CN106149745A - A kind of truss type steel tube grouting pile basis and construction method thereof - Google Patents
A kind of truss type steel tube grouting pile basis and construction method thereof Download PDFInfo
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- CN106149745A CN106149745A CN201610716048.1A CN201610716048A CN106149745A CN 106149745 A CN106149745 A CN 106149745A CN 201610716048 A CN201610716048 A CN 201610716048A CN 106149745 A CN106149745 A CN 106149745A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/16—Foundations formed of separate piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
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Abstract
The present invention relates to pile foundation engineering technical field, especially a kind of truss type steel tube grouting pile basis and construction method thereof.The pile foundation of the present invention includes one and more than one unit pile foundation, each unit pile foundation is made up of four vertical stakes stood in Rock And Soil, it is on foursquare four angles that every vertical stake lays respectively at level cross-sectionn, it is connected with each other with two taper piles between the adjacent vertical stake on square limit, two taper piles are X shape, and two taper piles intersect but its axial line is non-intersect；The foursquare tie-beam of top layout of four vertical stakes, vertical stake, taper pile and tie-beam are interconnected to constitute truss structure；Taper pile is not vertical with vertical stake, but acutangulates or obtuse angle；Present invention additionally comprises the construction method of pile foundation.It can strengthen integral rigidity between pile foundation, improves pile foundation vertical bearing capacity and horizontal shear strength, reduces foundation uneven settlement, compared with stake pile foundation form straight with routine, has that short construction period, construction costs be low, the advantage of easy construction.
Description
Technical field
The present invention relates to pile foundation engineering technical field, especially relate to a kind of truss type steel tube grouting pile basis and execute
Work method.
Background technology
In architectural engineering, basis can be divided into deep foundation and shallow foundation by arranging the degree of depth, and deep foundation includes pile foundation, open caisson base
Plinth, diaphram wall etc., shallow foundation includes strip footing, box foundation, raft foundation etc..In deep foundation, due to pile foundation energy
Different pile-type and construction method can be selected, along with economy and the development of capital construction, stake according to strata condition, load situation
Basis also becomes especially upper load in various type of foundation and uses one of most form time bigger, and pile foundation engineering is in industry
Use more and more wider with the field such as civil buildings, bridge, harbour, municipal administration, highway, railway, city underground, hazards control
General, in heavy construction, the expense on basis is sometimes up to the 25%～35% of civil engineering total cost, therefore, rationally selects pile-type to go forward side by side
Row pile foundation optimizes, to ensureing engineering safety, economy, the most significant.
Pile foundation, from the timber of more than 7000 years and stone mar, develops into present concrete-pile and reinforced concrete pile, especially
In the last thirty years, pile foundation engineering all achieves huge at aspects such as pile foundation material, piling machinery, construction, pile measurement
Achieving, the mechanization of pile foundation, automatization, the level of informatization improve constantly, and new pile-type, new engineering method also continue to bring out.
The classification of pile foundation can, the stressing conditions of stake, power mode, pile shaft material long by the diameter of pile foundation, stake, pile side
Method, pore-forming equipment etc. are classified.Mini pile, Small Diameter Pile, large diameter pile, super-large diameter stake can be divided into by the classification of stake diameter；
Stub, long stake, ultra-long pile can be divided into by the long classification of stake；Compressive pile, uplift pile, anti-lateral thrust can be divided into by the stressing conditions of stake
Stake；Artificial digging pile, mechanical hole building stake can be divided into by construction power；Timber, concrete-pile, reinforcing bar can be divided into mixed by pile foundation material
Solidifying soil stake, piling bar, steel-pipe pile etc.；Can be divided into prefabricated pile and bored concrete pile by construction method, wherein bored concrete pile includes using various side
Method carries out pore-forming at the construction field (site), then carries out filling concrete pile.Be segmented into non-Squeezing Soil Pile by pile making method, part is squeezed
Soil stake and Squeezing Soil Pile three class, the most non-Squeezing Soil Pile mainly includes dry working system cast-in-situ bored pile, dry working system manually digging hole perfusion
Stake, mud off method cast-in-situ bored pile, sleeve protection method of pipe wall cast-in-situ bored pile etc.；Part Squeezing Soil Pile mainly includes that long screw auger pressure deposited fills
Note stake, Punching Borehole Cast-in-place Concrete Pile, the squeezed bored concrete pile of boring, stirring strength core stake, prebored hole is squeezed into or Static Pressure Precast Piles, squeezes into or static pressure type
Uncovered steel-pipe pile, prestressing concrete hollow pile, H profile steel stake etc.；Squeezing Soil Pile mainly includes that driven cast-in-place pile, immersed tube ram and expands perfusion
Stake, squeeze into or Static Pressure Precast Piles, remain silent prestressing concrete hollow pile and closed steel pile tube etc..
The most conventional pile foundation type mainly has cast-in-situ bored pile, long screw auger pressure deposited bored concrete pile, Punching Borehole Cast-in-place Concrete Pile, excavated by manual work
Hole stake, driven cast-in-place pile, squeeze into or Static Pressure Precast Piles, compacted bearing disk pile, steel-pipe pile etc.；Also it is used for basement process, as
High-pressure rotary jet grouting pile, deep-mixed pile, powder-spray pile etc..In engineering construction, Pile Foundations Design becomes straight stake, and pile foundation bears top-out lotus
The form carried mainly has two kinds, and one is that single pile single-column bears top-out load, and another kind of form is pile foundation and cushion cap to be connected
It is connected together and bears upper load, but this base form has the disadvantage that
(1) current conventional straight stake pile foundation, is separate individuality between pile foundation, and pile foundation bottom cannot connect into one
Individual entirety so that between pile foundation, integral rigidity is little, easily makes pile foundation unbalance stress, under the vertical uniform load q of top under horizontal loading
Easily there is failure by shear in pile foundation, when pile-base supporting layer is weak soil, under vertical load, pile foundation easily occurs punching failure, causes base
Plinth differential settlement or cause foundation failure to cause top-out structure crack, tilt or top-out structure is occurred broken
Bad.
(2) bearing capacity of pile foundation is made up of side friction and bottom bearing, and when pile-base supporting layer is positioned at soil layer, pile foundation holds
Load power is based on side friction, and bottom bearing proportion is little, and bearing capacity of pile foundation to be improved only adds timber pile footpath or increase stake is long, this
Sample makes pile foundation concrete square amount increase.Owing between pile foundation being all the most isolated individuality, under same formation, stake to be improved
Base single pile stiffness and the stability of pile foundation, raising pile foundation vertical and horizontal loading bearing capacity, only add timber pile footpath or increase stake
Long, so can cause construction costs increase, claim for eot.
(3) due to the limitation of current aseptic technic after ordinary steel pile tube is driven underground, steel-pipe pile is easily subject to subsoil water, soil
The corrosion of earth, shortens the service life of pile foundation, so that top-out is affected safely.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of truss type steel tube grouting pile is basic and executes
Work method, this truss type steel tube grouting pile basis by pile foundation and pile foundation, pile foundation and tie-beam connect into one stable whole
Body structure, can strengthen integral rigidity between pile foundation, improves pile foundation vertical bearing capacity and horizontal shear strength, reduces basis uneven
Even sedimentation, compared with stake pile foundation form straight with routine, has that short construction period, construction costs be low, the advantage of easy construction.
Technical scheme:
A kind of truss type steel tube grouting pile basis, including one and more than one unit pile foundation, each unit pile foundation by
Vertical stake (straight stake) composition that four are stood in Rock And Soil, it is foursquare four that every vertical stake lays respectively at level cross-sectionn
On angle, being connected with each other with two taper piles between the adjacent vertical stake on square limit, two taper piles are X shape, and two taper piles intersect but its axle
Heart line is non-intersect；The foursquare tie-beam of top layout of four vertical stakes, vertical stake, taper pile and tie-beam are interconnected to constitute
Truss structure；Taper pile is not vertical with vertical stake, but acutangulates or obtuse angle.
A diameter of 0.1 meter～1.5 meters of described vertical stake, length 2.0 meters～50 meters.
The diameter of described taper pile 0.1 meter～1.5 meters, length 2.0 meters～50 meters.
Described vertical stake and taper pile are made up of the cement mortar in steel pipe, steel pipe and the concrete outside steel pipe, diameter of steel tube
It is 2 centimetres～80 centimetres, length 2.3 meters～50.3 meters.
Described tie-beam is made up of reinforcing bar and concrete, and the cross section of tie-beam is rectangle, its width be 0.2 meter～
1.6 meters, height is 0.2 meter～1.8 meters, main muscle diameter 10～32 millimeters in tie-beam reinforcing bar, the main muscle number of plies 1 layer～6 layers, main muscle
Every layer of radical 1～16, tie-beam concrete grade C25～C45.
In unit pile foundation, the centre-to-centre spacing along the adjacent two vertical stakes on the square limit of level cross-sectionn is 1 meter 8 meters.
When vertical stake and when being relatively large in diameter more than 0.6 meter of taper pile, can be by several diameters 2 centimetres～the steel pipe of 5 centimetres
Mix muscle of putting more energy into make caged and put into hole, in hole, then put into rubble, sand, finally carry out mortar depositing construction pile.
When vertical stake and when being relatively large in diameter more than 0.6 meter of taper pile, use the diameter single steel pipe more than 0.5 meter as note
During slurry pipe, all offer a number of injected hole in the top of Grouting Pipe, middle part, bottom, in hole, then put into rubble, sand,
Finally carry out mortar depositing construction pile.
The construction method on a kind of truss type steel tube grouting pile basis, comprises the steps:
Step one, pile foundation positions, carries out the preparation before pore-forming；Carry out construction lofting according to design drawing, make each
Individual vertical stake and the position of taper pile；
Step 2, vertical stake holes pore-forming, select pore-forming mode according to the strata condition of Rock And Soil；Choose a unit pile foundation position
Put, a diameter of 0.1 meter～1.5 meters of vertical stake, length 2.0 meters～50 meters；Determine drill bit of drilling machine diameter 0.1 used by vertical stake holes
1.5 meters of rice, hole depth 2.0 meters 50 meters；Check sediment at the bottom of hole after pore-forming, sediment at the bottom of hole is cleaned out with drawing slag cylinder；
Step 3, waters vertical pile concrete, first puts into a steel pipe in vertical stake holes center, diameter of steel tube be 2 centimetres～
80 centimetres, length 2.3 meters～50.3 meters, injected hole, injected hole diameter 0.3 centimetre～2 centimetres, injected hole are arranged in the lower end of steel pipe
Steel pipe is the most uniformly arranged in juxtaposition 10 50 row, is 6 centimetres with the spacing of in string two adjacent injected holes, each column slip casting
Hole number is 10 50, from outer T-shaped plug the most beyond the Great Wall on injected hole；Conventional ratio is inserted between steel pipe and vertical stake holes wall
The rubble of example mixing and medium coarse sand, the grating of rubble 1 centimetre～3 centimetres；Injecting cement mortar in steel pipe, cement is common silicic acid
Salt cement, the weight ratio of cement mortar is: water: cement=0.4～0.6:0.4～0.6；Slip casting for the first time uses static pressure grouting side
Formula, grouting pressure 0.1Mpa～1.5Mpa, until cement mortar diffuses out vertical stake holes mouth；
Step 4, taper pile hole pore-forming, reserve perforate direction, taper pile hole and two ends vertical stake incision according to the orientation of taper pile
0.02 meter～0.5 meter of pore-forming, the diameter of taper pile 0.1 meter 1.5 meters, length 2.0 meters 50 meters；Determine drill bit of drilling machine diameter 0.1
1.5 meters of rice, hole length 2.0 meters 50 meters；Taper pile hole pore-forming is after pouring vertical pile concrete 3 hours, carry out in 5 days；Taper pile
Hole is that two vertical stake tops and bottom incision 0.02 meter～0.5 meter get out along the square limit of unit pile foundation level cross section,
Boring another taper pile hole after being drilled to a taper pile hole again, two taper pile holes are X shape, two in X shape taper pile hole intersect but axial line is non-intersect；Become
Check sediment at the bottom of hole behind hole, sediment at the bottom of hole is cleaned out；
Step 5, waters taper pile concrete, first hits exactly in taper pile hole and puts into a steel pipe, diameter of steel tube 2 centimetres～80 centimetres,
Length 2.3 meters～50.3 meters, the lower end layout injected hole of steel pipe, injected hole diameter 0.3 centimetre～2 centimetres, injected hole is at steel pipe
On be the most uniformly arranged in juxtaposition 10 50 row, be 6 centimetres with the spacing of in string two adjacent injected holes, each column injected hole quantity
It it is 10 50, from outer T-shaped plug the most beyond the Great Wall on injected hole；Between steel pipe with taper pile hole wall, insert what conventional ratio mixed
Rubble and medium coarse sand, the grating of rubble 1 centimetre～3 centimetres；Injecting cement mortar in steel pipe, cement is Portland cement,
The weight ratio of cement mortar is: water: cement=0.4～0.6:0.4～0.6；Slip casting for the first time uses static pressure grouting mode, slip casting pressure
Power 0.1Mpa～1.5Mpa, until cement mortar diffuses out taper pile aperture；
In after first time slip casting 2 hours～5 hours of step 6, secondary grouting, vertical stake and taper pile, carry out secondary injection
Slurry, grouting pressure 0.5Mpa～3.5Mpa, grouting pressure starts little, and the later stage strengthens；
Step 7, tie-beam is constructed, is abolished the Grouting Pipe 0.02 that a top divides concrete to expose vertical stake and taper pile top
Rice～0.5 meter；In a unit pile foundation, the line of centres of four vertical stakes is attached the survey of beam on the basis of being constituted square
Amount unwrapping wire, carries out soil excavation by tie-beam rectangular cross section size plus template size, lays the template of tie-beam；Colligation
Reinforcing bar, together with the steel pipe colligation expose the stake top of tie-beam reinforcing bar with vertical stake, taper pile, is attached watering of beam concrete
Building, the cross sectional dimensions of tie-beam is: width is 0.2 meter～1.6 meters, and height is 0.2 meter～1.8 meters, main in tie-beam reinforcing bar
Muscle diameter 10～32 millimeters, the main muscle number of plies 1 layer～6 layers, every layer of radical of main muscle 1～16, tie-beam concrete grade C25～
C45；
Step 8, tie-beam maintenance, tie-beam is carried out natural curing, form removal after maintenance 21 days；Vertical stake, taper pile
Integrally-built underground truss-like pile foundation is formed with tie-beam.
The pore-forming of straight stake and taper pile according to the long situation of strata condition, Pile Diameter and stake, pore-forming mode select manually digging hole,
Luoyang Spade pore-forming or machine drilling pore-forming, pile-driving machine includes that long screw auger drilling machine, rotary drilling boring drill, churning driven enter
Rig, full-sleeve retaining wall boring drill, directional drilling machine, jumbolter.
, pile foundation centre-to-centre spacing long according to strata condition, Pile Diameter and stake and pore-forming technique can select situation, to straight stake and tiltedly
The sequence of construction of stake selects, if rock-soil layer is that clay etc. is difficult to collapse that the diameter of the stratum in hole, straight stake and taper pile is less, stake is long
In the case of shorter, take certain measure, after straight stake pore-forming, and then carry out the pore-forming of taper pile, then carry out the peace of steel pipe
Put and work with rubble, the input of sand and slip casting.
The present invention has a following beneficial effect:
(1) it is connected between pile foundation with pile foundation and after stake top is connected by tie-beam, forms truss structure, anti-horizontal loading
Ability improves, and integral rigidity is big, and under horizontal loading, failure by shear is less likely to occur pile foundation, favourable to base fixed, Ke Yizeng
Strong Antiseismic building performance.Truss structure can fully save material, alleviates construction weight.
(2) truss-like pile foundation connects into an entirety, under the vertical uniform load q of top pile foundation uniform force, base can be reduced
The safety of plinth differential settlement, beneficially superstructure is with stable.
(3) taper pile interconnection, and interact in addition to producing a part of side friction, taper pile vertically contacts with Rock And Soil
Area is multiplied, and therefore bottom bearing also increases, and bottom bearing and straight stake that taper pile increases cooperatively undertake upper load effect,
Pile foundation generation punching failure can be avoided simultaneously.
(4) use steel pipe grouting pile, owing to steel pipe is wrapped up by cement mortar, steel pipe can be prevented by subsoil water and the corruption of soil
Erosion, extend steel-pipe pile service life；Due to filling, the crowd in-out effects of serosity, making a surrounding soil compacted, soil strength is significantly
Degree improves, and pile-end soil body is squeezed simultaneously, and side friction and the bottom bearing of pile foundation are all improved.
(5) stability in the large on truss type steel tube grouting pile basis is good, good rigidity, bearing capacity strong, and the straight stake of routine sets
Meter is compared, and under same formation, can improve STIFFNESS BOTH THE BASE, pile foundation stability, improves pile foundation vertical and horizontal loading carrying energy
Power, be not added with timber pile footpath or increase stake long in the case of, can the reduction of erection time, reduce construction costs, simultaneously arrangement of pile foundation flexibly, execute
Work is convenient.
Accompanying drawing explanation
Fig. 1 is that in the embodiment of the present invention, straight stake, taper pile and the tie-beam on truss type steel tube grouting pile basis arrange schematic diagram
(vertical view).
Fig. 2 is to arrange schematic diagram along A A or the straight stake of B B section, taper pile and tie-beam in Fig. 1.
In figure: 1. straight stake (vertical stake), 2. taper pile, 3. tie-beam, 4. Rock And Soil.
Detailed description of the invention
Below by specific embodiment, and combine accompanying drawing, the present invention be described in further detail:
Embodiment 1:
It is a kind of truss type steel tube grouting pile basis as shown in Figure 1 and Figure 2, including the straight stake 1 stood in Rock And Soil 4, with directly
The taper pile 2 that stake 1 links together, the top layout tie-beam 3 of straight stake 1, they are interconnected to form one in integrally-built
Underground truss-like pile foundation.The truss-like pile foundation of the present embodiment is made up of four unit pile foundations；Each unit pile foundation is straight by 4
Stake 1 composition, it is on foursquare four angles that every straight stake 1 lays respectively at level cross-sectionn, along square limit adjacent straight stake 1 it
Between being connected with each other in X shape taper pile 2 (two taper piles 2 intersect but its axial line is non-intersect), the top layout square of 4 straight stakes 1
Tie-beam 3, they are interconnected to constitute truss structure；Taper pile 2 is not vertical with straight stake 1, but acutangulates or obtuse angle.
Straight stake 1 is made up of the cement mortar in steel pipe, steel pipe and the concrete outside steel pipe, and a diameter of 0.3 meter of straight stake 1 is long
Spend 12.0 meters；Diameter of steel tube 6 centimetres, length 12.3 meters.
Taper pile 2 is made up of the cement mortar in steel pipe, steel pipe and the concrete outside steel pipe, a diameter of 0.3 meter of taper pile 2, long
Spend 12.9 meters；Diameter of steel tube 4 centimetres, length 10.08 meters.
Tie-beam 3 is made up of reinforcing bar and concrete, and the cross section of tie-beam 3 is rectangle, and length 0.6 meter, height are 0.5
Rice, the reinforcing bar of tie-beam 3 is made up of main muscle, main muscle diameter 16 millimeters, the main muscle number of plies 3 layers, every layer of radical of main muscle 6；Concrete
Label C30, commodity in use concrete.
In unit pile foundation, the centre-to-centre spacing along the adjacent two straight stakes 1 on the square limit of level cross-sectionn is 5 meters.
In the present embodiment, engineering present position Rock And Soil 4 strata condition is from ground from top to down: miscellaneous fill, thickness
1.2 rice；Clay, thickness 6 meters；Silty clay, thickness 3 meters；Silty sand ground, thickness 2.8 meters；, medium sand, thickness 15 meters；Pile foundation holding force
Layer is positioned at middle layer of sand.
The construction method on a kind of truss type steel tube grouting pile basis, comprises the steps:
Step one, pile foundation positions, carries out the preparation before pore-forming；Carry out construction lofting according to design drawing, make each
Individual straight stake 1 and the position of taper pile 2, carry out construction lofting according to design drawing, releases construction axis by measuring instruments such as total powerstations,
Setting-out makes each straight stake 1 and the position of taper pile 2 and at construction stake sample chart display, calculates the blowing angle of taper pile；To measure
Reinforcing bar is squeezed on the ground as mark in straight stake 1 center of setting-out；
Step 2, straight stake holes pore-forming, rock-soil layer residing for straight stake 1 and the pile body section of taper pile 2 and supporting course is medium sand,
Easily caving in, pore-forming uses mud off slewing drilling machine to become well format；Choose a unit pile foundation position, straight stake 1 diameter 0.3 meter, complete
Long 12 meters, with 0.3 meter of mud off slewing drilling machine bit bore of diameter 12 meters；Sediment at the bottom of hole is checked, to sediment at the bottom of hole after pore-forming
Clean out with drawing slag cylinder；
Step 3, waters straight stake 1 concrete, first puts into a steel pipe, diameter of steel tube 6 centimetres, length in straight stake holes center
12.3 meters, injected hole is arranged in the lower end of steel pipe, injected hole diameter 0.5 centimetre, injected hole cloth the most side by side vertically on steel pipe
Putting 10 row, be 6 centimetres with the spacing of in string two adjacent injected holes, each column injected hole quantity is 10 50, on injected hole from
Outer T-shaped plug the most beyond the Great Wall (available drawing pin replacement T-shaped plug curls up two layers of adhesive tape the most outside to be fixed)；In steel pipe and straight stake holes
Rubble and medium coarse sand, the grating of rubble 1 centimetre～3 centimetres of conventional ratio mixing is inserted between wall；Cement is injected in steel pipe
Slurry, cement grade is No. 52.5 Portland cements, and the weight ratio of cement mortar is: water: cement=0.4:0.6；Note for the first time
Slurry uses static pressure grouting mode, and grouting pressure 0.1Mpa～1.5Mpa, until cement mortar diffuses out straight stake holes mouth；
Step 4, taper pile hole pore-forming, reserve perforate direction according to the orientation of taper pile 2, taper pile hole stake straight with two ends 1 is cut
0.02 meter of pore-forming, the diameter of taper pile 2 0.3 meter, a length of 12.9 meters, determine drill bit of drilling machine diameter 0.3 meter, a length of 12.9 meters of hole；
Taper pile hole pore-forming is after watering straight stake 1 concrete 3 hours, carry out in 5 days；Taper pile hole along unit pile foundation level cross section is just
On Quad Sides, two straight stake 1 tops and bottom incision 0.02 meter get out, and bore another taper pile hole, two taper pile holes after being drilled to a taper pile hole again
In X shape, two in X shape taper pile hole intersect but axial line is non-intersect；Check sediment at the bottom of hole after pore-forming, follow sediment pumping is counter at the bottom of hole
Sediment at the bottom of hole is cleaned out by the clear hole of ring；
Step 5, waters taper pile 2 concrete, first puts into a steel pipe, diameter of steel tube 6 centimetres, length in center, taper pile hole
13.2 meters, injected hole is arranged in the lower end of steel pipe, injected hole diameter 0.5 centimetre, injected hole cloth the most side by side vertically on steel pipe
Putting 10 row, be 6 centimetres with the spacing of in string two adjacent injected holes, each column injected hole quantity is 10 50, on injected hole from
(available drawing pin replacement T-shaped plug curls up two layers of adhesive tape the most outside to be fixed outer T-shaped plug the most beyond the Great Wall, cement mortar meeting during slip casting
T-shaped plug or drawing pin are washed open)；Rubble and medium coarse sand, rubble that conventional ratio mixes is inserted between steel pipe with taper pile hole wall
Grating 1 centimetre～3 centimetres；Injecting cement mortar in steel pipe, cement grade is No. 52.5 Portland cements, cement mortar
Weight ratio is: water: cement=0.4:0.6；The employing static pressure grouting mode of slip casting for the first time, grouting pressure 0.1Mpa～1.5Mpa,
Until cement mortar diffuses out taper pile aperture；
Step 6, secondary grouting, in after first time slip casting 2 hours～5 hours of straight stake 1 and taper pile 2, carry out secondary injection
Slurry, grouting pressure 0.5Mpa～3.0Mpa, grouting pressure starts little, and the later stage strengthens；
Step 7, tie-beam 3 is constructed, and abolishes a top and divides concrete to expose straight stake 1 and the Grouting Pipe 0.5 at taper pile 2 top
Rice；The surveying setting-out of beam 3 it is attached on the basis of the line of centres of four straight stakes 1 (a unit pile foundation) is constituted square,
Carry out soil excavation by tie-beam 3 rectangular cross section size plus template size, lay the template of tie-beam 3；Assembling reinforcement,
Together with the steel pipe colligation expose the stake top of tie-beam reinforcing bar with straight stake 1, taper pile 2, it is attached pouring of beam 3 concrete,
The cross sectional dimensions of tie-beam 3 is: width 0.6 meter, height are 0.5 meter, main muscle diameter 16 millimeters in tie-beam reinforcing bar, main muscle layer
Several 3 layers, every layer of radical of main muscle 6, tie-beam 3 concrete grade C30；
Step 8, tie-beam 3 maintenance, tie-beam 3 is carried out natural curing, form removal after maintenance 21 days；Pouring coagulation
After soil, straight stake 1, taper pile 2 and tie-beam 3 form integrally-built underground truss-like pile foundation.
The present embodiment is connected to become an entirety pile foundation and tie-beam, improves integral rigidity and the carrying of pile foundation
Power, foundation uneven settlement can be reduced, the whole employing straight-bar stakes with same formation compared with type pile foundation engineering, it was predicted that
Can reduce stake several 30%, construction costs saving 25%, duration shift to an earlier date 12 days.
Embodiment 2:
In the present embodiment, the structure on truss type steel tube grouting pile basis is with embodiment 1.
Straight stake 1 is made up of the cement mortar in steel pipe, steel pipe and the concrete outside steel pipe, and a diameter of 0.6 meter of straight stake 1 is long
Spend 16.0 meters；Diameter of steel tube 10 centimetres, length 16.3 meters.
Taper pile 2 is made up of the cement mortar in steel pipe, steel pipe and the concrete outside steel pipe, a diameter of 0.6 meter of taper pile 2, long
Spend 17.1 meters；Diameter of steel tube 10 centimetres, length 17.4 meters.
Tie-beam 3 is made up of reinforcing bar and concrete, and the cross section of tie-beam 3 is rectangle, and length 0.8 meter, height are 0.6
Rice, the reinforcing bar of tie-beam 3 is made up of main muscle, main muscle diameter 22 millimeters, the main muscle number of plies 3 layers, every layer of radical of main muscle 7；Concrete
Label C30, commodity in use concrete.
In unit pile foundation, the centre-to-centre spacing along the adjacent two straight stakes 1 on the square limit of level cross-sectionn is 8 meters.
In the present embodiment, the strata condition of Rock And Soil 4 is respectively as follows: clay, thickness 18 meters, lam, thickness 5 from top to bottom
Rice, silty clay, thickness 6 meters, silty sand ground, thickness 5 meters, pile-base supporting layer is positioned at argillic horizon, pile-base supporting layer following soil layer feelings
Condition is also preferable, and hole wall is difficult to cave in.
The construction method on a kind of truss type steel tube grouting pile basis, completes as follows:
Step one, pile foundation positions, carries out the preparation before pore-forming；Carry out construction lofting according to design drawing, make each
Individual straight stake 1 and the position of taper pile 2, carry out construction lofting according to design drawing, releases construction axis by measuring instruments such as total powerstations,
Setting-out makes each straight stake 1 and the position of taper pile 2 and at construction stake sample chart display, calculates the blowing angle of taper pile；To measure
Reinforcing bar is squeezed on the ground as mark in straight stake 1 center of setting-out；
Step 2, straight stake holes pore-forming, argillic horizon residing for straight stake 1 and the pile body section of taper pile 2 and supporting course, pile foundation holding force
The following soil layer situation of layer is also preferable, and hole wall is difficult to cave in, and pore-forming uses long-spiral drilling form；Choose a unit pile foundation position
Put, straight stake 1 diameter 0.6 meter, total length 16 meters, with the long-spiral drilling machine bit bore 16 meters of diameter 0.6 meter；Check at the bottom of hole after pore-forming
Sediment, cleans out with drawing slag cylinder sediment at the bottom of hole；
Step 3, waters straight stake 1 concrete, first puts into a steel pipe, diameter of steel tube 10 centimetres, length in straight stake holes center
16.3 meters, injected hole is arranged in the lower end of steel pipe, injected hole diameter 0.5 centimetre, injected hole cloth the most side by side vertically on steel pipe
Putting 20 row, be 6 centimetres with the spacing of in string two adjacent injected holes, each column injected hole quantity is 10 50, on injected hole from
Outer T-shaped plug the most beyond the Great Wall (available drawing pin replacement T-shaped plug curls up two layers of adhesive tape the most outside to be fixed)；In steel pipe and straight stake holes
Rubble and medium coarse sand, the grating of rubble 1 centimetre～3 centimetres of conventional ratio mixing is inserted between wall；Cement is injected in steel pipe
Slurry, cement grade is No. 52.5 Portland cements, and the weight ratio of cement mortar is: water: cement=0.5:0.5；Note for the first time
Slurry uses static pressure grouting mode, and grouting pressure 0.1Mpa～1.5Mpa, until cement mortar diffuses out straight stake holes mouth；
Step 4, taper pile hole pore-forming, reserve perforate direction according to the orientation of taper pile 2, taper pile hole stake straight with two ends 1 is cut
0.05 meter of pore-forming, the diameter of taper pile 2 0.6 meter, a length of 17.1 meters, determine drill bit of drilling machine diameter 0.6 meter, a length of 17.1 meters of hole；
Taper pile hole pore-forming is after watering straight stake 1 concrete 3 hours, carry out in 5 days；Taper pile hole along unit pile foundation level cross section is just
On Quad Sides, two straight stake 1 tops and bottom incision 0.05 meter get out, and bore another taper pile hole, two taper pile holes after being drilled to a taper pile hole again
In X shape, two in X shape taper pile hole intersect but axial line is non-intersect；Check sediment at the bottom of hole after pore-forming, follow sediment pumping is counter at the bottom of hole
Sediment at the bottom of hole is cleaned out by the clear hole of ring；
Step 5, waters taper pile 2 concrete, first puts into a steel pipe, diameter of steel tube 10 centimetres, length in center, taper pile hole
17.4 meters, injected hole is arranged in the lower end of steel pipe, injected hole diameter 0.5 centimetre, injected hole cloth the most side by side vertically on steel pipe
Putting 20 row, be 6 centimetres with the spacing of in string two adjacent injected holes, each column injected hole quantity is 10 50, on injected hole from
Outer T-shaped plug the most beyond the Great Wall (available drawing pin replacement T-shaped plug curls up two layers of adhesive tape the most outside to be fixed)；In steel pipe and taper pile hole
Rubble and medium coarse sand, the grating of rubble 1 centimetre～3 centimetres of conventional ratio mixing is inserted between wall；Cement is injected in steel pipe
Slurry, cement grade is No. 52.5 Portland cements, and the weight ratio of cement mortar is: water: cement=0.5:0.5；Note for the first time
Slurry uses static pressure grouting mode, and grouting pressure 0.1Mpa～1.5Mpa, until cement mortar diffuses out taper pile aperture；
Step 6, secondary grouting, in after first time slip casting 2 hours～5 hours of straight stake 1 and taper pile 2, carry out secondary injection
Slurry, grouting pressure 0.5Mpa～3.5Mpa, grouting pressure starts little, and the later stage strengthens；
Step 7, tie-beam 3 is constructed, and abolishes a top and divides concrete to expose straight stake 1 and the Grouting Pipe 0.5 at taper pile 2 top
Rice；The surveying setting-out of beam 3 it is attached on the basis of the line of centres of four straight stakes 1 (a unit pile foundation) is constituted square,
Carry out soil excavation by tie-beam 3 rectangular cross section size plus template size, lay the template of tie-beam 3；Assembling reinforcement,
Together with the steel pipe colligation expose the stake top of tie-beam reinforcing bar with straight stake 1, taper pile 2, it is attached pouring of beam 3 concrete,
The cross sectional dimensions of tie-beam 3 is: width 0.8 meter, height are 0.6 meter, main muscle diameter 22 millimeters in tie-beam reinforcing bar, main muscle layer
Several 3 layers, every layer of radical of main muscle 7, tie-beam 3 concrete grade C30；
Step 8, tie-beam 3 maintenance, tie-beam 3 is carried out natural curing, form removal after maintenance 21 days；Pouring coagulation
After soil, straight stake 1, taper pile 2 and tie-beam 3 form integrally-built underground truss-like pile foundation.
The present embodiment uses truss type steel tube grouting pile basis, pile foundation and linking beam is connected to become an entirety, carries
The high integral rigidity of pile foundation, is improve bearing capacity of pile foundation by slip casting, is efficiently reduced foundation uneven settlement, with identical
Whole employing straight-bar stakes on stratum compared with type pile foundation engineering, it was predicted that can reduce stake several 32%, construction costs is saved
20%, the duration shifts to an earlier date 15 days.
Claims (8)
1. a truss type steel tube grouting pile basis, is characterized in that: include one and more than one unit pile foundation, each unit
Pile foundation is made up of four vertical stakes stood in Rock And Soil, and it is foursquare four that every vertical stake lays respectively at level cross-sectionn
On angle, being connected with each other with two taper piles between the adjacent vertical stake on square limit, two taper piles are X shape, and two taper piles intersect but its axle
Heart line is non-intersect；The foursquare tie-beam of top layout of four vertical stakes, vertical stake, taper pile and tie-beam are interconnected to constitute
Truss structure；Taper pile is not vertical with vertical stake, but acutangulates or obtuse angle.
A kind of truss type steel tube grouting pile basis the most according to claim 1, is characterized in that: described vertical stake is a diameter of
0.1 meter～1.5 meters, length 2.0 meters～50 meters.
A kind of truss type steel tube grouting pile basis the most according to claim 1, is characterized in that: the diameter of described taper pile
0.1 meter 1.5 meters, length 2.0 meters～50 meters.
A kind of truss type steel tube grouting pile basis the most according to claim 1 and 2, is characterized in that: described vertical stake and
Taper pile is made up of the cement mortar in steel pipe, steel pipe and the concrete outside steel pipe, and diameter of steel tube is 2 centimetres～80 centimetres, length 2.3
Rice～50.3 meters.
A kind of truss type steel tube grouting pile basis the most according to claim 1, is characterized in that: described tie-beam is by reinforcing bar
Forming with concrete, the cross section of tie-beam is rectangle, and its width is 0.2 meter～1.6 meters, and height is 0.2 meter～1.8 meters,
Main muscle diameter 10～32 millimeters in tie-beam reinforcing bar, the main muscle number of plies 1 layer～6 layers, every layer of radical of main muscle 1～16, tie-beam
Concrete grade C25～C45.
A kind of truss type steel tube grouting pile basis the most according to claim 1, is characterized in that: horizontal along level in unit pile foundation
The centre-to-centre spacing of the adjacent two vertical stakes on the square limit in cross section is 1 meter 8 meters.
7. the construction method on the truss type steel tube grouting pile basis described in claim 1, comprises the steps:
Step one, pile foundation positions, carries out the preparation before pore-forming；Carry out construction lofting according to design drawing, make each lead
Vertical stake and the position of taper pile；
Step 2, vertical stake holes pore-forming, select pore-forming mode according to the strata condition of Rock And Soil；Choose a unit pile foundation position,
A diameter of 0.1 meter～1.5 meters of vertical stake, length 2.0 meters～50 meters；Determine drill bit of drilling machine diameter 0.1 meter used by vertical stake holes
1.5 meters, hole depth 2.0 meters 50 meters；Check sediment at the bottom of hole after pore-forming, sediment at the bottom of hole is cleaned out with drawing slag cylinder；
Step 3, waters vertical pile concrete, first puts into a steel pipe in vertical stake holes center, and diameter of steel tube is 2 centimetres～80 lis
Rice, length 2.3 meters～50.3 meters, the lower end layout injected hole of steel pipe, injected hole diameter 0.3 centimetre～2 centimetres, injected hole is at steel
The most uniformly it is arranged in juxtaposition 10 50 row on pipe, is 6 centimetres with the spacing of in string two adjacent injected holes, each column slip casting hole count
Amount is 10 50, from outer T-shaped plug the most beyond the Great Wall on injected hole；Between steel pipe and vertical stake holes wall, insert conventional ratio mix
The rubble closed and medium coarse sand, the grating of rubble 1 centimetre～3 centimetres；Injecting cement mortar in steel pipe, cement is normal silicate water
Mud, the weight ratio of cement mortar is: water: cement=0.4～0.6:0.4～0.6；Slip casting for the first time uses static pressure grouting mode, note
Slurry pressure 0.1Mpa～1.5Mpa, until cement mortar diffuses out vertical stake holes mouth；
Step 4, taper pile hole pore-forming, reserve perforate direction according to the orientation of taper pile, taper pile hole cuts 0.02 meter with two ends vertical stake
～0.5 meter of pore-forming, the diameter of taper pile 0.1 meter 1.5 meters, length 2.0 meters 50 meters；Determine drill bit of drilling machine diameter 0.1 meter 1.5
Rice, hole length 2.0 meters 50 meters；Taper pile hole pore-forming is after pouring vertical pile concrete 3 hours, carry out in 5 days；Taper pile hole is along single
On the square limit of unit's pile foundation level cross section, two vertical stake tops and bottom incision 0.02 meter～0.5 meter get out, and are drilled to one oblique
Boring another taper pile hole after stake holes again, two taper pile holes are X shape, two in X shape taper pile hole intersect but axial line is non-intersect；Check after pore-forming
Sediment at the bottom of hole, cleans out sediment at the bottom of hole the clear hole of sediment Pump breath countercirculate at the bottom of hole；
Step 5, waters taper pile concrete, first puts into a steel pipe, diameter of steel tube 2 centimetres～80 centimetres, length in center, taper pile hole
2.3 meters～50.3 meters, injected hole is arranged in the lower end of steel pipe, and injected hole diameter 0.3 centimetre～2 centimetres, injected hole is edge on steel pipe
Axially uniformly being arranged in juxtaposition 10 50 row, be 6 centimetres with the spacing of in string two adjacent injected holes, each column injected hole quantity is
10 50, from outer T-shaped plug the most beyond the Great Wall on injected hole；That inserts between steel pipe with taper pile hole wall that conventional ratio mixes is broken
Stone and medium coarse sand, the grating of rubble 1 centimetre～3 centimetres；Injecting cement mortar in steel pipe, cement is Portland cement, water
The weight ratio of mud is: water: cement=0.4～0.6:0.4～0.6；Slip casting for the first time uses static pressure grouting mode, grouting pressure
0.1Mpa～1.5Mpa, until cement mortar diffuses out taper pile aperture；
In after first time slip casting 2 hours～5 hours of step 6, secondary grouting, vertical stake and taper pile, carry out secondary grouting,
Grouting pressure 0.5Mpa～3.5Mpa, grouting pressure starts little, and the later stage strengthens；
Step 7, tie-beam construct, abolish the Grouting Pipe 0.02 meter dividing concrete to expose vertical stake and taper pile top in a top～
0.5 meter；In a unit pile foundation, the line of centres of four vertical stakes is attached the measurement of beam and puts on the basis of being constituted square
Line, carries out soil excavation by tie-beam rectangular cross section size plus template size, lays the template of tie-beam；Colligation steel
Muscle, together with the steel pipe colligation expose the stake top of tie-beam reinforcing bar with vertical stake, taper pile, is attached watering of beam concrete
Building, the cross sectional dimensions of tie-beam is: width is 0.2 meter～1.6 meters, and height is 0.2 meter～1.8 meters, main in tie-beam reinforcing bar
Muscle diameter 10～32 millimeters, the main muscle number of plies 1 layer～6 layers, every layer of radical of main muscle 1～16, tie-beam concrete grade C25～
C45；
Step 8, tie-beam maintenance, tie-beam is carried out natural curing, form removal after maintenance 21 days；Vertical stake, taper pile and company
Connect beam and form integrally-built underground truss-like pile foundation.
The construction method on a kind of truss type steel tube grouting pile the most according to claim 7 basis, comprises the steps:
Step one, pile foundation positions, carries out the preparation before pore-forming；Carry out construction lofting according to design drawing, make each lead
Vertical stake and the position of taper pile, carry out construction lofting according to design drawing, releases construction axis, setting-out by measuring instruments such as total powerstations
Make each vertical stake and the position of taper pile and at construction stake sample chart display, calculate the blowing angle of taper pile；By surveying and locating
Vertical pile center squeeze into reinforcing bar on the ground as mark；
Step 2, vertical stake holes pore-forming, rock-soil layer residing for the pile body section of vertical stake and taper pile and supporting course is medium sand, easily
Caving in, pore-forming uses mud off slewing drilling machine to become well format；Choose a unit pile foundation position, vertical stake diameter 0.3 meter, total length
12 meters, with 0.3 meter of mud off slewing drilling machine bit bore of diameter 12 meters；Check sediment at the bottom of hole after pore-forming, sediment at the bottom of hole is used
Draw slag cylinder to clean out；
Step 3, waters vertical pile concrete, first puts into a steel pipe, diameter of steel tube 6 centimetres, length 12.3 in vertical stake holes center
Rice, the lower end layout injected hole of steel pipe, injected hole diameter 0.5 centimetre, injected hole is the most uniformly arranged in juxtaposition 10 on steel pipe
Row, are 6 centimetres with the spacing of in string two adjacent injected holes, and each column injected hole quantity is 10 50, from outer past on injected hole
Drawing pin curls up two layers of adhesive tape the most outside and fixes the most beyond the Great Wall；That inserts between steel pipe with vertical stake holes wall that conventional ratio mixes is broken
Stone and medium coarse sand, the grating of rubble 1 centimetre～3 centimetres；Injecting cement mortar in steel pipe, cement grade is No. 52.5 common silicic acid
Salt cement, the weight ratio of cement mortar is: water: cement=0.4:0.6；Slip casting for the first time uses static pressure grouting mode, grouting pressure
0.1Mpa～1.5Mpa, until cement mortar diffuses out vertical stake holes mouth；
Step 4, taper pile hole pore-forming, reserve perforate direction according to the orientation of taper pile, taper pile hole cuts 0.02 meter with two ends vertical stake
Pore-forming, the diameter of taper pile 0.3 meter, a length of 12.9 meters, determine drill bit of drilling machine diameter 0.3 meter, a length of 12.9 meters of hole；Taper pile hole becomes
Hole is after pouring vertical pile concrete 3 hours, carry out in 5 days；Taper pile hole is the square limit along unit pile foundation level cross section
Upper two vertical stake tops and bottom are cut 0.02 meter and are got out, and bore another taper pile hole after being drilled to a taper pile hole again, and two taper pile holes are X
Shape, two in X shape taper pile hole intersect but axial line is non-intersect；Sediment at the bottom of hole is checked, to sediment Pump breath countercirculate at the bottom of hole after pore-forming
Sediment at the bottom of hole is cleaned out by clear hole；
Step 5, waters taper pile concrete, first hits exactly in taper pile hole and puts into a steel pipe, diameter of steel tube 6 centimetres, length 13.2 meters,
Injected hole, injected hole diameter 0.5 centimetre are arranged in the lower end of steel pipe, and injected hole is the most uniformly arranged in juxtaposition 10 row on steel pipe,
Being 6 centimetres with the spacing of in string two adjacent injected holes, each column injected hole quantity is 10 50, and injected hole is filled in inside from outward
Upper drawing pin curls up two layers of adhesive tape the most outside to be fixed；Insert between steel pipe with taper pile hole wall rubble that conventional ratio mixes and in
Coarse sand, the grating of rubble 1 centimetre～3 centimetres；Injecting cement mortar in steel pipe, cement grade is No. 52.5 normal silicate water
Mud, the weight ratio of cement mortar is: water: cement=0.4:0.6；Slip casting for the first time uses static pressure grouting mode, grouting pressure
0.1Mpa～1.5Mpa, until cement mortar diffuses out taper pile aperture；
In after first time slip casting 2 hours～5 hours of step 6, secondary grouting, vertical stake and taper pile, carry out secondary grouting,
Grouting pressure 0.5Mpa～3.0Mpa, grouting pressure starts little, and the later stage strengthens；
Step 7, tie-beam is constructed, is abolished the Grouting Pipe 0.5 meter dividing concrete to expose vertical stake and taper pile top in a top；With
The line of centres of four vertical stakes in one unit pile foundation is attached the surveying setting-out of beam on the basis of constituting square, by connecting
Beam length square cross-sectional dimension carries out soil excavation plus template size, lays the template of tie-beam；Assembling reinforcement, by tie-beam
Together with the steel pipe colligation that reinforcing bar exposes with the stake top of vertical stake, taper pile, it is attached pouring of beam concrete, the horizontal stroke of tie-beam
Sectional dimension is: width 0.6 meter, height are 0.5 meter, main muscle diameter 16 millimeters in tie-beam reinforcing bar, the main muscle number of plies 3 layers, main muscle
Every layer of radical 6, tie-beam concrete grade C30；
Step 8, tie-beam maintenance, tie-beam is carried out natural curing, form removal after maintenance 21 days；Lead after placing concrete
Vertical stake, taper pile and tie-beam form truss type steel tube grouting pile basis, integrally-built underground.
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| CN111719549A (en) * | 2020-07-06 | 2020-09-29 | 中国石油大学(北京) | Steel pipe cement composite pile and pile forming method and testing method thereof |
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