CN208563407U - The in due course test device of Deep Plate Load Test - Google Patents
The in due course test device of Deep Plate Load Test Download PDFInfo
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- CN208563407U CN208563407U CN201821011028.5U CN201821011028U CN208563407U CN 208563407 U CN208563407 U CN 208563407U CN 201821011028 U CN201821011028 U CN 201821011028U CN 208563407 U CN208563407 U CN 208563407U
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Abstract
The utility model relates to a kind of in due course test devices of Deep Plate Load Test, comprising: loading system, actuating system and test macro；The loading system includes preloading counterweight, datum line beam and buttress, datum line beam is housed below preloading counterweight, datum line beam is supported on buttress, and buttress is supported on foundation surface；The actuating system includes jack, force-transmitting pole, backing plate, bearing plate, end plate, connecting rod, pressure sensor, guy type displacement meter and displacement sensor；The test macro includes pressure sensor, displacement sensor and guy type displacement meter.The beneficial effects of the utility model are: the displacement of bearing plate uses two ways, one is directly measuring the sedimentation of force-transmitting pole in earth's surface, the second is directly measuring the synchronous shift of bearing plate using displacement bar and guy type displacement meter, measurement accuracy is influenced small by hole depth, can avoid the influence to displacement measurement of flexible deformation and bending that ground loading causes force-transmitting pole.
Description
Technical field
The utility model relates to a kind of devices of deep ground earth test of bearing capacity, try more particularly, to a kind of deep layer load
Test in due course test device.
Background technique
The building security of skyscraper, highway, airport, railway, tunnel structure etc. largely depends on
Can Rock And Soil provide enough bearing capacities, control the sedimentation etc. of ground, and foundation bearing capacity and settlement of foundation calculate in ginseng
Number was mainly tested by soil test and originally to determine again, therefore, soil test and be originally to test for all kinds of engineering items
Purpose construction is indispensable.Load test (Loading Test) is added step by step in one rigid bearing plate of field condition
Lotus, the deformation for measuring subsoil or composite foundation change with loads change, so as to determining ground bearing capacity modulus
Test.According to the setting depth and feature of bearing plate, shallow-layer, screw plate loading test and deep flat loading examination can be divided into
It tests.
Plane-plate loading test be suitable for shallow surface ground, especially suitable for it is various banket, the great soil group containing rubble.Due to examination
It is intuitive, simple to test comparison, therefore is widely used for many years, but the use of this method has following limitation: plane-plate loading test
Influence depth range is no more than twice of pressure-bearing board width (or diameter), therefore can only understand shallow surface ground soil characteristics；Pressure-bearing
The size of plate is smaller than practical basis, generates the development of plastic zone at rigid plate edge, more easily causes the destruction of ground, make to estimate
Bearing capacity is relatively low.
Screw plate loading test also has the defect of its own, and since the load of spiral plate is transmitted by transmission rod, this is just
It is required that the rigidity of bar is sufficiently large, in fact if the factors such as connection of barre are taken into account, after bar reaches certain length, it is bound to
Generate certain flexure；In addition spiral plate is further applied load on ground using jack pair transmission rod, the verticality of transmission rod
It is the key factor for influencing test result reliability and accuracy.Here, the smaller scope of application of screw plate loading test, mainly
It is to be applied to weak soil, pan soil is still difficult to screw in；Even its side point depth of weak soil be also it is limited, reason first is that with depth
Increase, not casting screw in resistance increase, limit the depth of measuring point.
Deep plate load testing refers to the load of the intensity and deformation behaviour done inside semi-infinite body to certain layer soil body
Lotus test, compared with other home position testing methods, load test can design for High-Rise Building Deep Foundation and provide relatively reliable hold
Power layer and its design-calculateds data such as subjacent bed soil bearing capacity and deformation modulus.But deep plate load testing device has it
Shortcoming: (1) displacement measurement accuracy is low, the reason is that ground loading causes the flexible deformation and bending and counter-force of force-transmitting pole
The displacement and deformation etc. of system all directly influence the measurement accuracy of bearing plate actual displacement, and topside readout can not represent pressure-bearing
The displacement of the true load of plate；(2) friction between force-transmitting pole and hole wall, which makes ground be further applied load, cannot faithfully pass to pressure-bearing
Plate；(3) measuring accuracy of above-mentioned displacement and load is reduced with depth.
In order to solve the problems, such as deep plate load testing device and test method, deep layer is more precisely utilized
Plate measures load and settling data, propose a kind of in due course test device of Deep Plate Load Test and test method and its
Technique is particularly important.
Utility model content
The purpose of the utility model is to overcome deficiency in the prior art, a kind of Deep Plate Load Test is provided and tests dress in due course
It sets.
This in due course test device of Deep Plate Load Test, including loading system, actuating system and test macro；
The loading system includes preloading counterweight, datum line beam and buttress, and datum line beam, datum line beam branch are housed below preloading counterweight
It holds on buttress, buttress is supported on foundation surface；
The actuating system includes jack, force-transmitting pole, backing plate, bearing plate, end plate, connecting rod, pressure sensor, bracing wire
Formula displacement meter and displacement sensor, jack are located on the backing plate connected immediately below datum line beam, and two sides are laid with position above backing plate
Displacement sensor, backing plate center are equipped with the conducting wire that aperture is used to be pierced by displacement bar and pressure sensor；Backing plate is welded on force-transmitting pole,
It is equipped with end plate below force-transmitting pole, is equipped with pressure sensor below end plate, pressure sensor is located on bearing plate, bearing plate and end plate
It is welded and fixed together by pressure sensor, connecting rod is additionally provided between bearing plate and end plate, phase between connecting rod and end plate
To sliding；
The test macro includes pressure sensor, displacement sensor and guy type displacement meter；The conducting wire of pressure sensor
Connection data collecting instrument, the terminal connecting test system of data collecting instrument are pierced by through end plate, backing plate；Guy type displacement meter is fixed on
On displacement bar, displacement bar top is fixed by the straightening device of earth's surface, and displacement bar lower part is connect with connecting rod.
As preferred: the preloading counterweight carries out counterweight by sand pocket or concrete test block, and the standard counterweight of sand pocket is 50~
100kg/ bags.
As preferred: the datum line beam is to intersect the I-steel stacked.
As preferred: the jack is made of 2~3 calibrated hydraulic jacks, pressure gauge and oil pump.
As preferred: the force-transmitting pole is made of φ 500~600mm pile for prestressed pipe.
The beneficial effects of the utility model are:
(1) displacement of bearing plate uses two ways, one is the sedimentation of force-transmitting pole is directly measured in earth's surface, the second is
Directly measure the synchronous shift of bearing plate using displacement bar and guy type displacement meter, measurement accuracy is influenced small by hole depth, can avoid
Ground loading causes the influence of the flexible deformation and bending of force-transmitting pole to displacement measurement.
(2) pressure sensor is directly installed on bearing plate, and the pressure value of pressure sensor outflow is bearing plate reality
Received pressure value can avoid the influence of friction between force-transmitting pole and hole wall to the true load of bearing plate.
(3) this method in due course, accurately, reliably can automatically determine load and settling data, automatic in real time to determine that classification adds
Lotus amount, loading stabilization and junior's load construction time terminate load time and the characteristic load bearing capacity of ground etc., to improve depth
Layer plate precision, reduces artificial decision errors.
Detailed description of the invention
FIG. 1 is a schematic structural view of the utility model；
Fig. 2 is the A-A diagrammatic cross-section of Fig. 1.
Description of symbols: 1- preloading counterweight；2- datum line beam；3- jack；4- buttress；5- force-transmitting pole；6- backing plate；7- is held
Pressing plate；8- end plate；9- connecting rod；10- pressure sensor；11- guy type displacement meter；12- displacement bar；13- conducting wire；14- data
Acquisition Instrument；15- backfill；16- ground；17- test macro；18- straightening device；19- displacement sensor；20- aperture.
Specific embodiment
The utility model is described further below with reference to embodiment.The explanation of following embodiments is only intended to help to manage
Solve the utility model.It should be pointed out that for those skilled in the art, not departing from the utility model principle
Under the premise of, several improvements and modifications can be made to this utility model, these improvement and modification also fall into the utility model
In scope of protection of the claims.
Embodiment one
The in due course test device of the Deep Plate Load Test, including loading system, actuating system and test macro.
Loading system is realized by preloading counterweight 1, and datum line beam 2 is housed below preloading counterweight 1, and datum line beam 2 is supported on buttress 4
On, buttress 4 is supported on 16 surface of ground.
Actuating system include jack 3, force-transmitting pole 5, backing plate 6, bearing plate 7, end plate 8, connecting rod 9, pressure sensor 10,
Guy type displacement meter 11 and displacement sensor 19, jack 3 are located on the backing plate 6 connected immediately below datum line beam 2,6 top of backing plate
Two sides are laid with displacement sensor 19, and 6 center of backing plate is equipped with aperture 20 and is used to be pierced by leading for displacement bar 12 and pressure sensor 10
Line 13；Backing plate 6 is welded on force-transmitting pole 5, and end plate 8 is equipped with below force-transmitting pole 5, is equipped with pressure sensor 10, pressure below end plate 8
Sensor 10 is located on bearing plate 7, and bearing plate 7 and end plate 8 are welded and fixed together by pressure sensor 10, bearing plate 7 with
Connecting rod 9 is additionally provided between end plate 8, it can opposite sliding between connecting rod 9 and end plate 8.
Test macro includes pressure sensor 10, displacement sensor 19 and guy type displacement meter 11；Pressure sensor 10
Conducting wire 13 is pierced by through end plate 8, backing plate 6 connects data collecting instrument 14, the terminal connecting test system 17 of data collecting instrument 14, in real time
Determine stable stage loading and next stage load application time, terminate load time, displacement etc.；Displacement is by guy type displacement meter 11
It is measured with displacement sensor 19, guy type displacement meter 11 is fixed on displacement bar 12, and dress is straightened by earth's surface in 12 top of displacement bar
It sets 18 to fix, keeps its stability, 12 lower part of displacement bar is connect with connecting rod 9.
In this particular embodiment, preloading counterweight 1 can carry out counterweight, sand pocket standard counterweight 50 by sand pocket or concrete test block
~100kg/ bags；Datum line beam 2 is to intersect the I-steel stacked, and sectional dimension need to carry out checking computations determination according to preloading；Jack 3
Precision pressure gauge and high pressure, oil pump by 2~3 calibrated hydraulic jacks with 0.4 grade form.
In this particular embodiment, force-transmitting pole 5 byPile for prestressed pipe composition, bearing plate 7 are area
0.5m2Circular steel plate, diameterThickness h=30~50mm.
In this particular embodiment, 0~100mm of range of displacement sensor 19, precision 0.1%FS, operating temperature -25~
+85℃；The measurement stroke of guy type displacement meter 11 long 0~1300mm, precision 0.1%FS, degree of protection IP65, shell and line wheel
Pass through preservative treatment, traction rope is that stainless steel is applied with Teflon；Pressure sensor 10 be 2~3, range be 0~
500kN, sensitivity are 1.5 ± 0.05mV/V, and operating temperature range is -20 DEG C~+80 DEG C；14 resolution ratio of data collecting instrument is 16
~32bit, precision are better than 0.02% (full scale), and highest practical sample frequency is 100~200kHz, and 16~32 moulds enter logical
Road, single-ended mould enter range ± 5V~± 10V, and input impedance is 100~200M Ω, and memory is 32~64kB.Test macro 17
Deep layer load and test analysis software are installed, have data processing, analysis, drawing and warning function.
Embodiment two
The Deep Plate Load Test in due course test device ground test method, comprising the following steps:
(1) Deep Plate Load Test device is installed
Using machine drilling or manually digging hole to predetermined depth, then by bearing plate 7, end plate 8, the pressure sensing of force-transmitting pole 5
Device 10, connecting rod 9, displacement bar 12, guy type displacement meter 11 are sequentially connected fixation, lift by crane tripping in bottom hole, then by force-transmitting pole 5 and hole
Backfill 15 is arranged in gap between wall, it is ensured that force-transmitting pole 5 is vertical.In 5 top composition backing 6 of force-transmitting pole, install jack 3,
Buttress 4, datum line beam 2 carry out counterweight using sand pocket or concrete test block.The conducting wire 13 of pressure sensor 10 is worn on backing plate 6
It is connected to data collecting instrument 11 out, reconnects test macro 17, the straightening device 18 of 12 upper end of displacement bar connection earth's surface is formed
One in due course test macro of complete Deep Plate Load Test.
(2) the in due course test method of Deep Plate Load Test
It is classified by force-transmitting pole 5 to bearing plate 7 using jack 3 and applies pressure.When this grade of Load-settlement of arrival is stablized,
Measure the pressure and shift value of bearing plate 7.First, the pressure gauge carried from jack 3 shows the payload values on force-transmitting pole 5,
The reading being acquired by two displacement sensors 19 being symmetrically installed on the backing plate 6 of force-transmitting pole 5 is indirectly testing knot
Fruit.Second, directly measuring the reading of pressure sensor 10 and the guy type displacement meter 11 on bearing plate 7 using data collecting instrument 14
Reading, be direct test result.
In this particular embodiment, the displacement measurement of bearing plate 7, in addition to other than earth's surface directly measures the sedimentation of force-transmitting pole 5,
Also it is connect by displacement bar 12 with connecting rod 9, solid on bearing plate 7, axis hole of the upper end on end plate 8 is twisted in 9 lower end of connecting rod,
The slide downward with the sinking of bearing plate 7 of connecting rod 9 installs guy type displacement meter 11, on displacement bar 12 in the middle part of displacement bar 12
It holds and is connected with fixed straightening device 18, so that displacement bar 12 is in plumbness, and with 7 synchronous shift of bearing plate, by stay-supported
The displacement that displacement meter 11 is spread out of is the actual displacement of bearing plate 7, and the measurement accuracy of this displacement measurement system by
Hole depth influences very little.
In this particular embodiment, other than reading pressure from the pressure gauge on jack 3, also pressure sensor 10 is filled
On bearing plate 7, the sum of the pressure that each pressure sensor 10 exports, is the load that bearing plate 7 actually receives.Although the load
It is similarly from the jack 3 and force-transmitting pole 5 on ground, but the size of the frictional resistance of force-transmitting pole 5 and hole wall does not influence pressure-bearing
The load measurement value of plate 7, no matter the depth of instrument connection, 7 load measurement precision of bearing plate is unaffected.
In this particular embodiment, using the data collecting instrument of multichannel 14, automatic storage P-S-T data, and pass through depth
The layer in due course test macro of load test is loaded, is unloaded, terminating load judgement:
1. load: stage loading Pin, n=12 grades of grade, the first order is 2 times for being classified load, and load accuracy in measurement is not answered
Lower than ± the 1% of peak load, load is by accumulative settling amount 32mm control, as accumulative settling amount does not surpass when being loaded onto peak load
32mm is crossed then to continue to load；
2. setting initial value 0 for time t, on-test, utilizes the bracing wire in the in due course test macro of Deep Plate Load Test
Formula displacement meter 11 and displacement sensor 19 measure the settling amount S of corresponding position respectivelyi0.When interior when continuous two small, per hour
Settling amount be less than 0.1mm when, then it is assumed that become stable, system alarm prompt stabilization can add junior's load.The moment definition is
T acquires the sedimentation value S of each displacement sensor 19 of t momentint, draw and obtain settling amount SintWith the curve relation figure between time t
For test analysis.
3. load can be terminated when there are following situations for the moment:
A. the settling amount of the same level load is greater than 5 times of prime Load-settlement amount, and obvious steep drop occur in load and subsidence curve；
B. under certain level-one load, the interior rate of settling cannot reach opposite stability criterion for 24 hours；
C. the accumulative settling amount of Deep Plate loading test and 7 diameter ratio of bearing plate are more than or equal to 0.04；
D. the sedimentation for being loaded onto the maximum finder charge and bearing plate 7 of requirement reaches opposite stability criterion.
Respectively testing hole depth due to same formation may be inconsistent, and data analytic explanation is carried out by taking i-th of test hole as an example,
Assuming that it shares 3 pressure sensors 10, then the initial pressure value of each pressure sensor 10 is respectively Pi10、Pi20、Pi30, bracing wire
The shift value of formula displacement meter 11 is Si0；Pressure gauge reading analysis on 2 jack 3 is P 'i10、P’i20, displacement sensor 19
Displacement S 'i0；
Under n-th grade of load action, the displacement readings of certain moment t guy type displacement meter 11 are Sint, displacement sensor 19
Displacement S 'int；Within continuous two hours, the displacement readings of guy type displacement meter 11 are Sin(t+1)、Sin(t+2), displacement sensor
19 displacement S 'in(t+1)、S’in(t+2), work as Sin(t+1)-Sint< 0.1mm, Sin(t+2)-Sin(t+1)< 0.1mm, S 'in(t+1)-S’int<
0.1mm, S 'in(t+2)-S’in(t+1)When < 0.1mm, then it is assumed that become stable, system alarm prompt stabilization can add junior's load, and note should
T+2 moment definition is moment T, the cumulative settling value S of acquisition T moment guy type displacement meter 11, displacement sensor 19in=
Sin(t+2)-Si0、S’in=S 'in(t+2)-S’i0, the same level sedimentation value △ Sin=Sin(t+2)-Si(n-1)(t+2)、△S’in=S 'in(t+2)-
S’i(n-1)(t+2)。
The reading of stablizing of each pressure sensor 10 is respectively P under n-th grade of load actioni1n、Pi2n、Pi3n, stay-supported displacement
The stable displacement reading of meter 11 is Sin；Pressure gauge reading analysis on 2 jack is P 'i1n、P’i2n, displacement sensor 19
Stable displacement reads S 'in；Pressure is respectively as follows: under n-th grade of load action
Pin=[(Pi1n-Pi10)+(Pi2n-Pi20)+(Pi3n-Pi30)]/3
P’in=[(P 'i1n-P’i10)+(P’i2n-P’i20)]/2
In monitoring system, P is drawn by above formula automaticallyin~Sin、P’in~S 'inCurve.
Stage loading takes 12 grades, and under the 12nd grade of load action, load is loaded onto maximum by accumulative settling amount 32mm control
Such as accumulative settling amount S when loadin、S’inIt is less than 32mm then to continue to load, until Sin、S’in>32mm。
Embodiment three
Rail traffic Fenghua, Ningbo line engineering ground, which is located at, rather gives Plain region, and south China Gary is belonged on geotectonic position
Eastern fold system Southeastern Zhejiang Province fold belt Lishui-Ningbo rumble strip.According to areal geology and this exploration data, proposed place stratum
Belong to southeast stratigraphic region, pre-Quaternary stratum is mainly Upper Jurassic (J3c) tufa stone within the scope of depth of exploration.Quaternary Stratigraphic
Development, thickness change is larger, and it is thickness about 32.6~47.0m that prospecting, which discloses, and stratum generally had from Middle Pleistocene to the Recent Epoch
Development, genetic type are more.Each engineering geology sub-layer Engineering Geologic Characteristics are commented as follows: 1.1b: plain fill (mlQ), 1.1c: it ploughs
It plants native (mlQ), 1.2Layer: silty clay (al-lQ43), 1. 3c layers: very soft sill clay (mQ34), 2.1Layer: silty clay
(al-lQ43)、②2aLayer: mud (mQ42), 2.2TLayer: middle sand (mQ42), 3.1bLayer: middle sand (al-mQ41), 8.3bLayer: cobble
(alQ31)、⑩2aLayer: round gravel (dl-plQ21), 10.2bLayer: circle gravel (dl-plQ21).In this particular embodiment, pass through scene
Deep plate load testing has inquired into the foundation bearing capacity of rail traffic Fenghua, Ningbo line engineering 8. layer foundation of gravelly soil, is rail
Road traffic design, construction provide technical support.
1, testing program
The engineering ground is located at Fenghua area, Ningbo City.The engineering utilization subsoil.Force-transmitting pole 5 is tested to use
0.5m is welded in pile for prestressed pipe, bottom end2Bearing plate 7.Test point parameter is as shown in table 1:
1 measuring point of table is laid
| Serial number | Pilot number | Pressure-bearing plate suqare | Ground elevation (m) | Measuring point absolute altitude (m) |
| 1 | S1# | 0.5m2 | +4.9 | -4.1 |
| 2 | S2# | 0.5m2 | +4.9 | +1.9 |
Test basis uses " building foundation technical specification " JGJ 340-2015.
(1) test uses 0.5m2Round bearing plate 7, force-transmitting pole 5 (Tubular pole) with bearing plate 7 be connected to become entirety,
As shown in Figure 1；
(2) scene determines testing site position, and the well testing diameter of test is equal to 7 diameter of bearing plate, depth of testing pits and design base
Plinth buried depth is consistent, the top of force-transmitting pole 5 50cm above ground level；
(3) stage loading grade takes 12 grades, and the first order is 2 times for being classified load, and load accuracy in measurement is not lower than maximum
± the 1% of load, load is by accumulative settling amount 32mm control, when being loaded onto peak load if accumulative settling amount is less than 32mm
Continue to load；
(4) it after every grade of load, by interval 10,10,10,15,15min, is surveyed later every 30min and reads a settling amount, when
Within continuous two hours, when settling amount hourly is less than 0.1mm, then it is assumed that become stable, junior's load can be added；Unloading
When, every grade of load maintains 1h, should survey by 10min, 30min, 60min and read 7 settling amount of bearing plate；After being offloaded to zero, reading should be surveyed
7 residual settlement amount of bearing plate is held time as 3h, and surveying read time should be 10min, 30min, 60min, 120min, 180min.
(5) when there are following situations for the moment, load can be terminated:
1) settling amount of the same level load is greater than 5 times of prime Load-settlement amount, and obvious steep drop occur in load and subsidence curve；
2) under certain level-one load, the interior rate of settling cannot reach opposite stability criterion for 24 hours；
3) the ratio between accumulative settling amount Yu bearing plate diameter of Deep Plate loading test are more than or equal to 0.04；
4) it is loaded onto the maximum finder charge of requirement and the sedimentation of bearing plate 7 reaches opposite stability criterion.
(6) determination of characteristic load bearing capacity
1) when there are obvious ratio limits on p-s curve, payload values corresponding to the ratio limits are taken；
2) foundation soil plane-plate loading test takes limit lotus when ultimate load is less than 2 times of corresponding ratio limits payload values
Carrying is worth half；
3) when meeting termination loading environment, and ratio limits can not be determined on p-s curve, bearing capacity and the not up to limit
When, foundation soil plane-plate loading test takes payload values corresponding to the half of maximum finder charge.
4) when determining natural foundation bearing capacity characteristic value by relative deformation value, low compressibility soil corresponding deformation value is taken
0.010b, the characteristic load bearing capacity that middle compressibility soil corresponding deformation value takes 0.012b, and taken are not more than maximum finder charge
Half.
2, field test
First prefabricated 0.5m27 two pieces of round bearing plate, board diameterWith a thickness of 5cm, material is iron.This examination
The deep layer payload oscillation of two measuring points of total design is tested, depth is respectively 9m and 3m.Before test, using drilling machine elder generation pore-forming, apertureDisturbance should be avoided in the ground of bottom hole, and laying is levelling no more than the sand bedding course of 20mm under bearing plate 7.From starting
From when mentioning the drill bit of smooth bottom hole, it is lowered into bottom hole this period to bearing plate 7, hole wall ground there should not be collapsing and breaking to fall into
Bottom hole.Otherwise, test result provides serious distortion to the test result not conformed to the actual conditions, it will bring to Base foundation design
Project cost increases or serious hidden dangers in project.Therefore, hole wall stabilization technique must be resolved conscientiously.
The force-transmitting pole pile end board 8 cut in advance is welded with bearing plate 7, lifts by crane, transfer to predetermined absolute altitude, by rigid biography
Power bar is connected to earth's surface.Force-transmitting pole 5 and hole wall gap are backfilled again, earth's surface leveling, using ballast platform counter force system, by
The composition such as girder, I-steel, heap weight, prepares static test.The lower dress of bearing plate 7 and proposition should meet following requirement:
(1) coarse sand or middle sand should be launched to bottom hole before filling bearing plate 7 under, bottom hole is made to form the sand pad of thickness 20mm or so
Layer.
(2) must be steady, slow when transferring bearing plate 7, mitigation bearing plate 7, which is hit, scrapes hole wall, avoids the occurrence of silt particle and falls into hole
Bottom.
(3) equal triangular forms equidistantly lay 3 pressure sensors 10 between bearing plate 7 and end plate 8, and conducting wire 13 is fixed.
(4) displacement bar 12 is after 7 tripping in bottom hole of bearing plate, then tripping in and is twisted joint with screw thread in the dedicated of 7 upper end of bearing plate
Joint screw thread hole in.
(5) after the test, first power transmission pipe capital is risen with jack 3, so that bearing plate 7 is detached from bottom hole, mentions unloading again later
Power transmission tubing string.
In static load test, in stake top pre-add 100kPa load, to reduce stake bottom sedimentation bring sedimentation error, then divide
Grade load, measures the settling amount of every grade of load.
3, test result and evaluation
Shown in S1#, S2# measuring point deep plate load testing summary sheet 2 and 3, wherein directly acquiring 3 pressure sensors 10
Reading, and be averaged as dead load P, the shift value of guy type displacement meter 11 is as its settling amount S.Due to Pin<P’in、Sin
>S’in, and the shift value that pressure sensor 10 and guy type displacement meter 11 measure more meets engineering reality, the present embodiment only provides
Pressure sensor 10 and guy type displacement meter 11 measure static test data.
2 S1# measuring point Deep Plate static test summary sheet of table
3 S2# measuring point Deep Plate static test summary sheet of table
Test result is obtained by on-site test and comprehensive analysis to be shown in Table 4.
4 deep plate load testing achievement gathering table of table
Claims (5)
1. a kind of in due course test device of Deep Plate Load Test, it is characterised in that including loading system, actuating system and test macro；
The loading system includes preloading counterweight (1), datum line beam (2) and buttress (4), and datum line beam is housed below preloading counterweight (1)
(2), datum line beam (2) is supported on buttress (4), and buttress (4) is supported on ground (16) surface；
The actuating system include jack (3), force-transmitting pole (5), backing plate (6), bearing plate (7), end plate (8), connecting rod (9),
Pressure sensor (10), guy type displacement meter (11) and displacement sensor (19), jack (3) are located at immediately below datum line beam (2)
On the backing plate (6) of connection, two sides are laid with displacement sensor (19) above backing plate (6), and backing plate (6) center is used equipped with aperture (20)
In the conducting wire (13) for being pierced by displacement bar (12) and pressure sensor (10)；Backing plate (6) is welded on force-transmitting pole (5), force-transmitting pole (5)
Lower section is equipped with end plate (8), is equipped with pressure sensor (10) below end plate (8), and pressure sensor (10) is located on bearing plate (7),
Bearing plate (7) is welded and fixed together with end plate (8) by pressure sensor (10), is also set between bearing plate (7) and end plate (8)
Have connecting rod (9), opposite sliding between connecting rod (9) and end plate (8)；
The test macro includes pressure sensor (10), displacement sensor (19) and guy type displacement meter (11)；Pressure sensing
The conducting wire (13) of device (10) is pierced by connection data collecting instrument (14), the terminal of data collecting instrument (14) through end plate (8), backing plate (6)
Connecting test system (17)；Guy type displacement meter (11) is fixed on displacement bar (12), displacement bar (12) top by earth's surface drawing
Straight device (18) is fixed, and displacement bar (12) lower part is connect with connecting rod (9).
2. the in due course test device of Deep Plate Load Test according to claim 1, it is characterised in that the preloading counterweight (1) by
Sand pocket or concrete test block carry out counterweight, and the standard counterweight of sand pocket is 50~100kg/ bags.
3. the in due course test device of Deep Plate Load Test according to claim 1, it is characterised in that the datum line beam (2) is to hand over
Pitch the I-steel stacked.
4. the in due course test device of Deep Plate Load Test according to claim 1, it is characterised in that the jack (3) is by 2
~3 calibrated hydraulic jacks, pressure gauge and oil pump composition.
5. the in due course test device of Deep Plate Load Test according to claim 1, it is characterised in that the force-transmitting pole (5) is by φ
500~600mm pile for prestressed pipe composition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821011028.5U CN208563407U (en) | 2018-06-28 | 2018-06-28 | The in due course test device of Deep Plate Load Test |
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| CN201821011028.5U CN208563407U (en) | 2018-06-28 | 2018-06-28 | The in due course test device of Deep Plate Load Test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108661091A (en) * | 2018-06-28 | 2018-10-16 | 宁波大学 | A kind of in due course test device of Deep Plate Load Test and test method |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108661091A (en) * | 2018-06-28 | 2018-10-16 | 宁波大学 | A kind of in due course test device of Deep Plate Load Test and test method |
| CN108661091B (en) * | 2018-06-28 | 2023-06-20 | 宁波大学 | Timely testing device and testing method for deep load test |
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