CN206736981U - T-shaped feeler inspection diamond-shaped cross-section probe - Google Patents
T-shaped feeler inspection diamond-shaped cross-section probe Download PDFInfo
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- CN206736981U CN206736981U CN201720472824.8U CN201720472824U CN206736981U CN 206736981 U CN206736981 U CN 206736981U CN 201720472824 U CN201720472824 U CN 201720472824U CN 206736981 U CN206736981 U CN 206736981U
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Abstract
A kind of T-shaped feeler inspection diamond-shaped cross-section probe of the utility model, diamond-shaped cross-section probe is cross bar, and cross bar is connected with Double lumen intubation probe, and the side view of the cross bar is rhombus.Cross bar is with Double lumen intubation probe using cone slot type attachment structure or screw thread type attachment structure.In side view, rhombus long axis length is 2a, short axle 2b, 0<b/a<0.8.The probe of the T-shaped feeler inspection of tradition is changed to diamond-shaped cross-section by the utility model, detecting head surface roughness difference and the uncertain test error brought can significantly be reduced, Soft Clay Foundation undrained shear strength method is asked for original position the lifting of matter, greatly promotes application of this method in engineering practice.
Description
Technical field
It the utility model is related to T-shaped feeler inspection sonde configuration.
Background technology
T-shaped feeler inspection is also full stream feeler inspection, is a kind of method for the undrained shear strength for testing soft clay.Soft clay is not
Draining shearing strength is to determine the important indicator of foundation bearing capacity, bearing capacity of pile foundation and Critical Height of Embankment, is soft clay foundation
Parameter necessary to Foundation Pit Support Design.
The method of testing of the index mainly has laboratory experiment method and the class of in-situ test method two.During laboratory test sample by
Power condition is clear and definite, but in sampling and sample making course, sample is disturbed big, and result of the test dispersion is big, representative poor.In-situ test
In method, field vane shear test is method the most frequently used at present, but the drainage condition of the soil body can not control in test process, test effect
Rate is low, can only obtain the undrained shear strength along each discrete point of depth, and measuring point spacing is generally 1m.In home position testing method,
Cone penetration test rule of thumb relation, tries to achieve soft clay undrained shear strength indirectly.Upper earthing is included in this empirical relation
The contents such as pressure correction, the empirical coefficient related to soil nature and area.The value of these empirical coefficients will all influence test result
Accuracy.
The T-shaped feeler inspection probe of in-situ test tradition is cylinder, and test result interpretation has strict theoretical foundation, testing efficiency
Height, the continuous undrained shear strength value along depth can be obtained, but test result is had a great influence by detecting head surface roughness, it is right
Ying Yu is completely smooth and complete coarse two kinds of limiting conditions, and test result difference and average ratio are up to 26%.In Practical Project, added
Work and the influence of scene abrasion, it is difficult to control the roughness of probe, limit the application of the test method to a certain extent.Cause
A kind of Novel T-shaped feeler inspection probe for reducing probe roughness and influenceing is needed in this engineering practice.
The cone penetrometer popped one's head in using other shapes, it is always that engineering and academia make great efforts research to reduce systematic error
Direction.Probe is the core component of cone penetrometer, the corresponding different data interpretation mode of probe of different shapes, forms different touch
Visit instrument.The interpretation theoretical foundation of the T-shaped feeler inspection of cylinder proposes for the Randolph and Oxonian Houlsby of Cambridge University
Analytic expression [1].The analytic expression tries to achieve the theory analysis for being related to complexity.
[1]M.F.RANDOLPH,G.T.HOULSBY The limiting pressure on a circular pile
loaded laterally in cohesive soil[J].Géotechnique,1984,34(4):613–623.
Utility model content
The technical problem that the utility model solves is, the shortcomings that probe for the T-shaped feeler inspection of existing circular cross-section, proposes
A kind of new probe, so as to improve measuring accuracy and reliability.
To achieve the above object, the utility model adopts the following technical scheme that：A kind of T-shaped feeler inspection diamond-shaped cross-section probe, should
Diamond-shaped cross-section probe is cross bar, and cross bar is connected with Double lumen intubation probe, and the side view of the cross bar is rhombus.
Cross bar is provided with the circle that drift angle is 60 ° with Double lumen intubation probe using cone slot type attachment structure, cross bar middle part
Taper storage tank, Double lumen intubation probe is with montant and the top cap being connected with montant bottom, top cap and the storage tank phase
Suit.
Cross bar uses screw thread type attachment structure with Double lumen intubation probe, is provided with screw thread in the middle part of cross bar, screw thread passes through
Joint is connected with cross bar, and Double lumen intubation probe only has montant, montant bottom and screw thread bolt.
In side view, long axis length 2a, short axle 2b, 0<b/a<0.8.
The beneficial effects of the utility model are as follows.The utility model has tried to achieve the accurate solution of diamond-shaped cross-section probe resistance, point
Analysed systematic error with rhombus axial length than change, have found optimal axial length than section, obtained diamond-shaped cross-section probe work
Required calculating parameter.The probe of the T-shaped feeler inspection of tradition is changed to diamond-shaped cross-section by the utility model, and it is thick can significantly to reduce detecting head surface
Rugosity difference and the uncertain test error brought, asking for Soft Clay Foundation undrained shear strength method to original position has matter
Lifting, greatly promote application of this method in engineering practice.
Brief description of the drawings
Fig. 1 is utility model works structural representation.
Fig. 2 a are the utility model embodiment cross bar front view.
Fig. 2 b are Fig. 2 a side view.
Fig. 2 c are Fig. 2 a top view.
Fig. 3 a are another embodiment cross bar front view of the utility model.
Fig. 3 b are Fig. 3 a side view.
Fig. 3 c are Fig. 3 a top view.
Fig. 4 is the utility model embodiment cross bar and Double lumen intubation probe attachment structure schematic diagram.
Fig. 5 is another embodiment cross bar of the utility model and Double lumen intubation probe attachment structure schematic diagram.
Fig. 6 is drag-coefficient curve.
Fig. 7 is the ratio between resistance coefficient difference and average value curve.
Fig. 8 be resistance coefficient average value with axial length than change.
Embodiment
As shown in figure 1, a kind of T-shaped feeler inspection diamond-shaped cross-section probe of the utility model, diamond-shaped cross-section probe is cross bar 1, horizontal
Bar 1 is connected with Double lumen intubation probe 2, the hollow feeler lever 21 of top connection of Double lumen intubation probe 2, inside hollow feeler lever
Probe sensor transmission line 22 is provided with, is connected by probe sensor transmission line 22 with display device 23, display device 23
For showing reading of popping one's head in.It focuses on, and as shown in Fig. 2 a-c and Fig. 3 a-c, the side view of the cross bar 1 is rhombus.
In Fig. 2 a-c and Fig. 4, cross bar 1 is with Double lumen intubation probe 2 using cone slot type attachment structure, the middle part of cross bar 1
The conical storage tank 3 that drift angle A is 60 ° is provided with, Double lumen intubation probe 2 has montant 4 and is connected with the bottom of montant 4
Top cap 5, top cap cone angle and storage tank drift angle match, and 60 °, and top cap 5 just mutually suits closely with the storage tank 3.This
Behind kind structure diamond-shaped cross-section probe press-in underground, underground is left in, it is impossible to be brought up, be disposable.
In Fig. 3 a-c and Fig. 5, cross bar 1 uses screw thread type attachment structure, the middle part of cross bar 1 with Double lumen intubation probe 2
Screw thread 6 is provided with, screw thread 6 is connected by joint 7 with cross bar 1, the only montant 4 of Double lumen intubation probe 2, the bottom of montant 4
With the bolt of screw thread 6.Such a structure can be recycled.
The utility model has tried to achieve the accurate solution of diamond-shaped cross-section probe resistance by substantial amounts of research work, analyzes and is
Error of uniting with rhombus axial length than change, have found optimal axial length than section, obtained needed for diamond-shaped cross-section probe work
Calculating parameter.
The probe of the T-shaped feeler inspection of tradition is changed to diamond-shaped cross-section by the utility model, and it is poor can significantly to reduce detecting head surface roughness
The different and uncertain test error brought.Processing and fabricating of popping one's head in is convenient, can greatly promote this method in engineering practice
Using.
The utility model probe is the cross bar that section is rhombus.Cross bar can pass through two kinds with general static penetrometer main frame
Mode connects.
(1) slot type is bored.The conical storage tank that one drift angle is 60 ° is set in the middle part of diamond-shaped cross-section cross bar side.It is double during test
Vertically probe mutually suits bridge static contact-detection machine with this probe storage tank.
(2) screw thread type.The thread being connected with static contact-detection machine probe end is set in the middle part of diamond-shaped cross-section cross bar side.
Double lumen intubation probe top cap is taken, this thread is connected with static sounding probe end.
During test, this probe is flatly pressed into underground using static contact-detection machine.In process of press in, bored by static sounding
Sharp resistance, obtain pushing the power needed for diamond-shaped cross-section probe, be designated as the resistance P that pops one's head in.The general record per descending 10cm is once.
For soft clay, its undrained strength characteristic obeys Tresca yield conditions.Probe resistance P and soft clay not draining
Shearing strength Su), probe length L, probe the axial length of section rhombus half (a and b) and surface roughness α it is relevant.Moulded according to soil
Property mechanics slip line field theory, ask diamond-shaped cross-section to pop one's head in resistance P, there is a two methods, it is a kind of be should by construct that static(al) allows
The field of force, try to achieve resistance lower limit solution P-, a kind of is by constructing the motor-driven velocity of displacement field allowed, trying to achieve Upper Bound Solution P+.If the upper limit
Solve P+With lower limit solution P-Identical, then gained solution is accurate solution P.
According to this result of study, for complete coarse (α=1) and (α=0) two kinds of limiting conditions, resistance system are completely smooth
Number (Dimensionless) with diamond-shaped cross-section axial length be shown in Table 1 than ξ (ξ=b/a) relation.
The probe resistance coefficient of table 1 N
Will be completely coarse and be completely smooth under two kinds of working conditions, resistance coefficient (NCAnd NS) with axial length than change see figure
6.As can be seen from Figure 6, as reduction of the axial length than ξ, the difference of two kinds of operating mode resistance coefficients are gradually reduced.
It is completely smooth and complete coarse two kinds of operating mode resistance coefficient differences and resistance coefficient average value
The ratio between with axial length than change see Fig. 7.
As can be seen from Figure 7, diamond-shaped cross-section probe the ratio between resistance coefficient difference and average value, with axial length than increase, it is more next
It is bigger, systematic error increase.When axial length is less than 0.8 than b/a, diamond-shaped cross-section pops one's head in measuring accuracy better than the spy of typical round section
Head.Therefore, long axis length 2a, short axle 2b, 0<b/a<0.8.
When axial length is than ξ=0, i.e., when probe be a horizontal positioned no thickness piece, difference 0, test result is with popping one's head in
The roughness on surface is unrelated, and systematic error is minimum.But limited by the strength of materials, it is impossible to using the probe of ξ=0, but select
Select a suitable ξ value (0<ξ<0.8), probe is made to be tested.
Pop one's head in resistance P and probe length L, the axial length of diamond-shaped cross-section half (a and b), Soft Clay Foundation undrained shear strength Su,
There is relational expression (1) as follows：
The undrained shear strength of soft clay is directly tried to achieve using above formula.
Fig. 1 is probe operating diagram.Applied in work using static contact-detection machine and push load F, diamond-shaped cross-section is popped one's head in
Flatly it is pressed into underground.During pushing, by popping one's head in, pressure sensor surveys read tap cone resistance.The value is visited for diamond-shaped cross-section
Ground soil resistance suffered by head divided by the numerical value after static sounding probe top cap cross-sectional area, unit MPa.Therefore will pop one's head in reading
The cross-sectional area is multiplied by, produces diamond-shaped cross-section probe suffered resistance P during pushing.
During practical application, probe resistance P and probe length L, half axial length a and b of diamond-shaped cross-section probe, Soft Clay Foundation are not arranged
Water shearing strength Su, can be expressed by following relational expression (2).
In formula,It is more relevant than b/a, detecting head surface roughness with axial length for resistance coefficient, can be according to probe in practical application
Axial length takes the average value being completely smooth with complete coarse operating mode than b/a(Fig. 8 or table 2), is calculated.
The resistance coefficient average value of table 2
Soft clay undrained shear strength S can be obtained according to relational expression (2)uRelational expression (3)：
In test process, a reading is typically surveyed per 10cm along depth, test speed 1.2m/min, is calculated by relational expression (3)
Obtain undrained shear strength Su, draw along depth change curve.
Claims (4)
1. a kind of T-shaped feeler inspection diamond-shaped cross-section probe, diamond-shaped cross-section probe are cross bar, cross bar is connected with Double lumen intubation probe
Connect, it is characterised in that the side view of the cross bar is rhombus.
2. T-shaped feeler inspection diamond-shaped cross-section probe as claimed in claim 1, it is characterised in that cross bar is popped one's head in Double lumen intubation
Using cone slot type attachment structure, the conical storage tank that drift angle is 60 ° is provided with the middle part of cross bar, Double lumen intubation probe has
Montant and the top cap being connected with montant bottom, top cap mutually suit with the storage tank.
3. T-shaped feeler inspection diamond-shaped cross-section probe as claimed in claim 1, it is characterised in that cross bar is popped one's head in Double lumen intubation
Using screw thread type attachment structure, screw thread is provided with the middle part of cross bar, screw thread is connected by joint with cross bar, and Double lumen intubation is visited
Head only has montant, montant bottom and screw thread bolt.
4. T-shaped feeler inspection diamond-shaped cross-section probe as claimed in claim 1, it is characterised in that in side view, long axis length 2a,
Short axle is 2b, 0<b/a<0.8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108797654A (en) * | 2017-04-28 | 2018-11-13 | 中国电力工程顾问集团华北电力设计院有限公司 | T-type feeler inspection diamond-shaped cross-section is popped one's head in |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108797654A (en) * | 2017-04-28 | 2018-11-13 | 中国电力工程顾问集团华北电力设计院有限公司 | T-type feeler inspection diamond-shaped cross-section is popped one's head in |
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