CN106702998B - A kind of high-precision micro flat dilatometer - Google Patents
A kind of high-precision micro flat dilatometer Download PDFInfo
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- CN106702998B CN106702998B CN201611039037.0A CN201611039037A CN106702998B CN 106702998 B CN106702998 B CN 106702998B CN 201611039037 A CN201611039037 A CN 201611039037A CN 106702998 B CN106702998 B CN 106702998B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Soil Sciences (AREA)
- Analytical Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a kind of high-precision micro flat dilatometer, which consists of two parts, the first chamber being respectively set on flat chisel plate close to shovel tip end and the second chamber far from shovel tip end；First chamber is sequentially the cover board of strap bolt, displacement sensor, O-ring seal, piston, waveform spring, O-ring seal from top to bottom；Second chamber is sequentially the cover board of strap bolt, pressure sensor, O-ring seal from top to bottom；It is nut below flat chisel plate.The high-precision flat dilatometer based on 3D printing technique, with in situ, multi-functional, visualization, automation, the features such as self energy so that convenient test, continuous, quick, accurate, economy can not only assess the nonlinear characteristic of the soil body, it has pushed 3D printing technique in the development of geotechnical engineering testing equipment simultaneously, efficiently and effectively test parameter is provided for geotechnical engineering design.
Description
Technical field
The invention belongs to geotechnical engineering testing field, more particularly to a kind of high-precision flat scoop bilge using 3D printing technique
Instrument, belonging to a kind of in geotechnical engineering field can fill with the in-situ test of the visual high-precision automatic of 3D printing technique
It sets.
Background technology
Flat scoop bilge technology is the home position testing method that the seventies in last century, professor Marchetti proposed, refers to using quiet
Power or hammering power keep the steel diaphragm on flat chisel probe laterally swollen by after a flat spade probe penetration test soil layer using air pressure
Swollen a certain distance measures its atmospheric pressure value, according to the air pressure and deformation relationship measured, obtains the parameter of foundation soil, and such as soil surpasses
Knot is crossed than OCR, the coefficient of consolidation etc. of the undrained shear strength of soil, soil.Flat Dilatometer Test is had been widely used in the world, and is taken
Obtain good result.China introduces also rapid popularization after Flat Dilatometer Test, still, is manually controlled in traditional Flat Dilatometer Test
Hydraulic cylinder system pushes steel membrane, and the displacement of steel membrane determined indirectly by measuring the volume change of air pressure, this is by band
Carry out some potential errors, along with traditional flat dilatometer is only capable of measuring three readings：Steel membrane is expanded to 0.05mm outward
With 1.1mm when the bulbs of pressure, and bulbs of pressure when final release steel membrane retracts to 0.05mm.It can only provide limited
Stress-strain diagram is for given depth, and data point when to low stress can only be assumed to linear stress strain paths, it is difficult to obtain
Nonlinear pressure displacement relation is obtained, however having lot of research proves, it is special even if the soil body is under low stress strained situation
Sign is also nonlinear, and such measurement error meeting bigger really cannot continuously reflect the characteristic of the soil body.
In recent years with the rapid development of science and technology, the accelerated development of sensor technology, new flat scoop bilge technology
Occur, along with reaching its maturity for 3D printing technique, application field is more and more extensive so that manufacture is more intelligent, realizes straight
Junction to product manufacturing, software it is integrated, 3D printing technique be based on digital model file, with powdery metal or
Plastics etc. can bonding material, be superimposed by continuous physical layer, successively increase material and generate the technology of 3D solid.Although 3D
There are many breakthrough applications in many fields for printing technique, but using seldom in During Geotechnical Tests field.
The present invention is based on conventional Flat Dilatometer Tests, it is proposed that one kind having in situ, multi-functional, automation, intelligence
The features such as 3D printing technique high-precision micro flat dilatometer so that measurement efficiency is high, result is accurate, is surveyed for geotechnical engineering
It surveys design and efficiently and effectively test parameter is provided.
Invention content
Technical problem：The technical problem to be solved by the present invention is to be directed to traditional Flat Dilatometer Test its device measuring error
Greatly, time-consuming, and degree of intelligence is low, the problems such as having a single function, proposes a kind of with spies such as in situ, multi-functional, automation, intelligences
The high-precision micro flat dilatometer of the 3D printing technique of point.Ground geotechnique can be fast and effeciently measured using the test device
Journey mechanical characteristic, and measurement efficiency is high, test result is accurate.
Technical solution：A kind of high-precision micro flat dilatometer, including flat chisel plate, be set on flat chisel plate close to shovel tip end
First chamber and second chamber far from shovel tip end, being provided on the flat chisel wooden partition between first chamber and second chamber can
Across the via of signal transmssion line and pressure-air；The first chamber is top-down hollow out chamber, and bottom radially extends
There is boss；The second chamber is the hollow chamber of bottom lock, and second chamber bottom is provided with pressure sensor, and top passes through
First cover plate for sealing of strap bolt；
Be provided with displacement sensor, piston and waveform spring in the first chamber, the piston by top major diameter
Ring and the minor diameter goblet of lower section are integrated, and the major diameter ring top edge of the top offers connection via
Through-hole, can be on the inside of communications signals transmission line and pressure-air to piston, fixed displacement sensing on the inside of the minor diameter goblet
Device, minor diameter goblet outside are arranged waveform spring, and described waveform spring one end is contacted with major diameter ring, one end is positioned over boss
On；By the second cover plate for sealing of strap bolt at the top of first chamber, after sealing, the hypanthial bottom surface of minor diameter and first chamber bottom
Portion flushes；
The signal transmssion line of institute's displacement sensors passes through the signal transmssion line of via and first chamber pressure sensor
It is delivered to outside together.
Further, the bolt in the first cover board of the strap bolt and the second cover board of strap bolt is worn from cover board
It crosses, and penetrates flat chisel plate, until flat chisel board bottom portion is fixed by nut.
Further, the first cover board of the strap bolt and the second cover board of strap bolt are sealed by O-ring seal.
Further, it is provided with O-ring seal between the waveform spring bottom and boss.
Further, the flat chisel plate, long 45-55mm, wide 90-100mm, thickness 13-18mm.
Further, the second chamber can be used for configuring installation signal transmssion line, and provide space for assembling.
Further, setting is fluted on the inside of the minor diameter goblet, and displacement sensor is fixedly mounted in groove.
Further, the second cover board of the first cover board of the strap bolt and strap bolt, flat chisel plate and piston pass through 3D
Printed material clothing aluminium powder grain is made.
Further, 3D printing material clothing aluminium powder grain stretch modulus is 3850MPa, density 1380kg/m3, tensile strength
For 52MPa, bending modulus 3700MPa, bending strength 80kPa.
Advantageous effect：The present invention solves that traditional Flat Dilatometer Test its device measuring error is big, and time-consuming, degree of intelligence
It is low, the problems such as having a single function, foundation soil engineering mechanical properties can be fast and effeciently measured, and measurement efficiency is high, test knot
Fruit is accurate, and repeatability is strong.With direct displacement test system and a larger displacement range, can not only assess continuous
The soil counterforce characteristic of line pressure shift, while having pushed 3D printing technique in the development and application of geotechnical engineering testing equipment.
Description of the drawings
Fig. 1 is the element assembling figure of the present invention；
Fig. 2 is the vertical view of flat chisel plate；
Fig. 3 is the upward view of flat chisel plate；
Fig. 4 is flat chisel plate working condition upward view.
Specific implementation mode
Following further describes the present invention with reference to the drawings.
The high-precision micro flat dilatometer based on 3D printing technique of the present invention：Including flat chisel plate 6, it is set to flat chisel plate
On close to shovel tip end first chamber 9 and far from shovel tip end second chamber 10, it is flat between first chamber 9 and second chamber 10
The via of signal transmssion line and pressure-air can be passed through by being provided on shovel board wall；The first chamber 9 is top-down engraves
Plenum chamber, bottom have radially extended boss 11；The second chamber 10 is the hollow chamber of bottom lock, and second chamber bottom is set
It is equipped with pressure sensor 8, top is sealed by the first cover board 1.1 of strap bolt；
Displacement sensor 2, piston 4 and waveform spring 5 are provided in the first chamber 9, the piston 4 is by the big of top
Diameter ring and the minor diameter goblet of lower section are integrated, and the major diameter ring top edge of the top, which offers, to be connected
The through-hole in hole, can communications signals transmission line and pressure-air to 4 inside of piston, fixed displacement on the inside of the minor diameter goblet
Sensor 2, minor diameter goblet outside are arranged waveform spring 5, and 5 one end of the waveform spring is contacted with major diameter ring, one end is put
It is placed on boss 11；9 top of first chamber is sealed by the second cover board 1.2 of strap bolt, after sealing, the hypanthial bottom of minor diameter
Face is flushed with 9 bottom of first chamber；
The signal transmssion line of institute's displacement sensors 2 passes through the signal transmission of via and 9 pressure sensor 8 of first chamber
Line is delivered to outside together.
The design and fabrication of miniature flat dilatometer is divided into the design of miniature Flat Dilatometer Test flat chisel plate, 3D printing flat chisel
Plate, three parts of total system of flat dilatometer, the design of 3D model all parts and installation diagram of flat chisel plate pass through CAD software
It draws and generates.Relate generally to a Flat Dilatometer Test main body flat chisel body, piston, two dismountable 3D printing materials of aluminum powders
With the cover board of other compositions material.Using the piston of an a diameter of 40mm, rather than the steel membrane of conventional 60mm, piston compare steel
Film is more stable especially when displacement becomes much larger.
Second chamber is used for configuring installation circuit and provides space for assembly element.The contact sealing of O-ring different elements
(specifically, the first O-ring seal 3.1 is used for sealing the first cover board 1.1, the second O-ring seal 3.2 is used for sealing piston 4, the
Three O-ring seals 3.3 are used for sealing the second cover board 1.2), the bolt on flat chisel is finally passed through with the bolt on dismountable cover board
Hole is fixed in flat chisel another side with nut, and in this way, the screw thread being easily damaged avoids its hair in 3D printing material
It is raw.
The miniature flat dilatometer flat chisel plate of 3D printing is mainly manufactured by laser sintered process in 3D printing technique
Clothing aluminium powder grain flat chisel, 12 powder filling aluminum of polyamide, polyamide than aluminium there is lower fusing point, sintering to generate one in whole process
Solid body, it is more more economical than direct metal laser sintering in this way, because it needs higher power laser diode and metal powder one
Play work.In nonmetallic materials in 3D printing, clothing aluminium powder grain specifically high-strength rigidity the characteristics of.3D printing not by from it is any
The geometry encountered in the process limits these traditional handicrafts, once flat scoop bilge 3D model flat chisels are sent to laser sintered printer
On, prototype can be obtained in one day time.3D printing material clothing aluminium powder grain stretch modulus is 3850MPa, and density is
1380kg/m3, tensile strength 52MPa, bending modulus 3700MPa, bending strength 80kPa.
Displacement sensor tests the movement of piston in the groove of the bottom of piston, waveform spring be located at piston with
Between flat chisel, under static state, helps to maintain piston and flushed with flat chisel surface line.Pressure sensor is mounted on flat chisel plate
In second chamber, i.e., pressure adjusts exit, can test real-time atmospheric pressure, since two side rooms are perforations, in air pressure
Under effect, air pressure is entered by through-hole above piston in piston, so that air pressure in piston seal region is increased, piston is along waveform bullet
Spring direction moves downward, and displacement sensor can measure the real-time displacement of piston, and whole miniature flat dilatometer system passes through
Computer controls, and for the data collecting system of pressure control, can automatically record measured value and adjust pressure with electricity.It is entire real
It tests program to control by computer, such as loading and unloading cycle and different plus rate of debarkation, you can draw the reality of pressure-displacement
When curve.
The test device retains and improves the function of conventional Flat Dilatometer Test, and it is big to solve its device measuring error,
Time-consuming, and degree of intelligence is low, the problems such as having a single function, can fast and effeciently measure foundation soil engineering mechanical properties, and survey
Amount efficiency is high, test result is accurate, and repeatability is strong.With direct displacement test system and a larger displacement range,
The soil counterforce characteristic of continuous pressure displacement can not only be assessed, and 3D printing technique has been pushed to be set in geotechnical engineering experiment
Standby development and application.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of high-precision micro flat dilatometer, it is characterised in that：Including flat chisel plate (6), it is set on flat chisel plate close to shovel
The second chamber (10) of the first chamber (9) at tip and separate shovel tip end, it is flat between first chamber (9) and second chamber (10)
The via of signal transmssion line and pressure-air can be passed through by being provided on shovel board wall；The first chamber (9) is top-down
Hollow out chamber, bottom have radially extended boss (11)；The second chamber (10) is the hollow chamber of bottom lock, second chamber
Bottom is provided with pressure sensor (8), and top is sealed by the first cover board (1.1) of strap bolt；
It is provided with displacement sensor (2), piston (4) and waveform spring (5) in the first chamber (9), the piston (4) is by upper
The major diameter ring of side and the minor diameter goblet of lower section are integrated, and the major diameter ring top edge of the top offers
The through-hole of via is connected, it can be on the inside of communications signals transmission line and pressure-air to piston (4), on the inside of the minor diameter goblet
Fixed displacement sensor (2), minor diameter goblet outside are arranged waveform spring (5), described waveform spring (5) one end and major diameter
Ring contact, one end are positioned on boss (11)；It is sealed by the second cover board (1.2) of strap bolt at the top of first chamber (9), sealing
Afterwards, the hypanthial bottom surface of minor diameter is flushed with first chamber (9) bottom；
The signal transmssion line of institute's displacement sensors (2) passes through the signal of via and second chamber (10) pressure sensor (8)
Transmission line is delivered to outside together.
2. a kind of high-precision micro flat dilatometer according to claim 1, it is characterised in that：The first of the strap bolt
Bolt in the second cover board (1.2) of cover board (1.1) and strap bolt is passed through from cover board, and penetrates flat chisel plate, until flat chisel plate
Bottom is fixed by nut.
3. a kind of high-precision micro flat dilatometer according to claim 1 or 2, it is characterised in that：The strap bolt
The second cover board (1.2) of first cover board (1.1) and strap bolt is sealed by O-ring seal.
4. a kind of high-precision micro flat dilatometer according to claim 1, it is characterised in that：The waveform spring (5)
It is provided with O-ring seal between bottom and boss (11).
5. a kind of high-precision micro flat dilatometer according to claim 1, it is characterised in that：The flat chisel plate (6),
Long 45-55mm, wide 90-100mm, thickness 13-18mm.
6. a kind of high-precision micro flat dilatometer according to claim 1, it is characterised in that：The second chamber (10)
Installation signal transmssion line can be used for configuring, and space is provided for assembling.
7. a kind of high-precision micro flat dilatometer according to claim 1, it is characterised in that：The minor diameter goblet
Inside setting is fluted, and displacement sensor is fixedly mounted in the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611039037.0A CN106702998B (en) | 2016-11-21 | 2016-11-21 | A kind of high-precision micro flat dilatometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611039037.0A CN106702998B (en) | 2016-11-21 | 2016-11-21 | A kind of high-precision micro flat dilatometer |
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| Publication Number | Publication Date |
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| CN106702998A CN106702998A (en) | 2017-05-24 |
| CN106702998B true CN106702998B (en) | 2018-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611039037.0A Active CN106702998B (en) | 2016-11-21 | 2016-11-21 | A kind of high-precision micro flat dilatometer |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115110509B (en) * | 2022-07-21 | 2023-09-19 | 上海旻悦勘察设计有限公司 | Deep soil lateral load test probe |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1609855A1 (en) * | 1989-03-07 | 1990-11-30 | Калининский политехнический институт | Dilatometer |
| CN202899117U (en) * | 2012-10-30 | 2013-04-24 | 台州市建元工程勘察仪器有限公司 | Test head device special for flat spade diameter test device |
| JP6069761B2 (en) * | 2013-03-27 | 2017-02-01 | 基礎地盤コンサルタンツ株式会社 | Penetration type lateral loading test method and penetration type lateral loading test apparatus |
| CN103306254B (en) * | 2013-06-08 | 2015-03-11 | 温岭市迪信勘察仪器有限公司 | Probe for testing lateral load of deep soil |
| CN203320506U (en) * | 2013-07-02 | 2013-12-04 | 温岭市迪信勘察仪器有限公司 | Pore pressure displacement chisel probe |
| CN204125928U (en) * | 2014-10-24 | 2015-01-28 | 内蒙古工业大学 | Portable static lateral pressure coefficient analyzer |
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2016
- 2016-11-21 CN CN201611039037.0A patent/CN106702998B/en active Active
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| CN106702998A (en) | 2017-05-24 |
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