CN105319123B - A kind of allpurpose model test pile - Google Patents

A kind of allpurpose model test pile Download PDF

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Publication number
CN105319123B
CN105319123B CN201510111479.0A CN201510111479A CN105319123B CN 105319123 B CN105319123 B CN 105319123B CN 201510111479 A CN201510111479 A CN 201510111479A CN 105319123 B CN105319123 B CN 105319123B
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China
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pile
pile body
stake
soil pressure
pressure cell
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Expired - Fee Related
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CN201510111479.0A
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Chinese (zh)
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CN105319123A (en
Inventor
肖昭然
毕景佩
张帅
张雪
朱亮亮
曹明明
赵宪强
吕清显
郑华茂
周志强
蒋敏敏
郭祝辉
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Henan University of Technology
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Henan University of Technology
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Abstract

The invention discloses a kind of allpurpose model test piles, the Model Pile includes stake top, pile body, tension fixed ring, draw ring, miniature soil pressure cell, pile top, stake top has half flexural pivot and walks wire connections, it connect with pile body, multiple grooves are installed on pile body, the miniature soil pressure cell of installation in groove, tension Fixing shrink ring is in pile body and can fix, draw ring is mounted on tension fixed ring side, vertical force sensor is installed inside the pile body other end, force snesor is connected by power transmission lever with pile top, sponge ring is arranged in the gap of pile top and pile body, the measure traverse line of miniature soil pressure cell and force snesor is exported inside pile body by walking the circular hole of wire connections.The Model Pile can measure soil pressure against piles and end resistance of the stake in native bed, the problem of overcoming disturbance of the ordinary test measurement method to stake soil former stress field, and vertical load experiment, horizontal loading test and the pullout tests of Model Pile can be carried out, the high, feature applied widely, simple to operation with accuracy.

Description

A kind of allpurpose model test pile
Technical field
The invention patent relates to technical field of civil engineering, more particularly to a kind of allpurpose model test pile.
Background technology
With extensive use of the pile foundation in building structure, increasingly seem to the research of pile foundation bearing mechanism at present It is important.Scale (model) test for the research of the bearing mechanism of pile foundation is essential with live full scale test.Live full size Experiment has certain advantage due to considering actual field environmental condition, but its experimentation cost is too high and experimental condition not It is easy to control;But model investigation has many advantages, such as, can such as provide controlled experimental enviroment, in addition can carry out in more economical way The research of different tests parameter.So the indoor scale (model) test research to stake correlation properties becomes research pile foundation bearing characters One of important method, increasingly by the attention of scholars.
In pile foundation room in scale (model) test, the preparation of model experiment stake and soil around pile pressure measurement are extremely important Link.Pile foundation test is broadly divided into vertical load experiment, horizontal loading test and pullout tests, conventional test methods for this three Kind experiment makes model experiment stake respectively, to make workload increase.In addition model experiment stake tradition method for measuring stress is usual It is the foil gauge measuring strain being sticked using pile body, pile body lateral stress, moment of flexure and pile top is then extrapolated by pile strain and hindered Power etc. has that model experiment stake makes complicated, projectional technique matching error and data processing error;Also have plenty of in mould Stress measurement device, such as miniature soil pressure cell are laid in type experiment stake surrounding soil, but the method arrangement measuring device is cumbersome And the stress field of pile peripheral earth can be disturbed and do not conformed to the actual conditions to make to measure result.Usually used model experiment stake and its pile body Stress measurement device makes and installation process is complicated, is easy to generate disturbance to former stress field, to reduce the reliable of acquisition data Property.In addition when simulation stake is tested by vertical load, horizontal loading, need corresponding model experiment stake, operation multiple Miscellaneous and consuming is larger.
Invention content
The purpose of patent of the present invention be in order to the stress method for measurement for existing model experiment stake is complicated and with really answer The problems such as power is not inconsistent provides a kind of allpurpose model test pile that can be used in multiple loading type model tests, this Model experiment stake can not only measure the pile body lateral stress at end-resistance and pile body different location, compared to traditional measurement mode Speech disturbs very little, data measured more closing to reality to stake circumferential stress field, and can carry out vertical load experiment, horizontal loading examination It tests and pullout tests, reduces test work load and improve experiment convenience.
Technical solution is used by patent of the present invention:
A kind of allpurpose model test pile, the model experiment stake include half flexural pivot, walk wire connections, pile body, tension and fix Ring, draw ring, miniature soil pressure cell, vertical force sensor, power transmission lever, fixed plate, pile top, measure traverse line, sponge ring, half flexural pivot It is connect with wire connections are walked, the other end for walking wire connections is connect with pile body, and groove is installed on pile body, and installation is miniature in groove Soil pressure cell, tension Fixing shrink ring is in pile body upper position and can have bolt to fix, and draw ring is mounted on tension fixed ring side, stake Vertical force sensor is installed inside the body other end, force snesor uses the power transmission lever across fixed plate circular hole to be connected with pile top, Sponge ring is arranged in the gap of pile top and pile body, the measure traverse line of miniature soil pressure cell and vertical force sensor by pile body inside Circular hole by walking wire connections exports.
Further, a kind of allpurpose model test pile, including stake top, pile body, pile top, miniature soil pressure cell, vertical force Sensor, the miniature soil pressure cell are embedded in pile body surrounding, and the vertical force sensor is placed in inside pile top, and pile top is located at mould Type test pile end;The stake top includes half flexural pivot, walks wire connections, tension fixed ring;There is hemisphere in half flexural pivot one end, another Hold and walk wire connections and be threadedly coupled, walk wire connections side wall be useful for measure traverse line by circular hole, one end is equipped with threaded hole To be hinged with hemisphere, the other end is connect equipped with screw thread with pile body;Tension Fixing shrink ring, can be through being bolted on pile body In any position;The pile body surrounding is provided with embedded hole, and it is smaller 1mm than stake internal diameter to embed hole depth;The miniature soil pressure cell It is placed in pile body to embed in hole, measure traverse line is pierced into out of on the inside of embedded hole pile lining aperture inside pile body;Vertical force sensor is located at Inside pile top, pile top is connect by power transmission lever across fixed plate center hole with force snesor;It stays and is set greatly between pile top and pile body In the gaps 2mm, and sponge ring is laid in gap;Pile body embeds bore dia and is more than miniature soil pressure cell diameter 1mm, in gap Fill transparent epoxy base resin;Pile top detachably replaces with the pile top of different angle.
Compared with prior art, the advantageous effect of patent of the present invention is:
1. embedding miniature soil pressure cell amount at pile body different location to measure soil lateral pressure, laid inside pile top Vertical force sensor is to measure end-resistance, and measure traverse line is walked out via inside pile body from stake top position, it is ensured that is not disturbing Pile body soil lateral pressure is measured under the premise of dynamic original pile-soil stress field and end-resistance, the model experiment stake make up conventional method Deficiency more can intuitively measure pile body soil lateral pressure distribution situation, to analyze the bearing mechanism and mechanical property of pile foundation Strong support is provided.
2. it is simple in structure, it is easily installed and dismantles, vertical load, horizontal loading and pullout tests can be carried out.The present invention is special Profit is made of 11 components, simple in structure, installation easy to process.Meanwhile it half flexural pivot, walking between wire connections, pile body, pile top It is easy for removal and installation using thread connecting mode.When carrying out the experiment of piles with different wedge angle degree, replaceable pile top component, and Other component may continue to use.When carrying out pile top pullout tests, half flexural pivot can be removed, replace with draw ring, to convenient Carry out pullout tests.Tension Fixing shrink ring moves up and down and can be bolted on any position in pile body, can carry out not With the horizontal tension loading test of model experiment stake at height pile body position.
3. high certainty of measurement, test data is reliable.The load when flexural pivot of model experiment stake topmost installation can reduce piling Influence of the bias to model experiment stake.Miniature soil pressure cell is embedded in model experiment pile body surrounding and stays in the groove set, groove from Model experiment stake is distributed from top to bottom, and groove diameter is more than miniature soil pressure cell diameter, then uses transparent epoxy base resin will Gap filling, it is affected to eliminate miniature soil pressure cell lateral force institute, improves the accurate of miniature soil pressure cell measurement data Property.Sponge ring is laid in pile top and between pile body stays the gap set, can not only prevent the soil body from entering in gap, but without limitation on power The vertical displacement of the connected pile top of transmission lever, to can guarantee the accuracy of vertical force sensor measurement.
Description of the drawings
Fig. 1 is the structural schematic diagram of patent of the present invention;
Fig. 2 is the cross-sectional view of the structure of patent of the present invention;
Fig. 3 is the pile body sectional view of patent of the present invention;
Fig. 4 is the stake top cross-sectional view of the structure of patent of the present invention;
Fig. 5 is one of the pile top cross-sectional view of the structure of patent of the present invention;
Fig. 6 is the spherical hinge structure schematic diagram of patent of the present invention;
Fig. 7 is the cabling connecting-piece structure schematic diagram of patent of the present invention;
Fig. 8 is the tension fixed ring sectional view of patent of the present invention;
Fig. 9 is the two of the pile top cross-sectional view of the structure of patent of the present invention.
In figure:1 is half flexural pivot, and 2 be to walk wire connections, and 3 be pile body, and 4 be tension fixed ring, and 5 be draw ring, and 6 be miniature soil Pressure cell, 7 be vertical force sensor, and 8 be power transmission lever, and 9 be fixed plate, and 10 be pile top, and 11 be sponge ring, and 12 lead to measure Line, 101 be hemisphere.
Specific implementation mode
Patent of the present invention is further illustrated below in conjunction with the accompanying drawings.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, patent of the present invention passes through in pile body difference position Embedded miniature soil pressure cell 6 is set to measure soil pressure against piles, and uses vertical force sensor 7 inside the pile body being connected with pile top 10 To measure end-resistance.The 6 a diameter of 10mm of miniature soil pressure cell selected, thickness 5mm, the reserved embedded hole of pile body is 11mm, edge Pile body vertical direction is uniformly distributed, and each sectional uniform is distributed four miniature soil pressure cells 6, miniature soil pressure cell 6 and embedded hole Between gap use transparent epoxy base resin fill.Tension fixed ring 4 can be removed or be installed according to test requirements document, also can be in stake Simultaneously bolt is fixed for adjustment position with it.
There are screw thread, 10 one end of pile top to be installed with matched screw thread mouth and be connected with power transmission lever 8 in power transmission lever 8, the two connects There are the gaps of 3mm after connecing, and are laid with sponge ring 11 in gap to prevent soil particle from entering pile body gap;Model experiment stake The pile top 10 of replaceable different angle, such as 30 °, 45 °, 60 ° of pile top, so as to carry out the model experiment of different angle pile top Stake experiment.
Walking one end on wire connections 2 has screw thread mouth, the other end to have screw thread, half flexural pivot, 1 one end to be threaded and can be with cabling The screw thread mouth of connector 2 connects, and walks wire connections 2 and is connect with tapped pile body 3.Walk 2 both sides of wire connections symmetrically there are The measure traverse line 12 of the circular hole of diameter 10mm, miniature soil pressure cell 6 and vertical force sensor inside pile body from circular hole by walking out.
When carrying out vertical load experiment, model experiment stake is placed on native bed, is made by laboratory's vertical loading device With on the hemisphere 101 of half flexural pivot 1 of stake top, model experiment stake is pressed into native bed, it is vertically quiet then to carry out model experiment stake Carry experiment.Half flexural pivot 1 can prevent from applying the Influence from Eccentric of vertical load.
When carrying out horizontal loading test, draw ring 5 is mounted in tension fixed ring 4, then by tension Fixing shrink ring in stake It is on body and fixed, it is connect with draw ring 5 by the steel strand wires of horizontal loading apparatus and carries out horizontal loading test.
When carrying out pullout tests, half flexural pivot 1 is removed and replaces with draw ring, is then connect with draw ring using vertical loading device Carry out pullout tests.

Claims (1)

1. a kind of allpurpose model test pile, it is characterised in that:It includes stake top, pile body, pile top, miniature soil pressure cell, vertical Force snesor, the miniature soil pressure cell(6)It is embedded in pile body(3)Surrounding, the vertical force sensor(7)It is placed in pile top Portion, pile top(10)Positioned at model test stake end;The stake top includes half flexural pivot(1), walk wire connections(2), tension fixed ring (4);Half flexural pivot(1)There is hemisphere in one end(101), the other end and walk wire connections(2)It is threadedly coupled, walks wire connections(2)Side Wall is useful for measure traverse line(12)By circular hole, one end be equipped with threaded hole to half flexural pivot(1)Connection, the other end are equipped with spiral shell Line and pile body(3)Connection;Tension fixed ring(4)It is sleeved on pile body, any position can be fixed on via bolt;The pile body(3) Surrounding is provided with embedded hole, and it is smaller 1mm than stake internal diameter to embed hole depth;The miniature soil pressure cell(6)It is placed in pile body(3)Embedded hole In, measure traverse line(12)On the inside of from embedded hole pile body is pierced into pile lining aperture(3)It is internal;Vertical force sensor(7)Positioned at pile top Inside, power transmission lever(8)Across fixed plate(9)Pile top is connect by center hole with force snesor;Pile top(10)With pile body(3)It Between stay and set more than the gaps 2mm, and sponge ring is laid in gap(11);Pile body(3)Embedded bore dia is more than miniature soil pressure cell (6)Diameter 1mm fills transparent epoxy base resin in gap;Pile top(10)The detachable pile top for replacing with different angle.
CN201510111479.0A 2015-03-16 2015-03-16 A kind of allpurpose model test pile Expired - Fee Related CN105319123B (en)

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Publication number Priority date Publication date Assignee Title
CN105628512A (en) * 2016-03-23 2016-06-01 四川大学 Test box and system capable of simulating mechanical property of test piece under freeze-thaw temperature load
CN106052916B (en) * 2016-08-08 2022-06-24 石家庄铁道大学 Soil pressure box burying device and method for filling engineering
CN107761786B (en) * 2017-10-16 2019-11-12 浙江煤炭测绘院有限公司 A kind of mounting process for deep embeded type soil pressure cell
CN107989080B (en) * 2018-01-04 2023-08-22 宁波宁大工程建设监理有限公司 Assembled rectangular model pile and manufacturing method thereof
CN111021439A (en) * 2020-01-20 2020-04-17 福州大学 Embedding device suitable for miniature soil pressure box of model pile and manufacturing method thereof
CN111710226A (en) * 2020-06-12 2020-09-25 安徽省(水利部淮河水利委员会)水利科学研究院(安徽省水利工程质量检测中心站) Multi-working-condition simulation combination device for low-strain detection of foundation pile

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CN1246568A (en) * 1998-09-01 2000-03-08 朱传浦 Temporarily prestressed concrete tubular pile
CN102589756A (en) * 2012-03-27 2012-07-18 北京工业大学 Device used in rock and soil test for improving testing accuracy of micro earth pressure cell
CN204781019U (en) * 2015-03-12 2015-11-18 河南工业大学 Multi -functional model test stake

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Inventor after: Xiao Zhaoran

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