CN101736728B - Elastic beam type side wall frictional resistance dynamometer - Google Patents
Elastic beam type side wall frictional resistance dynamometer Download PDFInfo
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- CN101736728B CN101736728B CN200910263089XA CN200910263089A CN101736728B CN 101736728 B CN101736728 B CN 101736728B CN 200910263089X A CN200910263089X A CN 200910263089XA CN 200910263089 A CN200910263089 A CN 200910263089A CN 101736728 B CN101736728 B CN 101736728B
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- frictional resistance
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Abstract
The invention relates to an elastic beam type side wall frictional resistance dynamometer belonging to the technical field of measuring equipment. The elastic beam type side wall frictional resistance dynamometer solves the problems that the frictional resistance test of the prior art has low precision and resolution, is influenced by the soil pressure and cannot fix the friction force direction and the like, and comprises an embedded plate, a panel, an elastic beam, a strain gauge and a protective box; the embedded plate and the panel are arranged in parallel; the embedded plate is fixedly connected to one end part of the protective box; the panel is connected to the other end part of the protective box; the panel can translate and dislocate relative to the embedded plate; the elastic beam and the strain gauge are arranged in the protective box; two ends of the elastic beam are respectively and fixedly connected with the panel and the embedded plate; and two ends of the strain gauge are respectively and fixedly connected with the embedded plate. The elastic beam type side wall frictional resistance dynamometer can be used for measuring the frictional resistance between side walls of objects of a rigid strucurue, such as sunk shafts, driven piles and the like, and surrounding soil bodies or can be used for indoor soil engineering tests and other special occasions.
Description
Technical field
The present invention relates to a kind of measureing equipment, relate in particular to a kind of elastic beam type side wall frictional resistance dynamometer, can be used for measuring the sidewall and the surrounding soil frictional resistance of rigid structures such as open caisson and driven pile, also can be used for simultaneously the friction testing between the soil body and structure side wall in the geotechnical model test.
Background technology
Often relate to rigid structures and soil body sidewall frictional resistance problem in the large-scale underground construction, as pile side friction, open caisson construction stage sidewall and soil body frictional resistance etc.Understanding the true distribution of frictional resistance studies (as the contact mechanics relation of pile foundation and pile peripheral earth) and instructs engineering construction significant for structure design, mechanical model.Yet, because the sidewall frictional resistance belongs to shear stress, directly monitoring is difficult, also lack effective monitoring instrument at present, therefore adopt the indirect monitoring means to obtain frictional resistance in the actual engineering usually, as use concrete strain meter or reinforcing bar meter to monitor the axle power or the caisson structure vertical stress of stake, indirect calculation side friction in view of the above.The shortcoming of this method is to obtain two average frictional resistances that calculate between the cross section, and can not obtain to need to investigate the sidewall frictional resistance of point; Simultaneously, because actual measurement strain or stress are very little, be in the same order of magnitude with observation error sometimes, so the precision of this method is very low.
For the frictional resistance in open caisson construction stage, also adopt the method for burying pressure cell in the side underground sometimes, by measuring normal stress and multiply by the friction factor frictional resistance that converted afterwards.But also there is obvious defects in this method: at first be that friction factor is difficult to accurate mensuration; Secondly, even if obtain friction factor accurately, if not at critical sliding friction state, frictional resistance also is not equal to normal stress and the product of friction factor; In addition, the direction of frictional force can't be determined in some cases, deflects after bearing the Hawser pulling force as the anchorage open caisson foundation, and this moment, the direction of frictional resistance might take a turn for the worse.These all are that the side is buried the insurmountable problem of pressure cell method underground.
In geotechnical model test, usually also need to simulate and measure the frictional force of the soil body and model structure sidewall, the object that is faced is to actual similar, but size is littler.That is to say that because model testing is generally scale model, suffered load and response thereof are all very little, therefore require measuring apparatus to have very high resolution ratio, this also is a present difficult point.
Summary of the invention
Elastic beam type side wall frictional resistance dynamometer provided by the invention, solved in the above-mentioned prior art frictional resistance measuring accuracy and resolution ratio low, disturbed by soil pressure and the frictional resistance direction such as can't determine at problem.
The present invention includes build-in plate, panel, spring beam, strain meter and protection box; Described build-in plate and the described panel layout that is parallel to each other, described build-in plate is fixedly connected on an end of described protection box; Described panel is connected the other end of described protection box, and described panel can be with respect to the described build-in plate translation changing of the relative positions; Described spring beam and described strain meter are arranged in the described protection box, fixedly connected with described build-in plate with described panel respectively in the two ends of described spring beam; Fixedly connected with described build-in plate with described panel respectively in the two ends of described strain meter.
Operating principle of the present invention is: the frictional force of soil body counter plate makes the translation changing of the relative positions under the elastic restraint of spring beam between panel and the build-in plate, and this changing of the relative positions causes the variation of strain meter length; By the strain value that strain meter measures, calculate the numerical value of this translation changing of the relative positions; Because this translation changing of the relative positions value also equals the deflection deformation amount of spring beam simultaneously,, can further obtain the suffered frictional resistance of panel therefore according to the relation between spring beam deflection deformation amount and the suffered load.
When the elastic beam type side wall frictional resistance dynamometer monitoring of structures thing that utilization the present invention proposes and the frictional resistance of the soil body, need its installation is embedded in works outer surface to be measured, measurement and computational process are as follows: 1) elastic beam type side wall frictional resistance dynamometer is installed in the hole of rigid structures sidewall reservation, make panels outside concordant with the rigid structures surface, and the direction of motion that guarantees works such as strain meter direction and open caisson is parallel, when works moves or movement tendency the time, the frictional force of soil body counter plate makes translation changing of the relative positions δ takes place between panel and the build-in plate, panel and build-in plate are fixedly connected on the two ends of spring beam respectively, be subjected to the elastic restraint effect of spring beam, the rigidity of δ and spring beam is inversely proportional to; 2) adopt strain meter to measure strain stress, try to achieve the relative slippage of panel and build-in plate thus, the amount of deflection of spring beam just, δ=ε l, wherein l is a strain meter length; 3) can draw suffered tangential force T=δ n (the 12EI)/h of panel according to the mechanics of materials
3, wherein h is the elasticity depth of beam, and EI is a rigidity of section, and n is the number of spring beam; If adopt non-uniform beam and consider the instrumentation error, during practical application, the suffered tangential force of panel can determine that wherein α is the calibration parameter according to T=α δ; 4) sidewall frictional resistance τ=T/A, wherein A is the panel effective area, i.e. the area that contacts with the soil body of panels outside face.
Spring beam described in the present invention is crucial sensing element, is core of the present invention.The deflection deformation that it is characterized in that utilizing the beam type member to very responsive perpendicular to the axial power of beam, design being parallel to insensitive these characteristics of the axial power of beam.In actual working state of the present invention, panel bears soil pressure and frictional resistance simultaneously, and soil pressure is greater than frictional resistance usually, and on the direction of the power of not associating, the frictional resistance direction is perpendicular to spring beam, and the soil pressure direction is parallel to spring beam.Therefore, although the suffered soil pressure of panel is greater than frictional resistance, the present invention has guaranteed that still our frictional resistance be concerned about of automatic screening measures, and ignores the influence of soil pressure, and the antijamming capability of instrument is strong; Secondly,, can capture small frictional resistance and change, so the resolution ratio of instrument is very high, can be used for geotechnical model test etc. resolution ratio is had the occasion of specific (special) requirements because the deflection deformation of spring beam is very responsive to frictional resistance; In addition, spring beam and panel, build-in slab integral are welded as an elastic deformable body, have linear relationship between the deflection deformation of spring beam and the frictional resistance, therefore can fully reflect special circumstances such as frictional resistance direction change, have good stable and precision.
As improvement of the present invention, on the medial surface of described protection box, draw-in groove is set, the side cooperation of described panel places described draw-in groove.
As improvement of the present invention, the link of described spring beam and described build-in plate prolongs laterally and forms an anchored end.
Above-mentioned anchored end can make whole instrument more reliable and more stable with being connected of surrounding concrete.
As improvement of the present invention, the two ends of described strain meter are mutually permanently connected by means of a rigid of transmission piece and described panel and described build-in plate respectively.
Above-mentioned rigid of transmission piece has made things convenient for being connected between strain meter and panel and the build-in plate.
Improve as of the present invention, described build-in plate, described panel, described protection box, described spring beam and described rigid of transmission piece are made by steel again.
As improvement of the present invention, on described spring beam, be provided with one and place the hole, described strain meter passes the described hole that places.
Be provided with on the spring beam and be convenient to the hole that places that strain meter places, can make the instrument internal structural configuration more reasonable thus.
As improvement of the present invention, on the lateral surface of described panel, arrange concrete.
Arrange concrete and member homotype to be measured on the panel, identical to guarantee the friction factor between instrument and the soil with actual conditions.
Improve as of the present invention again, offer several trough on the lateral surface of above-mentioned panel, described concrete filling is in each groove.
Figure of description
Fig. 1 is the structural representation of elastic beam type side wall frictional resistance dynamometer;
Fig. 2 is the sectional view along A-A line among Fig. 1.
The specific embodiment
As depicted in figs. 1 and 2, the elastic beam type side wall frictional resistance dynamometer in the present embodiment comprises build-in plate 1, panel 2 and protection box 3.Described build-in plate 1 and described panel 2 layout that is parallel to each other, build-in plate 1 are fixedly connected on an end of protection box 3; Panel 2 is connected the other end of protection box 3, and panel 2 can be with respect to the 1 translation changing of the relative positions of build-in plate.Preferably, draw-in groove 3-1 is set on the medial surface of above-mentioned protection box 3, the side cooperation of panel 2 places draw-in groove 3-1.
In described protection box 3, arrange first spring beam 4 and second spring beam 5, above-mentioned two spring beams 4 and 5 layout that is parallel to each other, fixedly connected with described build-in plate 1 with described panel 2 respectively in the two ends of every spring beam.Above-mentioned first spring beam 4 prolongs the formation first anchored end 4-1 laterally with the link of build-in plate 1; In the same manner, above-mentioned second spring beam 5 prolongs the formation second anchored end 5-1 laterally with the link of build-in plate 1.The above-mentioned first anchored end 4-1 and the second anchored end 5-1 are in outside the protection box 3.
Also arrange a strain meter 6 in described protection box 3, described strain meter 6 is parallel to each other with described panel 2 and described build-in plate 1, fixedlys connected with described build-in plate 1 with described panel 2 respectively in the two ends of strain meter 6.Preferably, an end of described strain meter 6 is mutually permanently connected with described panel 2 by means of the first rigid of transmission piece 7, and the other end is mutually permanently connected with described build-in plate 1 by means of the second rigid of transmission piece 8.Preferably, be provided with one and place hole 9 on every spring beam, strain meter 6 passes and places hole 9.
In addition, on the lateral surface of described panel 2, arrange concrete 10.Preferably, offer several trough 1-1 on the lateral surface of above-mentioned panel 2, concrete 10 is filled among each groove 1-1.
Described build-in plate 1, described panel 2, described protection box 3, described first spring beam 4, described second spring beam 5, the described first rigid of transmission piece 7 and the described second rigid of transmission piece 8 are made by steel.
Claims (8)
1. elastic beam type side wall frictional resistance dynamometer is characterized in that: comprise build-in plate, panel, spring beam, strain meter and protection box; The layout that is parallel to each other between described build-in plate and the described panel, described build-in plate is fixedly connected on an end of described protection box; Described panel is connected the other end of described protection box, and described panel can be with respect to the described build-in plate translation changing of the relative positions; Described spring beam and described strain meter are arranged in the described protection box, fixedly connected with described build-in plate with described panel respectively in the two ends of described spring beam; Fixedly connected with described build-in plate with described panel respectively in the two ends of described strain meter.
2. elastic beam type side wall frictional resistance dynamometer according to claim 1 is characterized in that: on the medial surface of described protection box draw-in groove is set, the side cooperation of described panel places described draw-in groove.
3. elastic beam type side wall frictional resistance dynamometer according to claim 1 is characterized in that: the link of described spring beam and described build-in plate prolongs laterally and forms an anchored end.
4. elastic beam type side wall frictional resistance dynamometer according to claim 1 is characterized in that: the two ends of described strain meter are mutually permanently connected by means of a rigid of transmission piece and described panel and described build-in plate respectively.
5. elastic beam type side wall frictional resistance dynamometer according to claim 4 is characterized in that: described build-in plate, described panel, described spring beam, described protection box and described rigid of transmission piece are made by steel.
6. elastic beam type side wall frictional resistance dynamometer according to claim 1 is characterized in that: be provided with one and place the hole on described spring beam, described strain meter passes the described hole that places.
7. elastic beam type side wall frictional resistance dynamometer according to claim 1 is characterized in that: arrange concrete on the lateral surface of described panel.
8. elastic beam type side wall frictional resistance dynamometer according to claim 7 is characterized in that: offer several trough on the lateral surface of above-mentioned panel, described concrete filling is in each groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910263089XA CN101736728B (en) | 2009-12-16 | 2009-12-16 | Elastic beam type side wall frictional resistance dynamometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910263089XA CN101736728B (en) | 2009-12-16 | 2009-12-16 | Elastic beam type side wall frictional resistance dynamometer |
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| Publication Number | Publication Date |
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| CN101736728A CN101736728A (en) | 2010-06-16 |
| CN101736728B true CN101736728B (en) | 2011-07-20 |
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| CN200910263089XA Expired - Fee Related CN101736728B (en) | 2009-12-16 | 2009-12-16 | Elastic beam type side wall frictional resistance dynamometer |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797267B (en) * | 2012-05-04 | 2014-10-22 | 上海交通大学 | Sealed open caisson side wall friction resistance meter |
| CN102817344B (en) * | 2012-05-04 | 2014-10-22 | 上海交通大学 | Comprehensive frictional resistance meter |
| CN104074210B (en) * | 2014-07-15 | 2016-06-01 | 中铁第一勘察设计院集团有限公司 | Pile foundation side friction shop experiment device and test method thereof |
| CN104278665B (en) * | 2014-09-28 | 2016-01-06 | 河海大学 | Steel open caisson sidewall and sword pin earth pressure gauge embedded device and method for embedding thereof under water |
| CN105064416B (en) * | 2015-07-28 | 2017-06-16 | 中国电建集团西北勘测设计研究院有限公司 | A kind of open caisson friction resistance gauge and its construction method |
| CN107869154B (en) * | 2017-11-27 | 2019-12-06 | 云南省建筑科学研究院 | Pile side resistance testing device and installation and use method thereof |
| CN113550288B (en) * | 2021-06-17 | 2022-07-01 | 中交二航局第三工程有限公司 | Clay stratum side friction resistance measuring device and measuring method |
| CN113686778A (en) * | 2021-08-24 | 2021-11-23 | 浙江同禾传感技术有限公司 | Friction meter, friction monitoring system and monitoring method |
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Owner name: JIANGSU YANGTZE RIVER HIGHWAY + BRIDGE CONSTRUCTIO |
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Inventor after: Wang Jian Inventor after: Wang Jinguo Inventor after: Zhou Zhifang Inventor after: Chen Ce Inventor after: Ruan Jing Inventor after: Zhong Jianchi Inventor after: Ji Lin Inventor before: Wang Jian Inventor before: Wang Jinguo Inventor before: Zhou Zhifang Inventor before: Ruan Jing Inventor before: Chen Ce |
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Free format text: CORRECT: INVENTOR; FROM: WANG JIAN WANG JINGUO ZHOU ZHIFANG RUAN JING CHEN CE TO: WANG JIAN WANG JINGUO ZHOU ZHIFANG CHEN CE RUAN JING ZHONG JIANCHI JI LIN |
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Effective date of registration: 20110527 Address after: 211100 Nanjing City, Jiangning Province, West Road, Buddha District, No. 8 Applicant after: HOHAI University Co-applicant after: Jiangsu Changjiang Highway and Bridge Construction Headquarter Address before: 211100 Nanjing City, Jiangning Province, West Road, Buddha District, No. 8 Applicant before: HOHAI University |
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