CN209310955U - Soil pressure testing device - Google Patents
Soil pressure testing device Download PDFInfo
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- CN209310955U CN209310955U CN201920287908.3U CN201920287908U CN209310955U CN 209310955 U CN209310955 U CN 209310955U CN 201920287908 U CN201920287908 U CN 201920287908U CN 209310955 U CN209310955 U CN 209310955U
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- slide plate
- test
- soil pressure
- cover board
- lag frame
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- 238000012360 testing method Methods 0.000 title claims abstract description 95
- 239000002689 soil Substances 0.000 title claims abstract description 84
- 238000005192 partition Methods 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 230000000875 corresponding effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- -1 polytetrafluoroethylene ethylene Polymers 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model provides a kind of soil pressure testing device, including test board, U-lag frame, V-arrangement folder and straight tube, test board include slide plate and cover board, and cover board includes two pieces of splitted cover boards that slide plate is clipped in the middle, and the groove for cover board insertion is offered in U-lag frame；The bottom end of V-arrangement folder and the top of each U-lag frame are bolted respectively, the top of V-arrangement folder and straight tube welding, partition is fixed in V-arrangement folder, position on partition corresponding to each U-lag frame is respectively fixed with inductance coil, it is placed with tension spring respectively in each inductance coil, the bottom end of each tension spring passes through wirerope respectively and connects with corresponding slide plate, and the top of each tension spring is connected separately with the rope stretched out from straight tube top, and each inductance coil passes through conducting wire respectively and connect with secohmmeter.The utility model can be inserted directly into soil body deep from soil body surface, without pre-buried, cannot be only used for test and banket interior soil pressure, the soil pressure being more suitable in test undisturbed soil.
Description
Technical field
The utility model belongs to earth pressure test technical field, more specifically, is related to a kind of soil pressure testing device.
Background technique
In slope retaining, landslide control, the design of foundation pit supporting and retaining system, it is crucial that rationally determining the soil at different depth
The size of pressure, although classical soil mechanics theory provides the formula for calculating soil pressure according to geo-mechanics parameters, due to power
The applicability of theory and unevenness, the randomness of geo-mechanics parameters, calculated soil pressure often with actually have it is certain
It enters and leaves, considers further that the triviality that geo-mechanics parameters itself are tested, geotechnical engineers are more likely to survey using testing ground
Try out the numerical value of soil pressure.
Currently, on-the-spot test soil pressure is mainly using the method for embedded soil pressure cell, the soil pressure cell applied at present is electricity
Strain-type soil pressure cell and steel chord type soil pressure cell are hindered, soil pressure cell test soil pressure needs pre-plugged, is unable to test out original
Soil pressure in shape soil is mainly used for testing interior soil pressure of banketing.The thickness and test area of soil pressure cell are positively correlated, test surfaces
Product is bigger, and the thickness of box is bigger, if the Miniature Resistance-Strain-Transforming Pressure Cell of diameter 13mm is with a thickness of 8mm, the steel chord type pressure of diameter 88mm
Power box is with a thickness of 23mm.Since soil pressure cell is uncoordinated with soil deformation, the thickness of box is bigger, and test result error is bigger, simultaneously
Due to the unevenness of soil pressure size, test area is smaller, and test result is more unreliable (to get over the directive significance of engineering design
Difference), say there is significant limitation using traditional soil pressure cell test soil pressure from this respect.
Utility model content
In view of the above problems, the purpose of the utility model is to provide a kind of soil pressure testing devices, to solve existing soil
Pressure cell is not suitable for the problem of soil pressure in measurement undisturbed soil.
Soil pressure testing device provided by the utility model, comprising: at least three pieces of test boards, identical with test board quantity
U-lag frame, V-arrangement folder and straight tube；Wherein, every piece of test board respectively includes slide plate and cover board, the facade size phase between each slide plate
Different Deng, thickness, each cover board respectively includes two pieces of splitted cover boards, and each slide plate is clipped in respectively between corresponding two pieces of splitted cover boards；Each U-shaped
Facade between slot frame is equal sized, thickness is different, opens up respectively in each U-lag frame fluted, the groove depth of each groove is identical,
Groove width is different, and two pieces of splitted cover boards are inserted in corresponding groove；The bottom end of V-arrangement folder and the top of each U-lag frame pass through spiral shell respectively
It tethers and connects, the top of V-arrangement folder and straight tube welding are fixed with partition in V-arrangement folder, the position of each U-lag frame corresponded on partition
It sets and is respectively fixed with inductance coil, be placed with tension spring respectively in each inductance coil, the bottom end of each tension spring leads to respectively
It crosses wirerope to connect with corresponding slide plate, the top of each tension spring is connected separately with the rope stretched out from straight tube top, each electricity
Sense coil, which is connected separately with from straight tube top, stretches out the conducting wire connecting with secohmmeter.
Furthermore it is preferred that structure be fixed in the groove of each U-lag frame prevent cover board upward sliding anti-slide mass.
Additionally, it is preferred that structure be to be coated with polytetrafluoroethyl-ne respectively in the outer surface of each slide plate and the inner surface of each cover board
Ene coatings.
Compared with prior art, soil pressure testing device provided by the utility model can obtain following technical effect:
1, this soil pressure testing device can be inserted directly into soil body deep from soil body surface, without pre-buried, cannot be only used for
Interior soil pressure of banketing is tested, the soil pressure being more suitable in test undisturbed soil；
2, this soil pressure testing device guarantees the sufficiently large of earth pressure test area again on the basis of guaranteeing sufficiently thin；
3, during this soil pressure testing device is inserted into the soil body, there is certain squeezing action sheet practical new undisturbed soil
The soil pressure force value that type can be measured according to the test board of different-thickness derives the corresponding soil pressure force value of zero thickness test board.
Detailed description of the invention
By reference to the following description in conjunction with the accompanying drawings and the contents of the claims, and with to the utility model more
Comprehensive understanding, other purposes and result of the utility model will be more clearly understood and understood.In the accompanying drawings:
Fig. 1 is the structure chart according to the soil pressure testing device of the utility model embodiment；
Fig. 2 is the sectional view that Fig. 1 is longitudinally splitted from middle；
Fig. 3 is the sectional view that Fig. 1 is longitudinally splitted from two sides；
Fig. 4 is the sectional view that Fig. 1 is laterally splitted from lower end；
Fig. 5 is the fitting data figure according to the test board frictional force of the utility model embodiment.
Appended drawing reference therein includes: the first slide plate 1-1, the second slide plate 1-2, third slide plate 1-3, the first cover board 2-1,
Two cover board 2-2, third cover board 2-3, the first U-lag frame 3-1, the second U-lag frame 3-2, third U-lag frame 3-3, V-arrangement press from both sides 4, spiral shell
Bolt 5, straight tube 6, partition 7, inductance coil 8, tension spring 9, wirerope 10, rope 11, conducting wire 12, anti-slide mass 13.
Identical label indicates similar or corresponding feature or function in all the appended drawings.
Specific embodiment
Specific embodiment of the utility model is described in detail below with reference to attached drawing.
As Fig. 1-Fig. 4 jointly shown in, soil pressure testing device provided by the embodiment of the utility model, comprising: at least three pieces
Test board, U-lag frame identical with test board quantity, V-arrangement folder 4 and straight tube 6, every piece of test board respectively include slide plate and cover board,
Three pieces of test boards are shown in Fig. 1, are illustrated by taking three pieces of test boards as an example below, and three pieces of test boards are respectively the first test
Plate, the second test board and third test board, the first test board include the first slide plate 1-1 and the first cover board 2-1, the second test board packet
The second slide plate 1-2 and the second cover board 2-2 are included, third test board includes third slide plate 1-3 and third cover board 2-3, the first slide plate 1-
1, the thickness of the second slide plate 1-2 and third slide plate 1-3 is different, respectively 1mm, 3mm and 2mm, but the first slide plate 1-1, the second cunning
The facade of plate 1-2 and third slide plate 1-3 are equal sized, and the first cover board 2-1, the second cover board 2-2 and third cover board 2-3 are respectively included
Two pieces of splitted cover boards, and the sum of thickness of two pieces of splitted cover boards is 1mm, that is, the first cover board 2-1, the second cover board 2-2 and third cover board 2-
3 thickness is 1mm, and the length of the first cover board 2-1, the second cover board 2-2 and third cover board 2-3 are that 76mm, width are
50mm, the first slide plate 1-1 are clipped between two pieces of splitted cover boards of the first cover board 2-1, and the second slide plate 1-2 is clipped in the second cover board 2-2's
Between two pieces of splitted cover boards, third slide plate 1-3 is clipped between two pieces of splitted cover boards of third cover board 2-3, and cover sheet thickness and slide plate is thick
Degree the sum of be known as test plate thickness, then first test plate thickness, second test plate thickness, third test plate thickness be respectively 3mm,
5mm, 4mm, and the test area of test board be cover board and the soil body contact area, due to the first cover board 2-1, the second cover board 2-2,
The facade size of third cover board 2-3 is equal, and therefore, the equal test area of three pieces of test boards is 0.0038m2。
The utility model can not only guarantee that soil pressure testing device was sufficiently thin, but also can guarantee that earth pressure test area is enough
Greatly.
The quantity of U-lag frame is three, respectively the first U-lag frame 3-1, the second U-lag frame 3-2, third U-lag frame 3-
3, the first U-lag frame 3-1, the second U-lag frame 3-2, the facade of third U-lag frame 3-3 is equal sized, thickness is different, in the first U
Open up respectively fluted in shape slot frame 3-1, the second U-lag frame 3-2 and third U-lag frame 3-3, the groove depth of three grooves is identical,
Groove width is different, and the first cover board 2-1 is inserted in the groove of the first U-lag frame 3-1, and the second cover board 2-2 is inserted in the second U-lag frame
In the groove of 3-2, third cover board 2-3 is inserted in the groove of third U-lag frame 3-3.
It should be noted that test board needs to be inserted into the soil body, so U-lag frame is sharp bottom structure.
The top difference of the bottom end of V-arrangement folder 4 and the first U-lag frame 3-1, the second U-lag frame 3-2, third U-lag frame 3-3
It is connected by bolt 5, is fixed with partition 7 in V-arrangement folder 4, the first U-lag frame 3-1, the second U-lag frame are corresponded on partition 7
3-2, third U-lag frame 3-3 position be respectively fixed with inductance coil 8, be placed with pulling force bullet respectively in three inductance coils 8
Spring 9, the bottom end of three tension springs 9 pass through wirerope 10 and the first slide plate 1-1, the second slide plate 1-2, third slide plate 1-3 respectively
Connection, the top of three tension springs 9 are connected separately with rope 11, and three ropes 11 are stretched out from the top of straight tube 6 respectively, and three
Inductance coil 8 is connected separately with conducting wire 12, and the top that three conducting wires 12 distinguish straight tube 6 is stretched out to be connect with secohmmeter.
When pulling up rope 11, apply upward pulling force to tension spring 9, when pulling force is sufficiently large, tension spring 9
Slide plate upward sliding is pulled, at this point, secohmmeter can automatically record the least count of inductance, spring corresponding to the least count
Pulling force is frictional force suffered by slide plate.
In order to prevent cover board upward sliding, anti-slide mass 13 is fixed in the slot of U-lag frame.
In order to reduce the coefficient of friction between slide plate and cover board, thus power needed for reducing pulling slide plate, the two of slide plate
The inner surface of face and cover board is coated with polytetrafluoroethylene ethylene layer.
The structure of soil pressure testing device provided by the embodiment of the utility model is described in detail in above content, the soil pressure
Test device actually refers to the intensity of test soil pressure, but building work for testing the intracorporal soil pressure of soil, test soil pressure
Journey academia is referred to as soil pressure.
The process of earth pressure test is carried out using soil pressure testing device are as follows:
Tension spring: being placed in inductance coil by step S1 in advance, and inductance coil is connect by conducting wire with secohmmeter,
To calibrate inductance corresponding under different spring tensions.
During follow-up test, the inductance for reading secohmmeter can be obtained the current pulling force of tension spring, the pulling force
The frictional force being subject to for test board.
Step S2: at the predetermined depth of soil pressure testing device indentation inside soil body, secohmmeter is passed through into conducting wire and three
A inductance coil connection, pulls the rope of the first slide plate, the second slide plate and third slide plate top upwards in turn, passes through secohmmeter point
The first slide plate, the second slide plate and third slide plate are not recorded when pulled, the least count of inductance in secohmmeter.
When the first slide plate automatically records by secohmmeter the least count of inductance, the frictional force that the first slide plate is subject to is obtained
F (1) similarly obtains the frictional force F (2) of the second slide plate and frictional force F (3) that third slide plate is subject to.
Step S3: it is obtained under rectangular coordinate system using linear equation in two unknowns fitting according to frictional force F (1), F (2), F (3)
Fit equation derives the frictional force that test board of the thickness close to zero is subject to according to fit equation.
Since soil pressure testing device is during being inserted into the soil body, there is certain squeezing action to undisturbed soil, it is only thick
It spends close to the soil pressure that zero test board is measured and just represents true soil pressure force value, therefore, the utility model is sliding by first
The frictional force that plate, the second slide plate and third slide plate are subject to derives frictional force suffered by test board of the thickness close to zero, then
By frictional force calculation formula, soil pressure suffered by test board of the thickness close to zero is calculated, which represents soil
It is not affected by the soil pressure force value of extruding in vivo.
As shown in figure 5, testing plate thickness with a thickness of 3mm, the second test board to the first test board with a thickness of 5mm, third
The fit equation that suffered frictional force F (1), F (2), F (3) are fitted when for 4mm are as follows: y=-0.5x2+21.5x+
110；Wherein, x indicates that test plate thickness, y indicate the frictional force that test board is subject to.As x=0mm, y=F (0)=110N.
Step S4: the frictional force F (0) of the test board by the thickness derived close to zero is divided by the test demarcated in advance
The friction coefficient μ of plate calculates the soil pressure P that the test board two sides is subject to, soil pressure P divided by 2 obtain the test board single side by
The soil pressure P` arrived.
The step is using frictional force calculation formula, formula are as follows: F (0)=μ × P；Wherein, μ is between slide plate and cover board
Coefficient of friction, F (0) is the frictional force that is subject to of slide plate, and P is the soil pressure that cover board two sides is subject to, the then soil that cover board single side is subject to
Pressure P`=P/2.
Such as: F (0)=110N, friction coefficient μ=0.1, the test area of test board are 0.0038m2, then P=110/
0.1=1100N, P`=1100/2=550N act on the soil pressure intensity p=550/ of test board single side according to pressure formula
0.0038=144736Pa=144.736kPa.
Step S5: after the earth pressure test for completing the depth, being lifted up about 90mm for soil pressure testing device, due to
The top soil body is pressed from both sides by V-arrangement and is sufficiently squeezed, and the soil pressure acted on the cover board is released completely, and slide plate is fallen on just under the effect of gravity
Beginning position.
Step S6: the present apparatus is continued to be pressed into soil body deeper inside, carries out the earth pressure test of the depth again.
More than, only specific embodiment of the present utility model, but protection scope of the utility model is not limited thereto,
Anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in variation or replace
It changes, should be covered within the scope of the utility model.Therefore, the protection scope of the utility model should be with claim
Subject to protection scope.
Claims (3)
1. a kind of soil pressure testing device characterized by comprising at least three pieces of test boards, identical as the test board quantity
U-lag frame, V-arrangement folder and straight tube；Wherein,
Every piece of test board respectively includes slide plate and cover board, and the facade between each slide plate is equal sized, thickness is different, each cover board difference
Including two pieces of splitted cover boards, each slide plate is clipped in respectively between corresponding two pieces of splitted cover boards；
Facade between each U-lag frame is equal sized, thickness is different, opened up respectively in each U-lag frame it is fluted, each groove
Groove depth is identical, groove width is different, and two pieces of splitted cover boards are inserted in corresponding groove；
The bottom end of V-arrangement folder and the top of each U-lag frame are bolted respectively, the top of the V-arrangement folder and it is described directly
Pipe welding is fixed with partition in V-arrangement folder, and the position on the partition corresponding to each U-lag frame is respectively fixed with electricity
Feel coil, be placed with tension spring respectively in each inductance coil, the bottom end of each tension spring pass through respectively wirerope with it is corresponding
Slide plate connection, the top of each tension spring is connected separately with the rope stretched out from the straight tube top, each inductance coil difference
It is connected with from the straight tube top and stretches out the conducting wire connecting with secohmmeter.
2. soil pressure testing device as described in claim 1, which is characterized in that be fixed with resistance in the groove of each U-lag frame
The only anti-slide mass of cover board upward sliding.
3. soil pressure testing device as described in claim 1, which is characterized in that in the outer surface of each slide plate and each cover board
Surface is coated with polytetrafluorethylecoatings coatings respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920287908.3U CN209310955U (en) | 2019-03-07 | 2019-03-07 | Soil pressure testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920287908.3U CN209310955U (en) | 2019-03-07 | 2019-03-07 | Soil pressure testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209310955U true CN209310955U (en) | 2019-08-27 |
Family
ID=67682062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920287908.3U Expired - Fee Related CN209310955U (en) | 2019-03-07 | 2019-03-07 | Soil pressure testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209310955U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781310A (en) * | 2019-03-07 | 2019-05-21 | 重庆科技学院 | Soil pressure testing device and test method |
-
2019
- 2019-03-07 CN CN201920287908.3U patent/CN209310955U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781310A (en) * | 2019-03-07 | 2019-05-21 | 重庆科技学院 | Soil pressure testing device and test method |
| CN109781310B (en) * | 2019-03-07 | 2023-11-24 | 重庆科技学院 | Soil pressure testing device and testing method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190827 |
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| CF01 | Termination of patent right due to non-payment of annual fee |