soil permeability coefficient measuring device, including a test support 1, a water tank 2, a test cylinder 3, a mesh 4, a water tank 5, a water containing device 6, an auxiliary soil sampling cylinder 7, a ring knife cylinder 8, a screw rod cover 9 and a compaction support 10, the water tank 2 is located above the test cylinder 3, the mesh 4 and the water tank 5 are sequentially connected by screw threads from top to bottom, the test cylinder 3 is placed on the test support 1, and the water containing device 6 is located below the water tank 5.
Test support 1 includes test support drum 11 and three test support landing leg 12, all be provided with landing leg pin 121 on the three test support landing leg 12, can adjust the length of test support landing leg 12 through landing leg pin 121, and three test support landing leg 12 is articulated with test support drum 11 respectively, the upper and lower end of test support drum 11 is uncovered, first breach 111 and second breach 112 have been seted up to the upper end of test support drum 11, first breach 111 and second breach 112 are about the central symmetry of test support drum 11, be equipped with the levelling meter 113 that contains water level bubble on the section of thick bamboo wall of test support drum 11, levelling meter 113 is used for weighing whether test support drum 11 is horizontal.
Water is stored in the water tank 2, a water tank water outlet 21 is formed in the side wall of the water tank 2, the water tank water outlet 21 is connected with a first rubber tube 22, a first water stop clamp 23 is arranged on the first rubber tube 22, and the water outlet end of the first rubber tube 22 extends into the test tube 3.
A soil body is placed in the test cylinder 3, the test cylinder 3 comprises a test cylinder upper part 31 and a test cylinder lower part 32 which are in threaded connection, the sizes of the test cylinder upper part 31 and the test cylinder lower part 32 are consistent, the upper end and the lower end of the test cylinder upper part 31 and the test cylinder lower part 32 are both open, four overflow holes 311 which are arranged at equal intervals are formed in the cylinder wall of the test cylinder upper part 31, overflow hole covers 312 are arranged at the overflow holes 311, a protruding column body which is made of metal materials is arranged in the middle of the overflow hole covers 312, the outer diameter of the protruding column body is the same as the inner diameter of the overflow holes 311, the overflow holes 311 are sealed by placing the protruding column body of the overflow hole covers 312 into the overflow holes 311, and when a normal water head test is carried out, a second rubber pipe 314 with a second water stop clamp 313; the wall of the lower part 32 of the test tube is provided with a first triangular pedal 321 and a second triangular pedal 322, the first pedal 321 and the second pedal 322 are symmetrical about the center of the lower part 32 of the test tube, the shape of the first pedal 321 is matched with that of a first notch 111 on the cylinder 11 of the test support, the shape of the second pedal 322 is matched with that of a second notch 112 on the cylinder 11 of the test support, the test tube 3 is clamped on the cylinder 11 of the test support by clamping the first pedal 321 on the first notch 111 and clamping the second pedal 322 on the second notch 112, and the outer diameter of the lower part 32 of the test tube is the same as the inner diameter of the cylinder 11 of the test support.
Referring to fig. 3, the upper end of the mesh 4 is open, the lower end of the mesh 4 is closed and is provided with a plurality of small holes (not shown), a cylindrical permeable stone 41 is placed in the mesh 4, the diameter of the permeable stone 41 is consistent with the inner diameter of the test cylinder lower part 32, the mesh 4 is of a cylindrical structure, the inner diameter and the wall thickness of the mesh 4 are consistent with the inner diameter and the wall thickness of the test cylinder lower part 32, and the upper end of the mesh 4 is in threaded fit with the lower end of the test cylinder lower part 32.
The upper end of the water tank 5 is open, the lower end of the water tank 5 is closed, the water tank 5 is of a cylindrical structure, the inner diameter and the wall thickness of the water tank 5 are consistent with those of the mesh 4, the upper end of the water tank 5 is in threaded fit with the lower end of the mesh 4, a water tank water outlet 51 is formed in the side wall of the water tank 5, the water tank water outlet 51 is connected with a third rubber pipe 52, a third water stop clamp 53 is arranged on the third rubber pipe 52, the water outlet end of the third rubber pipe 52 extends into the water containing device 6, and the upper end of the water containing device 6 is sealed by a preservative film; in one embodiment, the water container 6 is a measuring cylinder.
referring to fig. 4 and 5, the inner diameter of the auxiliary soil-taking cylinder 7 is the same as the inner diameter of the upper part 31 of the test cylinder, the length of the auxiliary soil-taking cylinder 7 is larger than that of the test cylinder 3, the upper end and the lower end of the auxiliary soil-taking cylinder 7 are open, two handles 71 located on two sides of the diameter line of the cylinder wall are arranged on the cylinder wall of the auxiliary soil-taking cylinder 7, and the lower end of the auxiliary soil-taking cylinder 7 is in threaded fit with the upper end of the upper part 31 of the test cylinder.
Referring to fig. 4 and 5, the annular knife cylinder 8 is of a cylinder structure, the upper end and the lower end of the annular knife cylinder 8 are open, the inner diameter and the wall thickness of the annular knife cylinder 8 are consistent with those of the lower part 32 of the test cylinder, the upper end of the annular knife cylinder 8 is in threaded fit with the lower end of the lower part 32 of the test cylinder, the lower end of the annular knife cylinder 8 is provided with a knife edge, the knife edge is in contact with soil to cut the soil after the annular knife cylinder 8 is stressed, and the cut soil is retained in the lower part 32 of the test cylinder.
Referring to fig. 7 and 8, the screw cap 9 includes a cap body 91 and a screw 92, the lower end of the cap body 91 is in threaded fit with the upper end of the upper portion 31 of the test cartridge, the center of the cap body 91 is opened, the cap body 91 is provided with a cross-shaped hole column 911, the cross-shaped hole column 911 is provided with a vertical hole 912 and a horizontal hole 913 which are communicated with each other, the vertical hole 912 is communicated with the center of the cap body 91, the screw 92 includes a screw straight rod 921 and a screw base plate 922, the upper end of the screw straight rod 921 is provided with a screw knob 923, the screw straight rod 921 passes through the centers of the vertical hole 912 and the cap body 91 and is in threaded fit with the vertical hole 912, the screw straight rod 921 moves up and down in the cross-shaped hole column 911 through the threaded fit, the bottom end of the screw straight rod 921 is spherically curved, a first circular ring 924 integrally connected with the screw 921 is provided near the bottom end of the screw straight rod 921, the second ring 925 is located above the first ring 924, the bottom end of the screw rod straight rod 921 passes through the second ring 925, the inner diameter of the second ring 925 is slightly larger than the diameter of the screw rod straight rod 921 and smaller than the outer diameter of the first ring 924, so that the screw rod straight rod 921 can rotate relative to the screw rod chassis 922 and move up and down relative to the screw rod chassis 922 within a certain range, the screw rod straight rod 921 is limited by the second ring 925 when moving upwards to the highest position, the screw rod straight rod 921 is limited by the screw rod chassis 922 when moving downwards to the lowest position, the second ring 925 and the screw rod chassis 922 are connected through three ring supports 926, one end of each ring support 926 is integrally connected to the screw rod chassis 922, the other end of each ring support 926 is integrally connected with the second ring 925, and the three ring supports 926 use the center point of the screw rod chassis 922 as the center point.
Referring to fig. 6, the tamping support 10 includes a bottom plate 101 and two vertical rods 102, the two vertical rods 102 are respectively and fixedly connected above the bottom plate 101, each vertical rod 102 is provided with a horizontal pin hole 103, a support pin 104 is inserted into the horizontal pin hole 103, and the support pin 104 is in threaded fit with a horizontal hole 913 of the cross-shaped hole column 911.
in order to ensure the tightness of the constant head soil permeability coefficient measuring device, rubber rings are arranged at the positions of threaded connection, and rubber sleeves 24 are arranged at the positions of the water tank water outlet 21, the water tank water outlet 51 and the overflow hole 311.
Utilize the utility model provides a constant head soil permeability coefficient survey device carries out normal position sandy soil constant head when experimental, and the step is:
step S101, sequentially combining an auxiliary soil sampling cylinder 7, an upper test cylinder part 31, a lower test cylinder part 32 and a cutting ring cylinder 8 into a soil sampling device from top to bottom;
Step S102, inserting the soil taking device assembled in the step S101 into a soil body to be tested, inserting the soil body into the soil body to be tested to a certain depth to enable the thickness of the soil body above an upper port line of the annular cutter cylinder 8 to be approximately equal to the thickness of the soil body to be tested, and in the process that the soil taking device is inserted into the soil body to be tested, simultaneously treading the first pedal 321 and the second pedal 322 or putting heavy objects with equal weight on the first pedal 321 and the second pedal 322 to enable the first pedal 321 and the second pedal 322 to be stressed equally, so that the integrity of sampling can be effectively guaranteed, and the original structure and composition are effectively reserved; when the soil thickness above the upper port line of the ring cutter cylinder 8 is about the soil thickness to be tested, stopping stepping on the first pedal 321 and the second pedal 322 or unloading the heavy objects on the first pedal 321 and the second pedal 322, and simultaneously reducing the rotation of the test cylinder 3 as much as possible;
Step S103, taking down the auxiliary soil taking barrel 7, installing a screwing rod cover 9 on the upper portion 31 of the test barrel, screwing a screwing rod straight rod 921 through a screwing rod knob 923 to enable a screwing rod base plate 922 to be in right contact with the upper portion of a soil body, measuring to obtain the length of the screwing rod straight rod 921 outside the test barrel 3, and recording the length as L2；
Step S104, digging the soil around the soil taking device, cutting the soil below the annular cutter cylinder 8 by using an iron sheet or a soil cutting sheet, and supporting the iron sheet and the annular cutter cylinder 8 by hands to slowly invert to be horizontal;
Step S105, taking down the cutting ring barrel 8, cutting the soil body parallel to the lower port of the lower part 32 of the test barrel to enable the section to be flush with the lower port of the lower part 32 of the test barrel, and then connecting the hole net 4 filled with the permeable stones 41;
Step S106, leveling the test bracket 1 by using a leveling gauge 113, placing the test cylinder 3 filled with soil on the test bracket 1, connecting a water tank 5 to the lower end of a mesh 4, placing a measuring cylinder below the water tank 5, and sealing the measuring cylinder by using a preservative film;
Step S107, taking down the screw rod cover 9, and if the taken soil body has no covering layer substances, paving a gravel layer on the surface layer of the soil body;
step S108, placing the water tank 2 at a proper position of the upper part 31 of the test cylinder, and enabling the bottom of the water tank 2 to be slightly higher than the upper port of the upper part 31 of the test cylinder;
step S109, connecting a first rubber pipe 22 to a water outlet 21 of the water tank, connecting a second rubber pipe 314 to a lowest overflow hole 311, sealing other overflow holes 311 by using overflow hole covers 312, connecting a third rubber pipe 52 to a water outlet 51 of the water tank, adjusting the distance, opening a first water stop clamp 23, a second water stop clamp 313 and a third water stop clamp 53, and enabling water in the water tank 2 to flow through the test cylinder 3, the hole net 4 and the water tank 5 in sequence and then flow out of the measuring cylinder;
Step S110, adjusting the proper water quantity to ensure that the water quantity entering the test cylinder 3 is always larger than the water outlet quantity of the overflow hole 311 and the water level in the test cylinder 3 is unchanged;
Step S111, measuring the water quantity Q in the measuring cylinder and the temperature T of the water within a certain time T;
Step S112, calculating the permeability coefficient kTCoefficient of permeability kTthe calculation formula of (2) is as follows:
kT＝Q(L2-L1)/(AHt)
Wherein A is the internal cross-sectional area of the test cylinder 3, H is the height of the overflow hole 311 from the bottom of the soil sample, and L1when the screw rod base plate 922 is flush with the lower port of the lower part 32 of the test cylinder, the screw rod straight rod 921 is located at the length outside the test cylinder 3;
Step S113, changing the position of the overflow holes 311, referring to fig. 9, connecting a second rubber tube 314 to the selected second overflow hole 311, repeating the steps S110-S112 for a plurality of times (generally 5-6 times), and ending the test when the permeability coefficient difference measured for a plurality of times is within the error tolerance.
Utilize the utility model provides a constant head soil permeability coefficient survey device when carrying out the constant head test of laboratory ratio sand, the step is:
Step S201, connecting the upper part 31 of the test cylinder, the lower part 32 of the test cylinder and the mesh 4 from top to bottom in sequence;
Step S202, calculating the volume of the filled soil body when the filled soil body is pressed into the required pore ratio, and converting the volume into the height of the soil body in the test tube 3;
step S203, loading the assembled quantitative soil body into the test cylinder 3, covering the screwing rod cover 9, and connecting the screwing rod cover 9 with the compaction support 10;
Step S204, screwing the straight screw rod 921, obtaining the height of the soil body by measuring the length of the straight screw rod 921 outside the cover 91, extruding the soil body to the calculated height, placing for a certain time to enable the height to be stable, measuring the length of the straight screw rod 921 outside the test tube 3, and recording as L2；
Step S205, the test cylinder 3 is taken down from the compaction support 10, the screw rod cover 9 is taken down, then the test cylinder 3 is placed on the leveled test support 1, the water tank 5 is connected, and then the test and the calculation of the permeability coefficient are carried out according to the steps S108 to S113.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
the above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. The constant head soil permeability coefficient measuring device is characterized by comprising a test support, a water tank, a test cylinder, a mesh, a water tank and a water containing device, wherein water is stored in the water tank, a soil body to be measured is placed in the test cylinder, the water tank is positioned above the test cylinder, the test cylinder is placed on the test support, the test cylinder, the mesh and the water tank are sequentially connected from top to bottom, the water containing device is positioned below the water tank, the test cylinder comprises an upper part of the test cylinder and a lower part of the test cylinder which are connected through threads, the upper end and the lower end of the upper part and the lower part of the test cylinder are both open, a plurality of overflow holes which are arranged at equal intervals are formed in the cylinder wall of the upper part of the test cylinder, the upper end of the mesh is open, the lower end of the mesh is closed and provided with a plurality of small holes, permeable stones are placed in the mesh, the upper end, and after the water in the water tank flows into the test cylinder, part of the water flows out through the overflow hole, and part of the water flows through the soil body to be detected to generate permeation and then flows into the water tank and then flows into the water containing device, and the permeation coefficient of the soil body to be detected is calculated according to the water quantity in the water containing device.
2. The constant head soil permeability coefficient measuring device according to claim 1, the constant head soil permeability coefficient measuring device also comprises a screwing rod cover, the screwing rod cover comprises a cover body and a screwing rod, the lower end of the cover body is in threaded fit with the upper end of the upper part of the test cylinder, a cross-shaped hole column is arranged on the cover body, the cross-shaped hole column is provided with a vertical hole, the screwing rod comprises a screwing rod straight rod and a screwing rod base plate, the rotating rod straight rod penetrates through the vertical hole and is in threaded fit with the vertical hole, the bottom end of the rotating rod straight rod is a spherical curved surface, a first circular ring fixedly connected with the rotating rod straight rod is arranged at the position close to the bottom end of the rotating rod straight rod, the upper part of the screwing rod base plate is connected with a second circular ring, the bottom end of the straight rod of the screwing rod passes through the second circular ring, the inner diameter of the second circular ring is larger than the diameter of the straight rod of the screwing rod and smaller than the outer diameter of the first circular ring.
3. The constant head soil permeability coefficient measuring device according to claim 1, further comprising an auxiliary soil sampling cylinder, wherein the upper end and the lower end of the auxiliary soil sampling cylinder are open, the inner diameter of the auxiliary soil sampling cylinder is consistent with the inner diameter of the upper part of the test cylinder, and the lower end of the auxiliary soil sampling cylinder is in threaded fit with the upper end of the upper part of the test cylinder.
4. The constant head soil permeability coefficient measuring device according to claim 1, further comprising a ring cutter cylinder, wherein the upper end and the lower end of the ring cutter cylinder are open, the inner diameter of the ring cutter cylinder is consistent with the inner diameter of the lower portion of the test cylinder, the upper end of the ring cutter cylinder is in threaded fit with the lower end of the lower portion of the test cylinder, and the lower end of the ring cutter cylinder is provided with a cutting edge.
5. The constant head soil permeability coefficient measuring device of claim 1, wherein the test support comprises a test support cylinder and three test support legs, the test support legs are hinged to the test support cylinder, the upper end and the lower end of the test support cylinder are open, a first notch and a second notch are formed in the upper end of the test support cylinder, a first pedal and a second pedal are arranged on the wall of the lower portion of the test cylinder, the shape of the first pedal is matched with that of the first notch, the shape of the second pedal is matched with that of the second notch, the first pedal is clamped on the first notch, and the second pedal is clamped on the second notch.
6. The constant head soil permeability coefficient measuring device of claim 1, wherein a water tank water outlet is arranged on a side wall of the water tank, the water tank water outlet is connected with a first rubber pipe, and a water outlet end of the first rubber pipe extends into the test cylinder.
7. the constant head soil permeability coefficient measuring device of claim 1, wherein a water tank water outlet is formed in a side wall of the water tank, the water tank water outlet is connected with a third rubber pipe, and a water outlet end of the third rubber pipe extends into the water containing device.
8. the constant head soil permeability coefficient measuring device of claim 2, characterized in that, the constant head soil permeability coefficient measuring device further comprises a tamping support, the tamping support comprises a bottom plate and two vertical rods, the two vertical rods are respectively and fixedly connected above the bottom plate, each vertical rod is provided with a horizontal pin hole, a support pin is inserted into the horizontal pin hole, the cross-shaped hole column is further provided with a horizontal hole, and the horizontal hole is in threaded fit with the support pin.
9. The constant head soil permeability coefficient measuring device of claim 2, wherein the second ring is connected with the screw rod base plate through three ring supports, one end of each ring support is connected to the screw rod base plate, and the other end of each ring support is connected with the second ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920247112.5U CN209802929U (en) | 2019-02-27 | 2019-02-27 | constant head soil permeability coefficient measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920247112.5U CN209802929U (en) | 2019-02-27 | 2019-02-27 | constant head soil permeability coefficient measuring device |
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| Publication Number | Publication Date |
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| CN209802929U true CN209802929U (en) | 2019-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920247112.5U Withdrawn - After Issue CN209802929U (en) | 2019-02-27 | 2019-02-27 | constant head soil permeability coefficient measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109752305A (en) * | 2019-02-27 | 2019-05-14 | 中国地质大学（武汉） | A kind of constant head soil permeability coefficient measurement device |
-
2019
- 2019-02-27 CN CN201920247112.5U patent/CN209802929U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109752305A (en) * | 2019-02-27 | 2019-05-14 | 中国地质大学（武汉） | A kind of constant head soil permeability coefficient measurement device |
| CN109752305B (en) * | 2019-02-27 | 2022-09-30 | 中国地质大学（武汉） | Constant head soil permeability coefficient measuring device |
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