CN105002939A - Model device and method for grouped pile field test - Google Patents
Model device and method for grouped pile field test Download PDFInfo
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- CN105002939A CN105002939A CN201510456473.7A CN201510456473A CN105002939A CN 105002939 A CN105002939 A CN 105002939A CN 201510456473 A CN201510456473 A CN 201510456473A CN 105002939 A CN105002939 A CN 105002939A
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Abstract
The invention relates to a model device and method for a grouped pile field test. The model device comprises anchor piles, a positioning and supporting device, a counterforce plate, model piles, a bearing platform, a jack, a load sensor, dial indicators, a programmable static strain indicator, a data processing computer, a numerical value force measuring instrument and a resistance strain gauge. The model piles are fixed below the bearing platform. A bearing platform cover plate is arranged on the upper surface of the bearing platform. The positioning and supporting device comprises an upper frame, a lower frame and a telescopic stand column. The upper frame and the lower frame are connected through the stand column. Connecting plates are arranged in the middle of the upper frame and the middle of the lower frame respectively. Telescopic rods are arranged at the four corners of each connecting plate respectively. Limiting rings are arranged at the ends of the telescopic rods. Water levels are arranged on the connecting plates. According to the model device and method for the grouped pile field test, the positioning and supporting device can be used for positioning the model piles and ensuring perpendicularity and ensuring levelness of the tops of the grouped piles and the bearing platform. The device is simple in structure, flexible, easy and convenient to operate, high in measuring precision and good in economic benefit.
Description
Technical field
The present invention relates to Geotechnical Engineering field, more particularly, relate to a kind of model equipment and method of clump of piles field trial.
Background technology
Pile foundation is a kind of common base form, is widely used in the engineerings such as building, bridge, harbour.A clump of piles is as a kind of principal mode of pile foundation, and the research of its stress deformation characteristic is subject to people's attention always.
In pile foundation engineering, the prototype experiment carrying out a clump of piles needs a large amount of human and material resources of cost and time, or because the restriction of the factors such as site condition cannot carry out prototype test, under these conditions, a kind of effective ways that on-the-spot clump of piles model testing becomes research, explores and deal with problems.The theoretical research that it is not only pile foundation provides experimental data and testing and verification, and provides according to for engineering design and then instruct engineering practice.
Site-models test combines the advantage of field trial and indoor model test: it ensures the integrality of soil structures on the one hand, has higher accuracy compared to indoor model; Cost-saving compared to on-the-spot prototype test on the other hand, shorten the test period.
In existing clump of piles site-models process of the test, Model Pile be under many circumstances manually method press-in, in the process of press-in, easily there is crooked situation in Model Pile, adjustment can only be gone by macroscopic method, the levelness on the verticality of Model Pile and the stake top of a clump of piles all cannot ensure, causes the accuracy of measurement result to reduce.
Summary of the invention
The technical problem to be solved in the present invention is, provide a kind of model equipment and method of clump of piles field trial, this device can ensure the verticality of each Model Pile, and flexible operation is easy, measures precision high.
The present invention solves this technical problem adopted technical scheme: the model equipment constructing a kind of clump of piles field trial, comprises anchoring pile, reaction plate, device for positioning and supporting, Model Pile, cushion cap, jack, load sensor, dial gage, program control statical strain indicator, data processing computer, numerical value dynamometer and resistance strain gage;
It is inner that described resistance strain gage is arranged on described Model Pile, and described Model Pile has many, and many Model Pile are fixed on below described cushion cap, and described cushion cap upper surface arranges cushion cap cover plate; Described jack is arranged between cushion cap cover plate and load sensor, and described load sensor is connected with described numerical value dynamometer; Described wire is connected with described program control statical strain indicator, and described program control statical strain indicator is connected with described data processing computer; Described dial gage is arranged on above cushion cap cover plate by datum line beam; Described anchoring pile is divided into two rows and is fixed in ground, is provided with support column between described reaction plate and ground;
Described device for positioning and supporting comprises upper frame, underframe and telescopic column, described upper frame is connected by column with underframe, the middle part of described upper frame and underframe is provided with junction plate, four angles of described junction plate arrange expansion link respectively, the end of described expansion link is provided with spacing collar, and described junction plate is provided with bubble.
In such scheme, described spacing collar comprises the circle body of two semicircles, and one end of two circle bodies is hinged, and the other end is connected by fastener.
In such scheme, described underframe is provided with cantilever, and described cantilever is placed on datum line beam.
In such scheme, the bottom of described underframe is provided with fixing feet.
In such scheme, described expansion link, upper frame and underframe are provided with rule.
In such scheme, described reaction plate is connected by wire rope with anchoring pile, the fixed end of described wire rope is fixedly connected on described reaction plate by steel pipe, and the movable end of described wire rope is passed by the wire rope fairlead on anchoring pile, and stretching by steel cable clamp fastening.
In such scheme, described Model Pile is connected with described cushion cap by nut, and described cushion cap is provided with multiple installing hole coordinated with Model Pile.
In such scheme, described cushion cap cover plate is provided with positioning boss, and described positioning boss contacts with the stress surface of jack.
In such scheme, the surface of described positioning boss is provided with groove.
Present invention also offers a kind of test method utilizing above-mentioned experimental rig, comprise the following steps:
Anchoring pile is arranged in S1, location press-in two;
S2, reference for installation beam stationary positioned bracing or strutting arrangement, Model Pile is through spacing collar, many Model Pile of resistance strain gage are posted in press-in successively, by bubble leveling in the process of press-in, ensure the verticality of Model Pile and the uniformity of Ge Gen Model Pile stake heights of roofs; The column of positioning supports is scalable, guarantees the verticality of whole piling process model stake;
S3, Model Pile to be fixed on below cushion cap, and to place cushion cap cover plate at cushion cap upper surface;
S4, installation jack, connect load sensor, program control statical strain indicator, data processing computer, numerical value dynamometer;
S5, installation support column, be placed in reaction plate on support column, be fixed on by steel pipe on reaction plate, connect anchoring pile and reaction plate with wire rope, and stretching with steel cable clamp fastening;
S6, dial gage are arranged on above cushion cap cover plate by datum line beam;
S7, utilize load sensor and numerical value dynamometer, realize the accurate hierarchical loading of jack, dial gage records cushion cap sedimentation, and program control statical strain indicator records pile strain, and data processing computer record analyzes strain data.
Implement model equipment and the method for clump of piles field trial of the present invention, there is following beneficial effect:
1, device for positioning and supporting can play location to each Model Pile and ensure the effect of verticality, further ensures whole clump of piles stake top level, thus ensures cushion cap level.
2, the distance between device for positioning and supporting spacing collar can be regulated by expansion link, is applicable to a clump of piles for piles with different spacing.
3, column can stretch, and the height of upper frame can regulate along with pile driving process, makes the verticality of Model Pile in pile driving process obtain real-time control.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the front view of the model equipment of clump of piles field trial of the present invention;
Fig. 2 is the lateral view of the model equipment of clump of piles field trial of the present invention;
Fig. 3 is the connection diagram of Model Pile, cushion cap and cushion cap cover plate;
Fig. 4 is the structural representation of cushion cap;
Fig. 5 is the structural representation of Model Pile;
Fig. 6 is the structural representation of cushion cap cover plate;
Fig. 7 is the connection diagram of reaction plate and anchoring pile;
Fig. 8 is the structural representation of steel cable clamp;
Fig. 9 is the structural representation of device for positioning and supporting;
Figure 10 is the top view that device for positioning and supporting is arranged on datum line beam.
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
As shown in Figures 1 to 10, the model equipment of clump of piles field trial of the present invention comprises 1, datum line beam, 2, dial gage, 3, cushion cap cover plate, 4, cushion cap, 5, jack, 6, load sensor, 7, nut, 8, Model Pile, 9, wire fairlead, 10, bolt hole, 11, anchoring pile, 12, wire rope fairlead, 13, bearing sheet, 14, wire rope, 15, reaction plate, 16, wire rope fixing hole, 17, program control statical strain indicator, 18, data processing computer, 19, numerical value dynamometer, 20, steel cable clamp, 21, steel pipe, 22, Model Pile preformed hole, 23, resistance strain gage, 24, wire, 25, support column, 26, junction plate, 27, column, 28, spacing collar, 29, bubble, 30, expansion link, 31, fastener, 32, cantilever, 33, fixing feet, 34, underframe, 35, upper frame.
It is inner that resistance strain gage 23 is arranged on Model Pile 8, and Model Pile 8 has many, and many Model Pile 8 are fixed on below cushion cap 4, and cushion cap 4 upper surface arranges cushion cap cover plate 3.The stake top of Model Pile 8 connects cushion cap 4 by two traveling nuts 7, and the nut 7 being fixed on cushion cap 4 bottom surface bears the load of cushion cap 4 transmission.Model Pile 8 adopts line cutting technology, and not exclusively cut open on stake top and each reserved certain length of stake end, pile body arranges bolt hole 10 at interval of a segment distance, and is symmetrical arranged two wire fairleads 16 pushing up a distance apart from stake.The bottom of Model Pile 8 is provided with back cover, and inside Model Pile 8, different cross section posts resistance strain gage 23.
Jack 5 is arranged between cushion cap cover plate 3 and reaction plate 15, and load sensor 6 is connected with numerical value dynamometer 19, and wire 24 is connected with program control statical strain indicator 17, and program control statical strain indicator 17 is connected with data processing computer 18.Dial gage 2 is arranged on above cushion cap cover plate 3 by datum line beam 1, and in the present embodiment, dial gage 2 arranges four, is measured the sedimentation of cushion cap 4 by dial gage 2.Four Model Pile preformed holes 22 are had bottom cushion cap 4, Model Pile 8 heights of roofs is lower than cushion cap 4 height, cushion cap 4 is cuboid, middle baffled support, cushion cap 4 is divided into 4 intervals, each angle place end face is welded with triangular steel plate, makes cushion cap 4 globality better, evenly can transmit the load of cushion cap cover plate 3 simultaneously.Cushion cap 4 can make according to piles with different spacing, stake number, stake footpath.Support column 25 is provided with between reaction plate 15 and ground.
Anchoring pile 11 is divided into two rows and is fixed in ground, wire rope 14 fixed end is through the wire rope fixing hole 16 on reaction plate 15, and be fixedly connected on reaction plate 15 by steel pipe 21, wire rope 14 movable end is passed by the wire rope fairlead 12 on anchoring pile 11, and stretching by steel cable clamp 20 fastening.Often arrange each four of anchoring pile 11, guarantee to be supplied to the enough counter-forces of a clump of piles by reaction plate 15.The height of each anchoring pile 11 is consistent, and is positioned at immediately below wire rope fixing hole 16, makes it point-blank, guarantees that wire rope 14 can uniform stressed.There is provided counter-force by reaction plate 15, anchoring pile 11 and wire rope 14, than other method flexible and convenient more, save experimentation cost and time.Wire rope 14 is stretching by steel cable clamp 20 fastening, can according to the position of different cushion cap 4 type adjustment reaction plate 15, wire rope 14 flexible operation, device of the present invention is set up and dismounting more time saving and energy saving.
Device for positioning and supporting comprises upper frame 35, underframe 34 and telescopic column 27.Upper frame 35 is connected by column 27 with underframe 34, the middle part of upper frame 35 and underframe 34 is provided with junction plate 26, four angles of junction plate 26 arrange expansion link 30 respectively, and the end of expansion link 30 is provided with the spacing collar 28 corresponding with Model Pile 8, junction plate 26 is provided with bubble 29.Underframe 34 is also provided with cantilever 32, and cantilever 32 is placed on datum line beam 1.
Be provided with fixing feet 33 bottom underframe 34, be convenient to insert ground internal fixtion.During press-in Model Pile 8, first pass the spacing collar 28 of upper frame 35 and underframe 34, and by bubble 29 eye-level degree, prevent deviation.Column 27 can stretch, and the height of upper frame 35 can regulate along with pile driving process, makes the verticality of Model Pile 8 in pile driving process obtain real-time control.
The spacing between each spacing collar 28 can be regulated to be suitable for the clump of piles model of piles with different spacing by expansion link 30.Expansion link 30, upper frame 35 and underframe 34 arrange rule, convenient adjustment.Be provided with fixing buckle in the middle part of expansion link 30, stretch after designated length by fixing snaps into position.
Spacing collar 28 comprises the circle body of two semicircles, and one end of two circle bodies is hinged, and the other end is connected by fastener 31.Model Pile 8 is taken fastener 31 apart and can be taken out device for positioning and supporting, can not interfere with each other with wire 24 after being pressed into.
Further, in order to improve the stability of bracing or strutting arrangement, bracing or strutting arrangement is also provided with cantilever 32, and cantilever 32 is placed on datum line beam 1, improves stability.
Further, cushion cap cover plate 3 is provided with positioning boss 301, and positioning boss 301 contacts with the stress surface of jack 5, guarantees that the loading of jack 5 is positioned at the position in axle center.The surface of positioning boss 301 is provided with groove 302, prevents jack 5 from offseting in the process loaded further.
Further, cushion cap cover plate 3 is provided with bubble 29, can be observed the levelness regulating cushion cap cover plate 3 by bubble 29.
Present invention also offers a kind of test method utilizing above-mentioned experimental rig, comprise the following steps:
S1, to keep at a certain distance away at Model Pile 8 inner surface and symmetrical paste two panels resistance strain gage 23, by terminal, resistance strain gage 23 is connected with wire 24, and wire 24 is drawn from the wire fairlead 9 of Model Pile 8 respectively; Closed model stake 8, at bolt hole 10 place, inserting bolt is fixed.
S2, by two row's wire rope fixing holes 16 on reaction plate 15, determine the position of burying of anchoring pile 11, respectively anchoring pile 11 is squeezed into foundation soil designated depth.
S3, by the Model Pile preformed hole 22 on cushion cap 4, Model Pile 8 is put into respectively the position, hole on foundation soil, to bury position in two row's anchoring pile 11 center Confirming model stakes 8.Reference for installation beam 1 is stationary positioned bracing or strutting arrangement also, spacing collar 28 corresponding aperture position on underframe 34 is placed, Model Pile 8 is through spacing collar 28, then the many Model Pile 8 of resistance strain gage 23 are posted in press-in successively, by bubble 29 leveling in process of press in, ensure the verticality of Model Pile 8 and the uniformity of Ge Gen Model Pile 8 heights of roofs.The column 27 of positioning supports is scalable, guarantees the verticality of whole piling process model stake 8.
S4, when ensureing verticality, Model Pile 8 being followed cushion cap 4 be pressed into appointment embedded depth clockwise successively; When the stake of all Model Pile 8 withstands on sustained height, remove device for positioning and supporting, make it to be connected with cushion cap 4 by Model Pile preformed hole 22 in position, stake top; By nut 7, cushion cap 4 is fixedly connected with Model Pile 8.
S5, cushion cap cover plate 3 is placed on cushion cap 4, jack 5 is placed in and is provided with on the cushion cap cover plate 3 of positioning boss 301, then on jack 5, place load sensor 6, and load sensor 6 is connected numerical value dynamometer 19; Wire 24 is connected with program control statical strain indicator 17, is connected with data processing computer 18 by data wire.
S6, reaction plate 15 is placed on support column 25; Be fixedly connected on reaction plate 15 by wire rope 14 fixed end by steel pipe 21, wire rope 14 movable end is passed by wire rope fairlead 12; Wire rope 14 is stretching by steel cable clamp 20 fastening, can control cushion cap 4 height reserved with reaction plate 15 flexibly by wire rope 14.
S7, datum line beam 1 to be arranged between cushion cap 4 and anchoring pile 11, to make datum line beam 1 level and not by the interference of other device; By datum line beam 1, dial gage 2 vertical rack is located on four angles of cushion cap cover plate 3.
S8, unlatching jack 5 pattern of pressure, because two row's anchoring piles 11 are pressed in foundation soil, reaction plate 15 is connected and fixed by wire rope 14, can provide enough counter-forces for device; Load is passed to cushion cap 4 and Model Pile 8 by cushion cap cover plate 3, for Model Pile 8 provides vertical load; Jack 5 utilizes load sensor 6 and numerical value dynamometer 19, realizes accurate hierarchical loading; Four dial gages 2 be fixed on datum line beam 1 can record cushion cap 4 sedimentation; In Model Pile 8, the two panels resistance strain gage 23 of different cross section can reflect the situation of pile strain in this degree of depth respectively, and program control statical strain indicator 17 can record pile strain, and can connection data process computer 18 record analysis pile strain data.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (10)
1. the model equipment of a clump of piles field trial, it is characterized in that, comprise anchoring pile, reaction plate, device for positioning and supporting, Model Pile, cushion cap, jack, load sensor, dial gage, program control statical strain indicator, data processing computer, numerical value dynamometer and resistance strain gage;
It is inner that described resistance strain gage is arranged on described Model Pile, and described Model Pile has many, and many Model Pile are fixed on below described cushion cap, and described cushion cap upper surface arranges cushion cap cover plate; Described jack is arranged between cushion cap cover plate and load sensor, and described load sensor is connected with described numerical value dynamometer; Described wire is connected with described program control statical strain indicator, and described program control statical strain indicator is connected with described data processing computer; Described dial gage is arranged on above cushion cap cover plate by datum line beam; Described anchoring pile is divided into two rows and is fixed in ground, is provided with support column between described reaction plate and ground;
Described device for positioning and supporting comprises upper frame, underframe and telescopic column, described upper frame is connected by column with underframe, the middle part of described upper frame and underframe is provided with junction plate, four angles of described junction plate arrange expansion link respectively, the end of described expansion link is provided with spacing collar, and described junction plate is provided with bubble.
2. the model equipment of clump of piles field trial according to claim 1, is characterized in that, described spacing collar comprises the circle body of two semicircles, and one end of two circle bodies is hinged, and the other end is connected by fastener.
3. the model equipment of clump of piles field trial according to claim 1, is characterized in that, described underframe is provided with cantilever, and described cantilever is placed on datum line beam.
4. the model equipment of clump of piles field trial according to claim 1, is characterized in that, the bottom of described underframe is provided with fixing feet.
5. the model equipment of clump of piles field trial according to claim 1, is characterized in that, described expansion link, upper frame and underframe are provided with rule.
6. the model equipment of clump of piles field trial according to claim 1, it is characterized in that, described reaction plate is connected by wire rope with anchoring pile, the fixed end of described wire rope is fixedly connected on described reaction plate by steel pipe, the movable end of described wire rope is passed by the wire rope fairlead on anchoring pile, and stretching by steel cable clamp fastening.
7. the model equipment of clump of piles field trial according to claim 1, is characterized in that, described Model Pile is connected with described cushion cap by nut, and described cushion cap is provided with multiple installing hole coordinated with Model Pile.
8. the model equipment of clump of piles field trial according to claim 1, is characterized in that, described cushion cap cover plate is provided with positioning boss, and described positioning boss contacts with the stress surface of jack.
9. the model equipment of clump of piles field trial according to claim 8, is characterized in that, the surface of described positioning boss is provided with groove.
10. utilize a test method for model equipment described in claim 1-9, it is characterized in that, comprise the following steps:
Anchoring pile is arranged in S1, location press-in two;
S2, reference for installation beam stationary positioned bracing or strutting arrangement, Model Pile is through spacing collar, many Model Pile of resistance strain gage are posted in press-in successively, by bubble leveling in the process of press-in, ensure the verticality of Model Pile and the uniformity of Ge Gen Model Pile stake heights of roofs; The column of positioning supports is scalable, guarantees the verticality of piling process model stake;
S3, Model Pile to be fixed on below cushion cap, and to place cushion cap cover plate at cushion cap upper surface;
S4, installation jack, connect load sensor, program control statical strain indicator, data processing computer, numerical value dynamometer;
S5, installation support column, be placed in reaction plate on datum line beam, be fixed on by steel pipe on reaction plate, connect anchoring pile and reaction plate with wire rope, and stretching with steel cable clamp fastening;
S6, dial gage are arranged on above cushion cap cover plate by datum line beam;
S7, utilize load sensor and numerical value dynamometer, realize the accurate hierarchical loading of jack, dial gage records cushion cap sedimentation, and program control statical strain indicator records pile strain, and data processing computer record analyzes strain data.
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| CN201510456473.7A CN105002939B (en) | 2015-07-29 | 2015-07-29 | Model device and method for grouped pile field test |
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| CN201510456473.7A CN105002939B (en) | 2015-07-29 | 2015-07-29 | Model device and method for grouped pile field test |
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| CN105821913A (en) * | 2016-04-06 | 2016-08-03 | 河南城建学院 | Reaction load applying device for foundation model test and testing method |
| CN105862941A (en) * | 2016-05-24 | 2016-08-17 | 武汉科技大学 | Model device and method for measuring time effect of bearing capacity of pile foundations on site |
| CN106088172A (en) * | 2016-08-11 | 2016-11-09 | 青岛理工大学 | A kind of simultaneous determination grout pile top and the assay device of pile end displacement |
| CN106284438A (en) * | 2016-08-11 | 2017-01-04 | 青岛理工大学 | A kind of simultaneous determination grout pile top and the test method of pile end displacement |
| CN106522291A (en) * | 2016-12-19 | 2017-03-22 | 武汉科技大学 | Field model test device and method for pulling resistance of pile cluster |
| CN110607811A (en) * | 2019-10-25 | 2019-12-24 | 中铁第四勘察设计院集团有限公司 | Pile group loading test device and method for simulating high-speed rail bridge operation load |
| CN113431104A (en) * | 2021-07-13 | 2021-09-24 | 中南大学 | Single-pile static load test device and method for providing counter force by combining pile group and bearing platform |
| CN114263222A (en) * | 2021-11-24 | 2022-04-01 | 浙江大学 | Model test device and method for measuring ultimate bearing capacity of grouped piles under inclined eccentric load in sandy soil |
| CN114755092A (en) * | 2022-03-23 | 2022-07-15 | 哈尔滨商业大学 | Special device and method for seasonal frozen soil indoor test |
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| CN105821913A (en) * | 2016-04-06 | 2016-08-03 | 河南城建学院 | Reaction load applying device for foundation model test and testing method |
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| CN105862941A (en) * | 2016-05-24 | 2016-08-17 | 武汉科技大学 | Model device and method for measuring time effect of bearing capacity of pile foundations on site |
| CN106088172A (en) * | 2016-08-11 | 2016-11-09 | 青岛理工大学 | A kind of simultaneous determination grout pile top and the assay device of pile end displacement |
| CN106284438A (en) * | 2016-08-11 | 2017-01-04 | 青岛理工大学 | A kind of simultaneous determination grout pile top and the test method of pile end displacement |
| CN106088172B (en) * | 2016-08-11 | 2019-04-02 | 青岛理工大学 | A kind of experimental rig of simultaneous determination bored concrete pile stake top and pile end displacement |
| CN106522291A (en) * | 2016-12-19 | 2017-03-22 | 武汉科技大学 | Field model test device and method for pulling resistance of pile cluster |
| CN106522291B (en) * | 2016-12-19 | 2018-07-10 | 武汉科技大学 | A kind of clump of piles resistance to plucking site-models experimental rig and method |
| CN110607811A (en) * | 2019-10-25 | 2019-12-24 | 中铁第四勘察设计院集团有限公司 | Pile group loading test device and method for simulating high-speed rail bridge operation load |
| CN113431104A (en) * | 2021-07-13 | 2021-09-24 | 中南大学 | Single-pile static load test device and method for providing counter force by combining pile group and bearing platform |
| CN114263222A (en) * | 2021-11-24 | 2022-04-01 | 浙江大学 | Model test device and method for measuring ultimate bearing capacity of grouped piles under inclined eccentric load in sandy soil |
| CN114755092A (en) * | 2022-03-23 | 2022-07-15 | 哈尔滨商业大学 | Special device and method for seasonal frozen soil indoor test |
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