CN201443081U - Instrument for detecting bearing capacity and fill compactness of foundation soil on site - Google Patents
Instrument for detecting bearing capacity and fill compactness of foundation soil on site Download PDFInfo
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- CN201443081U CN201443081U CN2009200134354U CN200920013435U CN201443081U CN 201443081 U CN201443081 U CN 201443081U CN 2009200134354 U CN2009200134354 U CN 2009200134354U CN 200920013435 U CN200920013435 U CN 200920013435U CN 201443081 U CN201443081 U CN 201443081U
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- contact probe
- bearing capacity
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- load sensor
- foundation soil
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Abstract
An instrument for detecting the bearing capacity and the fill compactness of foundation soil on site relates to geotechnical engineering mechanics and comprises a casing, a cross beam, a load sensor, a transmission shaft, a contact probe rod, a contact probe, a data acquisition processor, a control display panel, a communication interface and a power box. The instrument is characterized in that the bottom part of the load sensor in the inner chamber of the casing is connected with the transmission shaft, the contact probe rod and the contact probe; and when the contact probe is inserted into the soil body, the signals of the load sensor change, are sampled, amplified, calculated and displayed via the data acquisition processor, and are sent to an upper computer for intelligentized processing via the communication interface. The utility model is different from a penetrometer, the sand replacement method and a nuclear density gauge which are used in the prior projects and fills up the deficiencies in the prior art that the field disturbance and the water loss are caused by drilling to fetch soil; the nuclear gauge has radiation pollution; the sand replacement method wastes time and labor; a spring force-measuring element has big errors; and a dividing ruler has a visual reading error and can not keep data.
Description
Technical field:
A kind of on-site detecting instrument for foundation bearing capacity and filling compactness relates to fields such as the prospecting, design, construction of geotechnical engineering circle, is used for the on-the-spot soil mechanics indexs such as the load power of estimating natural ground, the compaction rate of judging the artificial foundation, water content of describing.
Background technology:
We often touch natural ground and artificial backfill ground in the geotechnical engineering practice, for what the evaluation of the granular size of this class soil body, Density Distribution arrangement, load power, water content, index to its critical condition and ultimate limit state is judged, directly influence and controlling the quality of construction work, be the project of vital and lasting importance of state fundamental construction, therefore bearing capacity of foundation soil being banketed, compactness is carried out the in situ quantitation detection, qualitative analysis is most important.
A is arranged in the existing related techniques: " the miniature penetrometer of electronics " consulted Chinese patent 88216821.1 Shenyang automation research institutes and produced, and its principle: mechanical spring is load-sensing unit, depth sounding degree 1cm.Its weak point is: precise decreasing, error increase behind the spring fatigue, only 1cm is long owing to popping one's head in addition, depth sounding is limited can not on-the-spot in-situ test, can only drill soil sample got and increase native disturbance and fluid loss characteristics B: " the soil penetration resistance instrument " that the U.S. produces consulted Unite States Standard D1558-99 (2004) U.S. ground experimental material association and formulated, its principle: frame for movement, spring is done load-sensing unit, and rule shows.Its weak point is: the collimation error of scale itself just surpass ± 5%, precise decreasing, error increase behind the spring fatigue, the rule back data of shrinking back have just disappeared and can not keep.C: " nucleon density instrument " is referring to＜earthwork test rule〉SL237-1999 the 4th joint, Nanjing Shui Keyuan: Sheng Shuxin, Tao Xiuzhen, Xu Baimeng work, its principle: the electronics of using gamma-rays and material atom periphery carries out elastic collision, produce Compton scattering, the density of the soil body is big more, the gamma-rays decay big principle that just heals.Penetrate the variable quantity of soil strength by gamma-rays, calculate the density of the soil body.Its weak point is: because gamma ray projector is by cobalt 60 (Co
60) and caesium 137 (Cs
137) form, well-known to the radiation of human body to the pollution of environment, therefore supervision facilities such as its anti-spoke, protection are required very harsh, expensive big.D: " sand replacement method " is referring to＜earthwork test rule〉fragrant, the works such as Tao Xiuzhen, Xu Baimeng of Sheng tree of SL237-1999 second joint-Nanjing Hydraulic Research Institute.Its principle: the sand replacement method of digging pit is the standard sand and the method that weighs of grinding compacted soil that adopts equating volume, volume, calculates the density of the earthwork with this.Its weak point: labour intensity is big, consuming time, expensive, effort.
Summary of the invention:
The objective of the invention is for provide a kind of volume little, be easy to carry, the device of field control construction quality in the open air: on-site detecting instrument for foundation bearing capacity and filling compactness, the objective of the invention is for solve problems of the prior art (1: radioactive ray nuclear pollution, 2: probing native disturbance, the dehydration 3 that chemical examination causes of fetching earth: behind the spring fatigue precise decreasing, error increase, 4, the collimation error of rule itself, 5 scales shrink back the back data disappear can not keep, 6 sand replacement methods of digging pit are consuming time greatly expensive)
The scheme that realizes this purpose is: crossbeam-load sensor-power transmission shaft-sounding rod-contact probe-data collection processor-control display floater-communication interface is combined the banket instrumentation of compactness scene detection of formations-tableland base bearing capacity.
Its technical characterictic:, make the contact probe of rigidity drive sounding rod vertically in the injection soil body at the top plus-pressure of the horizontal Beam of T font.Contact probe is subjected to active force when the soil body thrusts, and the soil body produces a reaction force to contact probe, gets rid of the peripheral friction factor of contact probe to soil, usually the point resistance that acts on contact probe is called the penetration resistance of soil.The soil body is hard more, water content is few more, and density is big more, and intensity is high more, and penetration resistance is also big more.Otherwise also in like manner.We use this principle to select for use enough rigidity to be fit to the contact probe of diameter, just can obtain the penetration resistance of different soil properties under the same degree of depth, thereby mechanical index such as the intensity of load of acquisition inside soil body, water content, Density Distribution situation, this testing result is input to data collection processor and carries out computing, amplification, demonstration, storage, printing formation engineering report, has realized intelligent modernized site operation quality managemant.
Characteristics benefit of the present invention: 1, replaced mechanical rule value of reading, avoided the collimation error, improved precision 2, owing to be equipped with the lengthening sounding rod, needn't drill and fetch earth, can reconnoitre in-situ test, no not dehydration of disturbance on the spot, the soil mechanics index 3 of soil body native state, seedless detection have been kept, do not have radioactive ray to pollute 4, replaced sand replacement method, save a large amount of manpower and materials reductions of erection time, do a foundation ditch with sand replacement method survey density in the past and want several hrs, need ten minutes at most and survey a point with the present invention, social benefit is considerable.5, use that the single-chip data acquisition processor real-time is dynamically followed the tracks of, peak value reservation, mean value computation, directly form engineering report, realized intelligent modernized site operation quality managemant.
Description of drawings
Fig. 1: the mechanical composition part of on-site detecting instrument for foundation bearing capacity and filling compactness
Among Fig. 1: 1 crossbeam, 2 casings, 3 power packs, 4 data collection processors, 5 load sensors, 6 communication interfaces, 7 power transmission shafts, 8 sounding rods, 9 contact probes, 10 control display floaters, 11 displacement fairleads.
The specific embodiment:
Fig. 1 is an embodiment of this programme: special casing 2 is with load sensor 5 and mechanical conductive system: (power transmission shaft 7, sounding rod 8, contact probe 9)-data collection processor 4, organically combine its feature: the bottom that the inner chamber central authorities that the top of casing is provided with crossbeam, the casing of T font are fixed with load sensor, casing is equipped with control display floater and communication interface is housed on the housing that is provided with data collection processor, power pack, casing in displacement fairlead, the casing.Load sensor links to each other with power transmission shaft, is connected with sounding rod, contact probe successively again.
Sounding rod among Fig. 1 is designed to single-unit and multi-segment structure according to detecting needs, connects with screw thread, keyway, drift bolt between each section, and the surface of each joint sounding rod is equipped with the depth of displacement graduated scale.
Contact probe among Fig. 1, its shape is designed to taper shape as requested, and pyramid, cylindrical, three kinds, diameter are Ф 4.52 Ф 6.4, Ф 9.07, Ф 16.5, and angle is 20 °, 30 °, 45 °, 60 °, 180 °
Power pack among Fig. 1 is equipped with power pack on the screen in casing, and is general for two kinds of batteries charging, that do not charge
Data collection processor among Fig. 1, adopt the singlechip controller-Gao integrated operational amplifier-LCD of low-voltage super low-power consumption, realize that the variable signal to load sensor carries out real-time sampling, comparison, calculating, tracking shows and input/output signal is delivered to communication interface.
The course of work of the present invention is: to the crossbeam at instrument top pressure in addition, load sensor produces stress deformation, by sounding rod with in the contact probe injection soil, survey the physico-mechanical properties of soil layer according to the size of the contact probe point resistance in the injection soil, set up penetration resistance Ps and bearing capacity fa and the compactness λ compression amount of touching E with this
sBetween dependency relation.Again that load sensor is measured related data delivers to data collection processor and samples-amplify-store-real time dynamic tracing-peak-peak reservation-mean value calculation-result shows, data are sent to the terminal called interface simultaneously, connect host computer and form engineering report, so far finished a whole set of modernized construction quality and detected and the office intelligent management.
Claims (6)
1. on-site detecting instrument for foundation bearing capacity and filling compactness comprises: formations such as casing, horizontal Beam, load sensor, displacement fairlead, power transmission shaft, sounding rod, contact probe, data collection processor, control display floater, communication interface, power pack, it is characterized in that: load sensor and data collection processor, display control panel, power transmission shaft, sounding rod, contact probe are combined.
2. the bearing capacity of foundation soil according to claim 1 compactness detector that bankets is characterized in that a T font handle crossbeam is arranged at the top of casing, and the bottom of casing is fixed with the displacement fairlead.
3. the bearing capacity of foundation soil according to claim 1 compactness detector that bankets is characterized in that: load sensor is equipped with at the inner chamber middle part of casing.Load sensor is connected with contact probe piecemeal with power transmission shaft, sounding rod again.
4. the bearing capacity of foundation soil according to claim 1 compactness detector that bankets is characterized in that: be provided with in the casing on the housing of data collection processor, power pack, casing display control panel and communication interface are housed.
5. the bearing capacity of foundation soil according to claim 1 compactness detector that bankets, it is characterized in that: sounding rod is divided into single-unit and multi-segment structure as required, connect with screw thread, keyway, drift bolt between each section, the surface of each joint sounding rod is equipped with the displacement graduated scale.
6. the bearing capacity of foundation soil according to claim 1 compactness detector that bankets is characterized in that: contact probe is provided with taper shape, pyramid and cylindrical three kinds as required.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200134354U CN201443081U (en) | 2009-05-05 | 2009-05-05 | Instrument for detecting bearing capacity and fill compactness of foundation soil on site |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200134354U CN201443081U (en) | 2009-05-05 | 2009-05-05 | Instrument for detecting bearing capacity and fill compactness of foundation soil on site |
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| CN201443081U true CN201443081U (en) | 2010-04-28 |
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| CN2009200134354U Expired - Fee Related CN201443081U (en) | 2009-05-05 | 2009-05-05 | Instrument for detecting bearing capacity and fill compactness of foundation soil on site |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102535425A (en) * | 2012-03-12 | 2012-07-04 | 中铁第五勘察设计院集团有限公司 | Detector for compaction quality of roadbed slope |
| CN102721629A (en) * | 2011-03-29 | 2012-10-10 | 厦门钨业股份有限公司 | A powder compact density uniformity characterization method |
| CN103439222A (en) * | 2013-08-09 | 2013-12-11 | 长安大学 | Cold supplement asphalt mixture low temperature working performance testing device and testing method |
| CN106370590A (en) * | 2016-12-07 | 2017-02-01 | 中铁上海设计院集团有限公司 | Testing device and testing method for determining compactness state of sandy or silty soil on site |
| CN106703087A (en) * | 2016-11-30 | 2017-05-24 | 上海岩土工程勘察设计研究院有限公司 | Cast-in-place pile end slurry supplying and grouting device and method |
-
2009
- 2009-05-05 CN CN2009200134354U patent/CN201443081U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721629A (en) * | 2011-03-29 | 2012-10-10 | 厦门钨业股份有限公司 | A powder compact density uniformity characterization method |
| CN102535425A (en) * | 2012-03-12 | 2012-07-04 | 中铁第五勘察设计院集团有限公司 | Detector for compaction quality of roadbed slope |
| CN102535425B (en) * | 2012-03-12 | 2014-08-06 | 中铁第五勘察设计院集团有限公司 | Detector for compaction quality of roadbed slope |
| CN103439222A (en) * | 2013-08-09 | 2013-12-11 | 长安大学 | Cold supplement asphalt mixture low temperature working performance testing device and testing method |
| CN103439222B (en) * | 2013-08-09 | 2016-03-02 | 长安大学 | A kind of cold repairing asphalt mixture low-temperature working performance testing device and method of testing |
| CN106703087A (en) * | 2016-11-30 | 2017-05-24 | 上海岩土工程勘察设计研究院有限公司 | Cast-in-place pile end slurry supplying and grouting device and method |
| CN106370590A (en) * | 2016-12-07 | 2017-02-01 | 中铁上海设计院集团有限公司 | Testing device and testing method for determining compactness state of sandy or silty soil on site |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100428 Termination date: 20110505 |