CN106522291A - Field model test device and method for pulling resistance of pile cluster - Google Patents

Field model test device and method for pulling resistance of pile cluster Download PDF

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Publication number
CN106522291A
CN106522291A CN201611179416.XA CN201611179416A CN106522291A CN 106522291 A CN106522291 A CN 106522291A CN 201611179416 A CN201611179416 A CN 201611179416A CN 106522291 A CN106522291 A CN 106522291A
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China
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frustum
pile
cushion cap
standard
model
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CN201611179416.XA
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Chinese (zh)
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CN106522291B (en
Inventor
汤斌
费建武
周亚杰
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Wuhan University of Science and Engineering WUSE
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Wuhan University of Science and Engineering WUSE
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Priority to CN201611179416.XA priority Critical patent/CN106522291B/en
Publication of CN106522291A publication Critical patent/CN106522291A/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00Testing foundations or foundation structures

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

The invention relates to a field model test device and method for the pulling resistance of a pile cluster. The field model test device comprises a plurality of model piles, a main beam, a standard pile, a standard beam, a dial indicator and a counterforce pier, wherein the standard beam is mounted on the standard pile, the dial indicator used for measuring settlement of the model piles is mounted on the standard beam, the main beam is mounted on the counterforce pier, a centre hole jack is arranged on the main beam, and the multiple model piles are fixed to a bearing stand to form the pile cluster; and limiting holes are formed in the bearing stand, the upper ends of the model piles penetrate through the limiting holes and fixed to the bearing stand through first nuts, and a box cover is fixed to the top of the bearing stand. According to the field model test device and method for the pulling resistance of the pile cluster, the perpendicularity of a foundation of the pile cluster and the levelness of a foundation of the bearing stand can be guaranteed, and uniform stress of the foundation of the pile cluster is guaranteed; in the pile driving process, the model piles can be made internally tangent to the limiting holes, and thus the perpendicularity of the model piles is guaranteed.

Description

A kind of clump of piles resistance to plucking site-models assay device and method
Technical field
The present invention relates to ground work engineering field, more particularly, it relates to a kind of clump of piles resistance to plucking site-models assay device.
Background technology
Pile foundation is a kind of modal base form, is all obtained in building, bridge, tunnel, harbour and structures field Extensive utilization, pile foundation are applied to super high rise building, large-scale bridges by substantial amounts of with its exclusive bearing capacity advantage Beam etc. modernizes civil engineering, and pile foundation possesses powerful application prospect.
In pile foundation engineering, the prototype test for carrying out pile foundation needs to spend substantial amounts of human and material resources and financial resources, or due to The restriction of field condition causes pile foundation prototype test be smoothed out, under these conditions, site-models test become research, Explore and solve one of effective way of engineering problem.
In existing clump of piles resistance to plucking site-models process of the test, there is provided the jack of withdrawal resistance cannot ensure absolute synchronization Pressurization, causes impact of the eccentric force that cushion cap foundation more or less bears to result of the test;Traditional many dowel steels cannot ensure The phenomenon of many bar uniform forces, so as to cause cushion cap foundation discontinuity;The purposes of traditional resistance to plucking site-models assay device With respect to single, it is impossible to realize multipurpose, efficient test.
The content of the invention
The technical problem to be solved in the present invention is, there is provided a kind of clump of piles resistance to plucking site-models assay device and method, can To ensure the levelness and multi-column pier foundation uniform stressed of the perpendicularity and cushion cap foundation of multi-column pier foundation.
The technical solution adopted for the present invention to solve the technical problems is:Construct a kind of clump of piles resistance to plucking site-models test dress Put, including Model Pile, girder, standard pile, Standard Beam and counter-force pier, the Standard Beam, the standard are installed on the standard pile Dial gauge for measurement model stake sedimentation is installed on beam, the erection of main beam is on counter-force pier, it is characterised in that the girder On be provided with centre-hole jack, the Model Pile is provided with many, and many Model Piles are fixed on cushion cap, constitute a clump of piles, it is described Cushion cap is provided with spacing hole, and Model Pile upper end is passed through spacing hole and is fixed on cushion cap by the first nut, the top of the cushion cap Portion is fixed with case lid, and the case lid crown center position is provided with arc shaped hook, and the arc shaped hook is fixed on case lid by the second nut On, the arc shaped hook is connected with cable wire, and frustum and frustum cap are provided with the top of the centre-hole jack, and the cable wire passes through described Frustum and frustum cap, are provided with the frustum plug to being clipped in cable wire both sides inside the frustum, the frustum cap is threadedly coupled with frustum, The frustum cap of tightening makes frustum plug clamp cable wire, and the Model Pile inwall is fixed with foil gauge, and the wire for connecting foil gauge leads to Cross wire hole and be connected to program control statical strain indicator through Model Pile, the outer surface of the cushion cap is provided with inserted sheet, the dial gauge with The blade contact.
In such scheme, the steel plate rib for being mutually perpendicular to be distributed inside the cushion cap, is provided with.
In such scheme, the cushion cap is connected by plate with case lid, and the cushion cap and the plate are provided with corresponding Threading groove, in residing plate insertion threading groove.
In such scheme, the cushion cap surface is provided with level indicator.
Present invention also offers a kind of test method of clump of piles resistance to plucking site-models assay device, comprises the following steps:
S1, one group of foil gauge is symmetrically fixed at a certain distance in Model Pile inwall, the wire for connecting foil gauge passes through String holes is connected to program control statical strain indicator through Model Pile;
S2, single Model Pile is sequentially passed through spacing hole and the first nut in cushion cap position to place, and squeeze into Model Pile To specified location, plug is installed in Model Pile lower end, successively using identical method squeeze into Model Pile and will Model Pile and inserted sheet it is solid Determine on cushion cap;
S3, case lid and cushion cap are connected as by an entirety by plate, case lid is just gone up part and installs arc shaped hook, and arc shaped hook leads to Cross the second nut to fix;
S4, standard pile is squeezed into, and Standard Beam is installed on standard pile, dial gauge is installed on Standard Beam;Connecting with standard pile Counter-force pier is placed on the vertical line of line center, girder on counter-force pier, is set up, centre-hole jack, jack are placed in girder centre position Upper erection frustum;During test, in the frustum set up on centre-hole jack frustum plug through top frustum cap to frustum plug Extruding realizes that frustum plug is contacted with the extruding of cable wire, when centre-hole jack pushing tow frustum upwards, frustum plug and steel in frustum There is a relative motion trend between rope, frustum plug band running wire occurs a displacement upwards, so as to cause the product of uplift force Raw, uplift force passes to cushion cap by cable wire and case lid, above stands head and shoulders above others a model;
S5, by dial gauge read displacement at pile top, by program control statical strain indicator read Model Pile dependent variable.
In such scheme, when needing to do anti-horizontal loading site-models experimental study, only girder and its top need to be filled Put and be all moved to outside of the standard pile relative to multi-column pier foundation, and be rotated by 90 ° laterally to be laid in and same water be in cushion cap Steel plate in plane, the Standard Beam for removing is attached on counter-force pier, and pressurize centre-hole jack, completes multi-column pier foundation Anti- horizontal loading test.
Implement the clump of piles resistance to plucking site-models assay device and method of the present invention, have the advantages that:
1st, the device can ensure that the levelness and multi-column pier foundation uniform stressed of the perpendicularity and cushion cap foundation of multi-column pier foundation, I.e. in cushion cap spacing hole by be mutually perpendicular to or parallel vertical rectangular slab between space constitute, be mutually perpendicular to or parallel vertical Between rectangular slab, welding fabrication is cushion cap, and the design that there are a large amount of steel plate ribs in cushion cap ensure that the needs of Pile-cap Rigidity, so as to The overall stress of cushion cap and Model Pile, i.e. multi-column pier foundation uniform stressed are ensure that, because spacing hole possesses vertical condition in itself, Model Pile can be made during piling to be inscribed within spacing hole, so as to ensure that the perpendicularity of Model Pile;
2nd, be respectively arranged with two intersecting lateral faces of cushion cap two it is in the same plane mutually not parallel and hang down with Model Pile Straight level indicator, whether in two level indicators placed in the middle, air level determines a horizontal plane, occupied according to two air levels in test Middle judgement cushion cap whether level;
3rd, the device can ensure that uplift force is uniformly transferred, i.e. the design of cable wire many bar power transmissions different from the past, be changed to list Root cable wire (being made up of A, B two parts) doubling stress, without fixed constraint and arc shaped hook between in the middle part of cable wire, during test, single steel Rope A, part B absolute synchronization stress, uniformly transfer uplift force.
Description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the front view of clump of piles resistance to plucking site-models assay device of the present invention;
Fig. 2 is the side view of clump of piles resistance to plucking site-models assay device of the present invention;
Fig. 3 is the site plan of clump of piles resistance to plucking site-models assay device of the present invention;
Fig. 4 is the counter-force pier structure schematic diagram of clump of piles resistance to plucking site-models assay device of the present invention;
Fig. 5 is the frustum profile of clump of piles resistance to plucking site-models assay device of the present invention;
Fig. 6 is the cushion cap and cover structure schematic diagram of clump of piles resistance to plucking site-models assay device of the present invention;
Fig. 7 is the flat bearer plane layout drawing of water resistant of clump of piles resistance to plucking site-models assay device of the present invention.
Specific embodiment
In order to be more clearly understood to the technical characteristic of the present invention, purpose and effect, now compare accompanying drawing and describe in detail The specific embodiment of the present invention.
As shown in Fig. 1 to 7, clump of piles resistance to plucking site-models assay device of the present invention includes:Model Pile 1, foil gauge 2, outlet Hole 3, the first nut 4, inserted sheet 5, standard pile 6, Standard Beam 7, dial gauge 8, cushion cap 9, spacing hole 91, steel plate rib 92, level indicator 93, Case lid 10, the second nut 11, arc shaped hook 12, plate 13, threading groove 131, threading groove 132, cable wire 14, centre-hole jack 15, Frustum 16, screw thread 161, frustum plug 162, frustum cap 17, girder 18, counter-force pier 19.
Standard Beam 7 is installed on standard pile 6, the dial gauge 8 for the sedimentation of measurement model stake 11, girder are installed on Standard Beam 7 18 are arranged on counter-force pier 19, and centre-hole jack 15 is provided with girder 18, and Model Pile 1 is provided with many, and many Model Piles 1 are solid It is scheduled on cushion cap 9, constitutes a clump of piles, cushion cap 9 is provided with spacing hole 91, and 1 upper end of Model Pile passes through spacing hole 91 and passes through the first spiral shell Female 4 are fixed on cushion cap 9, and the top of cushion cap 9 is fixed with case lid 10, and 10 crown center position of case lid is provided with arc shaped hook 12, arc Hook 12 is fixed on case lid 10 by the second nut 11, and arc shaped hook 12 is connected with cable wire 14, is provided with the top of centre-hole jack 15 Frustum 16 and frustum cap 17, cable wire 14 pass through frustum 16 and frustum cap 17, are provided with to being clipped in 14 both sides of cable wire inside frustum 16 Frustum plug 162, frustum cap 17 are connected by screw thread 161 with frustum 16, and tightening frustum cap makes frustum plug 162 clamp cable wire 14, mould 1 inwall of type stake is fixed with foil gauge 2, and the wire for connecting foil gauge 2 is connected to program control static state through Model Pile 1 by wire hole 3 Deformeter, the outer surface of cushion cap 9 are provided with inserted sheet 5, and the measurement head of dial gauge 8 is contacted with 5 surface of inserted sheet, and the displacement of inserted sheet 5 is The displacement of a clump of piles.
1 upper end of Model Pile is fixed on cushion cap 9 through spacing hole 91 by the first nut 4, the spacing hole of certain depth The perpendicularity of 91 Model Piles 1 for ensureing, the level indicator 93 of 9 side of cushion cap ensure that the levelness of cushion cap 9, and 9 top of cushion cap is worn The bottom threading groove 132 of board slot 131 and case lid 10 is fixed on same level by the dislocation of plate 13, and that what is born on case lid 10 is upper Pull out force passes to cushion cap 9 by plate at its tank wall, and in cushion cap 9, steel plate rib 92 ensures that cushion cap 9 possesses making and cushion cap for abundance The rigidity of the 1 synchronous stress of Model Pile of connection.
The bottom of case lid 10 is connected with cushion cap 9 by plate 13, and case lid crown center position arc shaped hook 12 passes through nut 11 Be connected with case lid 10, arc shaped hook 12 bear the effect of square steel rope 14 thereon on pull out tension force, and this uplift force is passed through into the second nut 11 pass to case lid 10.
Such as Fig. 6, in order to avoid plate 13 occurs failure by shear, its cross-sectional area should meet following condition:
In formula, cross-sectional areas of the S for plate;
Thickness of the h for plate, width of the L for plate;
The allowable shear stress of [τ] plate, equal to 0.6-0.8 τDraw, τDrawFor the tensile strength of steel;
FmaxFor maximum withdrawal resistance.
Frustum plug 162 is caused to produce a displacement straight down by the frustum cap 17 that screw thread 161 is manually tightened, due to The effect of 162 conical surface of frustum plug, frustum plug 162 generate level to the water in 14 direction of cable wire while producing displacement straight down Prosposition is moved, so as to cause lateral extrusion of the frustum plug 162 to cable wire 14, when the effect of centre-hole jack 15 drives frustum 16 When frustum plug 162 produces a displacement trend straight up, the uplift force of centre-hole jack is passed in the form of stiction Pass cable wire.
The middle part of girder 18 is equally open at the lower ending opening relative to centre-hole jack 15, and opening diameter is consistent, The pushing tow frustum 16 upwards based in the middle part of girder 18 of centre-hole jack 15, the two ends of girder 18 based on counter-force pier 19, Balance power of the centre-hole jack 15 to girder 18.
The structural representation of counter-force pier 19 such as Fig. 4, arranges symmetrical rib of slab inside counter-force pier 19, to provide counter-force pier 19 Rigidity, the expansion downwards of 19 numerical value of counter-force pier are processed, to the bearing capacity for improving counter-force pier 19, while counter-force pier pair can be reduced The impact of Model Pile soil pressure.
The detailed enforcement measuring method step of above-mentioned assay device is as follows:
1. one group of foil gauge is symmetrically fixed at a certain distance in Model Pile inwall, the wire for connecting foil gauge passes through outlet Hole is connected to program control statical strain indicator through Model Pile.
2. handle test site well, single Model Pile is sequentially passed through into spacing hole and nut in cushion cap and positions to place certain Point, and Model Pile is squeezed into specified location, plug is installed in Model Pile lower end, it is to avoid in place, clay enters mould during piling Inside type stake, experimental results are affected.Model Pile is squeezed into using identical method successively and Model Pile and inserted sheet are fixed to Relevant position on cushion cap.
3. case lid and cushion cap are connected as by an entirety by plate, case lid is just gone up part and installs the arc for being available for cable wire to connect Shape hook, arc shaped hook are fixed by nut.Such as Fig. 6.
4. compare drawing standard pile to be squeezed into relevant position and Standard Beam is installed on standard pile, percentage is installed on Standard Beam Table, dial gauge are used to measure multi-column pier foundation sedimentation;With standard pile line center vertical line on place counter-force pier, counter-force pier restocking If girder, centre-hole jack is placed in girder centre position, and frustum is set up on jack.During test, on centre-hole jack Extruding of the frustum plug through top frustum cap to frustum plug in the frustum of erection realizes that frustum plug is contacted with the extruding of cable wire, when wearing Core type jack upwards pushing tow frustum when, in frustum between frustum plug and cable wire occur a relative motion trend, frustum plug band There is a displacement upwards in running wire, so as to cause the generation of uplift force, uplift force to pass to cushion cap by cable wire and case lid.
5. when needing to do anti-horizontal loading site-models experimental study, only need to girder and its upper unit all movements To standard pile relative to the outside of multi-column pier foundation, and the steel being laid in cushion cap in the same level is rotated by 90 ° laterally Plate, the Standard Beam for removing is attached on counter-force pier, and pressurize centre-hole jack, completes the anti-horizontal loading of multi-column pier foundation Test.
Displacement at pile top is read by dial gauge, the dependent variable of Model Pile is read by program control statical strain indicator, jack Loading force directly can be read on jack.
Embodiments of the invention are described above in conjunction with accompanying drawing, but be the invention is not limited in above-mentioned concrete Embodiment, above-mentioned specific embodiment are only schematic, rather than restricted, one of ordinary skill in the art Under the enlightenment of the present invention, in the case of without departing from present inventive concept and scope of the claimed protection, can also make a lot Form, these are belonged within the protection of the present invention.

Claims (6)

1. a kind of clump of piles resistance to plucking site-models assay device, including Model Pile, girder, standard pile, Standard Beam, Standard Beam and counter-force Pier, installs the Standard Beam on the standard pile, Standard Beam is installed on the Standard Beam, is used for measurement model on the Standard Beam The dial gauge of stake sedimentation, the erection of main beam is on counter-force pier, it is characterised in that be provided with punching on the girder very heavy Top, the Model Pile are provided with many, and many Model Piles are fixed on cushion cap, constitute a clump of piles, and the cushion cap is provided with spacing hole, mould Type stake upper end is passed through spacing hole and is fixed on cushion cap by the first nut, and case lid, the case are fixed with the top of the cushion cap Tops centre position is provided with arc shaped hook, and the arc shaped hook is fixed on case lid by the second nut, the arc shaped hook and cable wire Connection, is provided with frustum and frustum cap at the top of the centre-hole jack, the cable wire passes through the frustum and frustum cap, the cone The frustum plug to being clipped in cable wire both sides is provided with inside platform, the frustum cap is threadedly coupled with frustum, the frustum cap of tightening makes cone Platform plug clamps cable wire, and the Model Pile inwall is fixed with foil gauge, and the wire for connecting foil gauge passes through Model Pile by wire hole Program control statical strain indicator is connected to, the outer surface of the cushion cap is provided with inserted sheet, the dial gauge and the blade contact.
2. clump of piles resistance to plucking site-models assay device according to claim 1, it is characterised in that be provided with inside the cushion cap It is mutually perpendicular to the steel plate rib being distributed.
3. clump of piles resistance to plucking site-models assay device according to claim 1, it is characterised in that the cushion cap is led to case lid Plate connection is crossed, the cushion cap and the plate are provided with corresponding threading groove, in residing plate insertion threading groove.
4. clump of piles resistance to plucking site-models assay device according to claim 1, it is characterised in that the cushion cap surface is provided with Level indicator.
5. a kind of test method of the clump of piles resistance to plucking site-models assay device described in utilization claim 1, it is characterised in that bag Include following steps:
S1, one group of foil gauge is symmetrically fixed at a certain distance in Model Pile inwall, the wire for connecting foil gauge passes through wire hole Program control statical strain indicator is connected to through Model Pile;
S2, single Model Pile is sequentially passed through spacing hole and the first nut in cushion cap position to place, and squeeze into Model Pile and extremely refer to Positioning is put, and plug is installed in Model Pile lower end, squeezes into Model Pile using identical method successively and is fixed to Model Pile and inserted sheet On cushion cap;
S3, case lid and cushion cap are connected as by an entirety by plate, case lid is just gone up part and installs arc shaped hook, arc shaped hook is by the Two nuts are fixed;
S4, standard pile is squeezed into, and Standard Beam is installed on standard pile, dial gauge is installed on Standard Beam;In with standard pile line Counter-force pier is placed on heart vertical line, girder on counter-force pier, is set up, centre-hole jack, jack restocking are placed in girder centre position If frustum;During test, extruding of the frustum plug through top frustum cap to frustum plug in the frustum set up on centre-hole jack Realize that frustum plug is contacted with the extruding of cable wire, when centre-hole jack pushing tow frustum upwards, in frustum frustum plug and cable wire it Between occur a relative motion trend, frustum plug band running wire there is a displacement upwards, so as to cause the generation of uplift force, on Pull out force passes to cushion cap by cable wire and case lid, above stands head and shoulders above others a model;
S5, by dial gauge read displacement at pile top, by program control statical strain indicator read Model Pile dependent variable.
6. the test method of clump of piles resistance to plucking site-models assay device according to claim 5, it is characterised in that work as needs When doing anti-horizontal loading site-models experimental study, only girder and its upper unit all need to be moved to standard pile relative to group The outside of pile foundation, and the steel plate being laid in cushion cap in same level is rotated by 90 ° laterally, by what is removed Standard Beam is attached on counter-force pier, and pressurize centre-hole jack, completes the anti-horizontal loading test of multi-column pier foundation.
CN201611179416.XA 2016-12-19 2016-12-19 A kind of clump of piles resistance to plucking site-models experimental rig and method Expired - Fee Related CN106522291B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110849790A (en) * 2019-11-25 2020-02-28 浙江大学 Constant water head static load pile bearing type roadbed seepage erosion test device
CN116624454A (en) * 2023-06-07 2023-08-22 兰州交通大学 Adjustable modular model pile inner wall strain gauge pasting device and use method

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CN201520988U (en) * 2009-10-10 2010-07-07 中交上海港湾工程设计研究院有限公司 Physical pile group vertical uplift-resisting static load testing system
CN201687015U (en) * 2010-02-25 2010-12-29 中国电力科学研究院 Pulling resistance testing device
JP2014088689A (en) * 2012-10-30 2014-05-15 Ssc Pile Association Loading test method and loading test device for composite reinforcement ground
CN105002939A (en) * 2015-07-29 2015-10-28 武汉科技大学 Model device and method for grouped pile field test
CN206538798U (en) * 2016-12-19 2017-10-03 武汉科技大学 A kind of clump of piles resistance to plucking site-models experimental rig

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020095976A1 (en) * 1999-11-12 2002-07-25 Reinert Gary L. Pile testing reaction anchor apparatus and method
CN201520988U (en) * 2009-10-10 2010-07-07 中交上海港湾工程设计研究院有限公司 Physical pile group vertical uplift-resisting static load testing system
CN201687015U (en) * 2010-02-25 2010-12-29 中国电力科学研究院 Pulling resistance testing device
JP2014088689A (en) * 2012-10-30 2014-05-15 Ssc Pile Association Loading test method and loading test device for composite reinforcement ground
CN105002939A (en) * 2015-07-29 2015-10-28 武汉科技大学 Model device and method for grouped pile field test
CN206538798U (en) * 2016-12-19 2017-10-03 武汉科技大学 A kind of clump of piles resistance to plucking site-models experimental rig

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110849790A (en) * 2019-11-25 2020-02-28 浙江大学 Constant water head static load pile bearing type roadbed seepage erosion test device
CN116624454A (en) * 2023-06-07 2023-08-22 兰州交通大学 Adjustable modular model pile inner wall strain gauge pasting device and use method
CN116624454B (en) * 2023-06-07 2023-10-10 兰州交通大学 Adjustable modular model pile inner wall strain gauge pasting device and use method

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Granted publication date: 20180710