CN204282354U - A kind of device eliminating soft foundation pile foundation negative friction force - Google Patents
A kind of device eliminating soft foundation pile foundation negative friction force Download PDFInfo
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- CN204282354U CN204282354U CN201420654864.0U CN201420654864U CN204282354U CN 204282354 U CN204282354 U CN 204282354U CN 201420654864 U CN201420654864 U CN 201420654864U CN 204282354 U CN204282354 U CN 204282354U
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Abstract
The utility model discloses a kind of device eliminating soft foundation pile foundation negative friction force, soft base section speedway Interflowing area can be widely used in, the pile foundation constructions such as cross way bridge crossing, it pile foundation comprising pour-shaping in soft foundation and the resistance absorber be arranged on outside pile foundation, this resistance absorber is by inner core, urceolus, middle, cover plate, rubber seal ring, lubricating grease, air bag, the formation such as gas tube and suspension hook, unitary construction is simple, make easily, of many uses, when there is the soft foundation generation settlement after construction of pile foundation periphery operation stage in it, by interior, pile foundation is made neither to occur to bottom offset without frictional resistance relative motion between urceolus, the synchronous settlement after construction on pile foundation periphery weak soil and road surface is not stoped yet, therefore the road surface that negative friction causes can be eliminated protrude phenomenon, utilize this device and combining construction method solves the difficult problem of the medium-term and long-term existence of road traffic engineering, also have and economize on resources, promote economic and social benefit, the favourable traffic operation advantage such as safely.
Description
Technical field
The utility model relates to a kind of device for eliminating soft foundation pile foundation frictional resistance, refers to a kind of device eliminating soft foundation pile foundation negative friction force specifically.
Background technology
Soft foundation is widely distributed, and project treatment expense is huge, and settlement of soft foundation is difficult to Forecast and control, brings very large difficulty to engineering construction.Common soft soil base sedimentation divides construction period sedimentation and operation phase settlement after construction, and sedimentation time construction period is long, and the construction period is long, and investment increases; Settlement after construction is many, and operation of engineering projects safeguards that fund input is large, unfavorable operation security, also brings low in economic efficiency, the many serious consequence such as social influence is bad.As soft base section speedway Interflowing area, cross way bridge crossing etc., often occur near OCS under bridge pile foundation road surface protrude phenomenon, both affected attractive in appearance, also cause driving uncomfortable, easily there is traffic accident.Occur that the settling amount of reason mainly due to bridge pile foundation of this phenomenon is very little, settlement of soft foundation is large and cause pile foundation to produce negative friction, so that the soft foundation near OCS under bridge pile foundation creates frictional resistance upwards and occurs protruding phenomenon.Process this disease, usually adopt two kinds of method process at present: method one roots out projection road surface, connect along linkage section road surface; Method two overlays whole linkage section road surface to projecting portion height, costly.Because soft base is in continuation sedimentation, after a period of time, the protrusion phenomenon near pile foundation can occur again repeatedly, takes same method again to process again.The and for example soft base stockyard of harbour, because settlement of soft foundation makes pile foundation produce negative friction, decreases the bearing capacity of pile foundation, likely engineering accident occurs.Therefore, in order to reduce soft foundation pile foundation frictional resistance, at present generally after settlement of soft foundation certain standard, construction drill castinplace pile again, but settlement after construction causes the negative friction of pile foundation fundamentally to solve, and " barrier machine for eliminating earth mortar negative effect and be constructed into pile work method " that disclosed China Patent No. is 200910130401.8, although can solve the negative friction of pile foundation in the construction period, can not solve the negative friction that operation phase settlement after construction causes pile foundation.
Summary of the invention
Technical problem to be solved in the utility model be to overcome prior art defect and provide a kind of can effectively eliminate operation phase work after soft soil base sedimentation and cause the device of pile foundation negative friction force.
Technical problem of the present utility model is achieved through the following technical solutions:
Eliminate a device for soft foundation pile foundation negative friction force, comprise the pile foundation of pour-shaping in soft foundation and be arranged on resistance absorber outside pile foundation, described resistance absorber comprises and is sleeved on inner core outside pile foundation and movable set urceolus outer tube; Stretch out bottom described inner core bottom urceolus and pour into one with pile foundation, the outer circumference surface bottom inner core is also provided with the half elliptic annulus air bag that a circle is fixed by air bag bolt, this air bag is provided with the gas tube being communicated to urceolus top; Described urceolus top is provided with cover plate, this cover plate is provided with the greasing hole between the inside and outside cylinder of multiple connection, base plate is provided with bottom urceolus, the inner periphery end face of this base plate is close on the outer wall of inner core, the inner bottom surface of base plate is provided with rubber seal ring, and the inner ring of this rubber seal ring is upturned and closely obvolvent outer tube on wall; Be provided with between described inside and outside cylinder multiple with inner core center for part in circumference uniform distribution is made in the center of circle, each middle includes a middle part steel wire, in this, the top of part steel wire is provided with the upper bolt group be fixedly connected with on the cover board, the bottom of middle steel wire is provided with the lower bolt group of simultaneously fixing rubber seal ring and base plate, and middle steel wire is provided with multiple ball vertically doing equidistantly to fix.
The Strength co-mputation of described inner core, urceolus and air bag bolt need meet following formula:
Formula one,
In formula:
---uniform outside pressure suffered by inner core ring cross-section (
);
---during pile foundation construction casing end face to inner core ring cross-section bottom surface height (
);
---concrete density (
);
---drilling slurry unit weight (
);
---pulling force suffered by inner core ring cross-section (
);
---the angle of inner core bottom surface ring cross-section periphery any point and horizontal axis (
);
---tensile stress suffered by the ring cross-section of inner core bottom surface (
), in formula 1 be unit height (
);
---inner core ring cross-section wall thickness (
);
---inner core ring cross-section calculating radius (
);
---inner core ring cross-section material allowable tensile stress (
);
Formula two,
In formula:
---pressure suffered by filling concrete to air bag vertical center air bag (
);
---during pile foundation construction casing end face to the vertical center of air bag height (
);
---concrete density (
);
---drilling slurry unit weight (
);
---fixation balloon
shear stress suffered by individual air bag bolt (
);
---fixation balloon
shearing force suffered by individual air bag bolt (
);
---the quantity of air bag bolt;
---the effective projected area of half elliptic annulus horizontal plane of air bag (
);
---the sectional area of single air bag bolt (
);
---the permissible shearing stress of air bag bolt (
).
Formula three,
In formula:
---the inflation pressure of air bag (
),
for casing end face during pile foundation construction to each soil layer of height at air bag center lateral stress (
), after airbag aeration, the half elliptic annulus end of air bag to stretch in Soft Soil Layer 5 ~ 10
, the effect stoping concrete to rise is played in the setting of air bag, avoids resistance absorber to be wrapped up by concrete; Due to the retaining wall effect of borehole wall-protection mud, bored pile can not collapse hole, namely
, be sufficient for sb.'s need on the right of visible formula three, only need airbag aeration pressure
meet formula three left side;
---during pile foundation construction casing end face to the vertical center of air bag height (
);
---during pile foundation construction ground to the vertical center of air bag height (
);
---the weighted average lateral pressure coefficient (dimensionless) of each soil layer of height at ground to air bag vertical center during pile foundation construction;
---during pile foundation construction each soil layer of height at ground to the vertical center of air bag weighted average unit weight (
);
---drilling slurry unit weight (
).
Be provided with 3 ~ 4 suspension hooks in described inner core, each suspension hook is steel suspension hook, the bottom of each suspension hook be equipped with inner core bottom " U " type hook of connecting of hook, the top of each suspension hook is equipped with wire rope.
Described urceolus is the cylinder that high strength glass Steel material is made, and its vertical cross-section is in " ［ ］ " type, and be provided with the conical section of one section of variable diameters bottom this urceolus, the height of this conical section is 20 ~ 30
, described greasing hole is provided with 3 ~ 5 on the cover plate at urceolus top, all adjacent inner side being arranged on urceolus interior diameter, each greasing hole.
Described inner core is the cylinder that high strength glass Steel material is made, the interior diameter larger than Pile Diameter 1 ~ 2 of this inner core
, between inner core external diameter and urceolus interior diameter, reserve 2 ~ 3
middle part installing space, the installation site of described air bag bottom inner core on outer circumference surface is 50 ~ 60 apart from inner core bottom
height.
The middle part steel wire diameter of described each middle is 0.4 ~ 1
, on middle steel wire, adjacent two ball spacing are 50 ~ 100
, ball is glass fiber reinforced plastic ball, and this ball diameter is 1.9 ~ 2.9
, and in ratio, the distance of part installing space is little by 0.1 ~ 0.2
, be respectively equipped with steel wire knot in the upper and lower of ball, this steel wire knot is fixedly connected on middle steel wire.
Described rubber seal ring thickness is 1 ~ 2
, it is upturned and closely the inner ring of obvolvent wall outer tube stretches out the width of inner bottom surface is 1 ~ 2
.
Described air bag is rubber pneumatic bag, and this air bag is hollow semi-elliptical annulus, and vertical maximum gauge is 10 ~ 20
, the blowing pressure is 0.2 ~ 0.3Mpa, and the half elliptic annulus outer end of air bag to stretch in Soft Soil Layer 5 ~ 10
.
Described soft foundation comprises the Soft Soil Layer on upper strata and the bearing stratum of lower floor, the employing of this Soft Soil Layer plastic draining board, powder spray piling, cement mixing pile etc. wherein one or more combined methods process, Soft Soil Layer fills highway subgrade and carries out grade and carry or surcharge preloading, surfacing in highway subgrade; Described pile foundation is bored pile, first in soft foundation, gets out pile foundation hole and place pile foundation steel bar cage, and Reperfu-sion cement concrete forms pile foundation.
Compared with prior art, the utility model mainly arranges one by inner core outside pile foundation, urceolus, middle, cover plate, rubber seal ring, lubricating grease, air bag, the resistance absorber that gas tube and suspension hook etc. are formed, this resistance absorber simple structure, make easily, of many uses, when there is the soft foundation generation settlement after construction of pile foundation periphery operation stage in it, by interior, pile foundation is made neither to occur to bottom offset without frictional resistance relative motion between urceolus, the synchronous settlement after construction on pile foundation periphery weak soil and road surface is not stoped yet, therefore better can eliminate the road surface that negative friction causes and protrude phenomenon, utilize this can eliminate negative friction device and solve the difficult problem of the medium-term and long-term existence of road traffic engineering undoubtedly in conjunction with corresponding construction method, and have and economize on resources, promote economic and social benefit, the favourable traffic operation advantage such as safely.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the resistance absorber structural representation be arranged on outside pile foundation.
Fig. 3 is the top view of Fig. 2.
Fig. 4 is the A place enlarged drawing of Fig. 2.
Fig. 5 is the B place enlarged drawing of Fig. 2.
Fig. 6 is the structural representation of middle.
Fig. 7 is the stressed schematic diagram of inner core.
Fig. 8 is the Force Calculation figure of inner core.
Fig. 9 is the structure stress schematic diagram of resistance absorber.
Detailed description of the invention
To elaborate again to the utility model embodiment by above-mentioned accompanying drawing below.
As shown in Fig. 1 ~ Fig. 9,1. part bolt hole, 42. pile foundation casings in part installing space in part steel wire, 333. balls, 334. in bolt group, 332. on part, 331. in soft foundation, 11. road surfaces, 12. roadbeds, 13. Soft Soil Layers, 14. bearing stratums, 2. pile foundation, 3. resistance absorber, 31. inner cores, 32. urceolus, 321. base plates, 33., 335. steel wires knots, 336. times bolt groups, 34. cover plates, 35. greasing holes, 36. rubber seal rings, 361. inner rings, 37. air bags, 38. air bag bolts, 39. gas tubes, 40. suspension hooks, 4. lubricating grease, 41..
A kind of device eliminating soft foundation pile foundation negative friction force, the pile foundation construction of the means of transportation such as soft base section speedway Interflowing area, cross way bridge crossing can be widely used in, it pile foundation 2 comprising pour-shaping in soft foundation and the resistance absorber 3 be arranged on outside pile foundation.
Described soft foundation 1, upper strata is Soft Soil Layer 13, lower floor's bearing stratum 14 is the better soil layer of soil property, pile foundation 2 bearing capacity can be born, wherein Soft Soil Layer 13 need adopt plastic draining board, powder spray piling, cement mixing piles etc. wherein one or more combined methods process, fill again highway subgrade 12 carry out grade carry or surcharge preloading, surfacing 11 after soft foundation 1 is deposited to the rate of settling of designing requirement, after this posterior settlement during highway operation is settlement after construction, and due to the generation of soft foundation 1 settlement after construction, subgrade and pavement has the trend along with sedimentation, pile foundation 2 produces negative friction, hinder the uniform settlement of subgrade and pavement near pile foundation, so subgrade and pavement produces protruding phenomenon near pile foundation 2, affect traffic safety.
Described pile foundation 2 is bored pile, first in soft foundation 1, gets out pile foundation hole and place pile foundation steel bar cage, and Reperfu-sion cement concrete forms pile foundation 2.
Described resistance absorber 3 comprises and is sleeved on inner core 31 outside pile foundation 2 and movable set urceolus 32 outer tube, and this inner core and urceolus are cylindrical shape, outer tube between diameter and urceolus interior diameter reserved 2 ~ 3
middle part installing space 334.
The vertical cross-section of described urceolus 32, in " ［ ］ " type, makes of high-strength materials such as glass fiber reinforced plastic, can bear the pressure of soft foundation 1 pressure and pile foundation 2 placing cement concrete in injection, bottom urceolus 32 20 ~ 30
one section is the conical section of variable diameters, can reduce the resistance that urceolus moves down.
The top of described " ［ ］ " type urceolus 32 is provided with cover plate 34, this cover plate is provided with circumferentially equally distributed two row's circular holes in plum blossom-shaped, wherein row's circular hole is located at inner side, part bolt hole 41 in middle installing space 334 is fit into mainly as part in confession 33, another row's circular hole is the greasing hole 35 being located at outside, use mainly as greasing and exhaust, its quantity is 3 ~ 5, and be disposed adjacent in the inner side of urceolus 32 interior diameter, each greasing hole 35 is all connected with middle installing space 334, wherein 1 ~ 2 greasing hole 35 is for injecting lubricating grease 4, all the other are for exhaust, lubricating grease 4 is that the grease-like of stiff is semi-solid.
The bottom of described " ［ ］ " type urceolus 32 is also provided with base plate 321, the inner periphery end face of this base plate is close on the outer wall of inner core 31, the inner bottom surface of base plate 321 is provided with rubber seal ring 36, this rubber seal ring is provided with bolt hole, in can supplying, the lower bolt group 336 of part 33 is through fixing, the thickness 1 ~ 2 of rubber seal ring 36
, inner ring 361 width stretches out inner bottom surface 1 ~ 2
extension be upturned and closely obvolvent on inner core 31 outer wall, the effect of middle part installing space 334 reserved between the inwall playing closed inner tank theca and urceolus 32, prevents that the lubricating grease 4 injected from leaking, borehole wall-protection mud and the Groundwater infiltration between the operating period.
Described inner core 31 interior diameter larger than the diameter of pile foundation 21 ~ 2
, inner core 31 local distortion can be guaranteed and not affect the size of pile foundation, stretching out bottom inner core 31 bottom urceolus 32 and pour into one with pile foundation 2, the outer wall periphery bottom inner core 31 is also provided with the air bag 37 that a circle is fixed by air bag bolt 38.
Described air bag 37 is rubber making, in hollow semi-elliptical annulus, and vertical maximum gauge 10 ~ 20
, apart from the bottom of inner core 50 ~ 60 at the bottom of air bag
highly; Air bag 37 external diameter is than the actual drilling diameter in pile foundation 2 hole large 5 ~ 10 got out
; The effect arranging air bag 37 is: due to the swing of bored pile rig rotating shaft, and the actual drilling diameter in pile foundation 2 hole is than designing the diameter of pile foundation 2 more greatly, and construction technique normalizing regulation bored pile casing interior diameter is not less than design Pile Diameter 20
, the ratio of construction norm regulation actual concrete perfusion side amount and theoretical perfusion side amount is no more than 1.25, for common pile foundation 2 diameter 1 ~ 2.5
calculate the actual drilling diameter of bored pile pile foundation 2 than design pile foundation 2 diameter large 0.24 ~ 0.60
, and inner core 31, urceolus 32 external diameter are all little than the actual drilling diameter in pile foundation 2 hole, during bored pile placing cement concrete in injection, will part beyond resistance absorber 3 inner core 31 outer wall are poured in concrete, and the drag-reduction effect of resistance absorber 3 was lost efficacy; Gas tube 39 established by air bag 37, and gas tube extends to urceolus 32 top and inflates for air bag 37, the blowing pressure 0.2 ~ 0.3(
); After air bag 37 is inflated, air bag 37 half elliptic annulus outer end to stretch in Soft Soil Layer 13 5 ~ 10
, space between inner core 31 outer wall and pile foundation 2 hole hole wall will be sealed, thus play the effect stoping concrete to pour into and rise, and avoid part beyond resistance absorber 3 inner core 31 outer wall to be wrapped up by concrete, lose drag-reduction effect.
Be provided with suspension hook 40 in described inner core 31, this suspension hook 40 is steel, quantity 3 ~ 4, and hook connects inner core 31 base section and is set to " U " type hook, and top is wire rope, plays the effect fixing resistance absorber 3 in lifting and work progress.
Described urceolus 32 length is
, inner core 31 length is
, wherein
for soft foundation settlement amount after construction; Inner core 31 end length in reserve
.
Above parameter is determined by calculating or testing, and also can use following defining method:
(1), inner core 31 length is
Inner core 31 length relevant with settlement after construction influence basin, namely relevant with thickness of soft soil with vehicular load, roadbed height, because the compaction roadbed Compression Settlement of construction period terminates substantially, vehicular load on settlement after construction impact and not obvious, Soft Soil Layer 13 thickness is the main cause of settlement after construction.
The thicker settlement amount after construction of Soft Soil Layer 13 is larger, but when its thickness exceedes a certain numerical value, settlement after construction recruitment obviously reduces and tends towards stability.Thickness of soft soil has certain limit to settlement amount after construction impact in other words, and for general Soft Soil Layer, thickness of soft soil reaches 20 ~ 30
after, not obvious on settlement amount after construction impact.Therefore
, Soft Soil Layer 13 thickness 20 ~ 30
the degree of depth, inner core length
value is thickness of soft soil value;
, Soft Soil Layer 13 thickness is greater than 30
the degree of depth, inner core length
value is 30
.
(2)
value
By relevant specification, within speedway service life, soft foundation 1 subgrade and pavement settlement after construction general control is 0.3
within.Engineering practice for many years shows, the bump cumulative amount near soft soil roadbed bridge crossing pile foundation is generally 1
within.Therefore,
value is conservative gets 1 ~ 2
.When Soft Soil Layer is darker,
the conservative value of value is little on construction costs impact, because of
be worth the total length with inner core 31, urceolus 32
differ an order of magnitude.
(3)
value
for the pre-allowance of inner core, wherein a part is for installing air bag 37, the vertical gross thickness 10 ~ 20 of air bag 37
, bottom air bag 37 following 50 ~ 60
can height use by closed concrete as inspection during concrete perfusion.
Be provided with in middle part installing space 334 between described inside and outside cylinder multiple with inner core 31 center for part 33 in circumference uniform distribution is made in the center of circle, in this, the quantity of part is determined by the diameter of pile foundation 2, the level interval 50 ~ 60 between middle 33
.Each middle 33 includes middle part steel wire 332 and fixedly goes here and there several vertical at a distance of 50 ~ 100
multiple balls 333 of distance, ball is made by glass fiber reinforced plastic, and ball diameter is less by 0.1 ~ 0.2 than part installing space 334 in reserved between the external diameter of inner core 31 and the interior diameter of urceolus 32
, in order to urceolus 32 along the free slippage of inner core 31 vertical direction; Middle steel wire 332 upper and lower end parts is equipped with bolt group, and upper bolt group 331 is fixed on cover plate 34 by part bolt hole 41 on cover plate 34, and rubber seal ring and base plate 321 are fixed through the bolt hole on rubber seal ring 36 by lower bolt group 336 simultaneously.
Described middle part steel wire 332 diameter about 0.4 ~ 1
, each ball 333 upper and lower is tied 335 by steel wire and is fixed on middle steel wire 332, and the spacing of adjacent two steel wires knot 335 is than ball diameter long 0.1 ~ 0.3
, make ball not only fixing but also have the displacement of certain limit, reduce the frictional resistance of urceolus or inner core, ball 333 is simultaneously shaping with middle steel wire 332, ball 333 external diameter 1.9 ~ 2.9
, when urceolus 32 moves down, between ball 333, spacing amplitude of variation is less, to guarantee that inner core 31 is constant with the relative distance of urceolus 32, and the resistance that the local distortion of reducing urceolus moves down with increase urceolus; Meanwhile, ball 333 can horizontally rotate around middle steel wire 332, reduces the frictional resistance of ball and urceolus or inner core when urceolus moves down to a certain extent.
The Strength co-mputation of described inner core 31, urceolus 32 and air bag bolt 38 also needs to meet following formula:
Formula one,
In formula:
---uniform outside pressure suffered by inner core 31 ring cross-section (
);
---when pile foundation 2 is constructed casing end face to inner core ring cross-section bottom surface height (
);
---concrete density (
);
---drilling slurry unit weight (
);
---pulling force suffered by inner core 31 ring cross-section (
);
---the angle of inner core 31 bottom surface ring cross-section periphery any point and horizontal axis (
);
---tensile stress suffered by the ring cross-section of inner core 31 bottom surface (
), in formula 1 be unit height (
);
---inner core 31 ring cross-section wall thickness (
);
---inner core 31 ring cross-section calculating radius (
);
---inner core 31 ring cross-section material allowable tensile stress (
);
Formula two,
In formula:
---filling concrete to the pressure of air bag 37 vertically suffered by the air bag of center (
);
---when pile foundation 2 is constructed casing end face to the vertical center of air bag height (
);
---concrete density (
);
---drilling slurry unit weight (
);
---fixation balloon 37
shear stress suffered by individual air bag bolt (
);
---fixation balloon 37
shearing force suffered by individual air bag bolt (
);
---the quantity of air bag bolt 38;
---the effective projected area of half elliptic annulus horizontal plane of air bag 37 (
);
---the sectional area of single air bag bolt 38 (
);
---the permissible shearing stress of air bag bolt 38 (
).
Formula three,
In formula:
---the inflation pressure of air bag (
),
for casing end face during pile foundation construction to each soil layer of height at air bag center lateral stress (
), after airbag aeration, the half elliptic annulus end of air bag to stretch in Soft Soil Layer 5 ~ 10
, the effect stoping concrete to rise is played in the setting of air bag, avoids resistance absorber to be wrapped up by concrete; Due to the retaining wall effect of borehole wall-protection mud, bored pile can not collapse hole, namely
, be sufficient for sb.'s need on the right of visible formula three, only need airbag aeration pressure
meet formula three left side;
---when pile foundation 2 is constructed casing end face to air bag 37 vertically center height (
);
---when pile foundation 2 is constructed ground to air bag 37 vertically center height (
);
---when pile foundation 2 is constructed, ground is to the weighted average lateral pressure coefficient (dimensionless) of each soil layer of height at the vertical center of air bag 37;
---when pile foundation 2 is constructed ground to air bag 37 vertically each soil layer of height at center weighted average unit weight (
);
---drilling slurry unit weight (
).
The construction method of described elimination soft foundation pile foundation negative friction force device, its Specific construction step is as follows:
Step one, make all parts of resistance absorber 3 by designing requirement;
Step 2, vertical cross-section in " ［ ］ " type urceolus 32 lower raft 321 inner bottom surface on place rubber seal ring 36;
Step 3, between inner core 31 external diameter and urceolus 32 interior diameter in part 33 in multiple circumference uniform distribution is installed in part installing space 334, and the upper bolt group 331 of middle is tightened with cover plate 34 and the lower bolt group 336 of middle 33 while be tightened with rubber seal ring 36, base plate 321;
Step 4, bottom inner core 31, air bag 37 is installed, this air bag 37 to inner core bottom reserved 50 ~ 60
height;
Step 5, the urceolus 32 assembled and middle 33 are inserted in outside inner core, clamp urceolus and inner core with fixture temporarily, keep the inner ring of rubber seal ring to be upturned and closely obvolvent on inner core 31 outer wall;
Step 6, between urceolus 32 and inner core 31, fill lubricating grease 4 by 1 ~ 2 greasing hole 35, check whether all the other greasing holes 35 have lubricating grease 4 to overflow, till all the other greasing holes 35 all have lubrication seborrhea 4 to go out, check simultaneously and whether leak lubricating grease 4 bottom urceolus 32, reveal if any lubricating grease, then need to check whether rubber seal ring 36 is installed accurately, then close greasing hole 35 with rubber stopper;
Step 7, on soft foundation 1, get out pile foundation hole, the diameter of this pile foundation hole need consider the size of resistance absorber 3, the shaping rear inspection size of pile foundation hole, needs the pile foundation hole size of Measurement accuracy air bag 37 position especially, ensure air bag enough inflate after horizontal dimension be greater than the size 5 ~ 10 of pile foundation hole
, the concrete effect of air sac sealing can be ensured, must more ventilation bag as requirement can not be reached, till meeting the demands, inner core 31 is installed suspension hook 40, then resistance absorber 3 is hung in pile foundation hole by pile foundation casing 42;
Step 8, inner core 31 inside install pile foundation steel bar cage, the wire rope of suspension hook 40 is fixed on pile foundation casing 42;
Step 9, put into tremie concrete, bottom filling concrete to inner core 31 10 ~ 20
height time, suspend filling concrete;
Step 10, air pump is connected gas tube 39 inflate to air bag 37, the blowing pressure 0.2 ~ 0.3(
);
Step 11, continuation concrete perfusion, measure concrete lifting height, when concrete rises 20 ~ 30
time, be now embedded in concrete bottom inner core 31; Concrete perfusion rises 20 ~ 30 again
, the concrete now between inner core and urceolus is also by rising 20 ~ 30
namely the top of concrete poured into and air bag 37 bottom surface close, observing between the urceolus 32 of resistance absorber 3 and pile foundation casing 42 and overflow with or without slurry coat method, as overflowed without slurry coat method, illustrating that air bag 37 reaches the effect in space between sealing inner tank theca and pile foundation hole inwall; Overflow if any mud, inflation adds atmospheric pressure and reaches sealing effectiveness to make air bag again, continues to observe and overflow, until filling concrete is complete with or without mud in filling concrete process;
Step 12, reach after some strength until concrete, shed temporary fixed urceolus, inner core fixture and extract pile foundation casing 42, pour into integrally bottom this pile foundation 2 and inner core 31.
The soft foundation generation settlement after construction of pile foundation periphery is there is in operation stage, the urceolus of this resistance absorber, middle and lubricating grease are also along with periphery weak soil synchronously sinks, due to resistance absorber without frictional resistance effect, pile foundation neither occurs to bottom offset, do not stop the synchronous settlement after construction on pile foundation periphery weak soil and road surface, eliminate the road surface protrusion phenomenon that negative friction causes yet.
After pile foundation filling concrete has been constructed, resistance absorber 3 inner core becomes to be integrated with bored pile, and inner core 31 can be jointly stressed with pile foundation 2, can consider the stressed of inner tube structure during design, reduces the amount of reinforcement of pile foundation 2, also plays the effect of protection pile foundation reinforcing bar; Meanwhile, because air bag 37 seals the space between inner core 31 outer wall and pile foundation hole hole wall, concrete amount is decreased, saving construction cost.In operation stage, as the weak soil generation sedimentation of pile foundation 2 periphery, the urceolus 32 of resistance absorber 3, middle 33 and lubricating grease 4 also sink along with periphery soil is synchronous, due to resistance absorber 3 without frictional resistance effect, pile foundation 2 eliminates negative friction, neither occur to bottom offset, also do not stop pile foundation periphery soil and road surface synchronously settlement after construction to occur, thus eliminate the road surface protrusion phenomenon that negative friction causes.
The utility model reflects the concrete condition of this device more in detail with two embodiment tables,
Embodiment 1(Pile Diameter 1
)
Roadbed, road surface and Soft Soil Layer 10m, the resistance absorber physical dimension table (unit: m) of Pile Diameter 1m
Note: above diameter be calculated diameter (
), calculated diameter=internal diameter+wall thickness.
Embodiment 2(Pile Diameter 1.5
)
Roadbed, road surface and Soft Soil Layer 20
, Pile Diameter 1.5
resistance absorber physical dimension table (unit:
)
Note: above diameter be calculated diameter (
), calculated diameter=internal diameter+wall thickness.
Embodiment described in the utility model is only not used in restriction scope of the present utility model for illustration of the utility model.Should be understood that those skilled in the art can make various changes or modifications the utility model, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the utility model instruction in addition.
Claims (9)
1. eliminate a device for soft foundation pile foundation negative friction force, the pile foundation (2) comprising soft foundation (1) interior pour-shaping and the resistance absorber (3) be arranged on outside pile foundation, is characterized in that:
A, described resistance absorber (3) comprise and are sleeved on pile foundation (2) inner core outward (31) and movable set urceolus outer tube (32);
B, described inner core (31) bottom is stretched out urceolus (32) bottom and is poured into one with pile foundation (2), the outer circumference surface of inner core (31) bottom is also provided with the half elliptic annulus air bag (37) that a circle is fixed by air bag bolt (38), and this air bag is provided with the gas tube (39) being communicated to urceolus (32) top;
C, described urceolus (32) top are provided with cover plate (34), this cover plate is provided with the greasing hole (35) between the inside and outside cylinder of multiple connection, urceolus (32) bottom is provided with base plate (321), the inner periphery end face of this base plate is close on the outer wall of inner core (31), the inner bottom surface of base plate (321) is provided with rubber seal ring (36), the inner ring (361) of this rubber seal ring be upturned and closely obvolvent on inner core (31) outer wall;
Be provided with between d, described inside and outside cylinder multiple with inner core center for part in circumference uniform distribution (33) is made in the center of circle, each middle includes a middle part steel wire (332), in this, the top of part steel wire is provided with the upper bolt group (331) be fixedly connected on cover plate (34), the bottom of middle steel wire (332) is provided with the lower bolt group (336) of simultaneously fixing rubber seal ring (36) and base plate (321), and middle steel wire (332) is provided with multiple ball (333) vertically doing equidistantly to fix.
2. a kind of device eliminating soft foundation pile foundation negative friction force according to claim 1, is characterized in that the Strength co-mputation of described inner core (31), urceolus (32) and air bag bolt (38) need meet following formula:
Formula one,
In formula:
---uniform outside pressure suffered by inner core (31) ring cross-section (
);
---during pile foundation (2) construction casing end face to inner core ring cross-section bottom surface height (
);
---concrete density (
);
---drilling slurry unit weight (
);
---pulling force suffered by inner core (31) ring cross-section (
);
---the angle of inner core (31) bottom surface ring cross-section periphery any point and horizontal axis (
);
---tensile stress suffered by the ring cross-section of inner core (31) bottom surface (
), in formula 1 be unit height (
);
---inner core (31) ring cross-section wall thickness (
);
---inner core (31) ring cross-section calculating radius (
);
---inner core (31) ring cross-section material allowable tensile stress (
);
Formula two,
In formula:
---filling concrete to the pressure of air bag (37) vertically suffered by the air bag of center (
);
---during pile foundation (2) construction casing end face to air bag (37) vertically center height (
);
---concrete density (
);
---drilling slurry unit weight (
);
---fixation balloon (37)
shear stress suffered by individual air bag bolt (38) (
);
---fixation balloon (37)
shearing force suffered by individual air bag bolt (38) (
);
---the quantity of air bag bolt (38);
---the effective projected area of half elliptic annulus horizontal plane of air bag (37) (
);
---the sectional area of single air bag bolt (38) (
);
---the permissible shearing stress of air bag bolt (38) (
);
Formula three,
In formula:
---the inflation pressure of air bag (
),
for casing end face during pile foundation construction to each soil layer of height at air bag center lateral stress (
), after airbag aeration, the half elliptic annulus end of air bag to stretch in Soft Soil Layer (13) 5 ~ 10
, the effect stoping concrete to rise is played in the setting of air bag, avoids resistance absorber to be wrapped up by concrete; Due to the retaining wall effect of borehole wall-protection mud, bored pile can not collapse hole, namely
, be sufficient for sb.'s need on the right of visible formula three, only need airbag aeration pressure
meet formula three left side;
---during pile foundation (2) construction casing end face to the vertical center of air bag height (
);
---during pile foundation construction ground to the vertical center of air bag height (
);
---during pile foundation (2) construction, ground is to the weighted average lateral pressure coefficient (dimensionless) of each soil layer of height at the vertical center of air bag (37);
---during pile foundation (2) construction ground to air bag (37) vertically each soil layer of height at center weighted average unit weight (
);
---drilling slurry unit weight (
).
3. a kind of device eliminating soft foundation pile foundation negative friction force according to claim 1, it is characterized in that being provided with 3 ~ 4 suspension hooks (40) in described inner core (31), each suspension hook is steel suspension hook, the bottom of each suspension hook is equipped with " U " type hook connected with inner core (31) bottom hook, and the top of each suspension hook (40) is equipped with wire rope.
4. a kind of device eliminating soft foundation pile foundation negative friction force according to claim 1, it is characterized in that the cylinder that described urceolus (32) is made for high strength glass Steel material, its vertical cross-section is in " ［ ］ " type, be provided with the conical section of one section of variable diameters bottom this urceolus, the height of this conical section is 20 ~ 30
, described greasing hole (35) is provided with 3 ~ 5 on the cover plate (34) at urceolus (32) top, all adjacent inner side being arranged on urceolus (32) interior diameter of each greasing hole (35).
5. a kind of device eliminating soft foundation pile foundation negative friction force according to claim 1, it is characterized in that the cylinder that described inner core (31) is made for high strength glass Steel material, the interior diameter of this inner core (31) is than pile foundation (2) diameter large 1 ~ 2
, between inner core (31) external diameter and urceolus (32) interior diameter, reserve 2 ~ 3
middle part installing space (334), described air bag (37) inner core (31) bottom outer circumference surface on installation site apart from inner core bottom be 50 ~ 60
height.
6. a kind of device eliminating soft foundation pile foundation negative friction force according to claim 5, is characterized in that middle part steel wire (332) diameter of described each middle (33) is 0.4 ~ 1
, on middle steel wire, adjacent two ball (333) spacing are 50 ~ 100
, ball is glass fiber reinforced plastic ball, and this ball diameter is 1.9 ~ 2.9
, and in ratio, the distance of part installing space (334) is little by 0.1 ~ 0.2
, be respectively equipped with steel wire knot (335) in the upper and lower of ball (333), this steel wire knot is fixedly connected on middle steel wire (332).
7. a kind of device eliminating soft foundation pile foundation negative friction force according to claim 1, is characterized in that described rubber seal ring (36) thickness is 1 ~ 2
, it is upturned and the width that closely obvolvent stretches out inner bottom surface at the inner ring (361) of inner core (31) outer wall is 1 ~ 2
.
8. a kind of device eliminating soft foundation pile foundation negative friction force according to claim 1, it is characterized in that described air bag (37) is rubber pneumatic bag, this air bag is hollow semi-elliptical annulus, and vertical maximum gauge is 10 ~ 20
, the blowing pressure is 0.2 ~ 0.3Mpa, and Soft Soil Layer (13) interior 5 ~ 10 is stretched in the half elliptic annulus outer end of air bag (37)
.
9. a kind of device eliminating soft foundation pile foundation negative friction force according to claim 1, it is characterized in that described soft foundation (1) comprises the Soft Soil Layer (13) on upper strata and the bearing stratum (14) of lower floor, this Soft Soil Layer (13) employing plastic draining board, powder spray piling, cement mixing pile etc. wherein one or more combined methods process, Soft Soil Layer (13) fills highway subgrade (12) and carries out grade and carry or surcharge preloading, surfacing (11) in highway subgrade; Described pile foundation (2) is bored pile, first in soft foundation (1), gets out pile foundation hole and place pile foundation steel bar cage, and Reperfu-sion cement concrete forms pile foundation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420654864.0U CN204282354U (en) | 2014-11-05 | 2014-11-05 | A kind of device eliminating soft foundation pile foundation negative friction force |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420654864.0U CN204282354U (en) | 2014-11-05 | 2014-11-05 | A kind of device eliminating soft foundation pile foundation negative friction force |
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|---|---|
| CN204282354U true CN204282354U (en) | 2015-04-22 |
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ID=52865534
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|---|---|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104372795A (en) * | 2014-11-05 | 2015-02-25 | 温州市交通规划设计研究院 | Device for eliminating pile foundation negative frictional resistance of soft soil foundation and construction method |
| CN105507317A (en) * | 2016-01-08 | 2016-04-20 | 中国中铁航空港建设集团有限公司 | Coated single-layer steel casing capable of reducing lateral frictional resistance |
| CN105649075A (en) * | 2016-01-27 | 2016-06-08 | 太原理工大学 | Device and method for reducing negative friction of bored pile |
| CN108517862A (en) * | 2018-03-26 | 2018-09-11 | 中冶天工集团有限公司 | A kind of construction method of side felting |
| CN110158585A (en) * | 2019-05-22 | 2019-08-23 | 东南大学 | A kind of device and construction method for cutting down Soft Soil Area pile foundation negative friction force |
-
2014
- 2014-11-05 CN CN201420654864.0U patent/CN204282354U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104372795A (en) * | 2014-11-05 | 2015-02-25 | 温州市交通规划设计研究院 | Device for eliminating pile foundation negative frictional resistance of soft soil foundation and construction method |
| CN105507317A (en) * | 2016-01-08 | 2016-04-20 | 中国中铁航空港建设集团有限公司 | Coated single-layer steel casing capable of reducing lateral frictional resistance |
| CN105649075A (en) * | 2016-01-27 | 2016-06-08 | 太原理工大学 | Device and method for reducing negative friction of bored pile |
| CN108517862A (en) * | 2018-03-26 | 2018-09-11 | 中冶天工集团有限公司 | A kind of construction method of side felting |
| CN110158585A (en) * | 2019-05-22 | 2019-08-23 | 东南大学 | A kind of device and construction method for cutting down Soft Soil Area pile foundation negative friction force |
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