CN102322052B - Self-balancing foundation load test device - Google Patents
Self-balancing foundation load test device Download PDFInfo
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- CN102322052B CN102322052B CN 201110208185 CN201110208185A CN102322052B CN 102322052 B CN102322052 B CN 102322052B CN 201110208185 CN201110208185 CN 201110208185 CN 201110208185 A CN201110208185 A CN 201110208185A CN 102322052 B CN102322052 B CN 102322052B
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a self-balancing foundation load test device, comprising a counter force system, an actuating system and a test system, wherein the counter force system comprises a counter force frame, a counter force anchor rod and a counter force anchor blade; the actuating system comprises a jack and a dowel bar; the test system comprises a stress meter, a dial indicator and a spiral test board; the upper end of the counter force anchor rod is blocked in the counter force frame, the exterior of the counter force anchor rod is provided with the counter force anchor blade, the dowel bar penetrates into the counter force anchor rod, wherein the two ends of the dowel bar extend out of the counter force anchor rod, the exterior of the lower end of the dowel bar is provided with the spiral test board, the upper end face of the dowel bar is connected with the jack, the upper part of the jack is provided with the stress meter, and the upper end of the stress meter is against onto a top plate inside the counter force frame; and the dial indicator is placed at the top of the dowel bar by virtue of a measuring support. By utilizing the self-balancing foundation load test device provided by the invention, multiple load tests in different depths can be carried out at the same plane position, the structure is simple, the operation is easy, and the working efficiency is high. In the invention, a self-balancing counter force system is adopted, and the expenditure cost is reduced or completely saved. The test device provided by the invention is light in weight and is convenient to carry.
Description
Technical field
The present invention relates to a kind of geotechnical engineering load test device, especially a kind of self-balancing type foundation load test device.
Background technology
Foundation loading test is test foundation strength and the most basic test of deformation parameter, also is one of the test that must adopt during for the appraisal of foundation that carries out important building.
" Code for investigation of geotechnical engineering " (GB50021-2001) related content of version the 10.2nd joint in 2009 is carried out in existing load test technical requirements.Load test mainly comprises shallow-layer load plate test, deep plate load testing and screw plate test, more than three kinds of tests be applicable to different foundation soils and groundwater condition, common characteristics must provide counter-force in the outside when being test, adopt earth anchor or top accumulation load method etc.This type of test is very loaded down with trivial details, and expense is high, long in time limit, and has a lot of uncertain potential safety hazards, and it is complicated to test employed device construction, complicated operation, and efficient is low, and experimental data is inaccurate, and expense is high, the shortcomings such as poor stability.
Summary of the invention
The objective of the invention is for overcoming above-mentioned the deficiencies in the prior art, a kind of simple structure, easy to operate, test efficiency is high, experimental data is accurate, expense is low, safe self-balancing type foundation load test device are provided.
For achieving the above object, the present invention adopts following technical proposals:
A kind of self-balancing type foundation load test device comprises counter force system, actuating system and test macro, and counter force system comprises reaction frame, counter-force anchor pole and counter-force anchor blade; Actuating system comprises jack, dowel bar; Test macro comprises stressometer, dial gage and spin test plate; Counter-force anchor pole upper end is stuck in the reaction frame, counter-force anchor pole outside is provided with counter-force anchor blade, be installed with the dowel bar that two ends length exceeds the counter-force anchor pole in the counter-force anchor pole, the outside, lower end of dowel bar is provided with the spin test plate, the dowel bar upper surface links to each other with jack, the top of jack is provided with stressometer, and the upper end of stressometer withstands on the reaction frame inner top; Dial gage is by measuring stentplacement at the dowel bar top.
Described reaction frame is square cage construction or triangle beveled structure.
Described reaction frame links to each other with counter-force anchor pole upper end by snap close.Among the present invention, push up on the reaction frame upper end of stressometer, and the lower end keeps flat the end face of jack.The major function of stressometer is measured exerting oneself of jack.
Reaction frame is delivered to the climbing power that jack produces on the counter-force anchor pole, and restriction jack, stressometer produce vertical displacement upwards.It is shaped as square cage construction or triangle beveled structure.The reaction frame lower end is connected with the counter-force anchor pole with snap close.
Jack pressurizes according to test requirements document.The upper end links to each other with stressometer, and the lower end keeps flat the dowel bar upper end.
Counter-force anchor blade screws in counter-force anchor pole and counter-force anchor blade in the soil layer by rig or manual type before the test, and counter-force anchor blade and the welding of counter-force anchor pole provide downward counter-force at the trial.
Dowel bar is delivered to the downforce that jack produces on the spin test plate.
The counter-force anchor pole is tubular structure, and dowel bar is from its middle passing through.The counter-force that counter-force anchor blade is produced is delivered on the reaction frame, and by reaction frame, stressometer, jack, dowel bar counter-force is delivered on the spin test plate, provides test required counter-force.
The spin test plate is welded on the dowel bar, and when dowel bar was subject to downward pressure, the spin test plate produced certain displacement, measured the engineering properties of soil layer according to pressure-displacement relation.
The displacement that the spin test plate produced when dial gage was measured the downforce that produces at jack.
Operating principle of the present invention is as follows:
At first utilize existing general drilling equipment, the mode of counter-force anchor pole, counter-force anchor blade and dowel bar, the utilization of spin test plate rotation is pierced the specific degree of depth in the soil layer simultaneously.The area of spin test plate is decided according to soil layer property.
Then assemble a whole set of testing equipment by test requirements document, exert pressure by jack, owing to be subject to the constraint of reaction frame, jack, stressometer etc. can not produce to top offset.The pressure that jack produces downwards is delivered on the spin test plate through dowel bar, and the spin test plate produces downward displacement gradually, and its displacement is measured by dial gage.Off-test when displacement reaches certain numerical value.Remove reaction frame this moment, connect the dowel bar of certain-length in the dowel bar upper end again, another test degree of depth that enters into soil layer with rig rotation dowel bar and spin test plate is downwards tested.Mode can be carried out the repeatedly load test of the different tests degree of depth in the same plane testing position according to this.
After the off-test, by rig counter-rotating each section dowel bar is proposed successively after, counter-force anchor pole, counter-force anchor blade and dowel bar, spin test plate are rotated from soil layer simultaneously propose simultaneously.
The self-balancing type foundation load test device characteristics
Utilize this device to carry out foundation loading test, can carry out in same plan-position the repeatedly load test of different depth, and simple in structure, convenient, high efficiency.Main feature is as follows:
1, simple in structure, easy to operate: this pilot system mainly comprises counter force system, pilot system, and the test apparatus device design is compact, easy to operate, and lightweight, easy carrying.
2, test efficiency is high: owing to adopt the self-balancing counter force system at the trial, do not need the outside that counter-force is provided or manually carry out preloading, greatly shortened the test duration.Utilize this pilot system can carry out continuously in same place the load test of different depth, greatly improved operating efficiency, shortened the duration.Adopt rig to rotate when being rotated down counter-force anchor and spin test plate, test speed is fast.
3, experimental data is accurate: because there is the vertical constraints effect of counter-force anchor pole in top, dowel bar has guaranteed test accuracy remaining vertical in the precession process downwards.Avoid because the displacement error of the inclination of dowel bar, crooked generation.When precession spin test plate, adopt rig at the uniform velocity, steadily creep into, reduced the disturbance to bottom test soil layer, improved the accuracy of test.
4, expense is low: the connection between the dowel bar adopts screw thread in conjunction with inserting lock device, can utilize inversion mode that the spin test plate is reclaimed after Total Test is finished, and can repeatedly utilize, and has saved cost of equipment.
The present invention is owing to adopt the self-balancing counter force system at the trial, do not need the outside that counter-force is provided or manually carries out preloading, reduces or saved main disbursement in original load test mode fully.
Because this experimental rig is lightweight, be convenient to carrying, can a saving equipment turnover expense and the removal charge of each testing site of intersite.
Description of drawings
Fig. 1 is the embodiment of the invention 1 structural representation;
Fig. 2 is the embodiment of the invention 2 structural representations;
Wherein 1. stressometers, 2. reaction frame, 3. jack, 4. counter-force anchor blade, 5. dowel bar, 6. counter-force anchor pole, 7. spin test plate, 8. dial gage, 9. ground.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
Embodiment 1:
As shown in Figure 1, a kind of self-balancing type foundation load test device comprises counter force system, actuating system and test macro, and counter force system comprises reaction frame 2, counter-force anchor pole 6 and the counter-force anchor blade 4 of square cage construction; Actuating system comprises jack 3, dowel bar 5; Test macro comprises stressometer 1, dial gage 8 and spin test plate 7; Counter-force anchor pole 6 upper ends are stuck in the reaction frame 2, counter-force anchor pole 6 outsides are provided with counter-force anchor blade 4, be installed with the dowel bar 5 that the length two ends exceed counter-force anchor pole 6 in the counter-force anchor pole 6, the outside, lower end of dowel bar 5 is provided with spin test plate 7, dowel bar 5 upper surfaces link to each other with jack 3, the top of jack 3 is provided with stressometer 1, and the upper end of stressometer 1 withstands on reaction frame 2 inner top; Dial gage 8 is by measuring stentplacement at dowel bar 5 tops.
Among the present invention, push up on the reaction frame 2 upper end of stressometer 1, and the lower end keeps flat the end face of jack 3.The major function of stressometer 1 is measured exerting oneself of jack 3, and counter-force is delivered on the jack 3 from reaction frame 2.
Jack 3 is exerted pressure according to test requirements document.The upper end links to each other with stressometer 1, and the lower end keeps flat dowel bar 5 upper ends.
Counter-force anchor blade 4 screws in counter-force anchor pole 4 and counter-force anchor blade 4 in the soil layer by rig before the test, and counter-force anchor blade 4 and 6 welding of counter-force anchor pole provide downward counter-force at the trial.
Dowel bar 5 is delivered to the downforce that jack 3 produces on the spin test plate 7.
Counter-force anchor pole 6 is tubular structure, and dowel bar 5 is from its middle passing through.The counter-force that counter-force anchor blade 4 is produced is delivered on the reaction frame 2, and by reaction frame 2, stressometer 1, jack 3, dowel bar 5 counter-force is delivered on the spin test plate 7, provides test required counter-force.
The displacement that spin test plate 7 produced when dial gage 8 was measured the downforce that produces at jack 3.
Operating principle of the present invention is as follows:
At first utilize existing general drilling equipment, utilize counter-force anchor blade 4, counter-force anchor pole 6 and dowel bar 5, spin test plate 7 mode of rotation to pierce simultaneously the specific degree of depth in the soil layer of ground below 9.The area of spin test plate 7 is decided according to soil layer property.
Then assemble a whole set of testing equipment by test requirements document, exert pressure by jack 3, owing to be subject to the constraint of reaction frame 2, jack 3, stressometer 1 etc. can not produce to top offset.The pressure that jack 3 produces downwards is delivered on the spin test plate 7 through dowel bar 5, and spin test plate 7 produces downward displacement gradually, and its displacement is measured by dial gage 8.Off-test when displacement reaches certain numerical value.Remove reaction frame 2 this moment, connects the dowel bar 5 of certain-length in dowel bar 5 upper ends again, and another test degree of depth that enters into soil layer with rig rotation dowel bar 5 and spin test plate 7 is downwards tested.Mode can be carried out the repeatedly load test of the different tests degree of depth in the same plane testing position according to this.
After the off-test, by rig counter-rotating each section dowel bar 5 is proposed successively after, counter-force anchor blade 4, counter-force anchor pole 6 and dowel bar 5, spin test plate 7 are rotated from soil layer simultaneously propose simultaneously.
Embodiment 2:
As shown in Figure 2, a kind of self-balancing type foundation load test device comprises counter force system, actuating system and test macro, and counter force system comprises reaction frame 2, counter-force anchor pole 6 and the counter-force anchor blade 4 of triangle beveled structure; Actuating system comprises jack 3, dowel bar 5; Test macro comprises stressometer 1, dial gage 8 and spin test plate 7; Counter-force anchor pole 6 upper ends are stuck in the reaction frame 2, counter-force anchor pole 6 outsides are provided with counter-force anchor blade 4, be installed with the dowel bar 5 that the length two ends exceed counter-force anchor pole 6 in the counter-force anchor pole 6, the outside, lower end of dowel bar 5 is provided with spin test plate 7, dowel bar 5 upper surfaces link to each other with jack 3, the top of jack 3 is provided with stressometer 1, and the upper end of stressometer 1 withstands on reaction frame 2 inner top; Dial gage 8 is by measuring stentplacement at dowel bar 5 tops.
Among the present invention, push up on the reaction frame 2 upper end of stressometer 1, and the lower end keeps flat the end face of jack 3.The major function of stressometer 1 is measured exerting oneself of jack 3, and counter-force is delivered on the jack 3 from reaction frame 2.
Jack 3 is exerted pressure according to test requirements document.The upper end links to each other with stressometer 1, and the lower end keeps flat dowel bar 5 upper ends.
The displacement that spin test plate 7 produced when dial gage 8 was measured the downforce that produces at jack 3.
Operating principle of the present invention is as follows:
At first utilize existing general drilling equipment, utilize counter-force anchor blade 4, counter-force anchor pole 6 and dowel bar 5, spin test plate 7 mode of rotation to pierce simultaneously the specific degree of depth in the soil layer of ground below 9.The area of spin test plate 7 is decided according to soil layer property.
Then assemble a whole set of testing equipment by test requirements document, exert pressure by jack 3, owing to be subject to the constraint of reaction frame 2, jack 3, stressometer 1 etc. can not produce to top offset.The pressure that jack 3 produces downwards is delivered on the spin test plate 7 through dowel bar 5, and spin test plate 7 produces downward displacement gradually, and its displacement is measured by dial gage 8.Off-test when displacement reaches certain numerical value.Remove reaction frame 2 this moment, connects the dowel bar 5 of certain-length in dowel bar 5 upper ends again, and another test degree of depth that enters into soil layer with rig rotation dowel bar 5 and spin test plate 7 is downwards tested.Mode can be carried out the repeatedly load test of the different tests degree of depth in the same plane testing position according to this.
After the off-test, by rig counter-rotating each section dowel bar 5 is proposed successively after, counter-force anchor blade 4, counter-force anchor pole 6 and dowel bar 5, spin test plate 7 are rotated from soil layer simultaneously propose simultaneously.
Claims (3)
1. a self-balancing type foundation load test device is characterized in that, comprises counter force system, actuating system and test macro, and counter force system comprises reaction frame, counter-force anchor pole and counter-force anchor blade; Actuating system comprises jack, dowel bar; Test macro comprises stressometer, dial gage and spin test plate; Counter-force anchor pole upper end is stuck in the reaction frame, counter-force anchor pole outside is provided with counter-force anchor blade, be installed with the dowel bar that two ends length exceeds the counter-force anchor pole in the counter-force anchor pole, the outside, lower end of dowel bar is provided with the spin test plate, the dowel bar upper surface links to each other with jack, the top of jack is provided with stressometer, and the upper end of stressometer withstands on the reaction frame inner top; Dial gage is by measuring stentplacement at the dowel bar top.
2. self-balancing type foundation load test device according to claim 1 is characterized in that, described reaction frame is square cage construction or triangle beveled structure.
3. self-balancing type foundation load test device according to claim 2 is characterized in that, described reaction frame links to each other with counter-force anchor pole upper end by snap close.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110208185 CN102322052B (en) | 2011-07-25 | 2011-07-25 | Self-balancing foundation load test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110208185 CN102322052B (en) | 2011-07-25 | 2011-07-25 | Self-balancing foundation load test device |
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| CN102322052A CN102322052A (en) | 2012-01-18 |
| CN102322052B true CN102322052B (en) | 2013-05-29 |
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| CN 201110208185 Active CN102322052B (en) | 2011-07-25 | 2011-07-25 | Self-balancing foundation load test device |
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| CN107121338A (en) * | 2017-06-21 | 2017-09-01 | 中冶沈勘工程技术有限公司 | A kind of variable cross-section CFG pile composite foundation static tests self-balancing combination unit and method |
| CN111501715B (en) * | 2020-04-17 | 2021-06-11 | 孙景辉 | Device for detecting bearing capacity of pile soil composite foundation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02232411A (en) * | 1989-03-07 | 1990-09-14 | Teruyuki Sato | Load test device |
| CN1896712A (en) * | 2006-06-14 | 2007-01-17 | 郭杨 | Planar loading testing method and tester for self-balanced deep foundation piles |
| CN201031400Y (en) * | 2007-05-18 | 2008-03-05 | 河北省建筑科学研究院 | Combined anchored internally supporting static loading tester |
| CN201695414U (en) * | 2010-02-01 | 2011-01-05 | 陈怀峰 | Spiral-plate loading test instrument |
| CN202175963U (en) * | 2011-07-25 | 2012-03-28 | 山东电力工程咨询院有限公司 | Self-balancing type foundation load test device |
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