CN205062789U - Portable T type sounding appearance - Google Patents

Portable T type sounding appearance Download PDF

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Publication number
CN205062789U
CN205062789U CN201520793465.7U CN201520793465U CN205062789U CN 205062789 U CN205062789 U CN 205062789U CN 201520793465 U CN201520793465 U CN 201520793465U CN 205062789 U CN205062789 U CN 205062789U
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China
Prior art keywords
probe
feeler lever
cone penetrometer
framework
utility
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CN201520793465.7U
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Inventor
贾宁
王洪播
李彦利
孟庆辉
刘颖
燕慧晓
阙金声
李振华
赵少阳
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North China Power Engineering Co Ltd of China Power Engineering Consulting Group
North China Power Engineering Beijing Co Ltd
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North China Power Engineering Co Ltd of China Power Engineering Consulting Group
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Abstract

The utility model relates to a portable T type sounding appearance, it includes probe, probe rod, the system of measurationing and frame, this probe rod one end and probe connection, its looks remote site and frame attach, should the system of measurationing include measure one's own ability ring, percentage table and additional dial plate, and be fixed in in this frame. The utility model discloses an equipment can be simplified through chooseing suitable probe and probe rod and compound mode for use greatly to the sounding appearance, reaches portable purpose and simultaneously, improves the measuring accuracy by a wide margin.

Description

Portable T-shaped cone penetrometer
Technical field
The utility model relates to a kind of portable T-shaped cone penetrometer.
Background technology
In the light-duty structure geotechnical investigations such as geotechnical engineering construction check of foundation subsoil or photovoltaic plant, when earth's surface is soft clay, jumbo is difficult to walking, needs a kind of light equipment to assess ultimate bearing capacity of foundation soil in time.The prerequisite of accurate evaluation ultimate bearing capacity of foundation soil is the undrained shear strength obtaining foundation soil body.The method of testing of this index mainly contains laboratory experiment method and the large class of in-situ test method two.Indoor test method adopts field sampling, and machining is carried out to soil sample in indoor, makes the sample of certain specification, then carries out unconfined compression strength test, direct shear test or triaxial test etc.Home position testing method, without the need to sampling, directly carries out at the scene.In current engineering, the home position testing method of extensive use has field vane shear test, cone penetration test and T-shaped cone penetration test etc.
In laboratory test process, sample stress condition is clear and definite, but sampling and the sample making course time long, result of the test can not be obtained in time.Field vane shear test is the direct method of testing of original position the most frequently used at present, but device systems is complicated, cannot portability, and only can obtain the value along degree of depth certain intervals discrete point.Cone penetration test conehead is less, for the soft clay that intensity is very low, measuring accuracy is poor, in order to eliminate the impact of foundation soil resistance suffered by feeler lever sidewall, this test method requires sensor to be arranged on probe position, therefore need the power line of sensor and data wire to draw ground by the feeler lever of hollow, thus feeler lever diameter is difficult to do very thin, is difficult to the static penetrometer making single-person portable.
But according to the cone penetrometer of T-shaped cone penetration test principle exploitation, pervasive device is comparatively large, is inconvenient to carry, is difficult to the demand meeting people.Thus, need badly at present a kind of portable T-shaped cone penetrometer is provided.
Utility model content
Solved technical problem of the present utility model is to provide a kind of portable T-shaped cone penetrometer, and this cone penetrometer by selecting suitable probe and feeler lever and combination, greatly simplified apparatus, can reach portable object simultaneously, significantly improving measuring accuracy.
For solving the problems of the technologies described above, the utility model provides a kind of portable T-shaped cone penetrometer, and it comprises probe, feeler lever, measurement system and framework, and this feeler lever one end is connected with probe, and its opposite end is connected with framework; This measurement system comprises ring of measuring one's own ability, dial gage and additional dial plate, and is fixed in this framework.
Portable T-shaped cone penetrometer of the present utility model is developed based on T-shaped cone penetration test principle, probe horizontal projected area is more than 10 times of static sounding probe, change for soft clay stratum is more responsive, and can obtain the continuous undrained shear strength value along the degree of depth, measuring accuracy improves greatly.Select the probe of suitable size and suitable feeler lever diameter, device for measuring force is installed on feeler lever top, the power that measurement system is measured is mainly probe resistance, within the scope of certain MTD, the impact of feeler lever side resistance can be ignored, thus simplified apparatus greatly, reach portable object.
Meanwhile, the feeler lever of the utility model equipment adopts high-strength steel to make, single-unit length optional 0.5m or 1m.In order to reduce foundation soil drag effects suffered by feeler lever, before meeting pressure bar stabilization requirement under topic, feeler lever diameter should be as far as possible little.Probe size deducts foundation soil resistance suffered by feeler lever determine according to the available load (can consider by the weight of a people) that presses down.In order to ignore feeler lever side friction, MTD, can not be too large by the Ratio control of feeler lever side friction with probe resistance.
In addition, the height and the width ratio of the cross section of this probe is less than or equal to 1.
Preferably, the cross section of this probe is circular.
Preferably, this probe cross section is oval.
The height and the width ratio of the utility model equipment choosing cross section is less than or equal to the probe of 1, is preferably circular or oval, effectively reduces in use procedure the impact of roughness for test result of popping one's head in thus.
Specifically, through actual test analysis, cylindrical probe (namely cross section is circular probe) can regard the special case of elliptical cylinder-shape probe (namely cross section is oval probe) as.When ellipse short shaft is less than 0.5 with the ratio of major axis, test result comparatively cylindrical probe improves more than 40%.In order to adapt to the soil body of varying strength, the probe of different size and specification can be manufactured, select in engineering practice.
As can be seen here, adopt cone penetrometer of the present utility model, especially when use has the probe of oval cross section, by the efficient cooperation of all parts, effectively can improve accuracy and the stability of test result.
In addition, the concrete connected mode of the utility model to probe and feeler lever provides two kinds specifically to improve, can according to different operating modes or actual demand unrestricted choice.
The first, feeler lever one end of cone penetrometer of the present utility model connects conical head, and this probe has the storage tank matched with this conical head, during use, this conical head embeds in this storage tank.
Adopting this kind of connected mode, only need to offer storage tank on probe, just can realize both connections without the need to setting up other devices or parts, simple, conveniently.In reality, the multi-link conical head in feeler lever tip, conical head cone angle 60 °, suits mutually with the storage tank at center probe position.When feeler lever is extracted, conical head and probe separation, to reduce uplift force.Probe is connected by being flexible coupling with feeler lever conical head, probe can be reclaimed upper pulling out in process.
As the improvement of the first connected mode, this storage tank is arranged at the length direction center of this probe.
Specifically, storage tank is arranged at center, probe length direction, makes probe two ends uniform force, to promote the steadiness of cone penetrometer of the present utility model further, makes it in use not easily deflection occur.
Another kind as the first connected mode improves, and arranges and receive dirty groove below this storage tank.
Arrange below storage tank in the utility model and receive dirty groove, when in the process of cone penetrometer press-in underground, this is received dirty groove and can hold the soil and impurity that enter in probe and feeler lever gap, and doublely can play the effect of protection probe.
The second, probe length direction of the present utility model arranges joint, and this joint sidewall has thread, and during use, this feeler lever and this joint are screwed together.
Adopt this kind of connected mode, namely feeler lever is by joint and the mode be spirally connected of popping one's head in, and compared to first kind of way, the second connects more firm, and probe can reuse.
Finally, the framework of portable T-shaped cone penetrometer of the present utility model is connected by bearing with between this feeler lever.
The utility model equipment middle frame can select angle steel or channel-section steel to make, and is connected between framework with feeler lever by bearing, to reduce frictional resistance, ensures the vertical transmission of pressure, can improve accuracy and the reliability of test result thus further.
Accompanying drawing explanation
Fig. 1 is the overall schematic of cone penetrometer in the utility model first embodiment.
Fig. 2 is the front view of popping one's head in the utility model first embodiment.
Fig. 3 is the lateral view of popping one's head in the utility model first embodiment.
Fig. 4 is the top view of popping one's head in the utility model first embodiment.
Fig. 5 is the combination schematic diagram of the utility model first embodiment middle frame and feeler lever.
Fig. 6 is the schematic diagram of feeler lever in the utility model first embodiment.
Fig. 7 is the combination schematic diagram of feeler lever and probe in the utility model second embodiment.
Fig. 8 is that resistance coefficient average compares change curve with axial length.
Detailed description of the invention
The utility model provides a kind of portable T-shaped cone penetrometer, and it comprises probe 1, feeler lever 2, measurement system 3 and framework 4, and this feeler lever 2 one end is connected with probe 1, and its opposite end is connected with framework 4; This measurement system 3 comprises ring 31 of measuring one's own ability, dial gage 32 and additional dial plate 33, and is fixed in this framework 4.
Specifically refer to Fig. 1, and can coordinate simultaneously consult Fig. 2 to Fig. 4.In a first embodiment, the cross section of probe 1 is oval, and through the test of reality, such design effectively can improve accuracy and the stability of test result.
In addition, refer to Fig. 6 and Fig. 7, feeler lever 2 one end connects conical head 5, and probe 1 has the storage tank 11 matched with this conical head 5, and this storage tank 11 is arranged at the length direction center of this probe 1, and below arranges and receives dirty groove 12.During use, conical head 5 embeds in this storage tank 11, then makes probe 1 realize being connected with feeler lever 2.
Probe 1 and feeler lever 2 adopt connected mode in the first embodiment, only need to offer storage tank 11 on probe 1, just can realize both connections without the need to setting up other devices or parts, simple, conveniently.In reality, the multi-link conical head 5 in feeler lever 2 tip, conical head 5 cone angle 60 °, suits mutually with the storage tank 11 in probe 1 centre.When feeler lever 2 is extracted, conical head 5 is separated with probe 1, to reduce uplift force.Probe 1 is connected by being flexible coupling with conical head 6, probe 1 can be reclaimed, avoid the waste of resource upper pulling out in process.
Refer to Fig. 5, be connected by bearing 6 between the present embodiment middle frame 4 with feeler lever 2.Framework 4 can select angle steel or channel-section steel to make, and is connected between framework 4 with feeler lever 2 by bearing 6, to reduce frictional resistance, ensures the vertical transmission of pressure, can improve accuracy and the reliability of test result thus further.
In the present embodiment, feeler lever 2 adopts high-strength steel to make, single-unit length optional 0.5m or 1m.In order to reduce foundation soil drag effects suffered by feeler lever 2, before meeting pressure bar stabilization requirement under topic, feeler lever diameter should be as far as possible little.Probe size deducts foundation soil resistance suffered by feeler lever 2 determine according to the available load (can consider by the weight of a people) that presses down.In order to ignore feeler lever side friction, MTD, can not be too large by the Ratio control of feeler lever side friction with probe resistance.Measurement system 3 is made up of ring 31 of measuring one's own ability, dial gage 32 and additional dial plate 33.The range of ring 31 of measuring one's own ability is determined according to the available load that presses down.Additional dial plate 33 can show and presses down load, ground undrained shear strength and ultimate bearing capacity of foundation soil.
Refer to Fig. 7 again, the concrete connected mode that the second embodiment and the difference of the first embodiment are embodied in probe 1 and feeler lever 2 is different, and miscellaneous part and connected mode are all identical, do not repeat them here, and is only described in detail both differences.
In second embodiment, 1 length direction of popping one's head in arranges joint 13, this joint 13 sidewall has thread, and during use, this feeler lever 2 is spirally connected with this joint 13 and is fixed together.
Below in conjunction with concrete data, the course of work of the utility model equipment and the beneficial effect of generation thereof are described in detail.
Probe level is placed in earth's surface, after feeler lever tip conical head and probe conical recess suit mutually, manually can applies feeler lever top load by handle, slowly and equably probe is flatly pressed into underground.Press down speeds control at about 1.2m/min.
The utility model cone penetrometer presses down in process, and record feeler lever 2 embedded depth and measure one's own ability ring 31, dial gage 32 reading, dial gage 32 reading is multiplied by ring 31 coefficient of measuring one's own ability, and must pop one's head in resistance P twith feeler lever resistance P rsum P.When feeler lever resistance can be ignored, P tapproximate P.When MTD is too large, feeler lever resistance P rwhen can not ignore, probe 1 first can be with only press down feeler lever 2 and carry out first time test, survey and read and record different depth resistance P r, after extracting, add that probe 1 carries out second time test, survey the resistance P reading different depth, the same degree of depth two tests the difference (P-P surveying result r) the suffered resistance P that pops one's head in can be thought t, then decipher is carried out to resistance namely obtain ultimate bearing capacity of foundation soil.
For cylindrical probe, according to document M.F.Randolph, G.T.HoulsbyThelimitingpressureonacircularpileloadedlater allyincohesivesoil [J] .G é otechnique, 1984, the theory recorded in 34 (4): 613 – 623., probe resistance P twith probe length L, diameter D, Soft Clay Foundation undrained shear strength S u, there is following relational expression:
P T S u D L = C - - - ( 1 )
In above formula, C is constant, corresponding to the completely smooth and completely coarse two kinds of situations of detecting head surface, is respectively 9.1 and 12.0.Desirable intermediate value 10.5 in practical application.
Soft clay undrained shear strength S can be obtained thus u:
S u = P T 10.5 D L - - - ( 2 )
For elliptical cylinder-shape probe, probe resistance P twith probe length L, axial length of popping one's head in (a and b), Soft Clay Foundation undrained shear strength S u, there is following relational expression:
2 P T 2 a 2 + b 2 S u L = N - - - ( 3 )
In above formula, N is resistance coefficient, with probe axial length ratio (b/a), detecting head surface roughness is relevant, can according to probe axial length ratio (b/a) in practical application, take the average under smooth and complete coarse operating mode entirely, calculate, obtain resistance coefficient average with axial length than change curve, as Fig. 8.
Soft clay undrained shear strength S can be obtained according to formula (3) u:
S u 2 P T 2 a 2 + b 2 N ‾ L - - - ( 4 )
Based on the soft clay undrained shear strength S that formula (3) or formula (4) are tried to achieve u, then try to achieve Soft Clay Foundation ultimate bearing capacity P according to formula (5) u:
P u=5.14S u(5)
For the probe of specific standard in reality, can by lower pressure resistance P, undrained shear strength S uwith ultimate bearing capacity of foundation soil P umark on additional dial plate, no longer need on-the-spot calculating, directly read.

Claims (10)

1. a portable T-shaped cone penetrometer, is characterized in that, comprise probe (1), feeler lever (2), measurement system (3) and framework (4), this feeler lever (2) one end is connected with probe (1), and its opposite end is connected with framework (4); This measurement system (3) comprises ring of measuring one's own ability (31), dial gage (32) and additional dial plate (33), and is fixed in this framework (4).
2. cone penetrometer as claimed in claim 1, it is characterized in that, the height and the width ratio of the cross section of this probe (1) is less than or equal to 1.
3. cone penetrometer as claimed in claim 2, is characterized in that, the cross section of this probe (1) is circular.
4. cone penetrometer as claimed in claim 2, is characterized in that, this probe (1) cross section is oval.
5. the cone penetrometer as described in claim 3 or 4, it is characterized in that, this feeler lever (2) one end connects conical head (5), and this probe (1) has the storage tank (11) matched with this conical head (5), during use, this conical head (5) embeds in this storage tank (11).
6. cone penetrometer as claimed in claim 5, it is characterized in that, this storage tank (11) is arranged at the length direction center of this probe (1).
7. cone penetrometer as claimed in claim 6, is characterized in that, this storage tank (11) below is arranged receives dirty groove (12).
8. the cone penetrometer as described in claim 3 or 4, is characterized in that, this probe (1) length direction is arranged joint (13), and this joint (13) sidewall has thread, and during use, this feeler lever (2) and this joint (13) are screwed together.
9. cone penetrometer as claimed in claim 5, is characterized in that, be connected between this framework (4) with this feeler lever (2) by bearing (6).
10. cone penetrometer as claimed in claim 8, is characterized in that, be connected between this framework (4) with this feeler lever (2) by bearing (6).
CN201520793465.7U 2015-10-14 2015-10-14 Portable T type sounding appearance Active CN205062789U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108318326A (en) * 2018-01-19 2018-07-24 浙江大学 A kind of miniature static sounding feeler lever
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
CN109667257A (en) * 2019-03-01 2019-04-23 四川电力设计咨询有限责任公司 A kind of portable power feeler inspection tester and test method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN108318326A (en) * 2018-01-19 2018-07-24 浙江大学 A kind of miniature static sounding feeler lever
CN109667257A (en) * 2019-03-01 2019-04-23 四川电力设计咨询有限责任公司 A kind of portable power feeler inspection tester and test method
CN109667257B (en) * 2019-03-01 2021-01-29 四川电力设计咨询有限责任公司 Portable dynamic sounding tester and testing method

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