CN1385586A - Vacuum negative pressure static force pile testing method and device thereof - Google Patents
Vacuum negative pressure static force pile testing method and device thereof Download PDFInfo
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- CN1385586A CN1385586A CN 02112124 CN02112124A CN1385586A CN 1385586 A CN1385586 A CN 1385586A CN 02112124 CN02112124 CN 02112124 CN 02112124 A CN02112124 A CN 02112124A CN 1385586 A CN1385586 A CN 1385586A
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- rigid platfor
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- 238000012360 testing method Methods 0.000 title claims abstract description 53
- 230000003068 static effect Effects 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims description 14
- 238000012544 monitoring process Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 238000004062 sedimentation Methods 0.000 claims description 10
- 239000000725 suspension Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 239000002689 soil Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000005086 pumping Methods 0.000 abstract 1
- 238000004873 anchoring Methods 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000012812 general test Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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Abstract
The present invention discloses a vacuum negative pressure static pile-testing method and its equipment. The rigid platform is mounted on the impervious bariier of foundation around tested pile, the test pile end in the rigid platform is equipped with bearing plate and jack, a support seat is mounted on the end surface of the bearing plate, a settlement sensing instrument is mounted on the refernece beam, its measuring head is contacted with end face of the support seat, and said rigid platform is connected with external oil pump, settlement data collector, air pressure moniotirng apparatus and vacuum air pumping machine. When it is tested, air is pumped to attain a certain vacuum degree, the rigid platform can provide enough reaction force for pressurizing test pile.
Description
Technical field
The present invention relates to a kind of vacuum negative pressure static force pile testing method and device.
Background technology
Existing static force pile testing method mainly contains traditional accumulation load method and anchoring pile method, and the self-balancing approach (Octerberg method) that gets up of development in recent years.Traditional accumulation load method and anchoring pile law theory maturation can be simulated the practical working situation of stake, but effort, time-consuming, expensive.As adopt accumulation load method to need a large amount of loadings, as adopt packed sand hill manually to pile heavily, then consuming time more, under tight situation of duration, the time can't satisfy, and especially for the large-tonnage test pile, the preloading difficulty is also bigger, and is dangerous higher.Adopt the static load test of anchoring pile method, the construction of its anchoring pile and Master Cost are also very high.To the self-balancing approach static force pile testing, though it is simple to operate, save time, save money, but force-bearing situation is inconsistent when stressing conditions during test pile and stake real work, and the gained result reliability is relatively poor relatively, and is particularly bigger in the possibility that does not have test failure under the too many historical summary situation.To anchoring pile method and self-balancing approach load test, test pile just must determine that before piling can not accomplish to inspect by random samples at random, test result is representative poor, often can not reflect the quality of actual engineering piles in addition.
Summary of the invention
The objective of the invention is to design a kind of vacuum negative pressure static force pile testing method and device that adopts atmospheric pressure that the required counter-force of test pile is provided, its equipment is simple, and is easy to operate, can simulate the practical working situation of stake.
The technical solution used in the present invention is:
Vacuum negative pressure static force pile testing method adopts atmospheric pressure to provide test pile to load required counter-force, promptly for the previous period in test, around test pile, make one deck foundation anti-seepage layer, to prevent that underground water or air in soil body from entering the region of no pressure under the atmospheric pressure effect, in the test preparatory stage, install and connect compression system, the settlement measurement system, exhaust plant, gas pressure monitoring equipment, then rigid platfor is covered and seal with airtight material, when test is carried out, bleed with vacuum air pump, after reaching the certain vacuum degree, can provide enough counter-forces to take on the rigid platfor, can apply corresponding load and carry out the relevant work of reading of surveying by jack for the test pile pressurization, simultaneously as required, at any time bleed, to keep the vacuum necessary degree, follow-up step is with traditional static load test.
Device 1:
It comprises is equipped with manometric oil pump, the settling data Acquisition Instrument, and bearing, datum line beam, the settlement sensor instrument, jack, bearing plate, skin are covered with the rigid platfor of airtight material, Pressure monitoring instrument, vacuum air pump; Rigid platfor is installed on the tested test pile foundation anti-seepage layer on every side, test pile end face in the rigid platfor from down and on bearing plate and jack are housed successively, on the bearing plate end face bearing is housed, sedimentation sensing instrument is installed on the datum line beam, its gage outfit contacts with the bearing end face, and rigid platfor is circumscribed with oil pump, settling data Acquisition Instrument, Pressure monitoring instrument, vacuum air pump.
Rigid platfor be shaped as square terrace with edge or conical round platform.
Device 2:
It comprises is equipped with manometric oil pump, the settling data Acquisition Instrument, and bearing, datum line beam, sedimentation sensing instrument, jack, bearing plate, skin are covered with the rigid platfor of airtight material, Pressure monitoring instrument, vacuum air pump; Rigid platfor is installed on the tested test pile foundation anti-seepage layer on every side with the buttress support, test pile end face in the rigid platfor from down and on bearing plate, jack and backing plate are housed successively, on the bearing plate end face bearing is housed, sedimentation sensing instrument is installed on the datum line beam respectively, its gage outfit contacts with the bearing end face, and rigid platfor is circumscribed with oil pump, settling data Acquisition Instrument, Pressure monitoring instrument, vacuum air pump.
Can contact with backing plate below be equipped with at the rigid platfor center that skin is covered with airtight material and top and the bolted cylinder of suspension cable, the suspension cable other end is connected with bolt with the periphery of rigid platfor.
The useful effect that the present invention has is: utilize atmospheric pressure to provide test pile to load required counter-force.If adopt rigid platfor to be of a size of 12m * 12m (square) or diameter 14m (circle), vacuum is 85～90%, the counter-force (rigid platfor weight is as safety stock) of 12000KN～13000KN then can be provided, this is enough to general test pile, gets final product if need bigger load only to need suitably to increase the rigid platfor area.This method equipment is simple, easy to operate, laborsaving, save money, save time, and with traditional static load test the same can real simulated the practical working situation of stake, used principle and theoretical simple, ripe, test pile can be randomly drawed, so representative good, the reliability advantages of higher of result.This method has overcome the shortcoming of existing various static force pile testing methods to a great extent, draws its advantage simultaneously again.The present invention is with a wide range of applications.
Description of drawings
Fig. 1 is a kind of box structure principle schematic of the present invention;
Fig. 2 is an another kind of beveled structure principle schematic of the present invention;
Fig. 3 is the umbrella shape frame vertical view of Fig. 2.
The specific embodiment
As shown in Figure 1, it comprises the oil pump 2 that pressure meter 1 is housed, settling data Acquisition Instrument 3, and bearing 6, datum line beam 7, settlement sensor instrument 8, jack 9, bearing plate 10, skin are covered with the rigid platfor 11 of airtight material 12, Pressure monitoring instrument 13, vacuum air pump 14; Rigid platfor 11 is installed on the foundation anti-seepage layer 4 on ground 15 around the tested test pile 5, test pile 5 end faces in the rigid platfor 11 from down and on bearing plate 10 and jack 9 are housed successively, on bearing plate 10 end faces bearing 6 is housed, sedimentation sensing instrument 8 is installed on the datum line beam 7, its gage outfit contacts with bearing 6 end faces, and rigid platfor 11 is circumscribed with oil pump 2, settling data Acquisition Instrument 3, Pressure monitoring instrument 13, vacuum air pump 14.Rigid platfor 11 be shaped as square terrace with edge or conical round platform.
As Fig. 2, shown in Figure 3, it comprises the oil pump 2 that pressure meter 1 is housed, settling data Acquisition Instrument 3, bearing 6, datum line beam 7, settlement sensor instrument 8, jack 9, bearing plate 10, the rigid platfor 19 of outer airtight material 18, Pressure monitoring instrument 13, vacuum air pump 14; Rigid platfor 19 usefulness buttresses 16 are supported on the foundation anti-seepage layer 4 that is installed in ground 15 around the tested test pile 5, test pile 5 end faces in the rigid platfor 19 from down and on bearing plate 10, jack 9 and backing plate 22 are housed successively, on bearing plate 10 end faces bearing 6 is housed, sedimentation sensing instrument 8 is installed on the datum line beam 7, its gage outfit contacts with bearing 6 end faces, and rigid platfor 11 is circumscribed with oil pump 2, settling data Acquisition Instrument 3, Pressure monitoring instrument 13, vacuum air pump 14.Below being equipped with, rigid platfor 19 centers can contact with backing plate, and the top cylinder 21 that is connected with suspension cable 20 usefulness bolts 17, suspension cable 20 other ends are connected with bolt 17 with the periphery of rigid platfor 19.
Its testing equipment device of the present invention has two kinds, and respectively as depicted in figs. 1 and 2, both difference are the installation form difference of rigid platfor.Fig. 1 is the box-structure that rigid material is assembled into hollow round platform or terrace with edge; Fig. 2 is assembled into the umbellate form shelf structure to rigid material and cylinder with bolt and suspension cable, and the vertical view of this structure is seen Fig. 3.Between rigid platfor and foundation anti-seepage layer, to build a circle, thereby make both separate formed space as the region of no pressure with brick and cement.On rigid platfor, cover airtight material, make rigid platfor and foundation anti-seepage layer form a sealed space.In the time of need loading to test pile, only need the atmosphere in the seal cavity is extracted out, make interior volume form vacuum, rigid platfor begins to bear the atmospheric pressure of outside and it is passed to jack with as the loading counter-force simultaneously; Airtight material then is that maintenance is air tight by the space that rigid platfor and foundation anti-seepage layer constitute jointly, so that this space can keep higher vacuum after bleeding; Jack, datum line beam and sedimentation sensing instrument also are installed in this space.Jack is connected with pressure meter with the oil pump of outside by high-pressure oil pipe, so that pressurization and read pressure reading; Sedimentation sensing instrument is fixed on the datum line beam and by lead and links to each other with the settling data Acquisition Instrument of outside, thereby measures sedimentation and gather by the settling data Acquisition Instrument of outside.Also be provided with the gas pressure monitoring device in addition to observe the vacuum in the seal cavity at any time.
When using this device, must guarantee that tightness and barrier properties are good, so that inside can keep higher vacuum and impermeability; Must after providing enough counter-force to jack, rigid platfor can apply corresponding load; Have only all to unsnatch and to exit after the load, the cancellation vacuum.
Claims (5)
1. vacuum negative pressure static force pile testing method, it is characterized in that: it adopts atmospheric pressure to provide test pile to load required counter-force, promptly for the previous period, around test pile, make one deck foundation anti-seepage layer, under the atmospheric pressure effect, enter the region of no pressure to prevent underground water or air in soil body in test; In the test preparatory stage, install and connect compression system, settlement measurement system, exhaust plant, gas pressure monitoring equipment, then rigid platfor is covered and seal with airtight material; When test is carried out, bleed with vacuum air pump, after reaching the certain vacuum degree, on rigid platfor, can provide enough counter-forces to take for the test pile pressurization, can apply corresponding load and carry out the relevant work of reading of surveying by jack, simultaneously as required, bleed at any time, to keep the vacuum necessary degree, follow-up step is with traditional static load test.
2. according to the device of the described method of claim 1, it is characterized in that: it comprises the oil pump (2) that pressure meter (1) is housed, settling data Acquisition Instrument (3), bearing (6), datum line beam (7), settlement sensor instrument (8), jack (9), bearing plate (10), skin are covered with the rigid platfor (11) of airtight material (12), Pressure monitoring instrument (13), vacuum air pump (14); Rigid platfor (11) is installed on tested test pile (5) the foundation anti-seepage layer (4) on every side, test pile (5) end face in the rigid platfor (11) from down and on bearing plate (10) and jack (9) are housed successively, on bearing plate (10) end face bearing (6) is housed, sedimentation sensing instrument (8) is installed on the datum line beam (7), its gage outfit contacts with bearing (6) end face, and rigid platfor (11) is circumscribed with oil pump (2), settling data Acquisition Instrument (3), Pressure monitoring instrument (13), vacuum air pump (14).
3. the device of vacuum negative pressure static force pile testing according to claim 2 is characterized in that: said rigid platfor (11) be shaped as square terrace with edge or conical round platform.
4. according to the device of the described method of claim 1, it is characterized in that: it comprises the oil pump (2) that pressure meter (1) is housed, settling data Acquisition Instrument (3), bearing (6), datum line beam (7), settlement sensor instrument (8), jack (9), bearing plate (10), skin are covered with the rigid platfor (19) of airtight material (18), Pressure monitoring instrument (13), vacuum air pump (14); Rigid platfor (19) is installed on tested test pile (5) the foundation anti-seepage layer (4) on every side with buttress (16) support, test pile (5) end face in the rigid platfor (19) from down and on bearing plate (10), jack (9) and backing plate (22) are housed successively, on bearing plate (10) end face bearing (6) is housed, sedimentation sensing instrument (8) is installed on the datum line beam (7), its gage outfit contacts with bearing (6) end face, and rigid platfor (11) is circumscribed with oil pump (2), settling data Acquisition Instrument (3), Pressure monitoring instrument (13), vacuum air pump (14).
5. vacuum negative pressure static force pile testing device according to claim 4, it is characterized in that: can contact and the top cylinder (21) that is connected with bolt (17) with suspension cable (20) with backing plate (22) below be equipped with at rigid platfor (19) center that said skin is covered with airtight material (18), suspension cable (20) other end is connected with bolt (17) with the periphery of rigid platfor (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02112124 CN1385586A (en) | 2002-06-17 | 2002-06-17 | Vacuum negative pressure static force pile testing method and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02112124 CN1385586A (en) | 2002-06-17 | 2002-06-17 | Vacuum negative pressure static force pile testing method and device thereof |
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| Publication Number | Publication Date |
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| CN1385586A true CN1385586A (en) | 2002-12-18 |
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| CN 02112124 Pending CN1385586A (en) | 2002-06-17 | 2002-06-17 | Vacuum negative pressure static force pile testing method and device thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100422449C (en) * | 2006-05-30 | 2008-10-01 | 中国科学院力学研究所 | Nective pressure detecting device of suction base test |
| CN101915648A (en) * | 2010-07-09 | 2010-12-15 | 北京交通大学 | Device for testing low cycle repetitive load |
| CN102392463A (en) * | 2011-10-12 | 2012-03-28 | 浙江宝业建设集团有限公司 | Pile foundation static loading test device |
| CN103195110A (en) * | 2013-03-29 | 2013-07-10 | 天津大学 | Stable bucket-shaped foundation sinking negative pressure testing device |
| CN104674861A (en) * | 2015-03-11 | 2015-06-03 | 上海申元岩土工程有限公司 | Self-propelled static test vehicle |
| CN104929160A (en) * | 2015-05-08 | 2015-09-23 | 浙江元本检测技术有限公司 | Vacuum negative pressure static test pile technical method |
| CN105509683A (en) * | 2014-09-22 | 2016-04-20 | 贵州中建建筑科研设计院有限公司 | Displacement measuring device used for self-balance pile testing method |
| US11994193B2 (en) * | 2020-12-15 | 2024-05-28 | Dana Belgium N.V. | Compact driveline |
-
2002
- 2002-06-17 CN CN 02112124 patent/CN1385586A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100422449C (en) * | 2006-05-30 | 2008-10-01 | 中国科学院力学研究所 | Nective pressure detecting device of suction base test |
| CN101915648A (en) * | 2010-07-09 | 2010-12-15 | 北京交通大学 | Device for testing low cycle repetitive load |
| CN102392463A (en) * | 2011-10-12 | 2012-03-28 | 浙江宝业建设集团有限公司 | Pile foundation static loading test device |
| CN103195110A (en) * | 2013-03-29 | 2013-07-10 | 天津大学 | Stable bucket-shaped foundation sinking negative pressure testing device |
| CN105509683A (en) * | 2014-09-22 | 2016-04-20 | 贵州中建建筑科研设计院有限公司 | Displacement measuring device used for self-balance pile testing method |
| CN105509683B (en) * | 2014-09-22 | 2020-04-24 | 贵州中建建筑科研设计院有限公司 | Displacement measuring device for self-balancing pile testing method |
| CN104674861A (en) * | 2015-03-11 | 2015-06-03 | 上海申元岩土工程有限公司 | Self-propelled static test vehicle |
| CN104929160A (en) * | 2015-05-08 | 2015-09-23 | 浙江元本检测技术有限公司 | Vacuum negative pressure static test pile technical method |
| US11994193B2 (en) * | 2020-12-15 | 2024-05-28 | Dana Belgium N.V. | Compact driveline |
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