CN107806116A - A kind of miniature uplift pile anti-pulling capacity method of testing of fiber bar - Google Patents
A kind of miniature uplift pile anti-pulling capacity method of testing of fiber bar Download PDFInfo
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- CN107806116A CN107806116A CN201710923364.0A CN201710923364A CN107806116A CN 107806116 A CN107806116 A CN 107806116A CN 201710923364 A CN201710923364 A CN 201710923364A CN 107806116 A CN107806116 A CN 107806116A
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- fiber bar
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- uplift pile
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
The present invention relates to foundation technical field, it is related to a kind of miniature uplift pile anti-pulling capacity method of testing of fiber bar, the miniature uplift pile anti-pulling capacity test device of fiber bar is first installed, buttress is symmetrically put in the miniature uplift pile both sides of fiber bar, datum line beam is arranged on buttress, then magnetic stand and displacement transducer are installed in datum line beam, wherein displacement transducer is symmetrically installed on the miniature uplift pile stake top of fiber bar, load sensor is connected on external Acquisition Instrument, jack is closely coupled by supporting high-pressure oil pipe and supporting high-pressure oil pump and separating valve, precharge checks load sensor, whether displacement transducer and loading device are working properly, until the reading of load sensor starts the amount of pulling out on the miniature uplift pile anti-pulling capacity of test data sheet fiber bar and pile body after reaching 5kN；Installation is simple, workable, security reliability is high, device is hardly damaged, reusable, cost is low, can obtain bigger anti-pulling capacity.
Description
Technical field：
The present invention relates to foundation technical field, is related to a kind of miniature uplift pile anti-pulling capacity test side of fiber bar
Method, non-metallic fibers muscle is applied to miniature uplift pile instead of traditional reinforcing bar, meanwhile, with special more advanced pull-out test
Device carries out anti-pulling capacity experiment to the miniature uplift pile of fiber bar (90~400mm of diameter), measures the displacement in drawing process
And bearing capacity, its deformation characteristic and load-carrying properties to be studied, the test method strong operability, experimental rig is simply accurate,
Cost is relatively low.
Background technology：
With the propulsion of urbanization process, buildings or structures moulding is more complicated, the number of plies is higher, causes buildings or structures basic
Buried depth is bigger, and influence of the underground water to construction of structures is bigger, and anti-floating problem is more prominent.Therefore, the measure of anti float of high-efficiency high-quality
The security of structure is particularly important.Miniature uplift pile is the mortar using mini pile pulling force and mini pile integration
Stratum consolidation is formed globality earth formation so as to play a kind of stake of anti-floating effect by (pea gravel concreten) anchoring body.It is miniature
Uplift pile has ground adaptability strong, arranges shape compared to measure of anti float such as drop row underground water, ballast method, large diameter anti-float piles
Formula is flexible, speed of application is fast and it is green the advantages that, it is especially with the obvious advantage in hard rock-soil layer, such as in hard rock
The uplift pile for major diameter of being constructed in stone, more difficult and engineering cost of constructing are high.
At present, reinforcing bar is one of main composition material of miniature uplift pile, because of its Cl in by underground waterˉ、SO4 2-Plasma
Chemical attack, so as to influence the load-carrying properties of miniature uplift pile and durability, this influence is in coastal area buildings or structures
It is more prominent in base application；In addition, found in subway construction project, because direct current can be right for system electricity generation stray electrical current
Reinforcing bar produces more serious electrochemical corrosion, substantially reduces the service life of float Structure.Thus miniature uplift pile in engineering
Anticorrosion Problems become particularly significant, in Practical Project, it will usually according to the design life of uplift pile and residing
The environment category of layer determines armored concrete uplift pile anti-corrosion protection grade and precautionary measures.But found after practical application, often
The miniature uplift pile of rule can not fundamentally solve the etching problem of pile body reinforcing bar.GFRP(Glass Fiber Reinforced
Polymer, fiberglass reinforced plastics) material has tensile strength height, light weight, an anticorrosive, electromagnetism interference, and and other
Fiber-reinforced polymer is low compared to having price, cost-effective, the advantages that being widely used, is applied the energy in miniature uplift pile
Solve the endurance issues of stake, be the innovation and breakthrough to present situation engineering technology.But the fiber bar in this miniature uplift pile exists
Be under load action how cooperative bearing, and be how during pull-out test and loading test to realize quick anchoring again
And provide the not related open report of reliable anchor force.Therefore, it is miniature anti-there is an urgent need to seek to design a kind of fiber bar
Pile pulling anti-pulling capacity method of testing, this method verify such fiber bar type stake anti-floating for solving the durability of float Structure
Micro- bearing capacity, determine that it deforms limitation and requires highly important Social benefit and economic benefit.
The content of the invention：
The shortcomings that it is an object of the invention to overcome prior art to exist, seek to design a kind of miniature uplift pile of fiber bar and resist
Bearing capacity test method is pulled out, substitutes traditional reinforcing bar using non-metallic fibers muscle to form new miniature uplift pile,
And for its special design anti-pulling capacity experimental rig, the popularization and application for such miniature uplift pile provide foundation, and its is operable
Property is strong, and test data is accurate, and cost is relatively low, there is preferable dissemination.
To achieve these goals, the present invention is realized using the miniature uplift pile anti-pulling capacity test device of fiber bar, its
Detailed process is：
(1) uplift pile fiber bar cage is made, fiber bar is first passed through into tie hoop one by one, then with tied silk by fiber
Muscle banding fixed forms uplift pile fiber bar cage, fiber bar and the respective spacing of stirrup and diameter need to meet on tie hoop
Existing specification and design requirement；
(2) by after levelling of the land, first both drilled with down-the-hole drill in fixed pile, forming stake holes and check the aperture of stake holes
And hole depth, then the lifting of uplift pile fiber bar cage is transferred in stake holes, ensure that fiber bar cage is located at stake holes center, and with enough
Protective layer thickness, then casting concrete (intensity of concrete should meet design requirement) from bottom to top, smear after vibration compacting
Flat stake top, concrete test block is made with the conditions of, and whether the intensity for detecting concrete test block meets to require；
(3) after conserving 28 days, loading device is installed, first in the miniature lateral extent pile center at least 50cm of uplift pile two of fiber bar
Position lay 5cm thickness sand bedding course and levelling respectively, ensure that its compactness and rigidity can support top loading device enough, will not
Sedimentation is produced in loading procedure, is then sequentially placed jack pad, jack, the 3rd steel pad from bottom to top in the position
Plate, beam stool and reaction beam, while will be enlarged by head height and hale pulling out screw rod and passing through reaction beam, on the high-strength drawing screw rod of enlarged footing successively
Second billet, load sensor, the first billet, high-strength nut are laid through the high-strength drawing screw tip of enlarged footing, rotation
Turn the position of the high-strength nut regulation high-strength drawing screw rod bottom enlarged footing of enlarged footing, now, will on the ground with fiber bar tapered end
Overhanging fiber bar is fixed on the reserving hole position of the high-strength drawing screw rod bottom enlarged footing of enlarged footing in a manner of screw thread couple, most
High-strength nut is tightened with torque spanner afterwards, to ensure that the high-strength drawing screw rod bottom enlarged footing of enlarged footing is horizontal in whole installation process
And fiber bar uniform stressed, and enlarged footing high-strength bolt, the first billet, load sensor, the second billet and reaction beam
The centre of form on the same line, make a concerted effort center line and the cross section centre of form axle weight of the miniature uplift pile of fiber bar of two jack
Close, so that the miniature uplift pile uniaxial force of fiber bar；
(4) bearingtest of the miniature uplift pile of fiber bar is carried out, branch is symmetrically put in the miniature uplift pile both sides of fiber bar
Pier, datum line beam are arranged on buttress, then install magnetic stand in datum line beam and displacement transducer, wherein displacement transducer are symmetrical
Be arranged on the miniature uplift pile stake top of fiber bar, in addition to ensuring datum line beam, displacement transducer and not shaking, test device will also
Meet《Architecture foundation pile inspection specifications》(JGJ106-2014) requirement, load sensor is connected to external Acquisition Instrument
On, jack is closely coupled by supporting high-pressure oil pipe and supporting high-pressure oil pump and separating valve, and precharge checks that loading passes
Whether sensor, displacement transducer and loading device are working properly, until the reading of load sensor reaches 5kN, it was demonstrated that loading dress
Put and contacted the amount of pulling out on the miniature uplift pile anti-pulling capacity of close rear beginning test data sheet fiber bar and pile body.
It is high-strength that the agent structure of the miniature uplift pile anti-pulling capacity experimental rig of fiber bar of the present invention includes enlarged footing
Drawing screw rod, high-strength nut, the first billet, load sensor, the second billet, reaction beam, the 3rd billet, beam stool, thousand
Jin top, jack pad, fiber bar tapered end, fiber bar, stirrup, stake holes, displacement transducer, magnetic stand, datum line beam and buttress；
The high-strength drawing screw rod of enlarged footing is the rigid solid structure that is made up of screw rod shaft and bottom enlarged footing, the diameter of screw rod shaft by
The bearing capacity of miniature uplift pile is defined as 60~80mm, and enlarged footing is in the form of annular discs, and thickness 50mm, edge is formed with some holes,
Hole diameter determines by the diameter of fiber bar, is available for fiber bar through installation, and empty quantity is according to being actually needed determination；Hexagon
The high-strength nut of cylindrical structure is connected to the outer surface of enlarged footing high-strength bolt in a manner of screw thread couple, multiple to be used in series
To provide enough counter-forces；The length of side of first billet of square structure is 20cm, thickness 3cm, and center is formed with hole, the hole
Hole dia is more than the diameter of enlarged footing high-strength bolt, and the first billet top is connected with high-strength nut, lower end and load sensor
It is connected；Load sensor is punching structure, and the load of application, loading sensing are intuitively shown by external supporting digital indicator
Device bottom is connected with the second billet；The second billet length of side of square structure is 30cm × 30cm, thickness 3cm, center system
Hole, its hole diameter are slightly larger than the diameter of enlarged footing high-strength bolt, and the bottom of the second billet is connected with reaction beam；Counter-force
Beam is welded into box structure using thickness 3cm steel plate, and its span is 1.8m, a width of 30cm, a height of 60cm, and reaction beam is along span
Direction sets a number of longitudinal stiffener, and the quantity of longitudinal stiffener is according to being actually needed determination, it is ensured that reaction beam has foot
Enough rigidity and stability, UNICOM's hole is reserved with the upper lower flange of span centre reaction beam, and hole diameter will be easy to expand head height
Strong screw rod screw rod shaft passes freely through；Jack pad is symmetrically disposed at the both sides of stake holes, is not less than with the distance at stake holes edge
50cm, to avoid experimental rig sedimentation is excessive from causing test data inaccurate；The bottom of jack is arranged in jack pad
Centre, the 3rd billet is close at top, and positioned at the 3rd billet center, two jack are model of the same race, and can provide foot
Enough pulling capacities, jack is connected with its supporting high-pressure oil pump, separating valve with high-pressure oil pipe during drawing, realizes synchronization of jacking up
Reaction beam；The structure of 3rd billet is identical with the second billet, and the 3rd billet is placed in into jack and reaction beam during use
Between；Beam stool is the cuboid opening lattice configured construction that shaped steel is welded into, and a length of 40cm, a width of 30cm, a height of 40cm, ensures it
The high-pressure oil pipe being connected with jack that side is set can be passed freely through, and beam stool is placed on jack pad, the 3rd steel pad
Plate and jack are respectively positioned on inside beam stool；The jack pad length of side of square structure is 50cm, thickness 3cm, its bottom surface and ground
The levelling sand bedding course that face is laid in advance is connected；Fiber bar and stirrup are fiberglass reinforced plastics (GFRP) full thread solid hopkinson bar
Shape structure, for the cohesion of reinforcing fiber muscle and concrete, stirrup in the shape of a spiral, is used together carefully with fiber bar in stake holes
Steel wire lashing connects to form uplift pile fiber bar cage；Passed through in stake holes outer fiber muscle pre- on the high-strength drawing screw rod enlarged footing of enlarged footing
The circular hole stayed, fiber bar tapered end is anchored on the high-strength drawing screw rod of enlarged footing with fiber bar in a manner of screw thread couple, in addition, fine
Drop has AB glue or fiber bar tapered end is dipped in into glue and then is screwed on fiber bar in gap between dimension muscle tapered end and fiber bar, to provide
Enough anchor forces；Fiber bar tapered end is internal thread rim of a cup type nut, and its material is identical with fiber bar, and inner surface is glutinous sand mold,
As the increase of load makes fiber bar lock more and more tight, its height determines according to Ultimate Bearing Capacity of Tension Piles, and leaves 1.2 times
Safety coefficient；Displacement transducer is optical signal displacement meter, is symmetrically mounted on the stake top both sides of the miniature uplift pile of fiber bar, displacement
Sensor is fixedly mounted on datum line beam by magnetic stand；Datum line beam is channel-section steel, positioned at stake holes both sides, the both ends point of datum line beam
It is not supported on buttress, datum line beam installation method meets《Architecture foundation pile inspection specifications》(JGJ106-2014) requirement；Branch
Pier is the cuboid prefabricated components of concreting, and its upper surface is connected with datum line beam, and lower surface is connected with ground.
The miniature uplift pile anti-pulling capacity test device of fiber bar of the present invention is before use, ensure that enlarged footing is high-strength as far as possible
Screw rod, the first billet, load sensor, the second billet, reaction beam the centre of form on the same line, the conjunction of two jack
Power center line should will meet wanting for bearing capacity with the cross section centre of form overlapping of axles of the miniature uplift pile of fiber bar, reaction beam
To ask, while ensure bed course compactness and rigidity below jack pad, pull-out test need to be carried out after 28 days in concreting,
Ensure each member in tight contact in loading device during experiment.
Compared with prior art, installation is simple by the present invention, workable, security reliability is high, device is hardly damaged, can
Reuse, cost is low, can obtain bigger anti-pulling capacity.
Brief description of the drawings：
Fig. 1 is that the agent structure principle of the miniature uplift pile anti-pulling capacity test device of fiber bar of the present invention is illustrated
Figure.
Fig. 2 is the agent structure top view of the miniature uplift pile anti-pulling capacity test device of fiber bar of the present invention.
Fig. 3 is the profile of reaction beam 6 of the present invention.
Fig. 4 is the top view of the high-strength drawing screw rod 1 of enlarged footing of the present invention.
Fig. 5 is the top view of fiber bar tapered end 11 of the present invention.
Fig. 6 is the profile of fiber bar tapered end 11 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 the miniature uplift pile anti-pulling capacity experimental rig of fiber bar described in the present embodiment includes expanding head height
Hale and pull out screw rod 1, high-strength nut 2, the first billet 3, load sensor 4, the second billet 5, reaction beam 6, the 3rd billet
7th, beam stool 8, jack 9, jack pad 10, fiber bar tapered end 11, fiber bar 12, stirrup 13, stake holes 14, displacement transducer
15th, magnetic stand 16, datum line beam 17 and buttress 18；The high-strength drawing screw rod 1 of enlarged footing is by screw rod shaft and bottom enlarged footing group
Into rigid solid structure, the diameter of screw rod shaft determines by the bearing capacity of miniature uplift pile, about 60~80mm, and enlarged footing is in circle
Plate-like, thickness 50mm, edge are formed with some holes, and its hole diameter is determined by the diameter of fiber bar 12, are available for it through peace
Dress；The high-strength nut 2 of hexagon cylindrical structure is connected to the outer surface of enlarged footing high-strength bolt 1 in a manner of screw thread couple,
Multiple be used in series can provide enough counter-forces；The length of side of first billet 3 of square structure is 20cm, thickness 3cm, center
Hole is formed with, the hole diameter is slightly larger than the diameter of enlarged footing high-strength bolt 1, the top of the first billet 3 and the phase of high-strength nut 2
Even, lower end is connected with load sensor 4；Load sensor 4 is punching structure, is intuitively shown by external supporting digital indicator
Show the load of application, the bottom of load sensor 4 is connected with the second billet 5；The length of side of the second billet 5 of square structure is 30cm
× 30cm, thickness 3cm, center are formed with hole, and its hole diameter is slightly larger than the diameter of enlarged footing high-strength bolt 1, the second steel pad
The bottom of plate 5 is connected with reaction beam 6；Reaction beam 6 is welded into box structure using thickness 3cm steel plate, and its span is 1.8m, width
For 30cm, a height of 60cm, reaction beam 6 sets a number of longitudinal stiffener along span direction, it is ensured that reaction beam has enough
Rigidity and stability, UNICOM's hole is reserved with the upper lower flange of span centre reaction beam 6, and hole diameter will be easy to the high-strength spiral shell of enlarged footing
The screw rod shaft of bar 1 passes freely through；Jack pad 10 is symmetrically disposed at the both sides of stake holes 14, not small with the distance at the edge of stake holes 14
In 50cm, to avoid experimental rig sedimentation is excessive from causing test data inaccurate；The bottom of jack 9 is arranged on jack pad
10 centers, the 3rd billet 7 is close at top, and positioned at the center of the 3rd billet 7, two jack 9 are model of the same race, and can
Enough pulling capacities are provided, jack 9 is connected with its supporting high-pressure oil pump, separating valve with high-pressure oil pipe during drawing, realized
Synchronization of jacking up reaction beam 6；The structure of 3rd billet 7 is identical with the second billet 5, and the 3rd billet 7 is placed in into thousand during use
Between jin top 9 and reaction beam 6；The cuboid opening lattice configured construction that beam stool 8 is welded into for shaped steel, a length of 40cm, a width of 30cm,
A height of 40cm, ensure that the high-pressure oil pipe being connected with jack 9 that its side is set can pass freely through, beam stool 8 is placed on very heavy
Push up on backing plate 10, the 3rd billet 7 and jack 9 are respectively positioned on inside beam stool 8；The length of side of jack pad 10 of square structure is
50cm, thickness 3cm, its bottom surface are connected with the levelling sand bedding course that ground is laid in advance；Fiber bar 12 and stirrup 13 are glass
Fibre reinforced plastics (GFRP) full thread solid rod-like structure, for the cohesion of reinforcing fiber muscle and concrete, in stake holes 14
Interior stirrup 13 is used together finer wire colligation in the shape of a spiral, with fiber bar 12 and is connected to form uplift pile fiber bar cage；In stake holes 14
Outer fiber muscle 12 through the circular hole reserved on the high-strength enlarged footing of drawing screw rod 1 of enlarged footing, fiber bar tapered end 11 and fiber bar 12 with
The mode of screw thread couple is anchored on the high-strength drawing screw rod 1 of enlarged footing, in addition, the seam between fiber bar tapered end 11 and fiber bar 12
Drop has AB glue or fiber bar tapered end 11 is dipped in into glue and then is screwed on fiber bar 12 in gap, to provide enough anchor forces；Fiber bar
Tapered end 11 is internal thread rim of a cup type nut, and its material is identical with fiber bar 12, and inner surface is glutinous sand mold, is made with the increase of load
Fiber bar 12 is locked more and more tight, and its height determines according to Ultimate Bearing Capacity of Tension Piles, and leaves 1.2 times of safety coefficient；Position
Displacement sensor 15 is optical signal displacement meter, is symmetrically mounted on the stake top both sides of the miniature uplift pile of fiber bar, and displacement transducer 15 is logical
Magnetic stand 16 is crossed to be fixedly mounted on datum line beam 17；Datum line beam 17 is channel-section steel, positioned at the both sides of stake holes 14, the both ends of datum line beam 17
It is respectively supported on buttress 18, the installation method of datum line beam 17 meets《Architecture foundation pile inspection specifications》(JGJ106-2014)
It is required that；Buttress 18 is the cuboid prefabricated components of concreting, and its upper surface is connected with datum line beam 17, lower surface and ground phase
Even.
The present embodiment realizes that the detailed process of the miniature uplift pile anti-pulling capacity test of fiber bar is：
(1) uplift pile fiber bar cage is made, fiber bar 12 is first passed through into tie hoop 13 one by one, then will with tied silk
The banding fixed of fiber bar 12 forms uplift pile fiber bar cage, 13 respective spacing of fiber bar 12 and stirrup on tie hoop 13
It need to meet existing specification and design requirement with diameter；
(2) by after levelling of the land, first both drilled with down-the-hole drill in fixed pile, forming stake holes 14 and check stake holes 14
Aperture and hole depth, then the lifting of uplift pile fiber bar cage is transferred in stake holes 14, ensure that fiber bar cage is located at the center of stake holes 14, and
With enough protective layer thickness, then casting concrete (intensity of concrete should meet design requirement) from bottom to top, vibrate
Floating stake top after closely knit, concrete test block is made with the conditions of, and whether the intensity for detecting concrete test block meets to require；
(3) after conserving 28 days, loading device is installed, first in the miniature lateral extent pile center at least 50cm of uplift pile two of fiber bar
Position lay 5cm thickness sand bedding course and levelling respectively, ensure that its compactness and rigidity can support top loading device enough, will not
Sedimentation is produced in loading procedure, is then sequentially placed jack pad 10, jack 9, the 3rd steel from bottom to top in the position
Backing plate 7, beam stool 8 and reaction beam 6, while will be enlarged by head height and hale pulling out screw rod 1 and passing through reaction beam 6, in the high-strength drawing spiral shell of enlarged footing
The second billet 5, load sensor 4, the first billet 3, high-strength nut 2 are passed through into the high-strength drawing spiral shell of enlarged footing successively on bar 1
The placed on top of bar 1, rotation high-strength nut 2 adjust the position of the high-strength bottom enlarged footing of drawing screw rod 1 of enlarged footing, now, use fiber
Fiber bar 12 overhanging on the ground is fixed on the high-strength bottom of drawing screw rod 1 of enlarged footing and expanded by muscle tapered end 11 in a manner of screw thread couple
The reserving hole position of major part, high-strength nut 2 finally is tightened with torque spanner, to ensure that enlarged footing is high-strength in whole installation process
The bottom enlarged footing level of drawing screw rod 1 and the uniform stressed of fiber bar 12, and enlarged footing high-strength bolt 1, the first billet 3, lotus
Retransmit sensor 4, the second billet 5 and reaction beam 6 the centre of form on the same line, two jack 9 make a concerted effort center line with it is fine
The cross section centre of form overlapping of axles of the miniature uplift pile of muscle is tieed up, so that the miniature uplift pile uniaxial force of fiber bar；
(4) bearingtest of the miniature uplift pile of fiber bar is carried out, branch is symmetrically put in the miniature uplift pile both sides of fiber bar
Pier 18, datum line beam 17 are arranged on buttress 18, then install magnetic stand 16 and displacement transducer 15, its middle position in datum line beam 17
Displacement sensor 15 is symmetrically installed on the miniature uplift pile stake top of fiber bar, except ensuring that datum line beam 17, displacement transducer 15 do not occur
Outside rocking, test device will also meet《Architecture foundation pile inspection specifications》(JGJ106-2014) requirement, by load sensor
4 are connected on external Acquisition Instrument, and jack 9 passes through supporting high-pressure oil pipe and supporting high-pressure oil pump and the close phase of separating valve
Even, precharge checks whether load sensor, displacement transducer and loading device are working properly, until the reading of load sensor 4
Number reaches 5kN, it was demonstrated that loading device has contacted the miniature uplift pile anti-pulling capacity of close rear beginning test data sheet fiber bar and stake
The amount of pulling out on body.
Claims (2)
1. a kind of miniature uplift pile anti-pulling capacity method of testing of fiber bar, it is characterised in that resisted using the miniature uplift pile of fiber bar
The realization of test of bearing capacity device is pulled out, its detailed process is：
(1) uplift pile fiber bar cage is made, fiber bar is first passed through into tie hoop one by one, then tied up fiber bar with tied silk
Bundle is fixed on tie hoop, forms uplift pile fiber bar cage, fiber bar and the respective spacing of stirrup and diameter need to meet existing
Specification and design requirement；
(2) by after levelling of the land, first both drilled with down-the-hole drill in fixed pile, forming stake holes and check the aperture and hole of stake holes
It is deep, then the lifting of uplift pile fiber bar cage is transferred in stake holes, ensure that fiber bar cage is located at stake holes center, and there is enough guarantors
Covering thickness, then casting concrete from bottom to top, floating stake top after vibration compacting, concrete test block is made with the conditions of, and
Whether the intensity of detection concrete test block meets to require；
(3) after conserving 28 days, loading device is installed, first in the miniature lateral extent pile center of uplift pile two of fiber bar at least 50cm position
Put and lay 5cm thickness sand bedding course and levelling respectively, ensure that its compactness and rigidity can support top loading device enough, will not add
Sedimentation is produced during load, is then sequentially placed jack pad, jack, the 3rd billet, beam from bottom to top in the position
Stool and reaction beam, while will be enlarged by head height and hale pulling out screw rod and passing through reaction beam, successively by the high-strength drawing screw rod of enlarged footing
Two billets, load sensor, the first billet, high-strength nut are laid through the high-strength drawing screw tip of enlarged footing, and rotation is high
The position of the strong nut regulation high-strength drawing screw rod bottom enlarged footing of enlarged footing, now, will be overhanging on the ground with fiber bar tapered end
Fiber bar the reserving hole position of the high-strength drawing screw rod bottom enlarged footing of enlarged footing is fixed in a manner of screw thread couple, finally use
Torque spanner tightens high-strength nut, to ensure that the high-strength drawing screw rod bottom enlarged footing of enlarged footing is horizontal and fine in whole installation process
Tie up muscle uniform stressed, and enlarged footing high-strength bolt, the first billet, load sensor, the shape of the second billet and reaction beam
The heart on the same line, make a concerted effort center line and the cross section centre of form overlapping of axles of the miniature uplift pile of fiber bar of two jack, with
Make the miniature uplift pile uniaxial force of fiber bar；
(4) bearingtest of the miniature uplift pile of fiber bar is carried out, buttress, base are symmetrically put in the miniature uplift pile both sides of fiber bar
Quasi- beam is arranged on buttress, then installs magnetic stand in datum line beam and displacement transducer, wherein displacement transducer are symmetrically pacified
Mounted in the miniature uplift pile stake top of fiber bar, in addition to ensuring datum line beam, displacement transducer and not shaking, test device will also meet
《Architecture foundation pile inspection specifications》(JGJ106-2014) requirement, load sensor is connected on external Acquisition Instrument, thousand
Jin top is closely coupled by supporting high-pressure oil pipe and supporting high-pressure oil pump and separating valve, precharge inspection load sensor,
Whether displacement transducer and loading device are working properly, until the reading of load sensor reaches 5kN, it was demonstrated that loading device has connect
Touch the amount of pulling out on the miniature uplift pile anti-pulling capacity of close rear beginning test data sheet fiber bar and pile body.
2. the miniature uplift pile anti-pulling capacity method of testing of fiber bar according to claim 1, it is characterised in that the fiber
The agent structure of the miniature uplift pile anti-pulling capacity test device of muscle includes the high-strength drawing screw rod of enlarged footing, high-strength nut, first
Billet, load sensor, the second billet, reaction beam, the 3rd billet, beam stool, jack, jack pad, fiber bar
Tapered end, fiber bar, stirrup, stake holes, displacement transducer, magnetic stand, datum line beam and buttress；The high-strength drawing screw rod of enlarged footing is served as reasons
The rigid solid structure of screw rod shaft and bottom enlarged footing composition, the diameter of screw rod shaft are determined by the bearing capacity of miniature uplift pile
For 60~80mm, enlarged footing is in the form of annular discs, thickness 50mm, and edge is formed with some holes, hole diameter by fiber bar diameter
It is determined that be available for fiber bar through installation, empty quantity according to be actually needed determination；The high-strength nut of hexagon cylindrical structure with
The mode of screw thread couple is connected to the outer surface of enlarged footing high-strength bolt, multiple to be used in series to provide enough counter-forces；It is square
The length of side of first billet of structure is 20cm, thickness 3cm, and center is formed with hole, and it is high-strength that the hole diameter is more than enlarged footing
The diameter of screw rod, the first billet top are connected with high-strength nut, and lower end is connected with load sensor；Load sensor is punching
Structure, the load of application, load sensor bottom and the second billet phase are intuitively shown by external supporting digital indicator
Even；The second billet length of side of square structure is 30cm × 30cm, thickness 3cm, and center is formed with hole, and its hole diameter is bigger
In the diameter of enlarged footing high-strength bolt, the bottom of the second billet is connected with reaction beam；Reaction beam is welded using thickness 3cm steel plate
Box structure is connected into, its span is 1.8m, a width of 30cm, a height of 60cm, and reaction beam sets a number of vertical along span direction
To ribbed stiffener, the quantity of longitudinal stiffener is determined according to being actually needed, it is ensured that reaction beam has enough rigidity and stability, across
The upper lower flange of middle reaction beam is reserved with UNICOM's hole, and hole diameter will be easy to enlarged footing high-strength bolt screw rod shaft freely to wear
Cross；Jack pad is symmetrically disposed at the both sides of stake holes, is not less than 50cm with the distance at stake holes edge, to avoid experimental rig from sinking
Drop and excessive cause test data inaccurate；The bottom of jack is arranged on jack pad center, and the 3rd billet is close at top,
And positioned at the 3rd billet center, two jack are model of the same race, and can provide enough pulling capacities, will be very heavy during drawing
Top is connected with its supporting high-pressure oil pump, separating valve with high-pressure oil pipe, realizes synchronization of jacking up reaction beam；The structure of 3rd billet
It is identical with the second billet, the 3rd billet is placed between jack and reaction beam during use；Beam stool is what shaped steel was welded into
Cuboid opening lattice configured construction, a length of 40cm, a width of 30cm, a height of 40cm, ensure being connected with jack for its side setting
High-pressure oil pipe can pass freely through, beam stool is placed on jack pad, and the 3rd billet and jack are respectively positioned in beam stool
Portion；The jack pad length of side of square structure is 50cm, thickness 3cm, the levelling sand bedding course that its bottom surface is laid in advance with ground
It is connected；Fiber bar and stirrup are fiberglass reinforced plastics full thread solid rod-like structure, for reinforcing fiber muscle and coagulation
The cohesion of soil, stirrup in the shape of a spiral, is used together finer wire colligation with fiber bar and is connected to form uplift pile fiber in stake holes
Muscle cage；The circular hole reserved on the high-strength drawing screw rod enlarged footing of enlarged footing, fiber bar tapered end and fiber are passed through in stake holes outer fiber muscle
Muscle is anchored in a manner of screw thread couple on the high-strength drawing screw rod of enlarged footing, in addition, the seam between fiber bar tapered end and fiber bar
Drop has AB glue or fiber bar tapered end is dipped in into glue and then is screwed on fiber bar in gap, to provide enough anchor forces；Fiber bar tapered end
For internal thread rim of a cup type nut, its material is identical with fiber bar, and inner surface is glutinous sand mold, locks fiber bar with the increase of load
Must be more and more tight, its height determines according to Ultimate Bearing Capacity of Tension Piles, and leaves 1.2 times of safety coefficient；Displacement transducer is
Optical signal displacement meter, is symmetrically mounted on the stake top both sides of the miniature uplift pile of fiber bar, and displacement transducer is fixed by magnetic stand
On datum line beam；Datum line beam is channel-section steel, and positioned at stake holes both sides, the both ends of datum line beam are respectively supported on buttress, datum line beam
Installation method meets《Architecture foundation pile inspection specifications》(JGJ106-2014) requirement；Buttress is rectangular for concreting
Body prefabricated components, its upper surface are connected with datum line beam, and lower surface is connected with ground.
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| CN112302063A (en) * | 2020-10-29 | 2021-02-02 | 上海勘察设计研究院(集团)有限公司 | Twisted steel anchoring device and mounting method |
| CN112376630A (en) * | 2020-10-29 | 2021-02-19 | 上海勘察设计研究院(集团)有限公司 | Testing device and method for testing pull-down load of pile foundation |
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