CN204311472U - Static pressure pipe pile visual pile sinking number device for picking - Google Patents
Static pressure pipe pile visual pile sinking number device for picking Download PDFInfo
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- CN204311472U CN204311472U CN201420757541.4U CN201420757541U CN204311472U CN 204311472 U CN204311472 U CN 204311472U CN 201420757541 U CN201420757541 U CN 201420757541U CN 204311472 U CN204311472 U CN 204311472U
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Abstract
The utility model relates to a kind of static pressure pipe pile visual pile sinking number device for picking, comprise model casing, reaction frame, vertical loading system and data collecting system, described reaction frame is arranged on the top of model casing, described vertical loading system is arranged on reaction frame, two adjacent walls of described model casing are transparent tempered glass, another two adjacent walls of this model casing are steel plate, described vertical loading system comprises servomotor and vertical propulsion arm, described reaction frame is detachably provided with positioning catheter, this positioning catheter is positioned at immediately below sleeve pipe, described data collecting system comprises pressure sensor and is provided with the control panel of integrated circuit, described pressure sensor is arranged on vertical propulsion arm.Model casing of the present utility model is visual, loading system automation, data acquisition and control automatization, the operation of a single jacked pile clump of piles are all easy, and the utility model precisely can gather pile tube residual stress easily.
Description
Technical field
The utility model relates to a kind of static pressure pipe pile visual pile sinking number device for picking.
Background technology
The advantages such as PHC pile tube (prestressed high-strength concrete pile) is high with its bearing capacity, strong adaptability, manufacture and speed of application are fast become a kind of pile foundation form extensively adopted.Study its sinking mechanism and behavior o f bearing capacity significant, factor is less carries out because test conditions is complicated, the test period is long, costly etc. for test in situ, indoor model test is more and more subject to focus of attention as a kind of effective means, model equipment is the hardware condition of test, its function directly affects quality and the conclusion reliability of test, therefore research and development pilot model apparatus has important scientific research value.Though pressed pile test equipment is being developed in recent years, but still there is suitable deficiency.Static pressure pipe pile residual stress is the related stress be trapped in after the off-load of stake top in stake, mainly comprises pile body residual stress, the remaining unit frictional resistance power in stake side, stake end residual stress.Whether can residual stress exist and accurately be estimated or measure and have material impact to bearing capacity of pile foundation proterties.Be below that current static pressure pipe pile testing equipment some shortcomings and residual stress measure present Research:
(1) the test model case size that adopts of most scholar is general all relatively little, and test can be subject to the restriction of indoor model dimensional effect, and the research about penetrating resistance and bearer properties is inevitably subject to the impact of boundary effect;
(2) current indoor pile pressing device visualization device does not have or degree is lower, soil compaction during pile driving change in displacement range of observation is limited, particularly studying the observation of static pressure Pile groups' compaction effect should be multi-angle, is therefore inevitably subject to the low impact of visualization for the interactional thin sight research of stake Soil Interface;
(3) the whether convenient accuracy being accurately directly connected to test result of silent piling loading system.Loading system conventional at present has reaction frame to add jack loading system, the rear hand-driven portable static penetrometer loading system two kinds of repacking, the two all controls pile sinking by the hand rotation of manpower and loads, so be affected by human factors very large consequently result of the test still there is very large unstability.At present open " a kind of model test apparatus of simulating Jacked Pile Driving ", a kind of manual-chain formula static penetrometer that adopts is disclosed as the Jacked Pile Driving model test apparatus of loading system.This technical scheme has can the injection soil body continuously, the advantages such as pile sinking speed Non-follow control, but, pile driving process is still and adopts the hand control of manpower, and static pressed pile is a time-consuming slow process of requiring great effort, this piling mode is still affected by human factors large measurement result reliability and cannot be guaranteed;
(4) common static pressure pipe pile test mostly is single pile test, and pile sinking loading system position is fixed mobile inconvenient usually, and need repeatedly convert pile sinking position for the indoor model test of a clump of piles.Current static(al) pile tube test or complicated operation when only pressing that single pile or top loading equipemtn are too heavy changes stake position.Therefore the design and development for the experimental rig being convenient to a static pressure clump of piles has important scientific research value and realistic meaning;
(5) to load and unload cumbersome efficiency low testing in preparation and terminal procedure at present test soil (sand), test soil (sand) needs repeatedly to cross over higher model casing height from model casing exterior cartonning internal procedure, if by testing crew manpower lift packing in iron drums soil in this process, compare effort and easy collision model case glass one side, also may there is certain influence to soil compaction effect.
External more domestic to Study on Residual Stresses early, the model investigation report for static pressure pipe pile residual stress is very few.Consider the factor impacts such as field trial condition, economy and time, measure residual stress and be difficult to carry out or accurately record.Therefore based on indoor static pressure pile tube experimental study residual stress, there is irreplaceable advantage.Residual stress considers the stress of time effect after being namely the off-load of stake top, the whether accurate residual stress that is directly connected to that therefore pile body stress measures obtains.Current stress method for measurement is comparatively simple, and result of the test error is larger.After most experimenter adopts the direct outer wall in stake stickup foil gauge to smear the antifriction material that comes off again, piling enters indigenous method.Foil gauge must be subject to the extruding impact of soil around pile, adds the chemical material spread upon on foil gauge and the external diameter of stake herein is to a certain degree increased, whole pile body likeness in form " calabash bunch ", and the actual loading situation of stake changes, and simulate effect is difficult to realize.
Summary of the invention
The technical problems to be solved in the utility model is: for the deficiency of current static pressure pipe pile experimental rig, provides that a kind of pressed pile test device is visual, the visual several device for picking of static pressure pipe pile that loading system automation, data acquisition and control automatization, the operation of a single jacked pile clump of piles are all easy.
The technical scheme solved the problems of the technologies described above is: a kind of static pressure pipe pile visual pile sinking number device for picking, comprise model casing, reaction frame, vertical loading system and data collecting system, described reaction frame is arranged on the top of model casing, described vertical loading system is arranged on reaction frame, two adjacent walls of described model casing are transparent tempered glass, another two adjacent walls of this model casing are steel plate, the side steel plate of this model casing is made up of steel plate I and steel plate II, described steel plate I is fixedly mounted on model casing, described steel plate II is the top being detachably arranged on steel plate I, the bottom of described model casing is provided with roller, described vertical loading system comprises servomotor and vertical propulsion arm, vertical propulsion arm in described vertical loading system is provided with the sleeve pipe for Model Pile being connected with vertical propulsion arm, described reaction frame is detachably provided with positioning catheter, this positioning catheter is positioned at immediately below sleeve pipe, described data collecting system comprises pressure sensor and is provided with the control panel of integrated circuit, described pressure sensor is arranged on vertical propulsion arm.
Further technical scheme of the present utility model is: be placed with before the tempered glass of described model casing side for taking and the digital camera device of record cast case king-pile Soil Interface soil body particle change procedure.
Described steel plate II is inserted into the top of steel plate I by slot.
Length=the 100cm of described model casing, wide=100cm, height=130cm.
Described static pressure pipe pile visual pile sinking number device for picking comprises statical strain indicator, and the inwall of described Model Pile is provided with the foil gauge be connected with this statical strain indicator.
Owing to adopting technique scheme, the static pressure pipe pile visual pile sinking number device for picking of the utility model, has following beneficial effect:
1. model casing is visual: model casing two adjacent wall in the utility model adopts transparent tempered glass, as monitoring and shooting window.The only have range of observation of a tempered glass lower compared to current indoor pile pressing device degree expands, and is particularly useful for soil movement situation in observational study static pressure clump of piles pile driving process.And digital camera device can also be installed before tempered glass, micro-number is utilized to shoot with video-corder technology, adopt high-definition digital and stereomicroscope to shoot with video-corder in real time tempered glass region stake Soil Interface soil body particle, obtained the Changing Pattern of the main thin sight group structure parameter such as particle coordination number, inter-granular contact normal direction, particle long-axis orientation, locally porosity in stake soil load transmittance process by digital picture meso-scopic structure analysis software statistics; Obtain displacement field and the strain field change of soil body particle near static pressure pile-sinking pile Soil Interface, research and analyse pile tube bearing capacity characteristics and sinking mechanism.
2. model casing loads and unloads the raising of native efficiency: the model casing side steel plate in the utility model is made up of steel plate I and steel plate II, described steel plate I is fixedly mounted on model casing, described steel plate II is the top being detachably arranged on steel plate I, phase handling soil turnover window before and after test is can be used as after being extracted out by steel plate II, water proof rubber can be adopted after being laid by steel plate II to seal upper lower steel plate seam, ensure model casing good seal.
3. loading system, data acquisition and control automatization: comprise servomotor and vertical propulsion arm in vertical loading system of the present utility model, vertical propulsion arm is provided with pressure sensor, servomotor is regulated by the control panel being provided with integrated circuit and then pile settlement rate, displacement and pile driving pressure are controlled, ensure that Model Pile penetration process is accurate, operation facilitates automatically.And the pile driving pressure in process of the test is shown by pressure sensor and is saved in control panel, pile sinking is displaced through and carries out programming conversion to servomotor rotation process and obtain and show being saved in control panel, and utilizing data wire control panel to be connected personal computer derives related data and preserve; Pile strain data are connected to computer by statical strain indicator acquisition system and automatically preserve.
4. static pressure simple group stake operation is more convenient: be provided with roller bottom the model casing in the utility model, model casing comprehensively can move freely and change piling position, namely the motionless and ground foundation simulation of sinking apparatus moves, breach and traditional can only move top charger method, realize static pressure clump of piles object, the operation of the utility model static pressure clump of piles device is more convenient and piling efficiency is higher; And the model casing in the utility model all expands more than 1 times at the model casing of about 50cm compared to existing length, width and height size, the impact being subject to dimensional effect in ordinary test process is less, and the result of test gained is more fitted reality.
5. the utility model is directly adhesive with foil gauge at the inwall of Model Pile, and the wire of foil gauge is provided with osculum extraction by backing down in Model Pile, and avoiding foil gauge directly directly to contact with soil around pile affects by its crimp, and data acquisition science is accurate; Measure based on indoor model pile body stress and obtain residual stress, particularly accurate for static pressure pile tube measuring method scientific results of remaining silent.
Below, the technical characteristic in conjunction with Figure of description and the static pressure pipe pile of specific embodiment to the utility model visual pile sinking number device for picking is further described.
Accompanying drawing explanation
Fig. 1: the visual pile sinking number of the static pressure pipe pile in the utility model device for picking structural representation.
Fig. 2: the structural representation of model casing in the utility model.
In above-mentioned accompanying drawing, each label declaration is as follows:
1-model casing, 11-tempered glass, 12-steel plate, 121-steel plate I, 122-steel plate II, 13-roller, 2-reaction frame, 21-column, 22-reaction frame crossbeam, the vertical loading system of 22-crossbeam II, 3-, the vertical propulsion arm of 31-, 4-sleeve pipe, 5-positioning catheter, 6-computer, 7-platform, 8-statical strain indicator.
Detailed description of the invention
A kind of static pressure pipe pile visual pile sinking number device for picking, comprise model casing 1, reaction frame 2, vertical loading system 3, data collecting system and statical strain indicator 8, described reaction frame 2 is arranged on the top of model casing 1, and described vertical loading system 3 is arranged on reaction frame 2.
Described model casing 1 adopts angle steel as skeleton, and angle steel is of a size of 60 mm × 6, mm × 60 mm, the length=100cm of described model casing 1, wide=100cm, height=130cm.The inner volume V=1.3 m of model casing 1
3.Two adjacent walls of described model casing 1 are the thick transparent toughened glass of 12mm 11, can be used as monitoring and shooting window.Another two adjacent walls of this model casing 1 and base plate are the steel plate 12 of thick 6mm, the side steel plate of this model casing 1 is made up of steel plate I 121 and steel plate II 122, described steel plate I 121 is weldingly fixed on model casing 1, described steel plate II 122 is the top being detachably arranged on steel plate I 121, namely described steel plate II 122 is inserted into the top of steel plate I 121 by slot, make the movable extraction of steel plate II 122 and installation, phase handling soil turnover window before and after test is can be used as during extraction, improve the native efficiency of test handling, the upper lower steel plate seam of available water proof rubber sealing is adopted after installation, steel plate 12 and angle steel joint place adopt water proof rubber sealing, the joint place of tempered glass 11 and angle steel adopts glass marine glue bonding, the bottom of described model casing 1 is provided with roller 13, be convenient to model casing can all-around mobile to change piling position, overcome a charger position not malleable difficult problem, realize static pressure clump of piles object.Described model casing 1 side tempered glass 11 is placed with above for taking and the digital camera device of record cast case 1 king-pile Soil Interface soil body particle change procedure.
Described reaction frame 2 is made up of two H-shaped upright columns, 21, I shape reaction frame crossbeam 22.Described column 21 is fixedly connected with ground by bolt, enough pulling force can be provided, spacing between each column 21 is model casing 1 width twice, enough in order to model casing 1 position mobile space, be convenient to implement a static pressure clump of piles, reaction frame crossbeam 22 is bolted column, and described vertical loading system 3 is fixed in the middle part of reaction frame crossbeam 22.The vertical propulsion arm 31 in vertical loading system 3 is made to be positioned at reaction frame crossbeam 22 middle part, convenient loading.Described reaction frame 2 is provided with crossbeam II 22, and this crossbeam II 22 is positioned at below reaction frame crossbeam 22, and described crossbeam II 22 is detachably provided with positioning catheter 5, and this positioning catheter 5 is positioned at immediately below sleeve pipe 4.
Described vertical loading system 3 comprises servomotor and vertical propulsion arm 31, vertical propulsion arm 31 in described vertical loading system 3 is provided with for by connected for Model Pile steel sleeve pipe 4, vertical propulsion arm 31 is connected by sleeve pipe 4 with Model Pile, this sleeve pipe 4 inside is carved with screw thread and is rotated with vertical propulsion arm 31 and is screwed to half length and fixes, it is identical with this sleeve pipe 4 internal diameter that second half length of sleeve pipe 4 is inserted in an external diameter size again, the steel pipe that internal diameter is identical with full mould stake external diameter, guarantee that full mould stake stake top can just seamlessly be stretched into, this sleeve pipe 4 plays pile cover and guiding double effects, the positioning catheter 5 be located at below sleeve pipe 4 is vertical with sleeve pipe 4 centering, thus ensure that pile sinking can vertical injection.
Described data collecting system comprises pressure sensor and is provided with the control panel of integrated circuit, and described pressure sensor is arranged on vertical propulsion arm.Manipulation to pile settlement rate is completed by inputting Data Control servomotor on the control panel, and the pressure sensor be arranged on vertical propulsion arm and pile sinking displacement recorded data corresponding to electric machine rotation can turn back on control panel in real time, also by data wire, control panel is connected computer 6 and carry out data analysis and post processing, not only make the result of test very clear, can also the in real time progress of monitoring test Timeliness coverage problem, improve test efficiency.Computer 6 can be placed on platform 7, is convenient to data record.The inwall of described Model Pile is provided with the foil gauge be connected with this statical strain indicator 8, and the strain data of residual stress when utilizing statical strain indicator 8 to gather static pressure Model Pile, these data also can be connected in computer 6.
A kind of static pressure pipe pile residual stress method for measurement, measures residual stress during static pressure Model Pile with static pressure pipe pile visual pile sinking number device for picking, comprises the steps:
(1) when Model Pile is full mould stake, adopt linear cutter technology that Model Pile is obtained two half module stakes to slicing into halves, and paste foil gauge at the inwall equidistant (being generally 10cm) from bottommost to top of these two half module stakes, the wire adhesive tape sticking of foil gauge is drawn from upper end along inwall at half module stake inwall, then adopt and by these two half module stakes, the full mould stake of formation is pasted to metal material sticking effect good epoxide resin AB glue, the wire of foil gauge is provided with osculum extraction by backing down in Model Pile, inner for the upper end sleeve pipe 4 engraving screw thread is opened the vertical propulsion arm 31 after tooth with front end to be tightened fixing, then the Model Pile having pasted foil gauge is connected with vertical propulsion arm 31 by sleeve pipe 4, by roller 13, model casing 1 is moved to corresponding position (and moving to design stake position), then by Serve Motor Control vertical propulsion arm, Model Pile is carried out static pressure in model casing 1, utilize the strain data of the pile body residual stress after statical strain indicator 8 collection model stake process of press in pile stress and the off-load of stake top, and keeping records is on computer 6.
(2) when Model Pile is half module stake, directly paste foil gauge at the inwall equidistant (being generally 10cm) from bottommost to top of half module stake, the wire adhesive tape sticking of foil gauge is drawn from upper end along inwall at half module stake inwall, the wire of foil gauge is not closed side and is directly drawn from half module stake top, inside, upper end threaded sleeve pipe 4 at quarter is opened the vertical propulsion arm 31 after tooth with front end to be tightened fixing, segment semicircle steel pipe identical with its radius for the half module stake stake top portion having pasted foil gauge is loaded sleeve pipe 4 to being combined into full mould stake top and together overlapping, this half module stake is connected with vertical propulsion arm 31.Change the positioning catheter 5 on reaction frame 2 into semicircular conduit, by roller 13, model casing 1 is moved to corresponding position, by Serve Motor Control vertical propulsion arm, half module stake is close in the tempered glass press-in model casing 1 of model casing 1 sidewall, utilize the strain data of the pile body residual stress after statical strain indicator 8 collection model stake process of press in pile stress and the off-load of stake top, and keeping records is on computer 6.
Described Model Pile is steel pipe pile or aluminum pipe stake.
One as the present embodiment converts: the half module stake having pasted foil gauge can also be fixed by bolt and be sleeved in sleeve pipe 4, this half module stake is connected with vertical propulsion arm 31.
When carrying out static pressure pipe pile test, first filling test soil (sand) in model casing 1, when filling first half soil, first can extract model casing side steel plate II 122 out, expose the native delivery windows of test, improving test and fill native efficiency, when banketing being loaded on steel plate II 122 water proof rubber sealing upper lower steel plate seam during this window's position of arrival, continuing to complete latter half soil.Selection experiment Model Pile is passed positioning catheter 5 and is stretched into supporting sleeve pipe 4 and fixed, and after fine setting crossbeam II 22 determines that pile body is vertical, after piling position determined by the model casing 1 promoting to can move freely, surrounding at the bottom of case places fixing stopper fixed die molding box 1.Open vertical loading system 3, control servomotor and then control vertical propulsion arm 31 to push up pressing mold type sunk pile with control panel, pile settlement rate is 0.02mm/s-5mm/s, pile driving pressure in process of the test is by the pressure sensor record be arranged on vertical propulsion arm 31, pile sinking displacement is rotated programming conversion by servomotor and is drawn, pile driving pressure and displacement data real time record are also reflected in control panel, by data wire, these data are transferred to computer 6 observation analysis.After Model Pile pile sinking terminates, as long as readjust next pile of mobility model case 1 static pressure, realize the object of a static pressure clump of piles by that analogy.Adopt high-definition digital and stereomicroscope to shoot with video-corder in real time tempered glass region stake Soil Interface soil body particle in pile driving process simultaneously, by displacement field and the strain field change of soil body particle near Image Post-processing Techniques analysis pressure pile driving process king-pile Soil Interface, and then research and analyse pile tube bearing capacity characteristics and sinking mechanism.
Static pressure pipe pile indoor model test pile body residual stress measure abandon at present normal adopt directly paste foil gauge measuring method on Model Pile surface, select the method for pasting foil gauge at stake inwall, avoid affecting by soil around pile crimp.After static pressure pipe pile off-load, consider time effect, the statical strain indicator 8 sample record foil gauge data that employing can work long hours, the stress numerical of each foil gauge record is exactly relevant position pile body residual stress, physical mathematics method is used easily to know pile body force analysis, stake end foil gauge measures the stress obtained and can be approximately stake end residual stress, and adjacent two foil gauges record axle force value difference and are the remaining frictional resistance in the average stake side of pile body between this foil gauge.Therefore adopt said method can obtain the change of different times static pressure pipe pile residual stress by accurate measurement, and then provide useful guidance for studying pile tube bearing capacity.Static pressure pipe pile residual stress calculation formula is specific as follows:
(1) pile body residual stress:
;
(2) the remaining unit frictional resistance power in stake side:
, the remaining axle power of pile body:
;
(3) stake end residual stress:
; Stake end residual resistive:
;
Wherein:
for from Model Pile inwall lowermost end, number consecutively is 1,2 ... the foil gauge numerical value of i;
for foil gauge i position pile shaft force, such as:
,
namely adjacent stake bottom pile body stress and axle power is respectively;
for foil gauge i, area outside the pile body between i+1;
for pile body cross-sectional area;
for pile shaft material modulus of elasticity.
Claims (5)
1. a static pressure pipe pile visual pile sinking number device for picking, it is characterized in that: comprise model casing (1), reaction frame (2), vertical loading system (3) and data collecting system, described reaction frame (2) is arranged on the top of model casing (1), described vertical loading system (3) is arranged on reaction frame (2), two adjacent walls of described model casing (1) are transparent tempered glass (11), another two adjacent walls of this model casing (1) are steel plate (12), the side steel plate (12) of this model casing (1) is made up of steel plate I (121) and steel plate II (122), described steel plate I (121) is fixedly mounted on model casing (1), described steel plate II (122) is the top being detachably arranged on steel plate I (121), the bottom of described model casing (1) is provided with roller (13), described vertical loading system (3) comprises servomotor and vertical propulsion arm (31), vertical propulsion arm (31) in described vertical loading system (3) is provided with the sleeve pipe (4) for Model Pile being connected with vertical propulsion arm (31), described reaction frame (2) is detachably provided with positioning catheter (5), this positioning catheter (5) is positioned at immediately below sleeve pipe (4), described data collecting system comprises pressure sensor and is provided with the control panel of integrated circuit, described pressure sensor is arranged on vertical propulsion arm (31).
2. static pressure pipe pile according to claim 1 visual pile sinking number device for picking, is characterized in that: described model casing (1) side tempered glass (11) is placed with above for shooting and the digital camera device of record cast case (1) king-pile Soil Interface soil body particle change procedure.
3. static pressure pipe pile according to claim 1 visual pile sinking number device for picking, is characterized in that: described steel plate II (122) is inserted into the top of steel plate I (121) by slot.
4. the static pressure pipe pile visual pile sinking number device for picking according to the arbitrary claim of claim 1-3, is characterized in that: length=100cm, wide=100cm, the height=130cm of described model casing (1).
5. static pressure pipe pile according to claim 4 visual pile sinking number device for picking, is characterized in that: described static pressure pipe pile visual pile sinking number device for picking comprises statical strain indicator, and the inwall of described Model Pile is provided with the foil gauge be connected with this statical strain indicator.
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| CN201420757541.4U CN204311472U (en) | 2014-12-04 | 2014-12-04 | Static pressure pipe pile visual pile sinking number device for picking |
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| CN201420757541.4U CN204311472U (en) | 2014-12-04 | 2014-12-04 | Static pressure pipe pile visual pile sinking number device for picking |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452834A (en) * | 2014-12-04 | 2015-03-25 | 广西科技大学 | Visual pile-sinking data acquisition device for static-pressure pipe pile and residual stress measurement method |
| CN110629812A (en) * | 2019-10-25 | 2019-12-31 | 中铁第四勘察设计院集团有限公司 | Loading test device and method for vertical dynamic and static loads of single pile |
-
2014
- 2014-12-04 CN CN201420757541.4U patent/CN204311472U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452834A (en) * | 2014-12-04 | 2015-03-25 | 广西科技大学 | Visual pile-sinking data acquisition device for static-pressure pipe pile and residual stress measurement method |
| CN104452834B (en) * | 2014-12-04 | 2016-04-06 | 广西科技大学 | Static pressure pipe pile visual pile sinking number device for picking and residual stress method for measurement |
| CN110629812A (en) * | 2019-10-25 | 2019-12-31 | 中铁第四勘察设计院集团有限公司 | Loading test device and method for vertical dynamic and static loads of single pile |
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