CN110258671A - Level and foundation pile static loading test system and method based on hydrostatic leveling - Google Patents
Level and foundation pile static loading test system and method based on hydrostatic leveling Download PDFInfo
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- CN110258671A CN110258671A CN201910644442.2A CN201910644442A CN110258671A CN 110258671 A CN110258671 A CN 110258671A CN 201910644442 A CN201910644442 A CN 201910644442A CN 110258671 A CN110258671 A CN 110258671A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
The present invention relates to level and the foundation pile static loading test system and method based on hydrostatic leveling.The present invention samples contactless hydrostatic level, and long service life, stability is good, strong interference immunity.Datum line beam, reference stake and offset table are substituted using measurement hydrostatic level, benchmark hydrostatic level, has evaded the problem difficult to install of traditional approach, has had good adaptability to environment, can be worked normally without special requirement.The distance between the datum mark of this system and measurement point can increase to tens meters, exclude measurement point completely and have an impact during load or unload to datum mark.This measurement method reduces interference, reduces error, improves accuracy rate, and measures conveniently, adaptable.It is suitble to that diameter is big, tension resistance load test of the big foundation pile of tonnage, the big Loading Test of Composite Foundation of processing area；The big subsoil of processing area, artificial foundation load test.
Description
Technical field
The present invention relates to measuring device and methods, more specifically refer to using novel high-precision magnetostriction static level
Instrument, which is realized, eliminates measuring system and measurement method that datum line beam influences in foundation pile static load test.
Background technique
The quality of foundation (such as pile foundation, all kinds of natural or artificial treatment bases) quality depends primarily on two factors,
That is bearing capacity and pile quality, and bearing capacity is the principal element in the two.The accurate test of bearing capacity of single pile is for all kinds of
The design of building basic engineering or even superstructure all plays very important effect.
Static load test is that current determining pile foundation bearing capacity is most direct, one of most reliable method.Static load test is
Refer to and apply axial compressive force, axial uplift force step by step in stake top portion or apply horizontal force at cushion cap bottom surface, observation stake accordingly detects
Sedimentation, uplift displacement or the horizontal displacement that point generates at any time, with the corresponding single pile vertical resistance pressure bearing capacity of determination, vertical anti-
Pull out the test method of bearing capacity or horizontal bearing capacity.
Common static load test method has accumulation load method, anchored pile-testing method, self-balancing approach etc., and in all methods, test pile exists
Shift value under test load effect is one of most important measurement data.Static load test with preloading counter-force boom device is
Example.
As shown in Fig. 1 of Figure of description, test pile obtains bearing capacity, base from jack is from girder in the form of counter-force
Quasi- beam is set up perpendicular to the direction level of stake, and offset table is formed by Magnetic gauge stand and test pile and is rigidly connected, when jack step by step
When load, test pile generates downward sedimentation with the increase of bearing capacity, and test is remained unchanged in default datum line beam state
In the case of, settling amount is obtained relative to the shift value of datum line beam by measurement offset table.
By the above process, it can be seen that, in the overall process of static load test, datum line beam remain stationary state to shift value
It measures particularly important.According to the requirement of static test, the center of reference stake and the centre distance need >=4D of test pile and > 2.0m (D
For the design diameter or hem width of test pile, anchoring pile or earth anchor, its greater is taken).Datum line beam used in static test should have enough
One end of rigidity, beam should be fixed on reference stake, and the other end answers freely-supported on reference stake.
As used stake diameter constantly increases, the single pile static pile testing of this counter-force mode is all different degrees of
The installation difficulty of datum line beam is encountered, using accumulation load method as counter-force, even if building according to JGJ106-2014
Build the requirement of Test Technology of Pile Foundation specification, on the one hand, during the test, it is heavy that test pile is generated by ever-increasing bearing capacity
Drop, due to the characteristic of soil property stick to each other, this sedimentation, which can be formed the ground of surrounding, involves effect；On the other hand, due to test
Time is long, and heap loading capacity is big, encounters the soft situation of soil property, and preloading itself can also impact the ground of surrounding, leads to base
Quasi- stake and datum line beam change in the overall process that test carries out with the variation of landing ground bearing load.
Position in order to guarantee reference stake, to reduce the influence of trial zone disturbance, leads to far from trial zone in actual tests
Frequently with integrally formed, the fashioned iron of length 10m or so is as datum line beam.The fashioned iron of the length is extremely inconvenient in use,
Different static load of pile foundation experiments will choose the datum line beam of different length, both not readily transportable since its length and weight are larger,
Be not easy to daily storage management again, and if datum line beam have in routine use part bend or destroy, can only be by datum line beam
Integral replacement falls, very uneconomical.And datum line beam lengthen after, since its rigidity is inadequate, influenced by temperature change, amount of deflection nor
Chang Xianzhu.
Summary of the invention
It is an object of the invention to overcome the deficiencies of existing technologies, level and the foundation pile based on hydrostatic leveling are provided
Static test system and method.The present invention cancels datum line beam, eliminates influence of the datum line beam to measurement result.Using novel high-precision
It spends magnetostriction hydrostatic level and realizes the measuring system and measurement method for eliminating datum line beam influence in foundation pile static load test
To achieve the above object, the invention adopts the following technical scheme:
A kind of magnetostriction hydrostatic level is set to surge drum upper end including the surge drum for containing pilot anti-icing fluid
Electronics storehouse and one end couples with electronics storehouse and the other end extends to waveguide rod in surge drum；The waveguide rod is equipped with floating ball,
And magnet ring is equipped in floating ball；The waveguide rod is distal to electronics storehouse one end equipped with limited block.
Its further technical solution are as follows: the surge drum upper end is equipped with venthole, and lower end is equipped with linked hole.
A kind of foundation pile static loading test system based on hydrostatic leveling is used including several above-mentioned hydrostatic levels
Jack in the heap microscope carrier for placing clump weight, for applied force；The heap microscope carrier is placed in above foundation pile, and jack is located at
Between on the downside of foundation pile end face and heap microscope carrier；Wherein, several hydrostatic levels include several surveys for being used to measure foundation pile displacement
Hydrostatic level is measured, and for the benchmark hydrostatic level as datum level；The measurement hydrostatic level is distributed in foundation pile
End face；The measurement hydrostatic level mutual connection joins between the benchmark hydrostatic level and measurement hydrostatic level
It is logical.
Its further technical solution are as follows: the foundation pile end face is equipped with bearing plate.
Its further technical solution are as follows: the hydrostatic level is electrically connected with the displacement repeater being equipped with, and in displacement
Pass through the front end machine being equipped with after device and host is electrically connected.
Its further technical solution are as follows: the counter-force girder for stress is equipped on the downside of the heap microscope carrier.
A kind of measurement method of foundation pile dead load,
Foundation pile end face processing is smooth, and the bearing plate that diameter is greater than foundation pile is placed in foundation pile end face；Heap microscope carrier is placed on
Above foundation pile, counter-force girder and bearing plate on the downside of heap microscope carrier place jack；Several are evenly distributed on foundation pile end face mutually
The measurement hydrostatic level of connection, while benchmark hydrostatic level, and benchmark static level are set in the position for being distal to foundation pile
Instrument and the measurement mutual connection of hydrostatic level；
Clump weight is placed above heap microscope carrier, then jack multistage loadings, foundation pile is acted on by the power of jack to be occurred
Movement；The position of benchmark hydrostatic level is constant, and measurement hydrostatic level is moved as foundation pile moves；Benchmark hydrostatic level
And measurement hydrostatic level, due to mutual connection, liquid level changes, and measures fluid change difference to detect the amount of exercise of foundation pile.
Its further technical solution are as follows: when foundation pile generation movement does not move, the initial liquid level of benchmark hydrostatic level
Labeled as h0-0, the initial liquid level of hydrostatic level is measured labeled as h1-0、h2-0、 h3-0...hn-0；After foundation pile moves,
Benchmark hydrostatic level and the liquid level for measuring hydrostatic level change, when reaching stable by the m times, benchmark static(al) water
Quasi- instrument is labeled as h0-m, the initial liquid level of hydrostatic level is measured labeled as h1-m、h2-m、h3-m...hn-m；Wherein, benchmark static(al) water
The fluid change amount Δ h of quasi- instrument0:
Δh0=K (h0-m-h0-0)；
The sensor coefficient of K- benchmark hydrostatic level；
h0-mThe current reading of benchmark hydrostatic level；
h0-0The initial reading of benchmark hydrostatic level；
Measure the fluid change amount Δ h of hydrostatic levelm:
Δhm=K (hn-m-hn-0)；
The sensor coefficient of K- measurement hydrostatic level；
hn-mMeasure the current reading of hydrostatic level；
hn-0Measure the initial reading of hydrostatic level；
Wherein, the variation delta H of the amount of exercise of each test pointm:
ΔHm=Δ h0-Δhm=K (h0-m-h0-0)-K(hn-m-hn-0)；
Wherein, the physics quantity symbol of calculating, positive value are that liquid level rises, and negative value is liquid level decline；
ΔHmIndicate that measuring point floats for positive value, negative value indicates measuring point sedimentation.
Compared with the prior art, the invention has the advantages that: the present invention samples contactless hydrostatic level, uses the longevity
Life length, stability is good, strong interference immunity.Datum line beam, reference stake are substituted using measurement hydrostatic level, benchmark hydrostatic level
And offset table, evade the problem difficult to install of traditional approach, had good adaptability to environment, has been without special requirement
It can work normally.The distance between the datum mark of this system and measurement point can increase to tens meters, exclude measurement point completely and exist
Datum mark is had an impact during load or unload.This measurement method reduces interference, reduces error, improves accuracy rate, and
Measurement is convenient, adaptable.It is suitble to that diameter is big, tension resistance load test of the big foundation pile of tonnage, big compound of processing area
Foundation loading test；The big subsoil of processing area, artificial foundation load test.
The invention will be further described in the following with reference to the drawings and specific embodiments.
Detailed description of the invention
Fig. 1 is the simple view of the prior art；
Fig. 2 is a kind of structure chart of magnetostriction hydrostatic level of the present invention；
Fig. 3 is a kind of installation diagram of the foundation pile static loading test system based on hydrostatic leveling of the present invention；
Fig. 4 is a kind of circuit block diagram of the foundation pile static loading test system based on hydrostatic leveling of the present invention；
Fig. 5 is a kind of position letter view of the initial level of the measurement method of foundation pile dead load of the present invention；
Fig. 6 is a kind of position letter view of the detection liquid level of measurement method of foundation pile dead load of the present invention.
Specific embodiment
In order to more fully understand technology contents of the invention, combined with specific embodiments below to technical solution of the present invention into
One step introduction and explanation, but not limited to this.
Such as Fig. 2 to the drawing of Fig. 6 embodiment of the present invention.
A kind of magnetostriction hydrostatic level 10, as shown in Fig. 2, include the surge drum 11 for containing pilot anti-icing fluid,
Couple set on the electronics storehouse 12 of 11 upper end of surge drum and one end with electronics storehouse 12 and the other end extends to waveguide in surge drum 11
Bar 13.Waveguide rod 13 is equipped with floating ball 14, and is equipped with magnet ring (not marked in figure) in floating ball 14.Waveguide rod 13 is distal to electronics storehouse 12
One end is equipped with limited block 15.
11 upper end of surge drum is equipped with venthole 111, and lower end is equipped with linked hole 112.Linked hole 112 be equipped with for it is other quiet
The conduit of power level connection, so that the 10 mutual connection of energy of each hydrostatic level, since upper end is equipped with venthole 111,
So being equivalent to a linker by the hydrostatic level that conduit links together, liquid level can maintain an equal level.
12 internal emission pulse current of electronics storehouse is along the propagation of waveguide rod 13 and generates magnetic field, inside this magnetic field and floating ball 14
Permanent-magnetic clamp magnetic field meet, generate torsion wave impulse, the relative position of floating ball 14 can be obtained in the time difference for measuring two pulses,
To extrapolate the liquid level variable quantity of 14 place liquid level of floating ball.This hydrostatic level is a kind of contactless liquid level sensor dress
It sets, therefore has the characteristics that long service life, stability are good, precision is high, reproducible etc. numerous.
Preferably, electronics storehouse 12 is electrically connected by conducting wire and distance host, in order to be read to hydrostatic level,
Control etc..
A kind of foundation pile static loading test system based on hydrostatic leveling, it is as shown in Figure 3,4, above-mentioned quiet including several
Power level 10, the jack 23 for placing the heap microscope carrier 21 of clump weight 22, for applied force.Heap microscope carrier 21 is placed in foundation pile
20 tops, and jack 23 is located between 21 downside of 20 end face of foundation pile and heap microscope carrier；Wherein, several hydrostatic levels 10 include
Several are used to measure the measurement hydrostatic level 101 of the displacement of foundation pile 20, and for the benchmark static level as datum level
Instrument 102.Measurement hydrostatic level 101 is distributed in 20 end face of foundation pile.Hydrostatic level 101 is measured to join by conduit between each other
It is logical, it is also by conduit connection, to form a company between the benchmark hydrostatic level 102 and measurement hydrostatic level 101
Logical device.
Hydrostatic level 10 of the invention is 4 and is evenly arranged on foundation pile 20.
Preferably, in order to protect 20 end uniform force of foundation pile, stress destruction is avoided, 20 end face of foundation pile is equipped with bearing plate
24.The diameter of bearing plate 24 is greater than the diameter of foundation pile 20.Jack 23 is placed among bearing plate 24, and measures static level
Instrument 101 is distributed on bearing plate 24 around jack 23.
Wherein, for preferably long-range detection, hydrostatic level 10 is electrically connected with the displacement repeater 25 being equipped with, and position
It moves repeater 25 and passes through the front end machine 26 being equipped with and the electric connection of host 27.
Preferably, front end machine 26 is also electrically connected with other sensors, such as changing sensor；In addition front end machine 26 also with
Pressure sensor 29 is electrically connected, for detecting jack 23 to the pressure of foundation pile.
In order to preferably protect heap microscope carrier 21 and increase the intensity of heap microscope carrier 21, it is equipped on the downside of heap microscope carrier 21 for stress
Counter-force girder 28.
Several measurement hydrostatic levels 101 and benchmark hydrostatic level 102 are contacted with conduit, and are filled in conduit
Pilot liquid (SG solution), by measuring the fluid change between each measurement hydrostatic level 101 and benchmark hydrostatic level 102
Amount, can calculate the settling amount of each measuring point.
A kind of measurement method of foundation pile dead load, it is as shown in Figure 5,6,20 end face processing of foundation pile is smooth, and in foundation pile 20
Place the bearing plate 24 that diameter is greater than foundation pile 20 in end face；Heap microscope carrier 21 is placed on 20 top of foundation pile, in the anti-of 21 downside of heap microscope carrier
Advocate beam and bearing plate 24 places jack 23；The measurement hydrostatic level of several uniformly distributed mutual connection on 20 end face of foundation pile
101, while benchmark hydrostatic level 102 is set in the position for being distal to foundation pile 20, and benchmark hydrostatic level 102 and measurement are quiet
The mutual connection of power level 101.
Clump weight 22 is placed above heap microscope carrier 21, then 23 multistage loadings of jack, foundation pile 20 is by jack 23
Power effect moves；The position of benchmark hydrostatic level 102 is constant, measurement hydrostatic level 101 with foundation pile 20 move and
Movement；Due to mutual connection, liquid level changes, and measures liquid level for benchmark hydrostatic level 102 and measurement hydrostatic level 101
Difference in change detects the amount of exercise of foundation pile 20.
When the generation movement of foundation pile 20 does not move, the initial liquid level of benchmark hydrostatic level 102 is labeled as h0-0, measurement
The initial liquid level of hydrostatic level 101 is labeled as h1-0、h2-0、h3-0...hn-0；After foundation pile 20 moves, benchmark static(al) water
Quasi- instrument 102 and the liquid level for measuring hydrostatic level 101 change, when reaching stable by the m times, benchmark hydrostatic level
102 are labeled as h0-m, the initial liquid level of measurement hydrostatic level 101 is labeled as h1-m、h2-m、h3-m...hn-m；Wherein, benchmark is quiet
The fluid change amount Δ h of power level 1020:
Δh0=K (h0-m-h0-0)；
The sensor coefficient of K- benchmark hydrostatic level 102；
h0-mThe current reading of benchmark hydrostatic level 102；
h0-0The initial reading of benchmark hydrostatic level 102；
Measure the fluid change amount Δ h of hydrostatic level 101m:
Δhm=K (hn-m-hn-0)；
The sensor coefficient of K- measurement hydrostatic level 101；
hn-mMeasure the current reading of hydrostatic level 101；
hn-0Measure the initial reading of hydrostatic level 101；
Wherein, the variation delta H of the amount of exercise of each test pointm:
ΔHm=Δ h0-Δhm=K (h0-m-h0-0)-K(hn-m-hn-0)；
Wherein, the physics quantity symbol of calculating, positive value are that liquid level rises, and negative value is liquid level decline；
ΔHmIndicate that measuring point floats for positive value, negative value indicates measuring point sedimentation.
Detection liquid level in Fig. 5,6, after being the initial level position of 4 measurement hydrostatic levels 101 and being loaded
The sedimentation or lifting after foundation pile stress are detected by the variation of the position of liquid level in position.
In conclusion the present invention samples contactless hydrostatic level, long service life, stability is good, strong interference immunity.
Datum line beam, reference stake and offset table are substituted using measurement hydrostatic level, benchmark hydrostatic level, evaded traditional approach
Problem difficult to install has good adaptability to environment, can work normally without special requirement.The datum mark of this system
The distance between measurement point can increase to tens meters, exclude measurement point completely and produce during load or unload to datum mark
It is raw to influence.This measurement method reduces interference, reduces error, improves accuracy rate, and measures conveniently, adaptable.It is suitble to straight
Diameter is big, the tension resistance load test of the big foundation pile of tonnage, the big Loading Test of Composite Foundation of processing area；The big day of processing area
Right ground, artificial foundation load test.
It is above-mentioned that technology contents of the invention are only further illustrated with embodiment, in order to which reader is easier to understand, but not
It represents embodiments of the present invention and is only limitted to this, any technology done according to the present invention extends or recreation, by of the invention
Protection.Protection scope of the present invention is subject to claims.
Claims (8)
1. a kind of magnetostriction hydrostatic level, which is characterized in that including the surge drum for containing pilot anti-icing fluid, be set to storage
The electronics storehouse and one end of fluid cylinder upper end couple with electronics storehouse and the other end extends to the waveguide rod in surge drum；The waveguide rod
Equipped with floating ball, and magnet ring is equipped in floating ball；The waveguide rod is distal to electronics storehouse one end equipped with limited block.
2. a kind of magnetostriction hydrostatic level according to claim 1, which is characterized in that the surge drum upper end is equipped with
Venthole, lower end are equipped with linked hole.
3. a kind of foundation pile static loading test system based on hydrostatic leveling, which is characterized in that including several claims 1 or
2 described in any item hydrostatic levels, the jack for placing the heap microscope carrier of clump weight, for applied force；The heap microscope carrier
It is placed in above foundation pile, and jack is located between foundation pile end face and heap microscope carrier downside；Wherein, several hydrostatic levels include
Several are used to measure the measurement hydrostatic level of foundation pile displacement, and for the benchmark hydrostatic level as datum level；Institute
It states measurement hydrostatic level and is distributed in foundation pile end face；The mutual connection of the measurement hydrostatic level, the benchmark static(al) water
Connection between quasi- instrument and measurement hydrostatic level.
4. a kind of foundation pile static loading test system based on hydrostatic leveling according to claim 3, which is characterized in that institute
Foundation pile end face is stated equipped with bearing plate.
5. a kind of foundation pile static loading test system based on hydrostatic leveling according to claim 3, which is characterized in that institute
It states hydrostatic level to be electrically connected with the displacement repeater being equipped with, and it is electrical by the front end machine and host being equipped with to be displaced repeater
Connection.
6. a kind of foundation pile static loading test system based on hydrostatic leveling according to claim 3, which is characterized in that institute
State the counter-force girder being equipped on the downside of heap microscope carrier for stress.
7. a kind of measurement method of foundation pile dead load, which is characterized in that
Foundation pile end face processing is smooth, and the bearing plate that diameter is greater than foundation pile is placed in foundation pile end face；Heap microscope carrier is placed on foundation pile
Top, counter-force girder and bearing plate on the downside of heap microscope carrier place jack；Several uniformly distributed mutual connection on foundation pile end face
Measurement hydrostatic level, while be distal to foundation pile position be arranged benchmark hydrostatic level, and benchmark hydrostatic level with
Measure the mutual connection of hydrostatic level；
Clump weight is placed above heap microscope carrier, then jack multistage loadings, foundation pile is moved by the power effect of jack；
The position of benchmark hydrostatic level is constant, and measurement hydrostatic level is moved as foundation pile moves；Benchmark hydrostatic level and survey
Hydrostatic level is measured due to mutual connection, liquid level changes, and measures fluid change difference to detect the amount of exercise of foundation pile.
8. a kind of measurement method of foundation pile dead load according to claim 7, which is characterized in that foundation pile occurs movement and do not send out
When raw movement, the initial liquid level of benchmark hydrostatic level is labeled as h0-0, the initial liquid level of hydrostatic level is measured labeled as h1-0、
h2-0、h3-0...hn-0；After foundation pile moves, benchmark hydrostatic level and the liquid level for measuring hydrostatic level become
Change, when reaching stable by the m times, benchmark hydrostatic level is labeled as h0-m, the initial liquid level for measuring hydrostatic level is labeled as
h1-m、h2-m、h3-m...hn-m；Wherein,
The fluid change amount Δ h of benchmark hydrostatic level0:
Δh0=K (h0-m-h0-0):
The sensor coefficient of K- benchmark hydrostatic level；
h0-mThe current reading of benchmark hydrostatic level；
h0-0The initial reading of benchmark hydrostatic level；
Measure the fluid change amount Δ h of hydrostatic levelm:
Δhm=K (hn-m-hn-0):
The sensor coefficient of K- measurement hydrostatic level；
hn-mMeasure the current reading of hydrostatic level；
hn-0Measure the initial reading of hydrostatic level；
Wherein, the variation delta H of the amount of exercise of each test pointm:
ΔHm=Δ h0-Δhm=K (h0-m-h0-0)-K(hn-m-hn-0)；
Wherein, the physics quantity symbol of calculating, positive value are that liquid level rises, and negative value is liquid level decline；
ΔHmIndicate that measuring point floats for positive value, negative value indicates measuring point sedimentation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404100A (en) * | 2021-07-29 | 2021-09-17 | 广东电网有限责任公司 | Foundation load test device and test method thereof |
| CN113432564A (en) * | 2021-07-13 | 2021-09-24 | 浙江欧感机械制造有限公司 | Detection system without reference beam |
| CN116173651A (en) * | 2023-02-15 | 2023-05-30 | 上海良薇机电工程有限公司 | He molecule stripping off device in liquid source gas based on flow control |
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2019
- 2019-07-15 CN CN201910644442.2A patent/CN110258671A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432564A (en) * | 2021-07-13 | 2021-09-24 | 浙江欧感机械制造有限公司 | Detection system without reference beam |
| CN113404100A (en) * | 2021-07-29 | 2021-09-17 | 广东电网有限责任公司 | Foundation load test device and test method thereof |
| CN116173651A (en) * | 2023-02-15 | 2023-05-30 | 上海良薇机电工程有限公司 | He molecule stripping off device in liquid source gas based on flow control |
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