CN104790390B - The stake mould of a kind of cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake and construction method - Google Patents
The stake mould of a kind of cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake and construction method Download PDFInfo
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- CN104790390B CN104790390B CN201510226120.8A CN201510226120A CN104790390B CN 104790390 B CN104790390 B CN 104790390B CN 201510226120 A CN201510226120 A CN 201510226120A CN 104790390 B CN104790390 B CN 104790390B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses stake mould and the construction method thereof of a kind of cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake.Stake mould is by X shape stake mould outer tube, and circular stake mould inner tube forms；Being wound around DC coil in circular stake mould inner tube outer helical connected in star, coil both positive and negative polarity is connected with D.C. regulated power supply by two linear grooves；Its construction method comprises the following steps: stake machine is in place, closes flap valve shoe；Sink to a mould；Perfusion steel fiber reinforced concrete；Connect DC source, produce in stake mould cavity structure along the axial magnetic field of stake；Vibration pipe-drawing；Stake mould extracts ground, forms complete pile body；The present invention utilizes electromagnetic induction principle to be the directional profile state that steel fibre forms with the axially in parallel arrangement of stake cleverly, significantly improves the horizontal bearing capacity of stake, and construction technology is simple, workable, has significantly expanded its range of application.
Description
Technical field
The invention belongs to civil construction project technical field, fine particularly to a kind of cast-in-place X-shaped large-diameter hollow orientation steel
The stake mould of dimension concrete-pile and construction method thereof.
Background technology
Build highway, railway, bridge etc. in soft clay area and need soft soil foundation is carried out consolidation process, and pile foundation and multiple
Closing foundation technical is the foundation treatment technology being most widely used.Vertical Bearing Capacity of Pile Foundation is by pile side friction and end resistance
Two parts form, and the performance at deep soft soil foundation Lateral frictional resistance is particularly important.The most how to improve unit materials
Rate of utilization of strength, improve bearing capacity of pile foundation while construction material consumption saving, be the important class paid close attention to for a long time of research worker
One of topic.
Before making the present invention, Chinese patent " cast-in-place X-shaped large-diameter hollow concrete pile and construction method thereof " (patent No.:
ZL201010215965.4), combined cast-in-situ X-shaped concrete-pile and the technological merit of cast-in-place concrete large-diameter tubular pile, examine simultaneously
Consider stake side odd-shaped cross section form and stake core is native to improving unit concrete material utilization rate and the effect of bearing capacity of pile foundation, be a kind of
Economical rationality, the pile-type that cost performance is superior.But this kind of stake is plain concrete pile, its shortcoming is that horizontal shear intensity is less,
Thus the level that is difficult to use in is to the biggest operating mode of load, its range is the most restricted.Therefore consider that use can dramatically increase stake
The steel fiber reinforced concrete of body horizontal bearing capacity pours.
The preparation technology of the steel fiber reinforced concrete generally used is to be mixed together with steel fibre by the raw materials such as sand, stone, cement
Close, add mixing water and stir, enter mould vibration compacting.According to the steel fiber reinforced concrete of this traditional handicraft molding, steel fibre
Random random distribution in concrete.In Practical Project, the steel of only consistent or close with stake axial direction fraction is fine
Dimension just plays the effect being effectively improved pile body horizontal bearing capacity.The shortcoming of existing preparation technology is having of steel fibre in concrete
Effect utilization ratio is the lowest, and substantial portion of steel fibre cannot play desired shearing resistance effect, also results in simultaneously and prepares steel fibre
The raw material usage of concrete is greatly increased.
Summary of the invention
It is an object of the invention to overcome the cast-in-place X-shaped hypodynamic defect of large-diameter hollow concrete pile horizontal bearing,
While considering that stake side odd-shaped cross section form and stake core soil are to improving unit concrete material utilization rate and vertical bearing capacity,
Significantly improve the advantage of pile body horizontal bearing capacity in conjunction with orientation steel fiber reinforced concrete, it is provided that a kind of economical and efficient cast-in-place X-shaped greatly
The stake mould of diameter hollow orientation steel fiber reinforced concrete stake and construction method thereof.
The present invention is achieved through the following technical solutions:
The stake mould of a kind of cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake, including the stake mould outer tube being arranged concentrically
With stake mould inner tube, forming a cavity structure between stake mould outer tube and stake mould inner tube, the top of stake mould outer tube and stake mould inner tube leads to
Crossing dismountable flange dish to be connected with the vibration head of piling machine, the bottom of stake mould outer tube and stake mould inner tube connects flap valve shoe, stake
The top of mould outer tube is provided with the charging aperture communicated with cavity structure, it is characterised in that: also include DC power control device, described
Stake mould inner tube exterior bottom is to 1/5 ~ 1/2 height pre-embossed spiral groove, vertical to top pre-embossed two above spiral groove
Linear groove, DC coil winding screw connected in star is arranged, and the both positive and negative polarity wiring of DC coil is drawn by linear groove
Go out and be connected with DC power control device.
The stake mould of described cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake, described stake mould outer tube is X-type stake
Mould outer tube, described stake mould inner tube is circular stake mould inner tube.
The stake mould of described cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake, described flap valve shoe has and stake
The X-shaped that die sleeve pipe outer contour shape is identical, including lock shaft and flap valve.
The stake mould of described cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake, coats in described spiral groove
One layer of self-drying type bonding insullac.
The stake mould of described cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake, the described DC coil number of turn is 500
~ 600。
The construction method of a kind of cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake, comprises the following steps,
(1) by place in the pile driving position specified to stake mould and piling machine, before pile sinking, flap valve shoe is closed；
(2) Vibration on Start-up piling machine, drives the stake mould of the cavity structure being attached thereto slowly to sink to ground, and often sinks
1.5 ~ 2.5m vibration staying 0.5 ~ 1.5min, flap valve shoe is kept closed under soil pressure effect, under protection cavity structure stake mould
It is sink to projected depth；
(3) injected in stake mould cavity structure by charging aperture the most a certain amount of by Binder Materials, sand, stone, efficiently subtract
The steel fiber reinforced concrete that water preparation and steel fibre are mixed with in known ratio；
(4) connecting DC power control device, the DC coil being wound around in spiral groove energising, at stake mould cavity structure
Interior generation magnetic field, the magnetic field in the range of cavity is the most consistent with stake；
(5) Vibration on Start-up head upwards tube drawing, under vibrational state, steel fiber reinforced concrete viscosity resistance is less, and steel fibre is at magnetic
Under field action, arragement direction tends to consistent with magnetic direction, reaches directional profile state；
(6) repetition step (3) is to (5), until stake mould upwards extracts ground, forms cast-in-place X-shaped large-diameter hollow orientation steel
Fiber concrete stake.
The construction method of described cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake, steel fiber reinforced concrete is selected
Length of steel fiber is 8 ~ 10cm, a diameter of 1.0 ~ 1.5mm.
The construction method of described cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake, vibration pipe-drawing pulls out speed is
0.5-1.2m/min, and every tube drawing 1m vibration staying 1.5min.
The construction method of described cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake, DC power control device is opened
After, the DC current in DC coil is 20-60A, and can produce magnetic induction in cavity structure is 20 × 10-3T～60 ×
10-3The magnetic field of T.
Advantages of the present invention and effect are:
(1) present invention uses the method that cast-in-place steel fiber reinforced concrete mixture is applied directional magnetic field, utilizes magnetic induction to imitate
Steel fibre purpose of directional profile in concrete should be reached, overcome what existing steel fiber reinforced concrete moulding process was caused
The random random distribution of steel fibre, effective utilization ratio are low and significant portion steel fibre can not play lacking of due shear resistance
Point；
(2) it is X-shaped due to cross section outline, there is compared with traditional circular cross-section bigger girth, therefore have
Higher outer frictional resistance；Owing to there is stake core soil, therefore stake inwall also has the effect of inner frictional resistance, and this pile-type utilizes horizontal stroke simultaneously
Cross section special-shaped effect and the raising effect to frictional force in side-pile of the stake core soil, be effectively improved vertical bearing capacity；
(3) the orientation steel fibre X-shaped large-diameter hollow pile that the stake mould provided in the present invention and construction method pour, its pile body
The steel fibre X-shaped large-diameter hollow pile that the existing method of horizontal bearing force rate pours improves 45% ~ 90%, or saving reaches identical stake
Steel fibre 20% ~ 50% needed for body horizontal bearing capacity；
(4) cast-in-place X-shaped large-diameter hollow concrete pile is improved, after using orientation instead steel fiber reinforced concrete pouring
Its horizontal bearing capacity is greatly improved, and can significantly expand application model as the pile foundation of skyscraper, bridge, pattern foundation pit supporting structure etc.
Enclose.
Accompanying drawing illustrates:
Fig. 1 is the work progress schematic diagram of the present invention；
Fig. 2 is the stake mould schematic diagram of the present invention；
Fig. 3 is the stake mould cross sectional representation of the present invention；
Fig. 4 is the power supply schematic diagram of the present invention；
In figure, 1 is vibration head, and 2 is detachable ring flange, and 3 is charging aperture, and 4 is X-type stake mould outer tube, and 5 is circular stake mould
Inner tube, 6 is the both positive and negative polarity wiring drawn at the linear type line of rabbet joint, and 7 is DC coil, and 8 is flap valve shoe, and 9 is DC source control
Device processed, 10 is current adjusting knob, and 11 is on and off switch.
Detailed description of the invention
Below in conjunction with the accompanying drawings technical scheme is described in further details.
As in figure 2 it is shown, the stake mould of cast-in-place X shape large-diameter hollow orientation steel fiber reinforced concrete stake, by X-type stake mould outer tube 4 He
Circular stake mould inner tube 5 forms concentric tubes cavity structure, and stake mould top is carried out even with vibration head 1 by detachable ring flange 2
Connect, bottom stake mould, connect flap valve shoe 8；The spiral that circular stake mould inner tube 5 exterior bottom is enclosed to 1/2 height pre-embossed 500 ~ 600
Connected in star, 1/2 height is to two linear grooves of top pre-embossed；DC coil 7 is wound in spiral groove, is glued by self-drying type
Junction isolation paint forms firm connection with groove, and one layer of self-drying type covering insullac of overlying is as protective layer, its both positive and negative polarity wiring 6
Drawn by linear groove and be connected with DC power control device 9；DC power control device 9 is prior art, including power supply
Switch 11 and current adjusting knob 10；On and off switch 11 controls whether logical unidirectional current, DC adjustment knob 10 in stake loft circle 7
For controlling led to galvanic size of current.
As it is shown in figure 1, the construction method of the cast-in-place X shape large-diameter hollow orientation steel fiber reinforced concrete stake of the present invention, including
Following steps:
(1) by place in the pile driving position specified, by flap valve stake before pile sinking to stake mould and the piling machine of pile tip with glide lamellae
Boots 8 close；
(2) Vibration on Start-up piling machine vibration head 1, drives the cavity structure stake mould that is attached thereto slowly to sink to ground, and often
Sinking 2.0m vibration staying 1min, flap valve shoe 8 is kept closed under soil pressure effect, under protection stake mould cavity structure stake mould
It is sink to projected depth；
(3) inject the most a certain amount of by Binder Materials, sand, stone, high efficiency water reducing agent in cavity structure by charging aperture 3
The steel fiber reinforced concrete being mixed with in known ratio with steel fibre, above-mentioned steel fiber reinforced concrete, mainly by Binder Materials, sand,
Stone, water reducer and steel fibre mixing are prepared；The a length of 8-10cm of steel fibre, a diameter of 1.0-1.5cm.It is preferably made
Standby operating process is: load weighted Binder Materials, sand, stone is put into blender siccative and is stirred, puts into the most while stirring
Whole load weighted steel fibres, to stirring, add load weighted mixing water and water reducer (such as high efficiency water reducing agent), continue
Stirring 3min～5min, controls the slump of steel fiber reinforced concrete mixture in the range of 100mm～150mm, in order to reduce and mix
Compound viscosity resistance；
(4) opening DC power supply switch 11, the DC coil 7 being wound around in circular stake mould inner tube 5 spiral groove is energized,
Controlling the size of current in DC coil by current adjusting knob 10 is 20 ~ 60, produces magnetic strength in stake mould cavity structure
Answering intensity is 10 × 10-3T～50 × 10-3The magnetic field of T, its direction in the range of cavity is the most consistent with stake；
(5) Vibration on Start-up head upwards tube drawing, above pulling out speed is 0.5-1.2m/min, and every tube drawing 1m vibration staying 1.5min.?
Under vibrational state, steel fiber reinforced concrete viscosity resistance is less, and steel fibre arragement direction under the action of a magnetic field tends to and magnetic direction one
Cause, reach directional profile state, during tube drawing, ensure that stake mould inner concrete surface is higher than stake mould bottom level 2m；
(6) repetition step (3) is to (5), until stake mould upwards extracts ground, forms cast-in-place X shape large-diameter hollow orientation
Steel fiber reinforced concrete stake.
Described bonding insullac and covering insullac are self-drying type insullac, and temperature classification is E level, and coating layer thickness is equal
For 1mm.
Flap valve shoe described in step (1) has the X-shaped identical with stake die sleeve pipe outer contour shape, by lock shaft and flap valve group
Become；It is owing to the left and right of soil pressure is kept closed that flap valve shoe sinks to ground at stake mould, when stake mould extracts ground due to
The Gravitative Loads of steel fiber reinforced concrete will automatically turn on；
The steel fiber reinforced concrete of the preparation described in step (3), the length of steel fiber of selection is 8 ~ 10cm, a diameter of 1.0 ~
1.5mm.Its preferred preparation manipulation process is: load weighted Binder Materials, sand, stone are put into blender siccative and stirred, so
After put into whole load weighted steel fibre while stirring to stirring, add load weighted mixing water and high efficiency water reducing agent,
Continue stirring 3min～5min, control the steel fiber reinforced concrete mixture slump in the range of 100mm～150mm, in order to reduce
Mixture viscosity resistance；
The known ratio preparing steel fiber reinforced concrete described in step (3) can from " steel fiber reinforced concrete structure design with
Construction regulations " (CECS 38-1992) and " steel fiber reinforced concrete " (JG/T3064-1999) learns；
DC source described in step (4) is provided by special high-power DC power supply, and maximum supply voltage is 380V.Connecing
After logical DC source, the electric current in DC coil is about 20 ~ 60 peaces, and the magnetic induction produced outside inner sleeve is 20
×10-3T～60 × 10-3The magnetic field of T, magnetic direction is axial approximately along pile body.During upwards tube drawing, cavity structure
Magnetic field is upper to be moved, so that steel fibre all reaches directional profile state in whole pile body length range；
The internal diameter of the cast-in-place X shape large-diameter hollow the ultimately formed orientation steel fiber reinforced concrete stake described in step (6) is
0.5 ~ 0.8m, outsourcing circular diameter is 1.5 ~ 2.0m, and pile body greatest length is up to 30m.
Claims (8)
1. the construction method of a cast-in-place X-shaped large-diameter hollow orientation steel fiber reinforced concrete stake, it is characterised in that: include following step
Suddenly,
(1) by place in the pile driving position specified to stake mould and piling machine, before pile sinking, flap valve shoe is closed；
Described stake mould includes stake mould outer tube and the stake mould inner tube being arranged concentrically, and forms one between stake mould outer tube and stake mould inner tube
Cavity structure, stake mould outer tube is connected with the vibration head of piling machine by dismountable flange dish with the top of stake mould inner tube, outside stake mould
The bottom of pipe and stake mould inner tube connects has flap valve shoe, the top of stake mould outer tube to be provided with the charging aperture communicated with cavity structure,
Also including DC power control device, described stake mould inner tube exterior bottom to 1/5 ~ 1/2 height pre-embossed spiral groove, spiral type is recessed
To two vertical lines connected in stars of top pre-embossed above groove, DC coil winding screw connected in star is arranged, and DC coil is just
Negative terminal is drawn by linear groove and is connected with DC power control device；
(2) Vibration on Start-up piling machine, drives the stake mould of cavity structure being attached thereto slowly to sink to ground, and often sink 1.5 ~
2.5m vibration staying 0.5 ~ 1.5min, flap valve shoe is kept closed under soil pressure effect, and protection cavity structure stake mould sinks down into
Projected depth；
(3) it is uniformly injected into a certain amount of by Binder Materials, sand, stone, high efficiency water reducing agent in stake mould cavity structure by charging aperture
The steel fiber reinforced concrete being mixed with in known ratio with steel fibre；
(4) DC power control device is connected, the DC coil being wound around in spiral groove energising, produce in stake mould cavity structure
Magnetisation field, the magnetic field in the range of cavity is the most consistent with stake；
(5) Vibration on Start-up head upwards tube drawing, under vibrational state, steel fiber reinforced concrete viscosity resistance is less, and steel fibre is made in magnetic field
Tend to consistent with magnetic direction with lower arragement direction, reach directional profile state；
(6) repetition step (3) is to (5), until stake mould upwards extracts ground, forms cast-in-place X shape large-diameter hollow orientation steel fine
Dimension concrete-pile.
The construction method of cast-in-place X-shaped large-diameter hollow the most as claimed in claim 1 orientation steel fiber reinforced concrete stake, its feature exists
In: described stake mould outer tube is X-type stake mould outer tube, and described stake mould inner tube is circular stake mould inner tube.
The construction method of cast-in-place X-shaped large-diameter hollow the most as claimed in claim 2 orientation steel fiber reinforced concrete stake, its feature exists
In: described flap valve shoe has the X-shaped identical with stake die sleeve pipe outer contour shape, including lock shaft and flap valve.
The construction method of cast-in-place X-shaped large-diameter hollow the most as claimed in claim 3 orientation steel fiber reinforced concrete stake, its feature exists
In: coat one layer of self-drying type bonding insullac in described spiral groove.
The construction method of cast-in-place X-shaped large-diameter hollow the most as claimed in claim 4 orientation steel fiber reinforced concrete stake, its feature exists
In: the described DC coil number of turn is 500 ~ 600.
The construction method of cast-in-place X-shaped large-diameter hollow the most as claimed in claim 1 orientation steel fiber reinforced concrete stake, its feature exists
In: the length of steel fiber that steel fiber reinforced concrete is selected is 8 ~ 10cm, a diameter of 1.0 ~ 1.5mm.
The construction method of cast-in-place X-shaped large-diameter hollow the most as claimed in claim 1 orientation steel fiber reinforced concrete stake, its feature exists
In: pulling out speed on vibration pipe-drawing is 0.5-1.2m/min, and every tube drawing 1m vibration staying 1.5min.
The construction method of cast-in-place X-shaped large-diameter hollow the most as claimed in claim 1 orientation steel fiber reinforced concrete stake, its feature exists
In: after DC power control device is opened, the DC current in DC coil is 20-60A, can produce magnetic induction strong in cavity structure
Degree is 20 × 10-3T～60 × 10-3The magnetic field of T.
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| CN106194030B (en) * | 2016-08-30 | 2018-07-03 | 昆明良工桩机制造有限公司 | A kind of double power head long spire rotation drill machine with casing and the method using its bored pile |
| CN110387878B (en) * | 2019-08-02 | 2021-07-13 | 绍兴市上虞舜江管桩有限公司 | Preparation process of inner-layer permeation-resistant corrosion-resistant concrete prefabricated square pile |
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