CN110004998A - A kind of bored concrete pile test pile apparatus and its pile testing method - Google Patents
A kind of bored concrete pile test pile apparatus and its pile testing method Download PDFInfo
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- CN110004998A CN110004998A CN201910396236.4A CN201910396236A CN110004998A CN 110004998 A CN110004998 A CN 110004998A CN 201910396236 A CN201910396236 A CN 201910396236A CN 110004998 A CN110004998 A CN 110004998A
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- 238000012360 testing method Methods 0.000 title claims abstract description 168
- 238000006073 displacement reaction Methods 0.000 claims abstract description 39
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- 239000000463 material Substances 0.000 claims description 7
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- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000009435 building construction Methods 0.000 abstract description 2
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- 238000007596 consolidation process Methods 0.000 description 2
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
Abstract
The present invention relates to mechanical technical field of building construction, more particularly to a kind of bored concrete pile test pile apparatus and its pile testing method, on the one hand by installing pile cover on test pile, and lower cushion block is placed on pile cover to keep vertical pressure balanced, on the other hand the size of test load is adjusted by the quantity of jack and concrete test block counterweight, and pass through buttress, intermediate box-girder, edge box-girder, distribution beam supports concrete test block counterweight, to ensure that the safety of jack counterweight platform in jacking or decline, and multiple displacement sensors by being set to around test pile obtain the vertical displacement of test pile, to improve the accuracy of test pile apparatus settling data；And the test pile apparatus is suitable for various piles with different diameters, different pressure testing loads, it is versatile；And there is vertical pressure equilibrium, the accuracy of pile foundation settlement test data is high, and use is safe, and production and assembling are simple, and it is convenient to install and remove, the advantages of easily reuse.
Description
Technical field
The present invention relates to technical field of building construction more particularly to a kind of bored concrete pile test pile apparatus and its pile testing method.
Background technique
For construction-engineering project, especially some heavy constructions, bridge foundation structure, pile foundation suffered top in use
Load is very big, generally according to the ground and pile foundation engineering acceptance specification of country, should carry out bearing capacity static test, test pile master to pile foundation
Syllabus it is as follows: verifying single pile vertical resistance pressure bearing capacity whether meet design requirement, pass through Internal forces and deformation test, measurement
Pile body integrity is detected in stake side, end resistance, and whether verifying geological conditions, which surveys report with ground, is coincide.
Currently, carrying out in static-loading test to pile foundation, the country, which generallys use, places thousand at the top of test pile
Jin top, installs a counterweight platform on thousand hand tops, and counterweight generally takes concrete block, the materials such as sand pocket, when starting jack,
Jack jacks counterweight platform and generates in jack base generation counter-force, which acts at the top of test pile, passes through thousand
The pressure gauge on jin top aobvious numerical value be loaded value at the top of test pile, survey is read by the displacement sensor of test pile side wall
Sedimentation value of the test pile under different loads.The test pile apparatus has the following disadvantages: that the temporary rest pier of support counterweight platform is being pressurized
Elevation of top is inconsistent afterwards easily leads to counterweight platform inclination, pile foundation bear vertical load and when settling, encounter geological conditions compared with
When difference is uneven, slight inclination may occur for pile foundation, cause test data inaccurate or even counterweight platform is collapsed, in addition, matching galassing
Counterweight position on platform is asymmetric uniformly, also results in the vertical force reached on jack and pile foundation and generates at the top of pile foundation
Eccentricity pressure, causes pile foundation settlement value inaccurate and to may cause counterweight platform unbalance and collapse, in addition, test pile apparatus versatility
Difference often needs to take different counterweight platform devices when testing piles with different diameter, and economy is bad.These are all those skilled in the art
Institute's urgent problem to be solved.
Summary of the invention
In order to overcome in the prior art bored concrete pile test pile apparatus pile foundation settlement the data precision is low, counterweight platform easily it is unbalance fall
It collapses, the shortcomings that poor universality, the invention discloses a kind of bored concrete pile test pile apparatus, wherein including test pile, pile cover, lower cushion block,
Upper cushion block, jack, box-girder, distribution beam, concrete pad, supporting beam, buttress and multiple reference stakes；
The pile cover lid is located on the test pile, and the lower cushion block, the jack and the upper cushion block are according under
Supreme sequence is set in turn on the pile cover, and the top of the upper cushion block is provided with box-girder, and the bottom of the box-girder
Portion corresponds to two sides and passes through the buttress to be connect with ground, and distribution beam is provided on the box-girder, the concrete pad
It is set in the distribution beam；
Multiple reference stakes are all set in around the test pile, are respectively connected with described in one on each reference stake
Supporting beam, and the supporting beam closes on one end of the pile cover and is fixedly installed displacement sensor.
Above-mentioned bored concrete pile test pile apparatus, wherein the top of the pile cover is plane, and the top and ground of the pile cover
Between height be not less than 400mm.
Above-mentioned bored concrete pile test pile apparatus, wherein 4 reference stakes, and each institute are provided with around the test pile
Stating distance of the reference stake apart from the test pile outer diameter is 1.2~1.6m, and one end of the supporting beam and the reference stake hang down
Direct-connected to connect, the other end is connect with institute's displacement sensors.
Above-mentioned bored concrete pile test pile apparatus, wherein the test pile apparatus include intermediate box-girder and be located at the intermediate box
The edge box-girder of ellbeam two sides；
The bottom of the intermediate box-girder and the edge box-girder corresponds to two sides and passes through the buttress to be connect with ground.
Above-mentioned bored concrete pile test pile apparatus, wherein the material of the upper cushion block and the lower cushion block is steel.
Above-mentioned bored concrete pile test pile apparatus, wherein the upper surface of the concrete test block is provided with hanging ring.
The invention discloses a kind of bored concrete pile pile testing methods, wherein above-mentioned bored concrete pile test pile apparatus, the pile testing method
Include the following steps:
Step S1 jacks the jack, and after the box-girder leaves the buttress, reads the pressure of the jack
The reading of power table；
Step S2 calculates the load that the test pile is born according to the reading of the pressure gauge of the jack；
Step S3 reads the measurement data of multiple institute's displacement sensors, and according to the survey of multiple institute's displacement sensors
Measure the vertical displacement amount of test pile described in data acquisition；
Continue stacked concrete test block on step S4, Yu Suoshu concrete test block and item is loaded with the next stage for reaching load
Part；
Step S5 is repeated in the step S3~S4, until meeting the condition for terminating loading test
Step S6, concrete test block described in load shedding.
Above-mentioned bored concrete pile pile testing method, wherein in the step S3, the vertical displacement amount of the test pile is multiple institutes
The average value of the measurement data of displacement sensors.
Above-mentioned bored concrete pile pile testing method, wherein in the pile testing method, pressed in first hour after every grade of load applies
It surveys the vertical displacement amount for reading the test pile within 5th, 15,30,45,60 minute, is read once every survey in 30 minutes later, and when test
The stake rate of settling applies next stage load when reaching opposite stability criterion.
Above-mentioned bored concrete pile pile testing method, wherein in the step S6, every grade of load is maintained one hour, by the 5th, 15,
30, pile head settlement amount is read in survey in 60 minutes, and after being offloaded to load and being 0, is surveyed and read the test pile residual settlement amount, survey read time
It is the 5th, 15,30,60 minute, is read later every survey in 30 minutes primary.
Foregoing invention is with the following advantages or beneficial effects:
The invention discloses a kind of bored concrete pile test pile apparatus and its pile testing methods, on the one hand by installing stake on test pile
Cap, and lower cushion block is placed on pile cover to keep vertical pressure balanced, on the other hand pass through jack and concrete test block counterweight
Quantity adjust the size of test load, and it is mixed to support by buttress, intermediate box-girder, edge box-girder, distribution beam
Solidifying soil test block counterweight, to ensure that the safety of jack counterweight platform in jacking or decline, and by being set to test pile
Around multiple displacement sensors obtain the vertical displacement of test pile, to improve the accurate of test pile apparatus settling data
Degree；And the test pile apparatus is suitable for various piles with different diameters, different pressure testing loads, it is versatile；And there is vertical pressure equilibrium, stake
Base settles test data accuracy height, and use is safe, and production and assembling are simple, and installation and dismounting are convenient, and that easily reuses is excellent
Point can be widely used for the bored concrete pile test pile detection activity of building enterprise, it can also be used to which other kinds of pile foundation test has very
Strong practicability.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, the present invention and its feature, outer
Shape and advantage will become more apparent.Identical label indicates identical part in all the attached drawings.Not can according to than
Example draws attached drawing, it is preferred that emphasis is shows the gist of the present invention.
Fig. 1 is the structural schematic diagram of bored concrete pile test pile apparatus in the embodiment of the present invention；
Fig. 2 be test pile in bored concrete pile test pile apparatus in the embodiment of the present invention, buttress, reference stake, supporting beam planar cloth
Set figure.
Fig. 3 is the main view of bored concrete pile test pile apparatus in the embodiment of the present invention；
Fig. 4 is the side view of bored concrete pile test pile apparatus in the embodiment of the present invention；
Wherein: 1 is test pile, and stake on the basis of 2,3 be lower cushion block, and 4 be upper cushion block, and 5 be jack, and 6 be displacement sensor,
7 be intermediate box-girder, and 8 be edge box-girder, and 9 be distribution beam, and 10 be concrete pad, and 11 be supporting beam, and 12 be buttress, and 13 are
Pile cover.
Specific embodiment
The structure in the present invention is further described with specific embodiment with reference to the accompanying drawing, but not as this
The restriction of invention.
Embodiment one
As shown in figures 1-4, the invention discloses a kind of bored concrete pile test pile apparatus, wherein including test pile 1, pile cover 13,
Lower cushion block 3, upper cushion block 4, jack 5, intermediate box-girder 7, edge box-girder 8, distribution beam 9, concrete pad 10, supporting beam
11, buttress 12 and 4 reference stake 2；The pile cover 13 lid be located on test pile 1, lower cushion block 3, jack 5 and upper cushion block 4 according to from
Under supreme sequence be set in turn on pile cover 13, the top of upper cushion block 4 is provided with intermediate box-girder 7, and the intermediate box-girder 7
Bottom correspond to two sides and pass through buttress 12 and connect with ground, which is additionally provided with edge box-girder 8, and
The bottom of the intermediate box-girder 7 and edge box-girder 8 corresponds to two sides and passes through buttress 12 to be connect with ground.And the intermediate box-girder
7 and edge box-girder 8 on be provided with distribution beam 9, and distribution beam 9 and intermediate box-girder 7 and edge box-girder 8 are mutually vertical,
Above-mentioned concrete pad 10 is set in distribution beam 9；4 reference stakes 2 are all set in around test pile 1, on each reference stake 2
It is respectively connected with a supporting beam 11, and supporting beam 11 closes on one end of pile cover 13 and is fixedly installed displacement sensor 6；And each base
The distance of quasi- 2 distance test stake of stake, 1 outer diameter is 1.2~1.6m, and one end of supporting beam 11 is vertical with reference stake 2 to be connect, another
End is connect with displacement sensor 6.
The technical principle of above-mentioned bored concrete pile test pile apparatus is the installation pile cover 13 on test pile 1, and lower cushion block 3 is placed above
It keeps vertical pressure balanced, the size of test load is adjusted by the quantity of jack 5 and concrete block counterweight.By buttress
12, intermediate box-girder, edge box-girder, distribution beam 9 support counterweight, to guarantee that jack 5 is jacking or declining counterweight platform
When safety.
It should be noted that: the upper and lower cushion block 3 of above-mentioned jack 5 need to be pushed up with bottom plate, the pile cover 13 of intermediate box-girder
Portion should fit closely together, to guarantee 1 stress equalization of test pile；Displacement sensor 6 and 5 pressure gauge of jack should not be rushed
Hitting, vibrate etc. influences；And in the present embodiment measuring instrument (such as the pressure gauge being connected with jack 5, it is hereinafter referred to as very heavy
The pressure gauge on top 5) it must be qualified measurement instrument, and used within the re-testing periods.
In a preferred embodiment of the invention, the top of above-mentioned pile cover 13 is plane, and the top of pile cover 13 and ground
Height between face is not less than 400mm.
In a preferred embodiment of the invention, the material of above-mentioned upper cushion block 4 and lower cushion block 3 is steel.
In a preferred embodiment of the invention, the upper surface of above-mentioned concrete test block is provided with hanging ring.
In a preferred embodiment of the invention, it is equipped with inside above-mentioned intermediate box-girder 7 and edge box-girder 8 elongated
Longitudinal cross partition, and box-shaped beam end is all made of diaphragm plate end socket, to increase the bearing capacity and rigidity of box-girder.
The structure of bored concrete pile test pile apparatus in embodiment in order to better understand the present invention, below with reference to specific example
The construction method of bored concrete pile test pile apparatus in the present invention is specifically described:
Specifically, carrying out the place consolidation process around test pile 1 first, test pile 1 is the drill-pouring of diameter 2.2m
Stake need to carry out consolidation process to the place outside 12 outer back gauge at least 1m of buttress, and place reinforcing scope side length is in this example
15mx15m, processing groundwork bearing capacity need to reach 200kPa.
Pile cover 13 is made according to test pile 1, the purpose of pile cover 13 is that the stake top of test pile 1 is avoided to be pressed during pressure testing
Bad, 13 top surface of pile cover is answered smooth, and pile cover 13 should be coaxial with diameter with original pile body, and the concrete strength of pile cover 13 is not less than foundation pile
Concrete strength, and it is not less than C50, pile cover 13 exposes earth surface length and is not less than 400mm, and pile cover 13 bassets in the present embodiment
600mm,
Then in 1 outer diameter 1.4m of distance test stake apart from the interior reference stake 2 for symmetrically making a call to 4 diameters 300mm, deep 3m, benchmark
Stake 2 top surfaces far from ground 90mm, welded at the top of reference stake 2 11,4 ranges of supporting beam that a specification is 10# channel steel be 100mm,
The displacement sensor 6 that precision is 0.01mm is fixed in supporting beam 11, when pile cover 13 is opposite in receiving 5 buffer brake of jack
When vertical displacement occurs for reference stake 2, since vertical displacement does not occur for the fixation of 2 position of reference stake, so being fixed on the support of reference stake 2
Displacement sensor 6 on beam 11 can directly display the vertical displacement distance of pile cover 13.
Continue installation one on pile cover 13 with a thickness of the steel material lower cushion block 3 of 50mm, it is therefore an objective to 5 pedestal counter-force energy of jack
It is balancedly applied on pile cover 13,3 diameter of lower cushion block can be selected according to different stake diameter sizes, and jack is installed in continuation above
Cushion block 4 in 5,50mm thick steel materials pays attention to the center for ensuring upper and lower cushion block 3, the center and 13 center pair of pile cover of jack 5
In.
Continue that 6 buttresses 12 are installed, to support side bar, the weight of center sill and entire clump weight when jack 5 unloads
Amount.Intermediate box-girder 7 is lifted on intermediate buttress 12 and (is located in the middle 2 buttresses 12) later, edge box-girder 8 is lifted
To edge buttress 12 (4 buttresses 12 positioned at two sides) specifically, intermediate box-girder specification is 1000*1000*25*25, edge
Box-girder specification is 1000*600*25*25, and the thick elongated longitudinal cross partition of 25mm, box-shaped beam end are set inside box-girder
Distribution beam 9 is then uniformly distributed on box-girder to increase the bearing capacity and rigidity of box-girder with diaphragm plate end socket, this
9 specification of distribution beam in embodiment is HM440*300*11*18, spacing 500mm, from center to both ends on distribution beam 9
Symmetrical lifting concrete test block, makes abutment pier uniform-compression, and concrete test block specification is 1.5m*0.75m*0.75m in the present embodiment,
Every weight 2000KG, hanging ring is equipped at the top of concrete sample, facilitates the lifting of loop wheel machine, concrete test block after one layer of full paving, on
One layer should be not easy more than 8 layers perpendicular to lower layer's laying, total number of plies, to enhance the stability of concrete weight coating stacking.
Herein, it should be noted that this example is preparation corresponding with the embodiment of bored concrete pile test pile apparatus among the above
Method example, this example can work in coordination implementation with the embodiment of above-mentioned bored concrete pile test pile apparatus.The phase mentioned in the present embodiment
Technical detail is closed to be also applicable in the embodiment of above-mentioned bored concrete pile test pile apparatus.
Embodiment two
The invention discloses a kind of bored concrete pile pile testing method, a kind of bored concrete pile test pile apparatus is (i.e. based on the above embodiment
Utilize a kind of method that disclosed bored concrete pile test pile apparatus carries out test pile of above-described embodiment), specifically, above-mentioned pile testing method includes
Following steps:
Step S1, jack, and after box-girder leaves buttress, read the reading of the pressure gauge of jack.
Step S2 calculates the load that test pile is born according to the reading of the pressure gauge of jack.
Step S3 reads the measurement data of multiple displacement sensors, and is obtained according to the measurement data of multiple displacement sensors
Take the vertical displacement amount of test pile.
In a preferred embodiment of the invention, the vertical displacement amount of above-mentioned test pile is multiple displacement sensors
The average value of measurement data.
Specifically, allowing jack slowly to be jacked first when test pile, intermediate box-girder gradually leaves buttress at this time,
Weight is applied on jack in counterweight platform, calculates top lift at this time by the pressure gauge that jack is connected, this is also
The vertical bearing capacity (i.e. test pile born load) acted on test pile reads jack 4 under different top lifts
The measurement data of displacement sensor, average value are exactly vertical displacement amount of the test pile under different loads.
In a preferred embodiment of the invention, test pile load requires: after every grade of load applies in first hour
The vertical displacement amount (i.e. pile head settlement amount) for reading test pile was surveyed by the 5th, 15,30,45,60 minute, was read later every survey in 30 minutes
Once, and when the test pile rate of settling (i.e. pile head settlement rate) reaches opposite stability criterion it carries out step S4 and (works as test
The stake rate of settling can just apply next stage load when reaching opposite stability criterion), this can be by this field skill with respect to stability criterion
Art personnel are arranged according to process requirements；Specifically, the above-mentioned metastable standard of test pile pile head settlement are as follows: horal stake
It pushes up settling amount and is not more than 0.1mm, and continuously occur twice.
It is to work as following situations occur for the moment that above-mentioned test pile, which terminates loading environment, can terminate load:
1. settling amount of the test pile under certain grade of load action is greater than 5 times of previous stage；
2. settling amount of the test pile under certain grade of load action is greater than 2 times of previous stage, and not yet stable through 24 hours；
3. there is obvious disrepair phenomenon in the ultimate strength or test stake top that have reached pile shaft material；
4. reaching to estimate maximum load amount and settle and reaching relatively stable；
5. test pile total settlement is more than 100mm.
6. then continuing loading when the condition that meets 1., 2. but not up to maximum load amount and reaching to total settlement is met
The requirement of 100mm or more.
Step S4, in continuing stacked concrete test block on concrete test block to reach the next stage loading environment of load.
Step S5 is repeated in step S3~S4, until meeting the condition for terminating loading test.
Step S6, load shedding concrete test block.
Specifically, test pile unloading requires: every grade of load maintains one hour, surveyed by the 5th, 15,30,60 minute and reads test pile
Vertical displacement amount (i.e. pile head settlement amount), and after being offloaded to load and being 0, survey test pile residual settlement amount of reading (i.e. stake top remnants
Settling amount), surveying read time is the 5th, 15,30,60 minute, is read once every survey in 30 minutes later, general to maintain 3 hours.
It is not difficult to find that the present embodiment is embodiment of the method corresponding with the embodiment of bored concrete pile test pile apparatus among the above,
The present embodiment can work in coordination implementation with the embodiment of above-mentioned bored concrete pile test pile apparatus.The embodiment of above-mentioned bored concrete pile test pile apparatus
In the relevant technical details mentioned in the present embodiment still effectively, in order to reduce repetition, which is not described herein again.Correspondingly, originally
The relevant technical details mentioned in embodiment are also applicable in the embodiment of above-mentioned bored concrete pile test pile apparatus.
It should be appreciated by those skilled in the art that those skilled in the art are combining the prior art and above-described embodiment can be with
Realize change case, this will not be repeated here.Such change case does not affect the essence of the present invention, and it will not be described here.
Presently preferred embodiments of the present invention is described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, devices and structures not described in detail herein should be understood as gives reality with the common mode in this field
It applies；Anyone skilled in the art, without departing from the scope of the technical proposal of the invention, all using the disclosure above
Methods and technical content many possible changes and modifications are made to technical solution of the present invention, or be revised as equivalent variations etc.
Embodiment is imitated, this is not affected the essence of the present invention.Therefore, anything that does not depart from the technical scheme of the invention, foundation
Technical spirit of the invention any simple modifications, equivalents, and modifications made to the above embodiment, still fall within the present invention
In the range of technical solution protection.
Claims (10)
1. a kind of bored concrete pile test pile apparatus, which is characterized in that including test pile, pile cover, lower cushion block, upper cushion block, jack, box-shaped
Beam, distribution beam, concrete pad, supporting beam, buttress and multiple reference stakes；
The pile cover lid is located on the test pile, and the lower cushion block, the jack and the upper cushion block are according to from bottom to up
Sequence be set in turn on the pile cover, the top of the upper cushion block is provided with box-girder, and the bottom pair of the box-girder
It answers two sides to pass through the buttress to connect with ground, and is provided with distribution beam on the box-girder, the concrete pad setting
In in the distribution beam；
Multiple reference stakes are all set in around the test pile, and a support is respectively connected on each reference stake
Beam, and the supporting beam closes on one end of the pile cover and is fixedly installed displacement sensor.
2. bored concrete pile test pile apparatus as described in claim 1, which is characterized in that the top of the pile cover is plane, and described
Height between the top and ground of pile cover is not less than 400mm.
3. bored concrete pile test pile apparatus as described in claim 1, which is characterized in that be provided with around the test pile described in 4
Reference stake, and distance of each reference stake apart from the test pile outer diameter is 1.2~1.6m, one end of the supporting beam
Vertical with the reference stake to connect, the other end is connect with institute's displacement sensors.
4. bored concrete pile test pile apparatus as described in claim 1, which is characterized in that described to test pile apparatus includes intermediate box-girder
With the edge box-girder for being located at the intermediate box-girder two sides；
The bottom of the intermediate box-girder and the edge box-girder corresponds to two sides and passes through the buttress to be connect with ground.
5. bored concrete pile test pile apparatus as described in claim 1, which is characterized in that the material of the upper cushion block and the lower cushion block
It is steel.
6. bored concrete pile test pile apparatus as described in claim 1, which is characterized in that the upper surface of the concrete test block is provided with
Hanging ring.
7. a kind of bored concrete pile pile testing method, which is characterized in that based on the bored concrete pile examination as described in claim 1~6 any one
Stake device, the pile testing method include the following steps:
Step S1 jacks the jack, and after the box-girder leaves the buttress, reads the pressure gauge of the jack
Reading；
Step S2 calculates the load that the test pile is born according to the reading of the pressure gauge of the jack；
Step S3 reads the measurement data of multiple institute's displacement sensors, and according to the measurement number of multiple institute's displacement sensors
According to the vertical displacement amount for obtaining the test pile；
Continue stacked concrete test block on step S4, Yu Suoshu concrete test block to reach the next stage loading environment of load；
Step S5 is repeated in the step S3~S4, until meeting the condition for terminating loading test
Step S6, concrete test block described in load shedding.
8. bored concrete pile pile testing method as claimed in claim 7, which is characterized in that in the step S3, the test pile is erected
It is the average value of the measurement data of multiple institute's displacement sensors to displacement.
9. bored concrete pile pile testing method as claimed in claim 7, which is characterized in that in the pile testing method, applied in every grade of load
Add the vertical displacement amount surveyed in latter first hour by the 5th, 15,30,45,60 minute and read the test pile, later every 30 minutes
It surveys and reads once, and apply next stage load when the test pile rate of settling reaches opposite stability criterion.
10. bored concrete pile pile testing method as claimed in claim 7, which is characterized in that in the step S6, every grade of load is maintained
One hour, pile head settlement amount is read by survey in the 5th, 15,30,60 minute, and after being offloaded to load and being 0, it is residual to survey the reading test pile
Remaining settling amount, surveying read time is the 5th, 15,30,60 minute, is read later every survey in 30 minutes primary.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110847257A (en) * | 2019-12-11 | 2020-02-28 | 台州学院 | Pile foundation static load experiment device and method suitable for narrow space |
| CN114086590A (en) * | 2021-11-15 | 2022-02-25 | 国网安徽省电力有限公司经济技术研究院 | Pre-reinforcing device for repairing pile foundation of transmission terminal tower and construction method thereof |
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