CN108252290A - The soft thick soil treatment structures and methods of high-strength water-permeable fiber concrete pipe rubble core stake - Google Patents
The soft thick soil treatment structures and methods of high-strength water-permeable fiber concrete pipe rubble core stake Download PDFInfo
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- CN108252290A CN108252290A CN201810103063.8A CN201810103063A CN108252290A CN 108252290 A CN108252290 A CN 108252290A CN 201810103063 A CN201810103063 A CN 201810103063A CN 108252290 A CN108252290 A CN 108252290A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/005—Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- 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
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a kind of soft thick soil treatment structures of high-strength water-permeable fiber concrete pipe rubble core stake, the treatment of soft foundation structure includes high-strength water-permeable fiber concrete pile pile, rubble, soft seepy blind pipe, pervious concrete pile cover, blotter and two-way steel-plastic grid, the rubble is filled in high-strength water-permeable fiber concrete pile pile, the soft seepy blind pipe is located in high-strength water-permeable fiber concrete pile pile, the pervious concrete pile cover is located at the upper end of high-strength water-permeable fiber concrete pile pile, above the pervious concrete pile cover and its it is surrounded by blotter, two-way steel-plastic grid is equipped in the middle and top part of the blotter, filling roadbed soil and roadbed above top layer's two-way steel-plastic grid.New opplication and new technique of the present invention using new material, can realize being effectively treated for soft soil foundation in high quality, and method is simple, excellent effect, greatlys improve soil matrix bearing capacity and greatly shortens the construction period, and saves engineering cost, generates higher economic benefit.
Description
Technical field
The present invention relates to a kind of soft thick soil treatment structures and methods of high-strength water-permeable fiber concrete pipe rubble core stake, belong to
In highway subgrade soft foundation processing technology field.
Background technology
In water system developed regions, soft soil foundation is relatively common, and therefore treatment of soft foundation quality also becomes in highway construction influences
One of project cost and the factor of most critical of Highway subgrade construction mass investigation, in previous roadbed treatment of soft foundation measure, mainly
The method of use has piling prepressing, plastic draining board discharging consolidation, cement mixing pile etc..These methods have certain advantage,
There are some shortcomings.If preloading is that original place base is not processed, the weights such as soil, sandstone, water are loaded directly over,
The soil body is compressed by gravity, the water in soil matrix excludes immediately, and advantage is that method is simple, and processing is convenient, saves money, and lacks
Point is that precompressed is long in time limit, and the soil matrix degree of consolidation is inadequate, and treatment effect reliability is poor.Plastic draining board draining concretion method is soft
The plastic draining board of certain amount and depth is inserted into base processing location, and drain bar is contacted with soil matrix, when soil matrix is by preloading pressure
When, water therein can be discharged to earth's surface by the core plate in plastic strip plate, and pass through sand bedding course and be discharged to other than roadbed range, work as soil matrix
After interior water excludes, that is, realize the effect of consolidation；The major defect of this method is that the preloading time is long, and soil treatment depth has
Limit, soil treatment depth are generally no greater than 15m.Cement mixing pile is a kind of method for reinforcing saturation Soft Clay Foundation,
It is by the use of cement as curing agent, by mechanical agitation, in ground depths by weak soil and cement action of forced stirring, using cement and
Generated a series of physical chemical reaction between weak soil, makes weak soil scleroma into globality, water stability and some strength
High-quality ground.But cement mixing pile is the soil matrix at cement mixing pile stake position to the composite foundation formed after processing soft soil
Intensity is improved, and the soil between pile body, does not change, the water content of undisturbed soil does not reduce.To sum up
It is described, existing technology the problem is that：(1) soft foundation treatment effect is bad.Such as slurry deep mixing pile reinforcing soft soil, only exist
Stake is reinforced at position, and does not reach consolidation effect outside stake range；(2) construction quality is difficult to control.Either cement
Mixing pile or plastic draining board, Construction control difficulty is all very big, such as the cement mortar ratio of cement mixing pile in the construction process
Weight, unit length whitewashing amount, drilling depth, the embedded depth of plastic draining board etc.；(3) prior art post-construction settlement of subgrade
It measures bigger than normal.Existing soft foundation treatment post-construction settlement is in 20cm or so；(4) prior art processing depth is limited, plastic draining
Plate applies in general to the section that weak soil thickness is not more than 15m, and cement deep layer mixing, which reaches 18m constructions, to encounter difficulties, and
High-strength water-permeable fiber concrete rubble core stake maximum processing depth maximum of the present invention is more than 30m, is soft thick soil section composite foundation
Effective pattern of processing.For this reason, it may be necessary to design a kind of new technical solution, comprehensive can overcome it is of the existing technology not
Foot.
Invention content
The present invention is exactly in view of the deficienciess of the prior art, providing a kind of high-strength water-permeable fiber concrete pipe rubble core
The soft thick soil treatment structures and methods of stake, solve the problems, such as of the existing technology, meet actual operation requirements.
To solve the above problems, the technical solution used in the present invention is as follows：
The soft thick soil treatment structure of high-strength water-permeable fiber concrete pipe rubble core stake, the soft thick soil treatment structure packet
Include high-strength water-permeable fiber concrete pile pile, rubble, soft seepy blind pipe, pervious concrete pile cover, blotter and two-way steel-plastic
Grid, the rubble are filled in high-strength water-permeable fiber concrete pile pile, and the soft seepy blind pipe is arranged on described high-strength
In water cellulose concrete tubular pile, the pervious concrete pile cover is arranged on the upper end of the high-strength water-permeable fiber concrete pile pile,
Above the pervious concrete pile cover and its blotter is surrounded by, the blotter middle part and upper part are equipped with two-way
Steel moulds grid, the filling roadbed native and roadbed in top layer's two-way steel-plastic grid top.
As an improvement of the above technical solution, the high-strength water-permeable fiber concrete pile pile includes cylindrical shape pile body, end
Plate and steel hoop are formed, and the end plate is located at the cylindrical shape pile body both ends, and the steel hoop is around the cylindrical shape pile body
Both ends head is set.
As an improvement of the above technical solution, the high-strength water-permeable fiber concrete pile pile, which further includes, is arranged on the circle
Reinforcing bar in tubular pile body, the reinforcing bar include lengthways main steel bar, reinforcing rib and tie hoop, and the lengthways main steel bar and described
Reinforcing rib is provided in cylindrical shape pile body tube wall, and the lengthways main steel bar vertical welding is fixed on the outside of the reinforcing rib,
The tie hoop is looped around the outside of the lengthways main steel bar.
As an improvement of the above technical solution, the soft thick soil treatment of the high-strength water-permeable fiber concrete pipe rubble core stake
The method of structure includes：Step (1) high-strength water-permeable fiber concrete mix-design；Step (2) high-strength water-permeable fiber concrete
Pile pile designs and produces；The construction of step (3) high-strength water-permeable fibre pipe rubble core stake.
As an improvement of the above technical solution, the dispensing of high-strength water-permeable fiber concrete described in step (1) include water,
Cement, aggregate, additive and polypropylene fibre, the cement use P.O42.5 Portland cements, are gone back in the cement
The rubber powder for accounting for cement weight 2%-2.5% is added to, the aggregate uses 10-20mm simple grain grade rubbles, and the additive is mixed
The 3.0%-3.5% for cement weight is measured, the polypropylene fibre length is 5-10mm.
As an improvement of the above technical solution, high-strength water-permeable fiber concrete pile pile described in step (2) designs and produces
Including：The diameter of step (2.1) high-strength water-permeable fiber concrete pile pile and section determine；Step (2.2) high-strength water-permeable fiber mixes
Solidifying soil Pipe pile design and arrangement of reinforcement；Step (2.3) high-strength water-permeable fiber concrete pile pile overhang roll technological forming.
As an improvement of the above technical solution, step (2.3) high-strength water-permeable fiber concrete pile pile overhang roll technological forming packet
It includes：Step (2.31) Making of reinforcement cage：The Making of reinforcement cage is including skeleton moulding bed prepares, reinforcing rib is installed, longitudinal direction is led
The installing and weld of muscle, the installation of tie hoop and welding and skeleton finished product, when Making of reinforcement cage, should control longitudinal master
Muscle spacing, tie hoop spacing and welding point mass, wherein, the spacing tolerance of the lengthways main steel bar no more than 5mm,
Tie hoop spacing tolerance is not more than 10mm and the single pile pile materials total length of tie hoop and theoretical calculation length are inclined
Difference is no more than -100mm；The assembling of step (2.32) template：The assembling of the masterplate includes template internal model coating release agent, installation
Framework of steel reinforcement enters half module, installs cushion block of concrete bar protective layer, combination two panels half module and the placement of cloth lid, wherein the template construct
It is using high-quality steel form, the template at most one per root canal pile saves, and template is composed of two panels semicircle punching block, inner wall light
Sliding impulse- free robustness during the model sheetinstallat, should check thickness of protection tier cushion block, ensure that the distance between reinforcing bar and template are expired
The error range of sufficient thickness of protection tier, thickness of protection tier tolerance be ± 3mm, two panels semicircle punching block seam
It should seal, it must not spillage；Step (2.33) roller suspension process, before the roller suspension process, stiffener cage, which is fixed, to be checked, feeding
It is slowly carried out continuously, the roll-forming in feeding, quiet roller molding is carried out after roll-in, quiet roller molding time should be in 5min, quiet roller
After answer slow machine halt, when shutdown, keeps pipe die not shaken on roll shaft；The health of step (2.34) pile pile：The pile pile
Health using steam curing, under the conditions of 60 DEG C ± 10 DEG C health can be demoulded after 9 hours.
As an improvement of the above technical solution, the construction packet of high-strength water-permeable fibre pipe rubble core stake described in step (3)
It includes：Step (3.1) selection processing section；The construction of step (3.2) high-strength water-permeable fiber concrete rubble core stake；Wherein, it is described
The operational procedure of high-strength water-permeable fibre pipe rubble core stake is：Levelling of the land and construction lofting, pipe pile static-pressure construction, pile pile in-core
Install soft seepy blind pipe, pile pile in-core dress rubble, pile pile block and the construction of pervious concrete pile cover, installation sedimentation plate and
Sedimentation mark is lengthened in follow-up work, lower floor rubble is laid with, is laid with the two-way composite plastic steel grating of lower floor, laying upper strata rubble, in laying
The two-way composite plastic steel grating of layer, subgrade soils are successively constructed；The construction of step (3.2) the high-strength water-permeable fiber concrete rubble core stake
Including：Step (3.21) processing section leveling：Before pipe pile static-pressure, boundary first is drawn to the process range for handling section, then
Carry out clear list processing, the depth of processing is the removings such as surface fertile soil, table soil, turf to be advisable, and form two-way horizontal slope, slope
It spends for 1%-2%, after the completion of clear table, the 6-8 tons of light-duty road rollers in surface is compacted 2-3 times, movement is installed convenient for tube press machine
With the construction of pile pile；Step (3.22) preparation：High-strength water-permeable fiber concrete pile pile is hooked using two-point method or both ends and hung
Method, and drink spike and put down gently in hoisting process, in transportational process should it is strapped, layering stacks and the arrangement that misplaces, no more than 5 layers,
When building-site is stacked, solid smooth place or chock bearing, heap height is selected to be no more than 5 layers；Step (3.23) Static pressure pile driver
In place and leveling：Static pressure pile driver use YZY120 types, pile press machine total weight be 120T, rated power 22KW, specified pile driving pressure
1200KN, piling speed 1.0-3.0m/min, a piling stroke is 150cm.The thick of a fuselage should be carried out after pile press machine is in place
The first segment stake for installing pile top is lifted by crane, stake is promoted at pile chuck, and fed in stake to pile chuck by slightly leveling, and stake is slow
When being reduced to pile top away from ground 30-50cm slowly, pile chuck rises to stake top, and pile holder is tight, then passes through mobile or adjustment stake
Machine makes a vertical centering；Step (3.24) pressing pile construction and connector：After pile top is inserted into stake position, startup pile press machine piling, and with
When with theodolite observation pile body inclining situation, ensure that each of first segment stake is no more than 0.5% to perpendicularity deviation, follow-up stake
Verticality is no more than 1%, and piling speed should be strict controlled in 1-2m/min；When first segment stake top is away from ground 50cm or so,
Lifting the second section stake, then will be upper plus positioning plate using the method pile extension of welding, the pile crown of the front lower section stake of pile extension after alignment
Section stake is hung on lower section pile end plate, by positioning plate that upper and lower staking is straight, and dislocation deviation is not more than 2mm；Upper and lower stake is as having time
Gap all pads firm welding with wedge-shaped iron plate；Welding should be layered during welding, in first symmetrical 6 points of the spot welding of groove surrounding, welding
It is symmetrically carried out by two welders, the welding number of plies must not be less than 2 layers；Dynamic chek compression distance is answered during piling, when reaching design stake
During the elevation of bottom, stop piling；At this point, pile crown should be amputated if above design altitude, the height of pile top after pile crown is amputated
Deviation is ± 5mm；Step (3.25) is inserted into soft seepy blind pipe, filling rubble：After piling, cut off according to designed elevation
Stake top is inserted into soft seepy blind pipe to stake in-core, and the Bottom Altitude of soft seepy blind pipe is higher 40cm than stake bottom elevation after insertion,
Soft seepy blind pipe is maintained at pile pile lumen centers line position as possible.Then rubble is poured into, rubble is continuous grading rubble or list
Grade rubble, rubble clay content ＜ 3%；Step (3.26) pervious concrete pile cover is constructed：After piling, stake top absolute altitude is low
After the completion of leveling absolute altitude 20cm, pile foundation construction, reinforcing bar is placed into pile cover clay model according to pile cover size excavation, trimming in stake top
Mesh sheet after-pouring pervious concrete, the strength grade of pervious concrete pile cover is C15, and the axis of pervious concrete pile cover is inclined
The tolerance of position, planar dimension, crown elevation etc. is respectively ± 15mm, ± 30mm, ± 20mm；Step (3.27) rubble pad
Layer and the modeling grid construction of double-layer double-direction steel：Before blotter construction, should sedimentation plate be installed according to the requirement of design drawing, sunk
Plate drops generally in subgrade cross section direction per at section 3, and every 20 meters of sections, settling the sedimentation pipe on plate should be according to banketing
Situation lengthens in time；Blotter rubble is required totally without clod, clay content or dust content ≯ 3%, and it is two-way that steel moulds grid
Stretching force standard value N ＞ 80KN/m, elongation percentage ＜ 10%；It is laid with upper strata rubble, thickness 20cm, with the light-duty road roller pressings of 6-8t
It is 2 times real, the two-way composite plastic steel grating of lower floor is laid with, then, rubble, thickness 20cm are compacted with the light-duty road rollers of 6-8t layer by layer in laying
2 times, it is laid with the two-way plastic-steel fabric in upper strata；Surcharge preloadings are constructed and waited to step (3.28) subgrade soils：It is completed in tube pile construction laggard
During row Roadbed Soil, filling speed will control in 30cm/d, to reduce the immediate settlement of soil matrix；Subgrade soils and pre- firming are complete
After portion's loading, squeeze time is determined according to settlement observation situation, generally no less than half a year, and monthly sedimentation in continuous 3 months is not
It is considered as subgrade stability during more than 5mm.
Reinforcing rib of the present invention uses spot welding with lengthways main steel bar welding, and welding does not occur main reinforcement burn, overlap
Phenomenon；The tie hoop is all welded in the contact point with the lengthways main steel bar, and overlap and burn does not occur during welding；
High-strength water-permeable fiber concrete pipe pile section segment length of the present invention is 400cm, and reinforcing rib of the present invention is equipped with two-sided welding structure
Reinforcing rib.
Individual layer reinforced mesh is arranged in bottom in pervious concrete pile cover of the present invention.
Compared with prior art, implementation result of the invention is as follows by the present invention：
The present invention is using squeezing into high-strength water-permeable fiber concrete pile pile in Soft Ground section (in pipe after squeezing into
Inner cavity is inserted into soft seepy blind pipe and simultaneously clogs rubble) mode, using the water penetration of pervious concrete, by pile body to soil matrix
Crowd in-out effects and subgrade soils itself preloading compacting etc., make in the water penetration to pipe of concrete inner cavity in soil matrix, then pass through
The soft seepy blind pipe that pile pile inner cavity and interior intracavitary are laid is discharged to other than roadbed range, achievees the effect that soil matrix rapidly solidified；
Wherein, there are three main function of the high-strength water-permeable fiber concrete rubble core pipe stake during the treatment of soft foundation, first, in stake
Consolidate soil matrix and draining by the crowd in-out effects to soil matrix in body process of press in；Second is that after soil matrix consolidation, due to pile pile
Outer wall is coarse, closely connected with the soil body, increases the frictional force of pile pile and the soil body, plays the role of friction pile, more increases soil matrix
Total bearing capacity；Third, the general driving depth of pile pile reaches supporting course, pile pile is supported on supporting course, has both played support
The effect of roadbed, and can effectively reduce total settlement after roadbed work.
The present invention utilizes the new opplication (high-strength water-permeable fiber concrete material is applied to pile pile) of new material and new construction
Technique (high-strength water-permeable fiber concrete pile pile overhang roll construction technology, permeable pile pile soft foundation treatment process), can be real in high quality
Existing soft soil foundation is effectively treated, and method is simple, excellent effect, is not only only capable of greatling improve soil matrix bearing capacity and greatly
It shortens the construction period, additionally it is possible to save engineering cost, generate higher economic benefit.
In addition, being found by comparing, using soft soil foundation of the present invention, Bearing Capacity of Composite Foundation compares cement mixing pile
Processing improves 13%, and the duration shortens 34%, and total settlement is significantly less than other processing modes after roadbed work, saves cost
11.4%.
Description of the drawings
Fig. 1 is high-strength water-permeable fiber concrete pipe rubble core stake treatment of soft foundation structure diagram of the present invention；
Fig. 2 is high-strength water-permeable fiber concrete pipe rubble core stake detail structure chart of the present invention；
Fig. 3 is high-strength water-permeable fiber concrete pile pile cross section structure schematic diagram of the present invention；
Fig. 4 is reinforcing rib cross section structure schematic diagram of the present invention；
Fig. 5 is high-strength water-permeable fiber concrete pile pile roller suspension process technological process of the present invention；
Fig. 6 is the production process figure of framework of steel reinforcement of the present invention；
Fig. 7 is the assembling flow path figure of the template of the present invention；
Fig. 8 is the process chart of high-strength water-permeable fiber concrete pipe rubble core stake of the present invention；
Fig. 9 is single-pile static loading test load-settling amount curve graph of the present invention
Figure 10 is Pile Composite Foundation loading test bearing capacity-settling amount curve graph of the present invention
Weak soil surface settlement amount curve graph between Figure 11 pile piles of the present invention
Specific embodiment
Illustrate present disclosure below in conjunction with specific embodiments.
As illustrated in figures 1 and 8, at for the soft thick soil matrix of high-strength water-permeable fiber concrete pipe rubble core stake of the present invention
Manage structure structure diagram：
The soft thick soil treatment structure of high-strength water-permeable fiber concrete pipe rubble core stake of the present invention, the treatment of soft foundation
Structure includes rubble 20, soft seepy blind pipe 30, pervious concrete pile cover in high-strength water-permeable fiber concrete pile pile 10, official jargon
40th, blotter 50 and two-way steel-plastic grid 60, the rubble 20 are filled in high-strength water-permeable fiber concrete pile pile 10, institute
It states soft seepy blind pipe 30 to be arranged in the high-strength water-permeable fiber concrete pile pile 10, the pervious concrete pile cover 40 is set
It puts above the upper end of the high-strength water-permeable fiber concrete pile pile 10, the pervious concrete pile cover 40 and its is surrounded by
Blotter 50,50 middle part of blotter and upper part are equipped with two-way steel-plastic grid 60, top layer's two-way steel-plastic lattice
60 top filling roadbed native 70 of grid and roadbed 80.
Be further improved ground, the high-strength water-permeable fiber concrete pile pile 10 include cylindrical shape pile body 11, end plate 12 and
Pile protection hoop 13 is formed, and the end plate 12 is located at 11 both ends of cylindrical shape pile body, and the pile protection hoop 13 surround 11 liang of cylindrical shape pile body
End head is set.
Specifically, the high-strength water-permeable fiber concrete pile pile 10, which further includes, is arranged in the cylindrical shape pile body 11
Reinforcing bar, the reinforcing bar include lengthways main steel bar 111, reinforcing rib 112 and tie hoop 113, and the lengthways main steel bar 111 and described
Reinforcing rib 112 is provided in 11 tube wall of cylindrical shape pile body, and 111 vertical welding of the lengthways main steel bar is fixed on the reinforcement
The outside of muscle 112, the tie hoop 113 are looped around the outside of lengthways main steel bar 111.
1st, high-strength water-permeable fiber concrete mix-design
Pervious concrete is a kind of porous light celluar concrete formed by aggregate, cement and water mixing, it is without thin
Aggregate is mutually bonded by coarse aggregate surface cladding a thin layer cement mortar and forms the equally distributed honeycomb structure in hole, therefore had
There is the characteristics of ventilative, permeable, light-weight high heat dissipation, due to its These characteristics, pervious concrete structure is widely used in city road
Drainage pavement in road, the pervious concrete intensity applied to pavement structure is not high, generally between C15-C25.
And in this research, pervious concrete is applied to pile pile, stress is complicated, mainly includes generating during movement
Curved pulling force, the chucking power of static pressure machine pile chuck in the axial static pressure in work progress or hammer force, static pressure work progress,
Horizontal shear during use etc., therefore the pervious concrete intensity requirement used pile pile is higher, need to reach 40MPa with
On；To improve pervious concrete intensity, the intensity requirement of pile pile can be met, pervious concrete need to be coordinated more normal
Rule pervious concrete match ratio does larger adjustment, the principle of adjustment be ensure while concrete crushing strength is improved it is permeable
The porosity and water penetration of concrete.
Raw material used in high-strength water-permeable fiber concrete are Portland cement, simple grain grade coarse aggregate, polypropylene
Fiber, high efficiency water reducing agent, rubber powder.
1.1 the ratio of mud
The ratio of mud be influence concrete strength principal element, in proportion of porous concrete mixture, the ratio of mud it is big
The small intensity and coefficient of permeability for directly affecting pervious concrete, and coefficient of permeability increases with the reduction of the ratio of mud, the ratio of mud
Smaller, the intensity of pervious concrete is higher, and coarse aggregate cannot be wrapped up by cement mortar completely, water penetration increase, but mobility is not
Foot, constructional difficulties.In general, the pervious concrete ratio of mud is generally 0.25-0.40, this high-strength water-permeable fiber concrete is matched
The ratio of mud that composition and division in a proportion uses is 0.28.
1.2 cement and rubber powder
Cement uses P.O42.5 Portland cements, in order to increase concrete strength, also added and accounts for cement weight
The rubber powder of 2%-2.5%.
1.3 aggregate
The particle size and grade of aggregate are one of factors for influencing pervious concrete performance, and the aggregate of continuous grading can
To increase concrete strength, but seepage of water can reduce, and simple grain grade aggregate permeability performance is good but intensity can weaken.Synthesis is examined
Consider various factors, determine that aggregate uses 10-20mm simple grain grade rubbles.
1.4 additive
Using high-performance water reducing agent, it is 150%, 28d pressure resistances that the water-reducing rate of water-reducing agent, which is 26%, 7d compressive strength rates,
Degree is than being 114%, and bleeding rate is than 41%.The volume of additive is the 3.0%-3.5% of cement weight.
1.5 polypropylene fibre
The fiber used is polypropylene fibre, fibre length 5-10mm
1.6 water
Using reference tap water.
1.7 match ratios determine
Through trial, obtain match ratio shown in table 1 and simulate the pervious concrete indices of overhang roll technological forming.
1 high-strength water-permeable fiber concrete match ratio of table
2nd, high-strength water-permeable fiber concrete pile pile designs and produces
The diameter of 2.1 high-strength water-permeable fiber concrete pile piles and section determine
High-strength water-permeable fiber concrete pile pile is hollow cylinder elongate concrete prefabricated components, mainly by cylindrical shape pile body
11st, the compositions such as end plate 12 and steel hoop 13.
The diameter of current prestressed concrete pipe pile for building has 300mm, 400mm, 500mm equal-specifications, according to permeable mixed
The characteristics of solidifying soil, the mechanics situations such as resistance to compression and shearing resistance when considering the prefabricated of pile pile, movement, static pressure and working condition are selected
A diameter of 400mm, pipe thickness 70mm；Pile pile segmental length is 400cm.
2.2 designs and arrangement of reinforcement
The influence factors such as the horizontal shear of static pressure and soil body when comprehensive pile pile cross section, construction, select high-strength water-permeable
The ratio of reinforcement of fiber concrete pile pile, it is determined as 1.2% or so, lengthways main steel bar 111 selects 8 diametersφ12HRB400 reinforcing bars, add
Strengthening tendons 112 useφ16HRB400 reinforcing bars, tie hoop 113 use φb5 cold-drawn low-carbon wires, specific arrangement of reinforcement and pile crown cuff
Artwork (as shown in Figure of description 3 and attached drawing 4).
2.3 overhang roll technological formings
The forming method of pile for prestressed pipe generally uses centrifugal process, but the coagulation penus used in permeable concrete pipe piles
It in no slump concrete, and needs to ensure permeable effect, centrifugal process cement mortar can be flowed on the outside of tube wall in centrifugal process, be caused
Water penetration weakens, while centrifugal forming cannot be guaranteed the density of no slump concrete, cause strength reduction, therefore, permeable coagulation
Native pile pile molding is it is not recommended that using the method centrifuged.
The principle of overhang roll technique is that speed regulating motor drives pipe die to rotate by suspension roller shaft, and the concrete being fed into pipe die exists
Also with rotating together under centrifugal force effect, after the thickness for being fed into concrete material is more than the height of baffle ring, by suspension roller shaft
The tube wall concrete of vertical direction by suspension roller shaft roller pressure, under the collective effect of suspension roller shaft and pipe die inner wall it is closely knit into
Type, overhang roll technique make suitable for dryness concrete plug, and pervious concrete is just suitble to roller suspension process；Wherein, high-strength water-permeable
Fiber concrete pile pile roller suspension process technological process (such as Figure of description 5)
(1) making of skeleton
The production process of framework of steel reinforcement (as shown in Figure of description 6)
During Making of reinforcement cage, 111 spacing of priority control lengthways main steel bar, 113 spacing of tie hoop and pad matter are answered
Amount.The spacing tolerance of lengthways main steel bar 111 is not more than 5mm, and 113 spacing tolerance of tie hoop is not more than 10mm, and spiral shell
It revolves 113 single pile pile materials total length of stirrup and is no more than -100mm with theoretical calculation length variation, reinforcing rib 112 is main with longitudinal direction
Muscle 111 use spot welding, and there is not allowed that main reinforcement burn, overlap phenomena such as；Tie hoop 113 is in the contact with lengthways main steel bar 111
Point all welding, during welding, there is not allowed that overlap and burn.
(2) assembling of template
The making of template should use high-quality steel form, and the template per root canal pile only one saves, and must not be assembled into two-section, template
It is composed of two panels semicircle punching block, inner wall smooth impulse- free robustness (assembling flow path of template is as illustrated shown in book attached drawing 7)；
During model sheetinstallat, it should be noted that check thickness of protection tier cushion block, look at either with or without between reinforcing bar and template away from
From the error range for being unsatisfactory for protective layer thickness, thickness of protection tier tolerance is ± 3mm；Two panels half module seam Ying Mi
Envelope, must not spillage.
(3) roller suspension process
Before roller suspension process, stiffener cage is answered to fix and is checked, feeding answers slow and continuous, the roll-forming in feeding；
Quiet roller molding need to be carried out after roll-in, quiet roller molding time should answer slow machine halt after 5 minutes or so, quiet roller, shut down
When, pipe die should be kept not shaken on roll shaft.
(4) health of pile pile
In order to improve the intensity of permeable concrete pipe piles as possible, maintenance method uses steam curing, in 60 DEG C of ± 10 DEG C of items
Health can demould after 9 hours under part.
In concrete tubular pile prefabrication process, it should produce the big agent on crack resistance of concrete pressure that size is 200 × 200 × 200mm
Test specimen is spent, test specimen should be molded when making by the way of press static；Concrete sample after molding is placed on standard and supports
Health 28 days, detects its intensity in raw room.
3rd, high-strength water-permeable fibre pipe rubble core stake Soft Ground principle and structure
There are two high-strength water-permeable fiber concrete pipe rubble core stake Soft Ground principles, and first is consolidated using draining
The principle of knot, using the pile body squeezed into soil to the extruding of weak soil and the compaction of follow-up roadbed filling load, by weak soil
In water pile pile inner cavity is entered by permeable tube wall, pile pile inner cavity is equipped with rubble and is inserted with soft seepy blind pipe, and rubble occupies
The big quantity space of tube core after water is full of the rubble gap of pile pile inner cavity, i.e., overflows nozzle by Permeable blind pipe and rubble,
It is discharged to other than roadbed by blotter；
Second is bearing and the principle of friction pile, and it is stronger that the stake bottom of the permeable fiber pile pile of high intensity is driven into bearing capacity
Soil layer, the effect that soil matrix bearing capacity is strengthened is played by pile top supporting force, meanwhile, pass through rubbing for pile pile outer wall and the soil body
Wiping acts on, and also plays the effect for promoting bearing capacity.
High-strength water-permeable fibre pipe rubble core stake Soft Ground belongs to complex ground treatment form, structure composition master
Have：
3.1 high-strength water-permeable fiber concrete pile piles
The soil body can be had a crowd in-out effects by squeezing into concrete tubular pile in soft thickness soil matrix, after the Roadbed Soil of top, native pressure
There are crowd in-out effects to soft soil foundation, so as to which the water in weak soil be made to pass through the deep pile pile inner cavity of the permeable feature of pile pile in itself, this
When, pile pile plays the role of permeable and collects water.
In addition, there are frictional force between pile pile outer wall and the soil body, therefore, pile pile also acts the effect of friction pile.
High-strength water-permeable fiber concrete pile pile pile top is driven into supporting course, and it is compound that pile pile can be used as supporting pile to be promoted again
The bearing capacity of ground.
3.2 soft seepy blind pipe
Soft seepy blind pipe 30 is inserted into pile pile inner cavity, the water of pile pile inner cavity can be made to be easier discharge upwards.
Rubble in 3.3 pipes
In pile pile lumen loading rubble 20, pile pile inner cavity major part space can be occupied, pile pile memory water number amount is made to subtract significantly
It is few, it is more efficient to discharging consolidation.
3.4 pervious concrete pile covers
The effect of pervious concrete pile cover 40 is to expand pile pile and the contact area of subgrade soils thereon, increases its carrying
Power.
3.5 blotter
Original ground (Soft Soil Layer) and Roadbed Soil is isolated, the water by pile pile and Water penetrative flexible pipe discharge is made successfully to be discharged to road
Except base range.
3.6 steel mould grid
The effect of steel modeling grid 60 is fixed rubble 20, the horizontal sliding for preventing rubble 20 excessive, meanwhile, make entirely to manage
Stake process face forms one, becomes composite foundation (its concrete structure is as shown in Figure of description 2).
4th, the construction of high-strength water-permeable fibre pipe rubble core stake (its operational procedure is as shown in Figure of description 8)
There are many pile pile pile sinking process, mainly has in the method that the country of China uses：Hammering method, static pressure method, lash method,
Water jetting, prebored hole method and middle pick method etc., and it is with the most use with static pressure method.Violent, noise is shaken when driving piles due to diesel hammer
Greatly, to adapt to urban district construction needs, China various regions developed the static pile press pressure pile for prestressed pipe of large-tonnage in recent years
Technique, static pile press can be divided into roof pressing type and hugging pressure type again, and hugging pressure type is that the clamping plate of a machine clamps pile body, by holding plate
Frictional force be more than soil-entering resistance principle work, static pile press maximum pile driving pressure, can be by diameter up to 5000-6000kN
500th, 600 pile for prestressed pipe is pressed onto the supporting course of design requirement, so as to push application and the hair of pile for prestressed pipe significantly
Exhibition.
4.1 selection processing section (by taking normal Li highway as an example)
Often Li highway is the important component of southern Jiangsu province freeway net, completely totally 38.3 kilometers, along the line
Soft soil foundation enriches, and weak soil thickness is deeper, and for maximum up to 33m, Soft Ground mode is cement mixing pile.High-strength water-permeable
Concrete tubular pile is applied handles section (pile No. K26+500-K26+920) in former cement mixing pile, and the section is intrinsic
Cement mixing pile is all changed to high-strength water-permeable fiber concrete pipe rubble core stake, and processing section amounts to 420 meters, soft soil roadbed place
It is 35 meters to manage width, which is 7.4m, and the piling prepressing phase is 180 days, high-strength water-permeable fiber concrete
Pipe rubble core stake spacing is 3.5 meters, and length design is 28m-30m (actual plane arrangement such as Fig. 1 and Fig. 2).
The construction of 4.2 high-strength water-permeable fiber concrete rubble core stakes
The construction process of high-strength water-permeable fiber concrete pipe rubble core stake (as shown in Figure of description 8)
(1) processing section leveling
Before pipe pile static-pressure, boundary first is drawn to the process range for handling section, then carries out clear list processing, processing
Depth the removings such as surface fertile soil, table soil, turf to be advisable, and form two-way horizontal slope, complete by gradient 1%-2%, clear table
Afterwards, the 6-8 tons of light-duty road rollers in surface are compacted 2-3 times, movement and the construction of pile pile is installed in order to tube press machine.
(2) preparation
Due to the slenderness ratio of pile pile is big, from great, excessive dynamic load easily produces pile pile in lifting, transportational process
Raw rupture, correct lifting method are that two-point method or both ends hook and hang method, and drink spike and put down gently in hoisting process, forbid towing, keep away
Exempt to generate larger dynamic load；In transportational process, it should which strapped, layering stacks and the arrangement that misplaces, no more than 5 layers；In work
When ground scene is stacked, it is necessary to solid smooth place or chock be selected to support, heap height is no more than 5 layers.
Construction lofting uses method of polar coordinates, the coordinate per root canal pile is calculated before setting-out, with disappearing after making stake position with total powerstation
Lime makes the circular mark of stake position, and center location is marked with small timber, and pays attention to protecting mark, construction lofting stake position
Deviation is not more than 3cm.
(3) Static pressure pile driver is in place and leveling
Static pressure pile driver use YZY120 types, pile press machine total weight be 120T, rated power 22KW, specified pile driving pressure
1200KN, piling speed 1.0-3.0m, a piling stroke is 150cm；
Coarse balance should be carried out after pile press machine is in place.The first segment stake for installing pile top is lifted by crane, stake is promoted to clip pile
At device, and to feed in stake to pile chuck, when stake being slowly reduced to pile top away from ground 30-50cm, pile chuck rises to stake top, and
Stake is stepped up, a vertical centering is then made by mobile or adjustment stake machine.
(4) pressing pile construction and connector
After pile top is inserted into stake position, start pile press machine, piling, and ensured at any time with theodolite observation pile body inclining situation
The each of first segment stake is no more than 0.5% to perpendicularity deviation, and the verticality of follow-up stake is no more than 1%, and piling speed should be controlled strictly
System, general control is in 1-2m/min；
When first segment stake top is away from ground 50cm or so, lifting the second section stake is connect after alignment using the method for welding
Stake, the pile crown of the front lower section stake of pile extension add positioning plate, then hang upper section stake on lower section pile end plate, will by positioning plate
Upper and lower staking is straight, and dislocation deviation should not exceed 2mm；Upper and lower stake all pads firm welding if any gap with wedge-shaped iron plate；Weldering
Welding should be layered when connecing, in first symmetrical 6 points of the spot welding of groove surrounding, welds and is symmetrically carried out by two welders；The welding number of plies must not be lacked
In 2 layers；
Dynamic chek compression distance is answered during piling, when reaching design stake bottom elevation, stops piling.If at this point, pile crown
It should be amputated higher than design altitude, it is ± 5mm to amputate the height of pile top deviation after pile crown.
(5) it inserts soft seepy blind pipe, fill rubble
After piling, stake top is cut off according to designed elevation, soft seepy blind pipe is inserted into stake in-core, it is soft after insertion
The Bottom Altitude of Permeable blind pipe is higher 40cm than stake bottom elevation, and soft seepy blind pipe is maintained at pile pile lumen centers line position as possible.
Then rubble is poured into, rubble is continuous grading rubble or simple grain grade rubble, and the intensity index of rubble is without strict demand, but to it
Clay content, dust content, clod content should be controlled strictly, and range estimation rubble should be clean, and no clod and dust detect clay content
＜ 3%.
(6) pervious concrete pile cover is constructed
After piling, stake top absolute altitude is less than leveling absolute altitude 20cm, in stake top according to pile cover size excavation, trimming pile
Cap clay model places reinforced mesh after-pouring pervious concrete；The strength grade of pervious concrete pile cover be C15, pervious concrete
The tolerance of the axis deviation of pile cover, planar dimension, crown elevation etc. is respectively ± 15mm, ± 30mm, ± 20mm.
(7) blotter and the modeling grid construction of double-layer double-direction steel
Before blotter construction, sedimentation plate should be installed according to the requirement of design drawing, sedimentation plate is generally cross-section in roadbed
At the every section 3 in face direction, every 30 meters of sections, the sedimentation pipe settled on plate should in time be lengthened according to the situation of banketing；
Blotter rubble is required totally without clod, clay content or dust content ≯ 3%, steel modeling grid two directions tension
Power standard value N ＞ 80KN/m, elongation percentage ＜ 10%；
First layer rubble is laid with, thickness 20cm is compacted 2 times with the light-duty road rollers of 6-8t, is laid with the two-way plastic-steel lattice of lower floor
Grid；Then, second layer rubble is laid with, thickness 20cm is compacted 2 times with the light-duty road rollers of 6-8t, and it is fine to be laid with the two-way plastic-steel in upper strata
Dimension.
(8) surcharge preloadings are filled and waited to subgrade soils
High-strength water-permeable fiber concrete pile pile Soft Ground principle is based primarily upon the principle of discharging consolidation, therefore will
Ensure treatment effect, the water of weak soil in itself must just effectively excluded, therefore carry out Roadbed Soil after the completion of tube pile construction
When, it should be specifically noted that some 2 points：1. filling speed will control in 30cm/d, to reduce the immediate settlement of soil matrix；2. subgrade soils
And after pre- firming all loads, squeeze time is determined according to settlement observation situation, generally it is no less than half a year, and continuous 3 months
It is considered as subgrade stability when monthly sedimentation is no more than 5mm.
Subgrade soils construction is completed by design requirement, controls compactness.
5th, high-strength water-permeable fibre pipe rubble core stake Soft Ground pattern handling effect
Normal highway K26+500-K26+920 sections of Li soft base uses high-strength water-permeable fibre pipe rubble core stake processing mode,
In order to observe treatment effect, settlement observation has been carried out, and to the K32+ of close ground situation by design drawing requirement to the section
036-K32+353 sections cement mixing pile treatment of soft foundation section compares, as a result such as table 2.
2 two kinds of soft foundation treatment effect comparison sheets of table
It is found by comparing, using soft soil foundation of the present invention, the processing of bearing capacity ratio cement mixing pile improves 13%,
Duration shortens 34%, and total settlement is significantly less than other processing modes after roadbed work, saves cost 11.4%.
In addition, in order to evaluate for the soft thick basement process effect in high-strength water-permeable fiber concrete pipe rubble core stake processing section
Fruit, and single pile bearing capacity experiment, Pile Composite Foundation load carrying capacity test and inter-pile soil settlement observation have been carried out, it is specific detailed
See Figure 11.
The foregoing is a detailed description of the present invention in conjunction with specific embodiments, it is impossible to assert that the present invention is specific
Implementation is only limitted to these explanations.For those skilled in the art to which the present invention belongs, present inventive concept is not being departed from
Under the premise of, several simple deduction or replace can also be made, should all be considered as belonging to the scope of protection of the invention.
Claims (8)
1. the soft thick soil treatment structure of high-strength water-permeable fiber concrete pipe rubble core stake, it is characterised in that：At the soft thick soil matrix
It manages structure and includes high-strength water-permeable fiber concrete pile pile (10), rubble (20), soft seepy blind pipe (30), pervious concrete pile cover
(40), blotter (50) and two-way steel-plastic grid (60), the rubble (20) are filled in high-strength water-permeable fiber concrete pile pile
(10) in, the soft seepy blind pipe (30) is arranged in the high-strength water-permeable fiber concrete pile pile (10), described permeable mixed
Solidifying soil pile cover (40) is arranged on the upper end of the high-strength water-permeable fiber concrete pile pile (10), the pervious concrete pile cover (40)
Top and its blotter (50) is surrounded by, in the middle part of the blotter (50) and upper part is equipped with two-way steel-plastic grid
(60), filling roadbed native (70) and roadbed (80) above top layer's two-way steel-plastic grid (60).
2. the soft thick soil treatment structure of high-strength water-permeable fiber concrete pipe rubble core stake, feature exist according to claim 1
In：The high-strength water-permeable fiber concrete pile pile (10) includes cylindrical shape pile body (11), end plate (12) and pile protection hoop (13) structure
Into the end plate (12) is located at cylindrical shape pile body (11) both ends, and the pile protection hoop (13) is around cylindrical shape pile body (11)
Both ends head is set.
3. the soft thick soil treatment structure of high-strength water-permeable fiber concrete pipe rubble core stake, feature exist according to claim 2
In：The high-strength water-permeable fiber concrete pile pile (10) further includes the reinforcing bar being arranged in the cylindrical shape pile body (11), described
Reinforcing bar include lengthways main steel bar (111), reinforcing rib (112) and tie hoop (113), and the lengthways main steel bar (111) and it is described add
Strengthening tendons (112) are provided in cylindrical shape pile body (11) tube wall, and the lengthways main steel bar (111) vertical welding is fixed on described add
The outside of strengthening tendons (112), the tie hoop (113) are looped around the outside of lengthways main steel bar (111).
4. according to the method for the soft thick soil treatment structure of high-strength water-permeable fiber concrete pipe rubble core stake described in claim 1-3,
It is characterized in that：The method includes：Step (1) high-strength water-permeable fiber concrete mix-design；Step (2) high-strength water-permeable is fine
Dimension concrete tubular pile designs and produces；The construction of step (3) high-strength water-permeable fibre pipe rubble core stake.
5. the method for the soft thick soil treatment structure of high-strength water-permeable fiber concrete pipe rubble core stake according to claim 4,
It is characterized in that：The dispensing of high-strength water-permeable fiber concrete described in step (1) includes water, cement, aggregate, additive and polypropylene
Fiber, the cement use P.O42.5 Portland cements, also added in the cement and account for cement weight 2%-2.5%
Rubber powder, the aggregate uses 10-20mm simple grain grade rubbles, and the volume of the additive is the 3.0%-3.5% of cement weight,
The polypropylene fibre length is 5-10mm.
6. the method for the soft thick soil treatment structure of high-strength water-permeable fiber concrete pipe rubble core stake according to claim 4,
It is characterized in that：High-strength water-permeable fiber concrete pile pile described in step (2) design and produce including：Step (2.1) high-strength water-permeable
The diameter of fiber concrete pile pile and section determine；Step (2.2) high-strength water-permeable fiber concrete pile pile designs and arrangement of reinforcement；Step
(2.3) high-strength water-permeable fiber concrete pile pile overhang roll technological forming.
7. the method for the soft thick soil treatment structure of high-strength water-permeable fiber concrete pipe rubble core stake according to claim 6,
It is characterized in that：Step (2.3) high-strength water-permeable fiber concrete pile pile overhang roll technological forming includes：Step (2.31) framework of steel reinforcement system
Make：The Making of reinforcement cage include skeleton moulding bed prepares, reinforcing rib is installed, the installing and weld of main reinforcement reinforcing bar, tie hoop
Installation and welding and skeleton finished product, when Making of reinforcement cage should control main reinforcement bar spacing, tie hoop spacing and
Point mass is welded, wherein, the spacing tolerance of main ribs reinforcing bar is little no more than 5mm, tie hoop spacing tolerance
It is no more than -100mm with theoretical calculation length variation in 10mm and the single pile pile materials total length of tie hoop；Step (2.32)
The assembling of template：The assembling of the masterplate includes template internal model coating release agent, installation framework of steel reinforcement enters half module, installs protective layer pad
Block, combination two panels half module and cloth lid are placed, wherein the template construct is using high-quality steel form, the template per root canal pile is extremely
More sections, template is composed of two panels semicircle punching block, inner wall smooth impulse- free robustness, during the model sheetinstallat, answers check protection
Layer thickness cushion block ensures that the distance between reinforcing bar and template meet the error range of protective layer thickness, and protective layer thickness allows inclined
Difference is ± 3mm, and two panels semicircle punching block seam should seal, must not spillage；Step (2.33) roller suspension process, in the roller suspension process
Before, stiffener cage, which is fixed, to be checked, feeding is slowly carried out continuously, the roll-forming in feeding, and quiet roller molding is carried out after roll-in,
Quiet roller molding time should answer slow machine halt after 4min, quiet roller, and when shutdown keeps pipe die not shaken on roll shaft；Step
(2.34) health of pile pile：The health of the pile pile uses steam curing, under the conditions of 60 DEG C ± 10 DEG C after health 9 hours
Demoulding.
8. the method for the soft thick soil treatment structure of high-strength water-permeable fiber concrete pipe rubble core stake according to claim 4,
It is characterized in that：The construction of high-strength water-permeable fibre pipe rubble core stake described in step (3) includes：Step (3.1) selection processing section；
The construction of step (3.2) high-strength water-permeable fiber concrete rubble core stake；Wherein, the high-strength water-permeable fibre pipe rubble core stake is applied
Engineering sequence is：Levelling of the land and construction lofting, pipe pile static-pressure construction, pile pile in-core installs soft seepy blind pipe, pile pile in-core fills
Rubble, pile pile block and the construction of pervious concrete pile cover, installation settle plate and sedimentation mark is lengthened in follow-up work, is laid with lower floor
Rubble is laid with the two-way composite plastic steel grating of lower floor, laying upper strata rubble, is laid with the two-way composite plastic steel grating in upper strata, and subgrade soils are successively constructed；Step
Suddenly the construction of (3.2) described high-strength water-permeable fiber concrete rubble core stake includes：Step (3.21) processing section leveling：In pile pile
Before static pressure, boundary first is drawn to the process range for handling section, then carries out clear list processing, the depth of processing is with by surface humic
The removings such as soil, table soil, turf are advisable, and form two-way horizontal slope, gradient 1%-2%, after the completion of clear table, by surface with 6-8 tons
Light-duty road roller is compacted 2-3 times, and movement and the construction of pile pile are installed convenient for tube press machine；Step (3.22) preparation：It is high-strength
Permeable fiber concrete pile pile is hooked using two-point method or both ends and hangs method, and drink spike and put down gently in hoisting process, in transportational process
Should strapped, layering stack and the arrangement that misplaces, no more than 5 layers, when building-site is stacked, the solid smooth place of selection or chock
Bearing, heap height are no more than 5 layers；Step (3.23) Static pressure pile driver is in place and leveling：Static pressure pile driver uses YZY120 types, and pile press machine is total
Weight is 120T, and rated power 22KW, specified pile driving pressure 1200KN, piling speed 1.0-3.4m, one time piling stroke is
150cm；The coarse balance of a fuselage should be carried out after pile press machine is in place, the first segment stake for installing pile top is lifted by crane, stake is promoted
It to pile chuck, and feeds in stake to pile chuck, when stake being slowly reduced to pile top away from ground 30-50cm, pile chuck rises to stake
Top, and pile holder is tight, a vertical centering is then made by mobile or adjustment stake machine；Step (3.24) pressing pile construction and connector：When
After pile top is inserted into stake position, start pile press machine piling, and ensure each of first segment stake with theodolite observation pile body inclining situation at any time
It is no more than 0.5% to perpendicularity deviation, the verticality of follow-up stake is no more than 1%, and piling speed should be strict controlled in 1-2m/min；
When first segment stake top is away from ground 50cm or so, lifting the second section stake uses the method pile extension welded, pile extension is front lower after alignment
The pile crown of stake is saved plus positioning plate, is then hung upper section stake on lower section pile end plate, by positioning plate that upper and lower staking is straight, mistake
Position deviation is not more than 2mm；Upper and lower stake all pads firm welding if any gap with wedge-shaped iron plate；Welding should be layered during welding,
First symmetrical 6 points of the spot welding of groove surrounding, welds and is symmetrically carried out by two welders, the welding number of plies must not be less than 2 layers；It should dynamic during piling
It checks compression distance, when reaching design stake bottom elevation, stops piling；At this point, pile crown should give if above design altitude
Amputation, it is ± 5mm to amputate the height of pile top deviation after pile crown；Step (3.25) fills rubble：After piling, according to designed elevation
Stake top is cut off, then pours into rubble to stake in-core, rubble is continuous grading rubble or simple grain grade rubble, rubble clay content ＜ 3%；
Step (3.26) pervious concrete pile cover is constructed：After piling, stake top absolute altitude is completed less than leveling absolute altitude 20cm, pile foundation construction
Afterwards, it is excavated according to pile cover size in stake top, rebuild into pile cover clay model, place reinforced mesh after-pouring pervious concrete, it is permeable mixed
The strength grade of solidifying soil pile cover is C15, and the permission of the axis deviation of pervious concrete pile cover, planar dimension, crown elevation etc. is inclined
Difference is respectively ± 15mm, ± 30mm, ± 20mm；Step (3.27) blotter and the modeling grid construction of double-layer double-direction steel：In rubble
Before cushion construction, sedimentation plate should be installed according to the requirement of design drawing, sedimentation plate is generally in subgrade cross section direction per section 3
Place, every 30 meters of sections, the sedimentation pipe settled on plate should in time be lengthened according to the situation of banketing；Blotter rubble requires dry
Only without clod, clay content or dust content ≯ 3%, steel modeling grid two directions tension power standard value N ＞ 80KN/m, elongation percentage ＜
10%；Upper strata rubble is laid with, thickness 20cm is compacted 2 times with the light-duty road rollers of 6-8t, is laid with the two-way composite plastic steel grating of lower floor, then,
Rubble, thickness 20cm are compacted 2 times with the light-duty road rollers of 6-8t, are laid with the two-way plastic-steel fabric in upper strata layer by layer in laying；Step
(3.28) surcharge preloadings are constructed and waited to subgrade soils：When carrying out Roadbed Soil after the completion of tube pile construction, filling speed will control
30cm/d, to reduce the immediate settlement of soil matrix；After subgrade soils and pre- firming all load, determined according to settlement observation situation pre-
It presses the time, generally no less than half a year, and continuous 3 months monthly settle are considered as subgrade stability when being not more than 5mm.
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| CN114990955A (en) * | 2022-05-31 | 2022-09-02 | 广东平润建设工程有限公司 | Municipal road structure in urban soft soil foundation zone and construction method thereof |
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| CN113860805A (en) * | 2021-10-11 | 2021-12-31 | 柳州北皓建材有限公司 | Green pervious concrete and preparation method thereof |
| CN114990955A (en) * | 2022-05-31 | 2022-09-02 | 广东平润建设工程有限公司 | Municipal road structure in urban soft soil foundation zone and construction method thereof |
| CN118110154A (en) * | 2024-04-29 | 2024-05-31 | 湖北省电力规划设计研究院有限公司 | Multiple solid waste synergistic reinforcing soft foundation structure, mold and preparation method |
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