CN109469052A - A kind of miscellaneous fill and muddy terrain pile base construction method - Google Patents
A kind of miscellaneous fill and muddy terrain pile base construction method Download PDFInfo
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- CN109469052A CN109469052A CN201811070081.7A CN201811070081A CN109469052A CN 109469052 A CN109469052 A CN 109469052A CN 201811070081 A CN201811070081 A CN 201811070081A CN 109469052 A CN109469052 A CN 109469052A
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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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
-
- 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
-
- 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
- E02D15/06—Placing concrete under water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/665—Mould-pipes or other moulds for making piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention proposes a kind of miscellaneous fill and muddy terrain pile base construction methods, it is related to piling Technology field, it solves during being commonly in shallow sea muddy terrain and miscellaneous earthen backfill place progress pile foundation construction, drilling is easy to collapse, the problem of leading to useless hole or useless stake, its key points of the technical solution are that, including preparation of construction, stake position setting-out, the production of casing and embedded, configure mud, drilling construction, pore-forming inspection, borehole cleaning, fabrication of reinforcing cage and installation, conduit installation, secondary pile hole cleaning, pouring underwater concrete and Lumen catheter and steel pile casting, suitable for miscellaneous fill and the pile foundation construction of muddy terrain, reaching ensures pile foundation construction quality, improve the purpose of construction efficiency.
Description
Technical field
The present invention relates to piling Technology field, in particular to a kind of miscellaneous fill and muddy terrain pile base construction method.
Background technique
When shallow sea muddy terrain and miscellaneous earthen backfill place carry out pile foundation construction, since the soil is porous, drilling machine is being driven piles
After point one-shot pore-forming extracts tup, mud can be gathered around rapidly in manhole, and collapse hole is caused.Tup can even be buried, be difficult to rush
Hit pore-forming.Even if impact holing, collapse hole is also easily caused when secondary pile hole cleaning after steel reinforcement cage is installed, steel reinforcement cage can be buried, be caused
Useless hole or useless stake, consequence is very serious, intrinsic to be modified.
Summary of the invention
The object of the present invention is to provide a kind of miscellaneous fill and muddy terrain pile base construction methods, can be in shallow sea muddy terrain
Or the Soft Clays region such as miscellaneous earthen backfill place carries out pile foundation construction, it is ensured that pile foundation construction quality, the high advantage of construction efficiency.
Above-mentioned technical purpose of the invention has the technical scheme that a kind of miscellaneous
It bankets and muddy terrain pile base construction method, comprising the following steps:
P1: preparation of construction: before pile foundation construction, place geological condition is verified, it is miscellaneous to remove place
Object replaces the weak soil of upper layer 0.6-1.0m depth, mixes 15% lime and turns on the spot, backfills after uniform mix, use excavator
Or road roller leveling compacting, sprinkling maintenance 7 days, roadbed paving plate formed the builder's road passed in and out for drilling machine and Construction traffic, cloth
Set drilling place；
P2: the setting-out of stake position: stake position is released according to design drawing total station or theodolite are upper on construction ground, on stake position periphery
Embedded cross fender pile；
P3: the production of casing and embedded: by thickness between 11-13mm, length is being greater than 5.0m and is being more than silt depth steel
Board ends weld to form a round casing, with rotation drilling bucket by hole location in shield-tube embedment depth bounds miscellaneous fill or mud dig
It removes, recycles rotary drilling rig to lift casing in place, squeeze into casing in hole followed by the vibration hammer of same diameter, form shield
Wall, casing top are higher by construction ground 50cm or more, are filled up, tamped with clay on the outside of casing, prevent the surface water along on the outside of casing
Wall penetrates into drilling；
P4: slurrying: selecting the high plastic clay 20% more containing sodium ion, adds 10% bentonite with cellulose, 0.5%
~0.65% industrial sodium hydroxide, 0.003% acrylamide (PHP), remaining group are divided into water, configure mud；And by mud
Indices are controlled in density 1.20-1.35 g/cm3,18~22s of viscosity, sand factor≤6%, pH value 8-10；Wherein, enter
The indices of mud are controlled in 1.30~1.35g/cm3 of density, 20~22s of viscosity after mud；The mud index control of borehole cleaning
System exists: 1.20~1.25g/cm3 of density, 18~20s of viscosity；
P5: drilling construction: checking every preparation before drilling, loosely easily collapses since miscellaneous fill or muddy terrain belong to
Stratum selects rotary drilling rig to carry out pile foundation construction, measures casing absolute altitude before drilling, and calculates practical hole depth, uses in drilling process
Static mud protecting wall, drill bit gently presses slow-motion when aperture is constructed, and drill speed is not more than 10 revs/min, fully enters hole in drilling rod
Gradually accelerate normal drilling after mouthful, when drill bit creeps into mud, the revolving speed and drilling rate, increase for reducing drill bit pour into mud
Specific gravity and viscosity increase cleaning bottom of hole number when drilling, and bore operation, which is put into several classes, to be carried out continuously, and the moment pays attention to formation variation, fish out in time
It samples slag to save, and checks geological condition, fill in drilling construction record；
P6: pore-forming inspection: when drilling depth reaches design requirement, checking hole location, aperture, hole depth and gradient etc.,
Drilled-hole inspecting is carried out using cage inspection hole device；
P7: mud balance borehole cleaning: is pressed between 1.20~1.25g/cm3,18~20s of viscosity to bottom hole with middling speed by drilling rod
Mud, replace the mud in hole more than suspension boring mud, the mud index after borehole cleaning is tested by field test personnel, it is ensured that row hole in
Mud hand out touches no 2-3mm particle, mud balance no more than 1.1 g/cm3, sand factor less than 2%, viscosity 17-20S, friction
Stake holes bottom sediment thickness is not more than 20cm, and stanchion bottom hole sediment thickness is not more than 5cm；
P8: fabrication of reinforcing cage and installation: pile foundation steel bar cage is concentrated in reinforcing bar factory and is made, and steel reinforcement cage is equal along pile body surrounding every 2m
Four chucking lug muscle of even arrangement are protruded into the pile crown reinforcing bar of cushion cap part and are packed using pearl cotton casing, in order to the later period into
Row pile crown is cut, and steel reinforcement cage is transported to scene storage after processing is completed, uses bracket support pad below, is covered above with colour bar cloth, reinforcing bar
Cage installation uses truck crane, lifts by crane steel reinforcement cage by shoulder pole girder, and transfer section by section, position admittedly in aperture after the completion of lower section
It is fixed, it avoids that floating cage phenomenon occurs during concrete perfusion, it is ensured that steel reinforcement cage is overlapped with hole location center, hangs muscle length is accurate,
The connection of sound detecting pipe is connected using threaded sleeve, carries out water filling inspection to every sound detecting pipe, and each 1m up and down at jointing
Sound detecting pipe and steel reinforcement cage are carried out binding and fixing with iron wire by place, and centre is finely fixed with positioning ring with steel reinforcement cage, it is ensured that sound detecting pipe
It installs straight, secured；
P9: conduit installation: using inner wall smooth, smoother, internal diameter is consistent, interface is tight, the conduit of diameter 30cm, using preceding to leading
Pipe carries out examination spelling and pressure testing test, and conduit assembles posterior axis deviation between 0.5% to the 10% of drilling depth, and pressure testing power is bottom hole
1.5 times of hydrostatic pressure when conduit lifts entrance, rubber ring or Rubber washer are placed straight, tight, it is ensured that good seal；
P10: secondary pile hole cleaning: checking again for sediment thickness before pouring underwater concrete, is greater than when checking friction pile sediment thickness
When 20cm or stanchion sediment thickness are greater than 2cm, carry out secondary pile hole cleaning using conduit, test the specific gravity of mud after borehole cleaning, sand factor,
Viscosity is poured underwater concrete after borehole cleaning is qualified immediately；
P11: pouring underwater concrete: pile foundation concrete all uses concrete mixing station centralized mixing, and concrete tank car is transported to existing
, scene is tested to be poured into the slump of pile foundation concrete, divergence, gassiness figureofmerit, and test result, which meets, to be set
After meter requires, between conduit upper port installation funnel, hopper capacity 1.8-2.2t, guarantee impact energy when concrete falls
Amount, mud can be discharged from concrete；
P12: after underwater gliders, remaining conduit and steel shield Lumen catheter and steel pile casting: are extracted at a slow speed by crane
Cylinder, recycling.
By using above-mentioned technical proposal, before pile foundation construction, replaces upper layer weak soil and mixes 15% lime and turn on the spot,
Backfill, leveling compacting, improve the bearing capacity of upper layer soil property, are convenient for Large Construction vehicles while passing place after uniform mix；Using
Digging machine drilling is rotated, it can be to avoid occurring bit freezing in drilling process and the phenomenon that drill bit is fallen；Carrying out borehole cleaning twice can be effective
Avoiding the problem that borehole cleaning is not thorough causes boring mud excessive and influences bearing capacity of pile foundation；Static mud protecting wall is used in drilling process,
Drill bit gently presses slow-motion when aperture is constructed, and is adjusted at any time according to the ingredient for fishing for sample slag to the revolving speed and rate of penetration of drill bit,
Specific gravity and viscosity that mud off uses mud are adjusted simultaneously, it is possible to prevente effectively from because drilling process hole wall collapses problem, it is ensured that
Pile foundation construction quality；Hole location, aperture, hole depth and gradient etc. are checked using cage inspection hole device, it is possible to prevente effectively from
The problem of hole scattering, it is ensured that hole quality；It is provided with mud circulating system, the slurry coat method in boring procedure can be followed
Ring utilizes, saving of work and time, can effectively save material cost, reduces pollution of the mud to construction site；It makes rational planning for construction site
And construction procedure, entire work progress orderly carry out, and improve pile foundation construction efficiency.
The further setting of the present invention, in step P1, rolled between the builder's road and construction site be trimmed to it is flat
Along slope surface.
By using above-mentioned technical proposal, smooth slope surface smoothly passes in and out construction site convenient for drilling machine and Construction traffic.
The further setting of the present invention, in step P1, arrangement drilling place include on construction ground on clearly advise
Draw mud pit, steel reinforcement cage, conduit, hopper and construction machinery placement position, the mud pit be arranged at builder's road it is big in
To the left, the size of mud pit is 6m × 12m × 2.5m to Cheng Fang, carries out mud pit in time after digging well and goes along with sb. to guard him, mud pit is divided into heavy
Shallow lake pond and pulp storage tank, outflow flows into sedimentation basin through mud ditch with the mud of boring mud from drilling, by sedimentation basin through preliminary sedimentation
Pulp storage tank is flowed into afterwards to suck for slush pump, it is with change-can mixer that mud modulation is uniformly stand-by in mud pit.
By using above-mentioned technical proposal, the clearly planning of mud pit position and steel reinforcement cage, conduit, hopper and construction machinery
Put as required, convenient for the orderly progress of pile foundation construction；The setting of mud pit facilitates mud off in the process directly to casing
Interior extraction mud is also convenient for recycling for borehole cleaning outflow mud, reduces construction cost.
The further setting of the present invention, in step P2, the cross fender pile will be higher by casing top surface and with mortar and mixed
Solidifying soil is fixed on the positioning, in case testing in drilling process to stake position, field technician checks at any time, guarantees shield
Stake must not be displaced.
By using above-mentioned technical proposal, the setting of cross fender pile is convenient for guaranteeing drilling at any time testing to stake position
In the process, cross fender pile mortar and concrete, which are fixed on the positioning, can greatly reduce the displacement that cross fender pile is loosened by soil property
Amount guarantees the stability of stake bit trial result.
The further setting of the present invention, the diameter of the casing are greater than design aperture 20cm-30cm.
By using above-mentioned technical proposal, when the length that the diameter of casing is more than design aperture is less than 20cm, in drill bit
The phenomenon that casing blocks drill bit is easy to appear in impact process；When the length that the diameter of casing is more than design aperture is greater than 30cm
When, the earth volume for excavating shield-tube embedment depth bounds is larger, and construction cost is high, and is difficult to ensure the gradient of drilling.
The further setting of the present invention, the part that the casing is higher by construction ground are equipped with the excessive slurry of the cm of 40 cm × 40
Mouthful, the mud in the casing passes through at the excessive slurry mouth stream, and flows into sedimentation basin by mud ditch.
By using above-mentioned technical proposal, the mud in casing flows into sedimentation basin by overflow slurry mouth, mud ditch, reduces mud
It is excessive everywhere and pollute construction ground, recycling for mud is also facilitated, construction cost is saved.
The further setting of the present invention, in step P4, under normal circumstances, sample slag takes once according to 2m, occurs in geology
When variation, add and take once, when geology and different design conjunction, every 0.3-0.5m is taken once.
By using above-mentioned technical proposal, when using plus by the way of taking a sample slag and increasing sampling frequency, can improve and lead to
The accuracy that sample slag testing result judges geologic structure is crossed, obtains more accurately geological condition information, and turn in time to drill bit
It speed and rotates into rate and is adjusted, guarantee hole quality.
The further setting of the present invention, in step P10, the depth in the lower mouth Transducers Embedded in Concrete of the conduit is not less than
1m, is not more than 3m, and underwater gliders guarantee is carried out continuously.
By using above-mentioned technical proposal, when mouth length of embedment is greater than 3m under conduit, conduit inner concrete and conduit stud
Concrete upper surface height difference in hole is small will lead to that filling concrete is unsmooth and the outer concrete climb of conduit it is excessive be mixed into it is miscellaneous
Matter is more, relatively concentrates；When mouth length of embedment is less than 1m under conduit, during extracting conduit, there are shapes in concreting face
At the danger of the disconnected section of pile body, in addition the outer small compactness that will lead to casting concrete structure of pressure difference is inadequate inside the Pass.
In conclusion the invention has the following advantages:
1, before pile foundation construction, the lime for replacing upper layer weak soil and incorporation 15% turns on the spot,
It backfilled after even mix, flatten compacting, improve the bearing capacity of upper layer soil property, be convenient for Large Construction vehicles while passing place；
It 2, can be to avoid occurring bit freezing in drilling process and the phenomenon that drill bit is fallen using rotation digging machine drilling；
3, borehole cleaning is carried out twice it is possible to prevente effectively from borehole cleaning is not thorough the problem of causing boring mud excessive and influencing bearing capacity of pile foundation；
4, static mud protecting wall is used in drilling process, drill bit gently presses slow-motion when aperture is constructed, according to the ingredient pair for fishing for sample slag
The revolving speed and rate of penetration of drill bit are adjusted at any time, while adjusting specific gravity and viscosity that mud off uses mud, Ke Yiyou
Effect avoids collapsing problem because of drilling process hole wall, it is ensured that pile foundation construction quality；
5, hole location, aperture, hole depth and gradient etc. are checked using cage inspection hole device, it is possible to prevente effectively from hole scattering
Problem, it is ensured that hole quality；
6, it is provided with mud circulating system, the slurry coat method in boring procedure can be recycled, saving of work and time can be effective
Material cost is saved, pollution of the mud to construction site is reduced；
7, it makes rational planning for construction site and construction procedure, entire work progress orderly carries out, and improves pile foundation construction efficiency.
Detailed description of the invention
Fig. 1 is the process flow chart of pile base construction method of the present invention.
Appended drawing reference: P1, preparation of construction；P2, the setting-out of stake position；P3, the production of casing and embedded；P4, slurrying；P5,
Drilling construction；P6, pore-forming inspection；P7, borehole cleaning；8, fabrication of reinforcing cage and installation；P9, conduit installation；；10, secondary pile hole cleaning；11,
Pouring underwater concrete；12, reverse irrigation and steel pile casting are pulled out.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
A kind of miscellaneous fill and muddy terrain pile base construction method, as shown in Figure 1, comprising the following steps:
P1: preparation of construction: before pile foundation construction, place geological condition is verified, it is miscellaneous to remove place
Object replaces the weak soil of upper layer 0.6-1.0m depth, mixes 15% lime and turns on the spot, backfills after uniform mix, use excavator
Or road roller leveling compacting, sprinkling maintenance 7 days, roadbed paving plate formed builder's road, needed between builder's road and construction site
It rolls and is trimmed to smooth slope surface, so that drilling machine and Construction traffic can be passed in and out successfully from builder's road.After the completion of builder's road,
Carry out drilling place arrangement, drilling Ground arrangement include on construction ground on clearly plan mud pit, steel reinforcement cage, conduit, material
The placement position of bucket and construction machinery, mud pit are arranged on the left of the big mileage direction of builder's road, and the size of mud pit is 6m
× 12m × 2.5m carries out mud pit after digging well in time and goes along with sb. to guard him, and mud pit is divided into sedimentation basin and pulp storage tank, and band is flowed out from drilling
There is the mud of boring mud to flow into sedimentation basin through mud ditch, flows into pulp storage tank after preliminary sedimentation by sedimentation basin and sucked for slush pump,
It is with change-can mixer that mud modulation is uniformly stand-by in mud pit.
P2: the setting-out of stake position: stake position is released according to design drawing total station or theodolite are upper on construction ground, in stake position week
Cross fender pile is buried on side, and cross fender pile is higher by casing top surface and carries out reinforcement protection with mortar or concrete, in case drilling process
In test to stake position, field technician checks at any time, guarantee fender pile must not be displaced.
P3: the production of casing and embedded: in 12mm, length 6.0m and being more than that silt depth steel plate both ends are welded by thickness
A round casing is formed, the part that casing is higher by construction ground is equipped with the excessive slurry mouth of the cm of 40 cm × 40, and the diameter of casing is greater than
Designing aperture 24cm(, this numerical value can also be 20cm, 22cm, 26cm, 28cm, 30cm in other embodiments), this diameter
Casing be both less prone to the phenomenon that casing blocks drill bit during drill bit impact, shield-tube embedment depth model can also be reduced to the greatest extent
Interior excavation amount is enclosed, construction cost is lower, and the gradient of drilling is small；Casing is buried using mechanical excavation, first uses rotary drilling
Bucket by hole location in shield-tube embedment depth bounds miscellaneous fill or mud excavate, recycle rotary drilling rig by casing lift in place,
Followed by the vibration hammer of same diameter by casing press-in hole, it is higher by construction ground 50cm at the top of casing, checks the inclination of casing
Spend deviation, it is ensured that in 1% range；Specific gravity is used to carry out retaining wall for the mud of 1.15 g/cm3 between stake holes inner wall and casing,
Mud forms mudcake, closing and stable hole wall in hole wall, prevents hole wall collapse；It filled up with clay on the outside of casing, tamp and prevent ground
Face water penetrates into drilling along casing lateral wall.
P4: slurrying: the selection high plastic clay 20% more containing sodium ion, 10% bentonite with cellulose of addition,
0.5%~0.65% industrial sodium hydroxide, 0.003% acrylamide (PHP), remaining group are divided into water, configure mud；And by mud
The indices of slurry are controlled in density 1.20-1.35 g/cm3,18~22s of viscosity, sand factor≤6%, pH value 8-10；Wherein,
The indices of mud are controlled in 1.30~1.35g/cm3 of density, 20~22s of viscosity after into mud；The mud of borehole cleaning refers to
Mark control exists: 1.20~1.25g/cm3 of density, 18~20s of viscosity；
P5: it drilling construction: needs to report supervising engineer to check after survey crew's repetition measurement stake position is errorless before drilling machine is in place, then right
Every preparation is checked before drilling, the inspection and maintenance including main mechanical, including the inclination of bit diameter, drilling rod
Degree, pedestal and top ensure that steadily the position deviation of bit central and drill center controls within the scope of 2cm；Due to miscellaneous fill
Or muddy terrain belongs to the stratum that loosely easily collapses, and rotary drilling rig is selected to carry out pile foundation construction, measures casing absolute altitude before drilling, and calculates real
Border hole depth uses static mud protecting wall in drilling process, enters the hole common stratum of mud viscosity ratio and want bigger than normal, mud injection length control
System was at 19-28 seconds, and mud is than control in 1.05-1.15 g/cm3, and sand factor is not more than 4%, and colloidity is not less than 95%, and pH value is big
In 8, drill bit gently presses slow-motion when aperture is constructed, and drill speed is not more than 10 revs/min, gradually adds after drilling rod fully enters aperture
Fast normal drilling when drill bit creeps into mud, reduces the revolving speed and drilling rate of drill bit, increases the specific gravity for pouring into mud and glutinous
Degree increases cleaning bottom of hole number when drilling, and bore operation, which is put into several classes, to be carried out continuously, and the moment pays attention to formation variation, fishes for sample slag guarantor in time
It deposits, and checks geological condition, fill in drilling construction record, under normal circumstances, sample slag takes once according to 2m, changes in geology
When, add and take once, when geology and different design conjunction, every 0.3-0.5m is taken once, is improved the accuracy of sample slag testing result, is obtained
It to the revolving speed of drill bit and rotates into rate to more accurate geological condition information, and in time and is adjusted, guarantee hole quality.
P6: pore-forming inspection: when drilling depth reaches design requirement, hole location, aperture, hole depth and gradient are examined
It looks into, drilled-hole inspecting is carried out using cage inspection hole device, inspection hole device is made according to code requirement, and the outer diameter of inspection hole device is 1m, long
Degree is 6m.
P7: borehole cleaning: by drilling rod with middling speed to bottom hole be pressed into mud balance 1.15 g/cm3, sand factor 0.2-0.4% it
Between mud, replace the mud in hole more than suspension boring mud, the mud index after borehole cleaning is tested by field test personnel, it is ensured that in hole
The mud hand of discharge touches no 2-3mm particle, mud balance and, less than 2%, viscosity 17-20S, rubs no more than 1.1 g/cm3, sand factor
It wipes stake holes bottom sediment thickness and is not more than 20cm, stanchion bottom hole sediment thickness is not more than 5cm.
P8: fabrication of reinforcing cage and installation: pile foundation steel bar cage is concentrated in reinforcing bar factory and is made, and steel reinforcement cage is every 2m, along pile body four
It is evenly arranged four chucking lug muscle week, the pile crown reinforcing bar for protruding into cushion cap part is packed using pearl cotton casing, in order to rear
Phase carries out pile crown and cuts, and steel reinforcement cage is transported to scene storage after processing is completed, uses bracket support pad below, is covered above with colour bar cloth,
Steel reinforcement cage installation uses truck crane, lifts by crane steel reinforcement cage by shoulder pole girder, and transfer section by section, is positioned after the completion of lower section in aperture
It is fixed, it avoids that floating cage phenomenon occurs during concrete perfusion, it is ensured that steel reinforcement cage is overlapped with hole location center, hangs muscle length is quasi-
Really, the connection of sound detecting pipe is connected using threaded sleeve, carries out water filling inspection to every sound detecting pipe, and each up and down at jointing
Sound detecting pipe and steel reinforcement cage are subjected to binding and fixing with iron wire at 1m, centre is finely fixed with positioning ring with steel reinforcement cage, it is ensured that sounding
Pipe installation is straight, secured；
P9: conduit installation: using inner wall smooth, smoother, internal diameter is consistent, interface is tight, the conduit of diameter 30cm, using preceding to leading
Pipe carries out examination spelling and pressure testing test, and conduit assembles posterior axis deviation between 0.5% to the 10% of drilling depth, and pressure testing power is bottom hole
1.5 times of hydrostatic pressure (are calculated, pressure testing power is 0.735MPA, is calculated by 60m hole depth, and pressure testing power is by 50m hole depth
0.882MPA is calculated by 70m hole depth, and pressure testing power is 1.029MPA), when conduit lifts entrance, rubber ring or Rubber washer are placed
It is straight, tight, it is ensured that good seal.
P10: secondary pile hole cleaning: checking again for sediment thickness before pouring underwater concrete, when checking friction pile sediment thickness
When being greater than 2cm greater than 20cm or stanchion sediment thickness, secondary pile hole cleaning is carried out using conduit, the specific gravity of mud after borehole cleaning is tested, contains
Sand coarse aggregate ratio, viscosity are poured underwater concrete after borehole cleaning is qualified immediately.
P11: pouring underwater concrete: pile foundation concrete all uses concrete mixing station centralized mixing, and concrete tank car transports
To scene, scene is tested to be poured into the slump of pile foundation concrete, divergence, gassiness figureofmerit, and is made according to the rules
Make standard curing member, every pile must not be less than 2 groups of test specimens, after test result meets design requirement, install and leak in conduit upper port
It struggles against, between hopper capacity 1.8-2.2t, guarantees impact energy when concrete falls, mud can be discharged from concrete.It leads
It manages depth in lower mouth Transducers Embedded in Concrete and is not less than 1m, be not more than 3m, when mouth length of embedment is greater than 3m under conduit, coagulation in conduit
Soil and the concrete upper surface height difference in the outer stake holes of conduit is small will lead to that filling concrete is unsmooth and the outer concrete of conduit on lift
From it is excessive be mixed into impurity it is more, relatively concentrate；When mouth length of embedment is less than 1m under conduit, during extracting conduit, coagulation
Soil pours face and there is the danger for forming the disconnected section of pile body, in addition the outer small compactness that will lead to casting concrete structure of pressure difference inside the Pass
Not enough.Underwater gliders guarantee is carried out continuously, and conduit controls the water between 2-6m in buried depth in concrete in filling process
Lower concrete pours top surface by design of pile top elevation 1m control is higher by, to guarantee the quality of stake top concrete.
P12: Lumen catheter and steel pile casting: after underwater gliders, extracted at a slow speed by crane remaining conduit and
Steel pile casting, recycling.
In conclusion the lime for replacing upper layer weak soil and incorporation 15% turns on the spot before pile foundation construction, returned after uniform mix
It fills out, flatten compacting, improve the bearing capacity of upper layer soil property, be convenient for Large Construction vehicles while passing place；It is drilled using rotation digging machine,
It can be to avoid occurring bit freezing in drilling process and the phenomenon that drill bit is fallen；Borehole cleaning is carried out twice it is possible to prevente effectively from borehole cleaning is not thorough
The problem of causing boring mud excessive and influencing bearing capacity of pile foundation；Static mud protecting wall, drill bit when aperture is constructed are used in drilling process
Light pressure slow-motion, is adjusted the revolving speed and rate of penetration of drill bit according to the ingredient for fishing for sample slag at any time, while adjusting mud shield
Wall uses the specific gravity and viscosity of mud, it is possible to prevente effectively from because drilling process hole wall collapses problem, it is ensured that pile foundation construction quality；
Hole location, aperture, hole depth and gradient etc. are checked using cage inspection hole device, it is possible to prevente effectively from the problem of hole scattering,
Ensure hole quality；It is provided with mud circulating system, the slurry coat method in boring procedure can be recycled, saving of labor saves
When, material cost can be effectively saved, pollution of the mud to construction site is reduced；It makes rational planning for construction site and construction procedure, it is whole
A work progress orderly carries out, and improves pile foundation construction efficiency.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (8)
1. a kind of miscellaneous fill and muddy terrain pile base construction method, which is characterized in that including following
Step:
P1: preparation of construction: before pile foundation construction, place geological condition is verified, it is miscellaneous to remove place
Object replaces the weak soil of upper layer 0.6-1.0m depth, mixes 15% lime and turns on the spot, backfills after uniform mix, use excavator
Or road roller leveling compacting, sprinkling maintenance 7 days, roadbed paving plate formed the builder's road passed in and out for drilling machine and Construction traffic, cloth
Set drilling place；
P2: the setting-out of stake position: stake position is released according to design drawing total station or theodolite are upper on construction ground, on stake position periphery
Embedded cross fender pile；
P3: the production of casing and embedded: by thickness between 11-13mm, length is being greater than 5.0m and is being more than silt depth steel
Board ends weld to form a round casing, with rotation drilling bucket by hole location in shield-tube embedment depth bounds miscellaneous fill or mud dig
It removes, recycles rotary drilling rig to lift casing in place, squeeze into casing in hole followed by the vibration hammer of same diameter, form shield
Wall, casing top are higher by construction ground 50cm or more, are filled up, tamped with clay on the outside of casing, prevent the surface water along on the outside of casing
Wall penetrates into drilling；
P4: slurrying: selecting the high plastic clay 20% more containing sodium ion, adds 10% bentonite with cellulose, 0.5%
~0.65% industrial sodium hydroxide, 0.003% acrylamide (PHP), remaining group are divided into water, configure mud；And by mud
Indices are controlled in density 1.20-1.35 g/cm3,18~22s of viscosity, sand factor≤6%, pH value 8-10；Wherein, enter
The indices of mud are controlled in 1.30~1.35g/cm3 of density, 20~22s of viscosity after mud；The mud index control of borehole cleaning
System exists: 1.20~1.25g/cm3 of density, 18~20s of viscosity；
P5: drilling construction: checking every preparation before drilling, loosely easily collapses since miscellaneous fill or muddy terrain belong to
Stratum selects rotary drilling rig to carry out pile foundation construction, measures casing absolute altitude before drilling, and calculates practical hole depth, uses in drilling process
Static mud protecting wall, drill bit gently presses slow-motion when aperture is constructed, and drill speed is not more than 10 revs/min, fully enters hole in drilling rod
Gradually accelerate normal drilling after mouthful, when drill bit creeps into mud, the revolving speed and drilling rate, increase for reducing drill bit pour into mud
Specific gravity and viscosity increase cleaning bottom of hole number when drilling, and bore operation, which is put into several classes, to be carried out continuously, and the moment pays attention to formation variation, fish out in time
It samples slag to save, and checks geological condition, fill in drilling construction record；
P6: pore-forming inspection: when drilling depth reaches design requirement, checking hole location, aperture, hole depth and gradient etc.,
Drilled-hole inspecting is carried out using cage inspection hole device；
P7: mud balance borehole cleaning: is pressed between 1.20~1.25g/cm3,18~20s of viscosity to bottom hole with middling speed by drilling rod
Mud, replace the mud in hole more than suspension boring mud, the mud index after borehole cleaning is tested by field test personnel, it is ensured that row hole in
Mud hand out touches no 2-3mm particle, mud balance no more than 1.1 g/cm3, sand factor less than 2%, viscosity 17-20S, friction
Stake holes bottom sediment thickness is not more than 20cm, and stanchion bottom hole sediment thickness is not more than 5cm；
P8: fabrication of reinforcing cage and installation: pile foundation steel bar cage is concentrated in reinforcing bar factory and is made, and steel reinforcement cage is equal along pile body surrounding every 2m
Four chucking lug muscle of even arrangement are protruded into the pile crown reinforcing bar of cushion cap part and are packed using pearl cotton casing, in order to the later period into
Row pile crown is cut, and steel reinforcement cage is transported to scene storage after processing is completed, uses bracket support pad below, is covered above with colour bar cloth, reinforcing bar
Cage installation uses truck crane, lifts by crane steel reinforcement cage by shoulder pole girder, and transfer section by section, position admittedly in aperture after the completion of lower section
It is fixed, it avoids that floating cage phenomenon occurs during concrete perfusion, it is ensured that steel reinforcement cage is overlapped with hole location center, hangs muscle length is accurate,
The connection of sound detecting pipe is connected using threaded sleeve, carries out water filling inspection to every sound detecting pipe, and each 1m up and down at jointing
Sound detecting pipe and steel reinforcement cage are carried out binding and fixing with iron wire by place, and centre is finely fixed with positioning ring with steel reinforcement cage, it is ensured that sound detecting pipe
It installs straight, secured；
P9: conduit installation: using inner wall smooth, smoother, internal diameter is consistent, interface is tight, the conduit of diameter 30cm, using preceding to leading
Pipe carries out examination spelling and pressure testing test, and conduit assembles posterior axis deviation between 0.5% to the 10% of drilling depth, and pressure testing power is bottom hole
1.5 times of hydrostatic pressure when conduit lifts entrance, rubber ring or Rubber washer are placed straight, tight, it is ensured that good seal；
P10: secondary pile hole cleaning: checking again for sediment thickness before pouring underwater concrete, is greater than when checking friction pile sediment thickness
When 20cm or stanchion sediment thickness are greater than 2cm, carry out secondary pile hole cleaning using conduit, test the specific gravity of mud after borehole cleaning, sand factor,
Viscosity is poured underwater concrete after borehole cleaning is qualified immediately；
P11: pouring underwater concrete: pile foundation concrete all uses concrete mixing station centralized mixing, and concrete tank car is transported to existing
, scene is tested to be poured into the slump of pile foundation concrete, divergence, gassiness figureofmerit, and test result, which meets, to be set
After meter requires, between conduit upper port installation funnel, hopper capacity 1.8-2.2t, guarantee impact energy when concrete falls
Amount, mud can be discharged from concrete；
P12: after underwater gliders, remaining conduit and steel shield Lumen catheter and steel pile casting: are extracted at a slow speed by crane
Cylinder, recycling.
2. a kind of miscellaneous fill according to claim 1 and muddy terrain pile base construction method, which is characterized in that in step P1
In, it is rolled between the builder's road and construction site and is trimmed to smooth slope surface.
3. a kind of miscellaneous fill according to claim 1 and muddy terrain pile base construction method, which is characterized in that in step P1
In, arrangement drilling place include on construction ground on clearly plan mud pit, steel reinforcement cage, conduit, hopper and construction machinery
Placement position, the mud pit is arranged on the left of the big mileage direction of builder's road, the size of mud pit be 6m × 12m ×
2.5m carries out mud pit after digging well in time and goes along with sb. to guard him, and mud pit is divided into sedimentation basin and pulp storage tank, and outflow is with boring mud from drilling
Mud flows into sedimentation basin through mud ditch, flows into pulp storage tank after preliminary sedimentation by sedimentation basin and sucks for slush pump, in mud pit
It is with change-can mixer that mud modulation is uniformly stand-by.
4. a kind of miscellaneous fill according to claim 1 and muddy terrain pile base construction method, which is characterized in that in step P2
In, the cross fender pile will be higher by casing top surface and is fixed on the positioning with mortar and concrete, in case to stake in drilling process
Position is tested, and field technician checks at any time, guarantees that fender pile must not be displaced.
5. a kind of miscellaneous fill according to claim 1 and muddy terrain pile base construction method, which is characterized in that the casing
Diameter be greater than design aperture 20cm-30cm.
6. a kind of miscellaneous fill according to claim 1 and muddy terrain pile base construction method, which is characterized in that the casing
The part for being higher by construction ground is equipped with the excessive slurry mouth of the cm of 40 cm × 40, and the mud in the casing passes through the excessive slurry mouth stream
Place, and sedimentation basin is flowed by mud ditch.
7. a kind of miscellaneous fill according to claim 1 and muddy terrain pile base construction method, which is characterized in that in step P4
In, under normal circumstances, sample slag takes once according to 2m, when geology changes, adds and takes once, when geology and different design are closed
When, every 0.3-0.5m takes once.
8. a kind of miscellaneous fill according to claim 1 and muddy terrain pile base construction method, which is characterized in that in step
In P10, the depth in the lower mouth Transducers Embedded in Concrete of the conduit is not less than 1m, is not more than 3m, and underwater gliders guarantee to connect
It is continuous to carry out.
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| CN110080785A (en) * | 2019-05-16 | 2019-08-02 | 中铁隧道局集团有限公司 | Compound stratum super-large-diameter shield normal pressure warehouse entry reinforced construction method near water |
| CN110331736A (en) * | 2019-07-24 | 2019-10-15 | 中铁四局集团有限公司 | A kind of Slarry cycling apptss and corresponding construction for pile foundation in water construction |
| CN110424381A (en) * | 2019-08-19 | 2019-11-08 | 首钢水城钢铁(集团)赛德建设有限公司 | A kind of process for rotary digging drilling hole stake |
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| CN111119169A (en) * | 2019-12-23 | 2020-05-08 | 诚通凯胜生态建设有限公司 | Construction method of drilled pile |
| CN111206576A (en) * | 2020-01-19 | 2020-05-29 | 重庆渝能建筑安装工程有限公司 | Cast-in-situ bored pile construction process |
| CN111733801A (en) * | 2020-06-28 | 2020-10-02 | 中冶地集团西北岩土工程有限公司 | Construction process of rotary drilling bored concrete pile in soft geology |
| CN111749233A (en) * | 2020-07-20 | 2020-10-09 | 重庆华力建设有限公司 | Extrusion pore-forming process of digging and drilling machine |
| CN112343057A (en) * | 2020-10-16 | 2021-02-09 | 长江三峡集团福建能源投资有限公司 | Construction method for offshore concrete pouring in offshore area |
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| CN113668527A (en) * | 2021-08-04 | 2021-11-19 | 深圳宏业基岩土科技股份有限公司 | Construction method for inserting long steel pile casing under rotary digging pile construction of deep rockfill silt stratum |
| CN113740244A (en) * | 2021-09-22 | 2021-12-03 | 中国水利水电第四工程局有限公司 | Testing method for forming mud skin to prevent seawater ion from corroding bridge pile foundation by utilizing modified marine mud |
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| CN114263156A (en) * | 2021-12-29 | 2022-04-01 | 中铁十二局集团建筑安装工程有限公司 | Construction method of deep-miscellaneous soil filling support pile |
| CN114703831A (en) * | 2022-04-20 | 2022-07-05 | 山西四建集团有限公司 | Construction method of reinforced concrete cast-in-place pile under complex geological condition |
| CN114808957A (en) * | 2022-05-31 | 2022-07-29 | 中国十九冶集团有限公司 | Construction method for forming holes in bridge pile foundation in karst area |
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| CN115787627A (en) * | 2022-12-21 | 2023-03-14 | 浙江广川工程咨询有限公司 | Construction method for manually driving cast-in-place pile |
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| CN110055992A (en) * | 2019-04-23 | 2019-07-26 | 谢定茂 | The construction method of pile foundation |
| CN110080785A (en) * | 2019-05-16 | 2019-08-02 | 中铁隧道局集团有限公司 | Compound stratum super-large-diameter shield normal pressure warehouse entry reinforced construction method near water |
| CN110331736A (en) * | 2019-07-24 | 2019-10-15 | 中铁四局集团有限公司 | A kind of Slarry cycling apptss and corresponding construction for pile foundation in water construction |
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| CN110894722A (en) * | 2019-12-03 | 2020-03-20 | 湖北省路桥集团有限公司 | Construction method of cast-in-situ bored pile |
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| CN111005397A (en) * | 2019-12-25 | 2020-04-14 | 惠州市新业建筑工程有限公司 | Pile foundation construction method |
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| CN111733801A (en) * | 2020-06-28 | 2020-10-02 | 中冶地集团西北岩土工程有限公司 | Construction process of rotary drilling bored concrete pile in soft geology |
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| CN113740244B (en) * | 2021-09-22 | 2023-12-22 | 中国水利水电第四工程局有限公司 | Testing method for sea mud modified sea water ion corrosion barrier bridge pile foundation |
| CN114164823A (en) * | 2021-11-10 | 2022-03-11 | 中交第四航务工程局有限公司 | Pile foundation construction method in high-fill foundation |
| CN114263156A (en) * | 2021-12-29 | 2022-04-01 | 中铁十二局集团建筑安装工程有限公司 | Construction method of deep-miscellaneous soil filling support pile |
| CN114703831A (en) * | 2022-04-20 | 2022-07-05 | 山西四建集团有限公司 | Construction method of reinforced concrete cast-in-place pile under complex geological condition |
| CN114855781A (en) * | 2022-05-18 | 2022-08-05 | 筑邦建设集团股份有限公司 | Construction method of building pile foundation |
| CN114855781B (en) * | 2022-05-18 | 2024-03-22 | 筑邦建设集团股份有限公司 | Construction method of building pile foundation |
| CN114808957A (en) * | 2022-05-31 | 2022-07-29 | 中国十九冶集团有限公司 | Construction method for forming holes in bridge pile foundation in karst area |
| CN115787627A (en) * | 2022-12-21 | 2023-03-14 | 浙江广川工程咨询有限公司 | Construction method for manually driving cast-in-place pile |
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