CN107642112A - A kind of end open type PHC pile tube end resistance test devices - Google Patents
A kind of end open type PHC pile tube end resistance test devices Download PDFInfo
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- CN107642112A CN107642112A CN201710941912.2A CN201710941912A CN107642112A CN 107642112 A CN107642112 A CN 107642112A CN 201710941912 A CN201710941912 A CN 201710941912A CN 107642112 A CN107642112 A CN 107642112A
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Abstract
The invention belongs to ground foundation engineering technical field, is related to a kind of end open type PHC pile tube end resistance test devices, and base steel plate welds together with the annular steel plate at pipe pile end；Sensor embedded hole and traction grooved are reserved on base steel plate；Temperature self-compensation type fiber grating earth pressure sensor is arranged in sensor embedded hole, the bottom surface and side of temperature self-compensation type fiber grating earth pressure sensor are closely pasted with anchoring adhesive with pile tube, armored optical cable is drilled through pile body first from the inboard wall groove of pile tube by the traction grooved on base steel plate and introduces the unit with grooves in outer wall of pile tube, and then drill to draw from the inside of pile tube through pile body second is connected with fiber grating analyzer；Its is simple in construction, install convenient, easy to operate, low cost, is hardly damaged, and measuring accuracy is high, workable, can be monitored in real time and long term monitoring, is widely used, can also be applied to other kinds of prefabricated pile.
Description
Technical field：
The invention belongs to ground foundation engineering technical field, is related to a kind of test equipment of prefabricated pile end resistance, especially
It is a kind of end open type PHC (prestressed high strength concrete, PrestressHighConcrete) pile tube end resistance test
Device.
Background technology：
Pile foundation is a kind of time-honored base form, while is also a kind of using quite varied building foundation shape
Formula.With the acceleration of urbanization process, construction scope continues to increase, building structure increasingly " high, precision and frontier ", in addition soil layer feelings
Condition is complicated, and the requirement to building basis is more and more harsher.End open type PHC pile tubes as a kind of pile-type in pile foundation,
Pile crown need not be made, there is high capacity, steady quality, the spy such as speed of application is fast, pollution-free, noise is low, construction costs is low
Point, it is well suited for using in urban district and other coastal soft clay areas conditional to noise.At present, the application amount of prefabricated pile and day are all
Increase, considerably beyond its theoretical and experimental study, which increase uncertainty of the prefabricated pile in practical engineering application.Building
Basis needs to meet deformation and the requirement of bearing capacity simultaneously, and the bearing capacity of stake is divided into two parts pile side friction and end resistance,
For Piles for Friction Piles, the ratio that end resistance accounts for total bearing capacity is much smaller compared to pile side friction, but holds type stake for end
For by chance on the contrary, for end resistance, it is the important component of pile bearing capacity, always by domestic and foreign scholars and engineering
Technical staff is paid attention to.Due to construction method of the end resistance by stake, the characteristic through soil layer and supporting course, into holding force layer depth
Degree, stake the factor such as size influence so that pile-end soil body interacts with stake becomes sufficiently complex, although being used for end resistance
The method of determination has a lot, but due in end resistance problem there is too many uncertainty, to the field no matter from reason
Still need to do extensive work by upper still put into practice in accumulation and experimental study of research.Sometimes, when larger sedimentation occurs for basis, stake end
Resistance just gives full play to, but this has not met requirement of the building to sedimentation.Therefore, it is necessary to take a kind of new scene survey
Method for testing rapidly and accurately determines end resistance, on the one hand can make up the deficiency of existing measuring technology, Chinese patent
201310500315.8 disclosing a kind of prestressed high-strength concrete pile end resistance test device, belong to resistance measurement equipment skill
Art field, experimental rig strengthen steel plate, steel pile casting, axle power meter, ribbed stiffener, bolt, shielded conductor and type vibration wire frequency by three
Readout instrument form, the experimental rig can realize to using static pressure construction pile for prestressed pipe test end resistance, solve due to
The difficulty of end resistance is determined caused by pile-soil interaction is sufficiently complex.But existing test device fails to reflect that pile tube is true
Construction effect, soil plug effect and the end resistance that is provided of wall thickness are merged, and institute's peg end resistance is more than actual value；It is another
Aspect also can be that correlative study is accumulated experience and laid the foundation.
The content of the invention：
Present invention aims to overcome that the shortcomings that prior art is present, is retaining original opening concrete pipe pile construction effect
On the premise of, optimization and raising end resistance measuring accuracy, there is provided a kind of open using the end of static pressure method or hammer-impact construction
Type PHC pile tube end resistance test devices, temperature self-compensation type fiber grating earth pressure sensor is installed at stake end, utilizes optical fiber
Grating demodulation instrument measures fiber bragg grating center wavelength variable quantity, and end resistance is then calculated.
To achieve these goals, the body junction of end open type PHC pile tube end resistance test devices of the present invention
Structure include pile tube, base steel plate, temperature self-compensation type fiber grating earth pressure sensor, armored optical cable, fiber grating analyzer,
Traction grooved, inboard wall groove, pile body first drills, unit with grooves in outer wall, pile body second drills, bump joint, pile extension weld seam and sensor
Embedded hole, pile tube are end open type PHC pile tubes；In cirque structure, the base steel plate inner and outer diameter and pile tube that thickness is 3cm
Overall diameter is identical, and base steel plate welds together with the annular steel plate carried at pipe pile end；Two are reserved on base steel plate
The sensor embedded hole being arranged symmetrically, the diameter of sensor embedded hole are more than temperature self-compensation type optical fiber grating soil pressure sensing
Device, be reserved with base steel plate be connected with sensor embedded hole, the traction grooved that width is 5mm；Temperature self-compensation type fiber grating
Soil pressure sensor is arranged in the sensor embedded hole reserved on base steel plate, and temperature self-compensation type optical fiber grating soil pressure passes
The bottom surface and side of sensor are closely pasted with anchoring adhesive with pile tube, ensure that temperature self-compensation type fiber grating earth pressure sensor is convex
Go out base steel plate so that temperature self-compensation type fiber grating earth pressure sensor and pile tube, base steel plate are into being integral；Temperature
The lead of self-compensation type fiber grating earth pressure sensor is protected with armored optical cable；It is recessed that inwall is had on the inside and outside wall of pile tube
Groove and unit with grooves in outer wall, the stake end of pile tube are provided with pile body first and drilled, and stake top is provided with pile body second and drilled, and armored optical cable passes through base
Traction grooved on steel plate drills from the inboard wall groove of pile tube through pile body first introduces the unit with grooves in outer wall of pile tube, then through pile body second
Drill to draw from the inside of pile tube and be connected with fiber grating analyzer, traction grooved, inboard wall groove, pile body first drills, outer wall is recessed
Armored optical cable in groove, the drilling of pile body second is encapsulated using structure glue；Base steel plate prevent pile tube in work progress temperature from
Compensation fiber grating earth pressure sensor comes off or is damaged, and ensures that temperature self-compensation type fiber grating earth pressure sensor is uniform
Stress, temperature self-compensation type fiber grating earth pressure sensor can influence of the automatic rejection temperature change to test result, because
This, without the concern for temperature-compensating when this experimental rig is tested；When the length of one root canal pile is inadequate, drilled from pile body first
In pass the armored optical cable with bump joint, drawn during the pile body second of armored optical cable and another root canal pile is drilled same
Armored optical cable connection with bump joint, and two root canal piles are formed into pile extension weld seam along the welding alignment of tubular pile hoop plate periphery.
The present invention realizes the detailed process of end open type PHC pile tubes end resistance test：
(1) the base steel plate processed and the annular end plate at pipe pile end are welded together, its center base steel plate
At stake end nearly inside edge reserve sensor embedded hole (diameter is slightly larger than temperature self-compensation type fiber grating earth pressure sensor,
Depth is slightly less than the thickness of temperature self-compensation type fiber grating earth pressure sensor) and width 5mm traction grooved；Along stake outer wall side
The pre-embossed width 5mm in surface unit with grooves in outer wall, drilled with electric drill to form pile body second and drill and pile body in the stake top of pile tube and stake end
First drilling, and reserve width 5mm inboard wall groove in stake end inwall；
(2) temperature self-compensation type fiber grating earth pressure sensor is put into sensor embedded hole, armored optical cable edge is led
Approaching channel and inboard wall groove are passed again inside pile tube along pile body groove fair line, are finally drawn from the drilling of pile body second and whole process is faced
When fix, then inboard wall groove, unit with grooves in outer wall, pile body second drill and pile body first drill in pour into anchoring adhesive encapsulation, now
Ensure that temperature self-compensation type fiber grating earth pressure sensor is flushed with pipe pile end soil contact face to reflect stake end and ground
Interaction；
(3) after bar planting adhesive curing 2 hours, the armored optical cable that pile tube is drawn is connected with fiber grating analyzer, a side
Face checks whether test device connection intact, on the other hand check temperature self-compensation type fiber grating earth pressure sensor whether by
Damage；The temperature self-compensation type optical fiber grating soil pressure that the positioning of measurement installation in time is completed before using static pressure or hammering construction
The initial value of sensor, then basis《Technical code for building pile foundation》(JGJ94-2008) specific requirement is constructed, construction
During perform construction note and data storage, and protect tester in use；
(4) if the length of a root canal pile does not reach the depth of design code, pile extension processing is carried out, now upper section stake needs
Armored optical cable is finished along pile body encapsulation in advance, and the armored optical cable with bump joint is passed from the drilling of pile body first, will
It is connected with the armored optical cable again with bump joint drawn from the drilling of jacked pile pile body second, it is ensured that upper lower flange
Connect well, upper and lower two section stakes are welded along tubular pile hoop version periphery and alignd, ensures welding quality, is utilized after the completion of above-mentioned work
Static pressure or the construction method of hammering continue injection until reaching the pile sinking control condition of design requirement.
The present invention to temperature self-compensation type optical fiber grating soil pressure sensing before use, demarcate, in use, temperature is self-complementary
The exterior normal for repaying formula fiber grating earth pressure sensor pressure-bearing surface is conllinear with ground contact surface exterior normal, it is ensured that the stress shape of pile tube
State is normally delivered to an end rock-soil layer by temperature self-compensation type fiber grating earth pressure sensor, after device installation in time
Measure initial value；In the work progress of pile tube, using fiber grating analyzer read data, according to the parameter index of device,
Data and formula (1) Δ λ of readingB=KεΔεx, formula (2) Qpk=E Δs εxΑpEnd resistance is calculated, wherein, Δ λBFor
Center wavelength variation amount, unit nm；KεFor strain transducer sensitivity coefficient；ΔεxFor axial strain variable quantity；QpkFor end bearing
Power, unit kN；E is pile tube modulus of elasticity, units MPa；ΑpFor pipe pile end area, unit mm2。
Compared with prior art, its is simple in construction, install convenient, easy to operate, low cost, is hardly damaged by the present invention, surveys
It is high to try precision, it is workable, it can in real time be monitored and long term monitoring, be widely used, can also be applied to other kinds of
Prefabricated pile.
Brief description of the drawings：
Fig. 1 is the agent structure principle schematic of end open type PHC pile tube end resistance test devices of the present invention.
Fig. 2 is tubular pile splicing principle schematic of the present invention.
Fig. 3 is pipe pile end structure principle schematic of the present invention.
Fig. 4 is the test result of wherein one test pile described in the embodiment of the present invention.
Fig. 5 is the test result of an other test pile described in the embodiment of the present invention.
Embodiment：
The invention will be further described by way of example and in conjunction with the accompanying drawings.
Embodiment：
The agent structure of end open type PHC pile tube end resistance test devices described in the present embodiment includes pile tube 1, base
It is steel plate 2, temperature self-compensation type fiber grating earth pressure sensor 3, armored optical cable 4, fiber grating analyzer 5, traction grooved 6, interior
Wall groove 7, the drilling of pile body first 8, unit with grooves in outer wall 9, the drilling of pile body second 10, bump joint 11, pile extension weld seam 12 and sensor
Embedded hole 13, pile tube 1 are end open type PHC pile tubes；Cirque structure, the inner and outer diameter of base steel plate 2 that thickness is 3cm and pipe
1 inner and outer diameter of stake is identical, and the annular steel plate carried at 1 end of base steel plate 2 and pile tube welds together；On base steel plate 2
Two sensor embedded holes 13 being arranged symmetrically are reserved, the diameter of sensor embedded hole 13 is slightly larger than temperature self-compensation type optical fiber light
Grid soil pressure sensor 3, be reserved with base steel plate 2 be connected with sensor embedded hole 13, the traction grooved 6 that width is 5mm；Temperature
Self-compensation type fiber grating earth pressure sensor 3 is arranged in the sensor embedded hole 13 reserved on base steel plate 2, and temperature is self-complementary
The bottom surface and side for repaying formula fiber grating earth pressure sensor 3 are closely pasted with anchoring adhesive and pile tube 1, ensure temperature self-compensation type
The dimpling of fiber grating earth pressure sensor 3 goes out base steel plate 2 so that temperature self-compensation type fiber grating earth pressure sensor 3 with
Pile tube 1, base steel plate 2 are into being integral；The lead of temperature self-compensation type fiber grating earth pressure sensor 3 armored optical cable 4
Protection；Inboard wall groove 7 and unit with grooves in outer wall 9 are had on the inside and outside wall of pile tube 1, the stake end of pile tube 1 is provided with pile body first and drilled
8, stake top is provided with the drilling of pile body second 10, inboard wall groove 7 of the armored optical cable 4 by the traction grooved 6 on base steel plate 2 from pile tube 1
The unit with grooves in outer wall 9 of pile tubes 1 is introduced through the drilling of pile body first 8, is then drawn from the inside of pile tube 1 through the drilling of pile body second 10 and light
Fine grating analysis instrument 5 connects, traction grooved 6, inboard wall groove 7, pile body first drilling 8, unit with grooves in outer wall 9, pile body second drilling 10 in
Armored optical cable 4 using structure glue encapsulate；Base steel plate 2 prevents the temperature self-compensation type fiber grating in work progress of pile tube 1
Soil pressure sensor 3 comes off or is damaged, and ensures the uniform stressed of temperature self-compensation type fiber grating earth pressure sensor 3, temperature is certainly
Compensation fiber grating earth pressure sensor 3 can influence of the automatic rejection temperature change to test result, therefore, this experiment side
Method is without the concern for temperature-compensating；When the length of one root canal pile 1 is inadequate, passed from the drilling of pile body first 8 with bump joint
11 armored optical cable 4, the pile body second of armored optical cable 4 and another root canal pile 1 is drilled being connect again with flange of drawing in 10
First 11 armored optical cable 4 is connected, and two root canal piles are formed into pile extension weld seam 12 along the welding alignment of tubular pile hoop plate periphery.
The present embodiment realizes the detailed process of end open type PHC pile tubes end resistance test：
(1) the annular end plate at 1 end of the base steel plate 2 processed and pile tube is welded together, its center base steel
In the reserved sensor embedded hole 13 of the nearly inside edge in stake end, (diameter passes plate 2 slightly larger than temperature self-compensation type optical fiber grating soil pressure
Sensor 3, depth are slightly less than the thickness of temperature self-compensation type fiber grating earth pressure sensor 3) and width 5mm traction grooved 6；Edge
The stake outer wall pre-embossed width 5mm in side surface unit with grooves in outer wall 9, is drilled to form pile body second in the stake top of pile tube 1 and stake end with electric drill
Drilling 10 and the drilling of pile body first 8, and reserve width 5mm inboard wall groove 7 in stake end inwall；
(2) temperature self-compensation type fiber grating earth pressure sensor 3 is put into sensor embedded hole 13, armored optical cable 4
Pass inside pile tube again along the fair line of pile body groove 9 along traction grooved 6 and inboard wall groove 7, finally draw from the drilling of pile body second 10
Go out and whole interim fixed, then poured into inboard wall groove 7, unit with grooves in outer wall 9, the drilling of pile body second 10 and the drilling of pile body first 8
Anchoring adhesive encapsulates, and now to ensure that temperature self-compensation type fiber grating earth pressure sensor 3 flushes with pipe pile end soil contact face
To reflect the interaction at stake end and ground；
(3) after bar planting adhesive curing 2 hours, the armored optical cable 4 that pile tube 1 is drawn is connected with fiber grating analyzer 5, one
Aspect checks whether test device connection is intact, on the other hand checks that temperature self-compensation type fiber grating earth pressure sensor 3 is
It is no to be damaged；The temperature self-compensation type fiber grating soil that the positioning of measurement installation in time is completed before using static pressure or hammering construction
The initial value of pressure sensor 3, then basis《Technical code for building pile foundation》(JGJ94-2008) specific requirement is constructed,
Construction note and data storage are performed in work progress, and protects tester in use；
(4) if the length of a root canal pile does not reach the depth of design code, pile extension processing is carried out, now upper section stake needs
Armored optical cable is finished along pile body encapsulation in advance, and the armored optical cable with bump joint 11 is passed from the drilling of pile body first 8
4, it is connected with the armored optical cable 4 again with bump joint 11 drawn in 10 that drilled from jacked pile pile body second, really
Lower flange is connected good on guarantor, and upper and lower two section stakes are welded along tubular pile hoop version periphery and alignd, ensure welding quality, above-mentioned work
After the completion of utilize static pressure or the construction method of hammering to continue injection until reaching the pile sinking control condition of design requirement.
The test pile of the present embodiment is PHC-AB400 types end open type prestressed concrete pipe pile, wall thickness 95mm, and stake is long
23m, tested respectively using two test piles under test site as shown in table 1, test result is respectively such as Fig. 4 and Fig. 5 institutes
Show.
Table 1：Test site geological condition
Claims (3)
1. a kind of end open type PHC pile tube end resistance test devices, it is characterised in that agent structure includes pile tube, base steel
Plate, temperature self-compensation type fiber grating earth pressure sensor, armored optical cable, fiber grating analyzer, traction grooved, inboard wall groove,
Pile body first drills, unit with grooves in outer wall, pile body second drills, bump joint, pile extension weld seam and sensor embedded hole, pile tube are end
Open type PHC pile tubes；Cirque structure, the base steel plate inner and outer diameter that thickness is 3cm are identical with pile tube inner and outer diameter, base steel
Plate welds together with the annular steel plate carried at pipe pile end；It is embedding that two sensors being arranged symmetrically are reserved on base steel plate
Enter hole, the diameter of sensor embedded hole is more than temperature self-compensation type fiber grating earth pressure sensor, is reserved with base steel plate
It is connected with sensor embedded hole, the traction grooved that width is 5mm；Temperature self-compensation type fiber grating earth pressure sensor is arranged on bottom
In the sensor embedded hole reserved on seat steel plate, the bottom surface of temperature self-compensation type fiber grating earth pressure sensor and side are planted
Muscle glue is closely pasted with pile tube, ensures temperature self-compensation type fiber grating earth pressure sensor protrusion base steel plate so that temperature
Self-compensation type fiber grating earth pressure sensor and pile tube, base steel plate are into being integral；Temperature self-compensation type fiber grating soil
The lead of pressure sensor is protected with armored optical cable；Inboard wall groove and unit with grooves in outer wall, pile tube are had on the inside and outside wall of pile tube
Stake end be provided with pile body first and drill, stake top is provided with pile body second and drilled, armored optical cable by the traction grooved on base steel plate from
The inboard wall groove of pile tube drills through pile body first introduces the unit with grooves in outer wall of pile tube, is then drilled through pile body second from the inside of pile tube
Extraction is connected with fiber grating analyzer, and it is interior that traction grooved, inboard wall groove, pile body first drills, unit with grooves in outer wall, pile body second drills
Armored optical cable using structure glue encapsulate；Base steel plate prevents pile tube temperature self-compensation type fiber grating soil pressure in work progress
Force snesor comes off or is damaged, and ensures temperature self-compensation type fiber grating earth pressure sensor uniform stressed, temperature self-compensation type
Fiber grating earth pressure sensor being capable of influence of the automatic rejection temperature change to test result；The length of one root canal pile is inadequate
When, the armored optical cable with bump joint is passed from the drilling of pile body first, by the pile body of armored optical cable and another root canal pile the
The armored optical cable again with bump joint drawn in two drillings is connected, and two root canal piles are welded along tubular pile hoop plate periphery
Alignment forms pile extension weld seam.
2. end open type PHC pile tubes end resistance test device according to claim 1, it is characterised in that the device uses
Before, temperature self-compensation type optical fiber grating soil pressure sensing is demarcated, in use, temperature self-compensation type optical fiber grating soil pressure
The exterior normal of sensor pressure-bearing surface is conllinear with ground contact surface exterior normal, it is ensured that the stress of pile tube passes through temperature self-compensation type
Fiber grating earth pressure sensor is normally delivered to an end rock-soil layer, measures initial value after device installation in time；In pile tube
Work progress in, using fiber grating analyzer read data, according to the parameter index of device, read data and formula
(1)ΔλB=KεΔεx, formula (2) Qpk=E Δs εxΑpEnd resistance is calculated, wherein, Δ λBCentered on wavelength variable quantity,
Unit nm；KεFor strain transducer sensitivity coefficient；ΔεxFor axial strain variable quantity；QpkFor end resistance, unit kN；E is pipe
Stake modulus of elasticity, units MPa；ΑpFor pipe pile end area, unit mm2。
3. end open type PHC pile tubes end resistance test device according to claim 2, it is characterised in that using the device
Realize the detailed process of end open type PHC pile tubes end resistance test：
(1) the base steel plate processed and the annular end plate at pipe pile end are welded together, its center base steel plate is in stake
Nearly inside edge is held to reserve sensor embedded hole and width 5mm traction grooved；Along the pre-embossed width 5mm in stake outer wall side surface outer wall
Groove, drilled with electric drill to form the drilling of pile body second and pile body first drills in the stake top of pile tube and stake end, and in stake end inwall
Reserved width 5mm inboard wall groove；
(2) temperature self-compensation type fiber grating earth pressure sensor is put into sensor embedded hole, armored optical cable is along traction grooved
Passed again along pile body groove fair line inside pile tube with inboard wall groove, finally drawn from the drilling of pile body second and whole process is interim solid
It is fixed, then anchoring adhesive encapsulation is poured into inboard wall groove, unit with grooves in outer wall, pile body second drill and pile body first drills, now to protect
Card temperature self-compensation type fiber grating earth pressure sensor is flushed with pipe pile end soil contact face to reflect the phase at stake end and ground
Interaction；
(3) after bar planting adhesive curing 2 hours, the armored optical cable that pile tube is drawn is connected with fiber grating analyzer, on the one hand examined
Whether intact look into test device connection, on the other hand check whether temperature self-compensation type fiber grating earth pressure sensor is damaged
It is bad；The temperature self-compensation type optical fiber grating soil pressure that the positioning of measurement installation in time is completed before using static pressure or hammering construction passes
The initial value of sensor, then basis《Technical code for building pile foundation》(JGJ94-2008) specific requirement is constructed, and is constructed
Construction note and data storage are performed in journey, and protects tester in use；
(4) if the length of a root canal pile does not reach the depth of design code, pile extension processing is carried out, now upper section stake need to shift to an earlier date
By armored optical cable along pile body encapsulation finish, and from pile body first drilling in pass the armored optical cable with bump joint, by its with
The armored optical cable again with bump joint drawn from the drilling of jacked pile pile body second is connected, it is ensured that upper lower flange is connected
Well, upper and lower two section stakes are welded along tubular pile hoop version periphery and alignd, ensured welding quality, static pressure is utilized after the completion of above-mentioned work
Or the construction method of hammering continues injection until reaching the pile sinking control condition of design requirement.
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| CN201710941912.2A CN107642112A (en) | 2017-09-30 | 2017-09-30 | A kind of end open type PHC pile tube end resistance test devices |
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| CN201710941912.2A CN107642112A (en) | 2017-09-30 | 2017-09-30 | A kind of end open type PHC pile tube end resistance test devices |
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