CN2550751Y - Vacuum negative pressure static pile test device - Google Patents
Vacuum negative pressure static pile test device Download PDFInfo
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- CN2550751Y CN2550751Y CN 02264853 CN02264853U CN2550751Y CN 2550751 Y CN2550751 Y CN 2550751Y CN 02264853 CN02264853 CN 02264853 CN 02264853 U CN02264853 U CN 02264853U CN 2550751 Y CN2550751 Y CN 2550751Y
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- rigid platfor
- bearing
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Abstract
The utility model discloses a vacuum and negative pressure statical device for testing piles; wherein, a rigid platform is arranged on a foundation anti-seepage layer around a test pile; a bearing plate and a jack are arranged at the test pile end in the rigid platform, a support is arranged at one end face of the bearing plate, and a sedimentation sensor is arranged on a datum beam; the measuring head of the sedimentation sensor contacts with the end face of the support, and the rigid platform is connected with an oil pump, a sedimentation data acquisition device, an air pressure monitoring device and a vacuum air pump. During testing, the vacuum air pump is used to extract air to obtain a certain vacuum degree, and when the rigid platform can provide adequate counterforce required for applying pressure on test piles, the jack can be used to apply corresponding load and perform relevant measuring operations; meanwhile, air extraction is done at proper time if necessary, so as to maintain a required vacuum degree. The subsequent steps are the same as those adopted in traditional static load tests. The utility model has the advantages of simple structure, convenient operations, capability of simulating the working conditions of piles as good as traditional static tests, and broad application prospect.
Description
Technical field
The utility model relates to a kind of vacuum negative pressure static force pile testing 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 purpose of this utility model is to design a kind of vacuum negative pressure static force pile testing device that adopts atmospheric pressure that the required counter-force of test pile is provided, and its equipment is simple, and is easy to operate, can simulate the practical working situation of stake.
Principle of the present utility model is similar with the quiet lotus test principle of anchoring pile method with the heavy method of conventional stack, and different is that this device adopts atmospheric pressure to provide test pile to load required counter-force.But should on-test for the previous period, make one deck foundation anti-seepage layer around the test pile, under the atmospheric pressure effect, enter the region of no pressure to prevent underground water or air in soil body.In the test preparatory stage, install and connect compression system, settlement measurement system, air-extractor, 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 lifting jack, simultaneously as required, bleed at any time, to keep the vacuum necessary degree.Follow-up step is with traditional static load test.
The technical solution adopted in the utility model is:
Scheme 1:
It comprises is equipped with manometric oil pump, the settling data Acquisition Instrument, and bearing, datum line beam, sedimentation sensing instrument, lifting 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 lifting jack are housed successively, on the bearing plate end face bearing is housed, sedimentation sensing instrument is installed on the datum line beam, its measuring head 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.
Scheme 2:
It comprises is equipped with manometric oil pump, the settling data Acquisition Instrument, and bearing, datum line beam, sedimentation sensing instrument, lifting 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, lifting 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, its measuring head 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 utlity model 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 tightness is 85～90%, the counter-force (rigid platfor weight is as safety margin) 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 utlity model has application prospects.
Description of drawings
Fig. 1 is a kind of box structure principle schematic of the present utility model;
Fig. 2 is an another kind of beveled structure principle schematic of the present utility model;
Fig. 3 is the umbrella shape frame vertical view of Fig. 2.
Embodiment
As shown in Figure 1, it comprises the oil pump 2 that tensimeter 1 is housed, settling data Acquisition Instrument 3, and bearing 6, datum line beam 7, settlement sensor instrument 8, lifting 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 lifting 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 measuring head 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 tensimeter 1 is housed, settling data Acquisition Instrument 3, bearing 6, datum line beam 7, settlement sensor instrument 8, lifting jack 9, bearing plate 10, skin is covered with the rigid platfor 19 of 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, lifting 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 measuring head 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 utility model 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 lifting 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 tightness after bleeding; Lifting jack, datum line beam and sedimentation sensing instrument also are installed in this space.Lifting jack is connected 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 tightness in the seal cavity at any time.
When using this device, must guarantee that impermeability and barrier properties are good, so that inside can keep higher vacuum tightness and watertightness; Must after providing enough counter-force to lifting jack, rigid platfor can apply corresponding load; Have only all to unsnatch and to exit after the load, the cancellation vacuum.
Claims (4)
1. vacuum negative pressure static force pile testing device, it is characterized in that: it comprises the oil pump (2) that tensimeter (1) is housed, settling data Acquisition Instrument (3), bearing (6), datum line beam (7), settlement sensor instrument (8), lifting 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 lifting 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 measuring head 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).
2. vacuum negative pressure static force pile testing device according to claim 1 is characterized in that: said rigid platfor (11) be shaped as square terrace with edge or conical round platform.
3. vacuum negative pressure static force pile testing device, it is characterized in that: it comprises the oil pump (2) that tensimeter (1) is housed, settling data Acquisition Instrument (3), bearing (6), datum line beam (7), settlement sensor instrument (8), lifting 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), lifting 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 measuring head 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).
4. vacuum negative pressure static force pile testing device according to claim 3, 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 02264853 CN2550751Y (en) | 2002-06-17 | 2002-06-17 | Vacuum negative pressure static pile test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02264853 CN2550751Y (en) | 2002-06-17 | 2002-06-17 | Vacuum negative pressure static pile test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2550751Y true CN2550751Y (en) | 2003-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02264853 Expired - Fee Related CN2550751Y (en) | 2002-06-17 | 2002-06-17 | Vacuum negative pressure static pile test device |
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| CN (1) | CN2550751Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839001A (en) * | 2010-05-27 | 2010-09-22 | 关喜才 | Compressive pile load detection device and method |
| CN102277884A (en) * | 2011-05-17 | 2011-12-14 | 浙江大学城市学院 | Device for treating pile head for vertical static load test and construction method thereof |
| CN104988956A (en) * | 2015-05-20 | 2015-10-21 | 河海大学 | Device for testing stress condition of pile group under asymmetric edge loads |
| CN113047349A (en) * | 2021-03-18 | 2021-06-29 | 中国地质大学（武汉） | Model test device and test method for vacuum negative pressure static test pile |
-
2002
- 2002-06-17 CN CN 02264853 patent/CN2550751Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101839001A (en) * | 2010-05-27 | 2010-09-22 | 关喜才 | Compressive pile load detection device and method |
| CN102277884A (en) * | 2011-05-17 | 2011-12-14 | 浙江大学城市学院 | Device for treating pile head for vertical static load test and construction method thereof |
| CN102277884B (en) * | 2011-05-17 | 2013-05-22 | 浙江大学城市学院 | Device for treating pile head for vertical static load test and construction method thereof |
| CN104988956A (en) * | 2015-05-20 | 2015-10-21 | 河海大学 | Device for testing stress condition of pile group under asymmetric edge loads |
| CN104988956B (en) * | 2015-05-20 | 2016-11-02 | 河海大学 | A kind of determinator of clump of piles stress under the load effect of asymmetric limit |
| CN113047349A (en) * | 2021-03-18 | 2021-06-29 | 中国地质大学（武汉） | Model test device and test method for vacuum negative pressure static test pile |
| CN113047349B (en) * | 2021-03-18 | 2021-11-26 | 中国地质大学（武汉） | Model test device and test method for vacuum negative pressure static test pile |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |