CN109577319A - A kind of dry type spiral-digging pore bored pile construction method - Google Patents

A kind of dry type spiral-digging pore bored pile construction method Download PDF

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Publication number
CN109577319A
CN109577319A CN201811466933.4A CN201811466933A CN109577319A CN 109577319 A CN109577319 A CN 109577319A CN 201811466933 A CN201811466933 A CN 201811466933A CN 109577319 A CN109577319 A CN 109577319A
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CN
China
Prior art keywords
stake
hole
drilling
construction
pile
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Application number
CN201811466933.4A
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Chinese (zh)
Inventor
赵卫政
宋尔勇
黎业军
黄乃佳
许如安
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JIANGSU XINGSHA CONSTRUCTION ENGINEERING GROUP Co Ltd
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JIANGSU XINGSHA CONSTRUCTION ENGINEERING GROUP Co Ltd
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Priority to CN201811466933.4A priority Critical patent/CN109577319A/en
Publication of CN109577319A publication Critical patent/CN109577319A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/06Foundation trenches ditches or narrow shafts
    • E02D17/08Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00Testing foundations or foundation structures

Abstract

The present invention relates to technical field of building construction, in particular a kind of dry type spiral-digging pore bored pile construction method, include the following steps: that the setting-out of stake position, shield-tube embedment, drilling machine is in place, the placement of borehole wall-protection, first time borehole cleaning, fabrication of reinforcing cage, steel reinforcement cage, checks that conduit, secondary pile hole cleaning, filling concrete, concrete sample make and maintenance and mud emission, the dry type rotary drilling rig drilling construction of invention have many advantages, such as that low noise, low vibration, torque are big, speed of fulfiling hole is fast, recycle without mud;The stratum containing part cobble, rubble crept into is not easy suitable for back fill course, argillic horizon, mud, sandy soils, mud stone, sandstone and short spiral.

Description

A kind of dry type spiral-digging pore bored pile construction method
Technical field
The present invention relates to technical field of building construction, specially a kind of dry type spiral-digging pore bored pile construction method.
Background technique
Dry type rotary drilling rig is as the novel machine in basic engineering machinery, through popularization and application in a few years, at present by It is widely used in the pile foundation engineerings such as highway and railway, bridge, hydraulic engineering, urban architecture engineering.Dry type rotary drilling rig at present Also immature during scraping out hole drilling filling pile construction, inefficient and noise is larger.
Summary of the invention
The purpose of the present invention is to provide a kind of dry type spiral-digging pore bored pile construction methods, to solve above-mentioned background The problem of being proposed in technology.
To achieve the above object, the invention provides the following technical scheme:
A kind of dry type spiral-digging pore bored pile construction method, includes the following steps:
Step 1: the setting-out of stake position:
(1) coordinate points, bench mark and the stake bit plane layout drawing that surveyor provides according to Construction Party carry out axis and stake position Coordinate points mark and are protected in fixed object by major axis mark on surrounding enclosure wall for setting-out;
(2) after surveyor's setting-out, first Project Technical is reported to be responsible for examination;
(3) after Project Technical is responsible for acceptance(check), then the representative of Construction Party building site or management is asked to be checked and accepted;After acceptance(check), warp Both sides responsible person signs approval on stake position setting-out list, and setting-out result is formed information document, can carry out next process Construction;Otherwise, setting-out again;
(4) all piles position hammers into underground 20cm with 12 steel bar end of Φ and marks, and top is coated with red paint, in favor of checking Verification;
(5) stake position setting-out allowable error≤2cm;
(6) bored concrete pile campshed is pacified using the sequence of construction of interval pile, the stake of just completion concreting and adjacent stake pore-forming Full distance, which is no less than 4 times of stake diameter or interval time, should not be less than 36h;
Step 2: shield-tube embedment:
(1) four 16 steel bar ends of Φ are followed closely outside the 0.7m of stake position, its two lines is made to meet at stake position center;
(2) centered on the stake position steel bar end hammered into, the round pool of a 10cm bigger than casing is dug, and bottom will enter undisturbed soil ≥20cm;
(3) when burying casing, tolerance≤20mm of center line and stake position center line, and keep casing vertical;
(4) casing internal diameter is 10cm bigger than stake diameter;
(5) when burying casing, surrounding application clay back-filling in layers compacting, it is ensured that aperture does not collapse, otherwise, casing pine It is dynamic, tilt and lose the effect of cylinder-wall protecting;
(6) after having buried casing, casing absolute altitude suitable for reading is measured one by one, correctly to control stake depth, such as loose fill, casing When easily sinking, casing and drilling machine base are fixed using iron wire;
(7) it after having buried casing, is detected by technical staff, and asks Construction Party or management to check and check and accept;
Step 3: drilling machine is in place:
(1) after drilling machine moves on stake position, by the cross hairs pull-up of stake position surrounding, Rotary table for drilling machine center and stake position centre deviation ≤20mm;
(2) drilling machine bottom pad set sleeper to consolidate it is smooth, to protect drilling machine level firm;
(3) machine squad leader all around corrects drilling machine level with horizontal ruler, and kelly is detected with plummet, squad leader's self-test, matter Inspection person's reinspection, submits a report asking for construction company representative after qualified or management is checked and accepted;After construction company representative or management acceptance(check) and approval of signing It can spud in;
(4) construction of stake position must be spaced away from the stake position of < 3d for pile center or constructed after 24 hours, to prevent perforation accident hair It is raw;
(5) for generated when drilling undergauge, collapse hole the problems such as, using making single waistband three wings prong drill bit by oneself, to avoid Disturbance of the drill bit to hole wall;It is equipped with self-control hole gauge, the variation in pore-forming aperture is monitored in pore forming process, when there is undergauge, collapse hole The problems such as when, the performances such as Ying Tigao drilling slurry viscosity, specific gravity and reduce drilling drilling rate, the construction parameters such as revolving speed, it is ensured that Drilling quality;
Step 4: borehole wall-protection:
(1) it requires hole wall to stablize in drilling, does not collapse;
(2) mud liquid level should keep stable in pore forming process mesoporous;
(3) very soft sill clay drill when be also easy to produce undergauge, collapse hole the problems such as, for this purpose, when drilling in these soil layers Mud balance should be increased to 1.3;
(4) this construction uses original soil pulping, and specific gravity, viscosity are by Quality Inspector's running check, when undesirable, in time It takes measures, cleaning mud pit, sedimentation basin, circulation groove etc., waste pulp are transported outward in time;
(5) if spoiling, hole is serious, and into hole, backfill cohesive soil places redrilling after a period of time;
Step 5: first time borehole cleaning:
(1) bottom hole sediment is required to be completely exhausted out;
(2) drilling tool is above mentioned into 20cm, using the premium mud borehole cleaning of sand factor < 4%, is completely exhausted out bottom hole sediment;
(3) first time borehole cleaning is more than or equal to half an hour;
Step 6: fabrication of reinforcing cage;
Step 7: steel reinforcement cage disposes;
Step 8: checking conduit;
Step 9: secondary pile hole cleaning;
Step 10: filling concrete;
Step 11: concrete sample make and maintenance;
Step 12: mud emission.
As a preference of the present invention, borehole perpendicularity requirement < 1/100H in the step 3, and drill bit uses waist band, Guarantee drill bit direction straight down, add counterweight drilling rod on drill bit top, makes drilling rod center of gravity in bottom in drilling, to ensure vertically Degree.
As a preference of the present invention, the step 3 pile cross-section error requires to be 0≤stake diameter Pian Cha≤+ 30mm, bore Area of bed, not less than design stake diameter, every hole terminates Quality Inspector after mentioning brill and is intended to detection outside diameter, and repair welding at any time ensures that drill bit is straight Diameter uses different rotating speeds for Different Strata, aperture passes through casing bottom using light pressure slow-speed in typical special geology section section Lower 1.0m or so is carried out using normal drilling regulation, and the cohesive soil to bottom containing sand is using the measure for adding counterweight drilling, to improve Rate of penetration accurately measures each pile concrete groundwater increment, fullness coefficient is calculated, to adjust bit diameter.
As a preference of the present invention, also need to guarantee that effective length meets design requirement in the step 3, after the completion of stake holes, It must be checked and accepted through construction company representative or management, accurately measure drilling tool: be the starting point for calculating hole depth at drill bit cone 1/2, and calculate hole The starting point of bottom sediment;It must be measured when every drilling rod decentralization, metering outfit has to pass through verification, after drilling to projected depth, machine Squad leader's self-test after Quality Inspector's reinspection, asks Construction Party, management to site inspection to check and accept, signs and approve after qualified, can whole hole.
As a preference of the present invention, in the step 6 fabrication of reinforcing cage need to meet the requirements meet design drawing and " building Standard for pile foundation ";Kind, model, the specification of steel must be examined, and design requirement is met;All steel have been intended to quality certificate, And retrial is sampled by pertinent regulations;First curved reinforcing bar should be straightened when blanking, strictly accurately controlled down by the size on attached drawing Expect length;Fabrication of reinforcing cage personnel must take appointment with certificate;When steel reinforcement cage is placed, main reinforcement protective layer uses locating piece, in steel reinforcement cage It is evenly distributed with one group of locating piece in main reinforcement around steel reinforcement cage every 3m;The production of steel reinforcement cage merogenesis, aperture welding are integral.
As a preference of the present invention, steel reinforcement cage placement needs to meet in the step 7: steel reinforcement cage enters the perpendicular shape of Kong Shiying State enters hole, and alignment hole location is put down gently slowly;Forbid barbarous operation, plays cage by force;There is commander special messenger during lower cage, be hampered halfway It must not transfer by force, the double-fermented wine feelings that should ascertain the reason processing;When steel reinforcement cage aperture is docked, inconel weld length >=10d, weld seam is full; When welding finishes, the welding slag on weld seam should be knocked out;Uniformly distributed one group of positioning around steel reinforcement cage every 3m in steel reinforcement cage main reinforcement Block;Protection is with a thickness of 5cm;Steel reinforcement cage is fixed with the reinforcing bar of two Φ 12, prevents inclined cage accident distribution life.
As a preference of the present invention, wanting whether close inspection catheter wall has free from flaw, conduit screw thread before the step 8 It is intact;The conduit of crannied conduit, screw thread damage should be replaced immediately, further include installation conduit, when conduit is installed, conduit Clean, the leak to prevent screw thread and sealing ring imprecision is removed at silk mouth and placement leather packing.
As a preference of the present invention, bottom hole sediment thickness is less than 150mm, mud after secondary pile hole cleaning in the step 9 Performance indicator specific gravity < 1.25, viscosity are less than 22s, sand factor < 8%.
As a preference of the present invention, requiring to include in the step 10: after secondary pile hole cleaning, bottom hole sediment thickness is less than 150mm, mud property index specific gravity < 1.25, viscosity are less than 22s, sand factor < 8%;To guarantee that pile body is continuous, complete, nothing is disconnected The defects of stake, interlayer, undergauge, concrete perfusion must be carried out continuously, and the break period must not exceed the concrete initial set time;Using 250 flange form conduit gravity flow concrete perfusion of Φ;Conduit connection wants straight, sealed reliable;Under conduit mouth away from bottom hole 30cm~ 50cm is advisable, and first set pours: beginning quantity is greater than 2m3And continuous placing.
As a preference of the present invention, the step 11 includes test block production and test block maintenance, the test block production is by special People makes test block, and when perfusion randomly selects concrete under the supervision of management, and one group of every pile strictly presses code requirement and operation The program making of guiding book, and making date, pile No. are indicated on it, the test block maintenance includes that test block is made at the scene Afterwards, it is demoulded after being conserved 24 hours at 20 ° of ± 2 temperature and 95% damp condition, the test block after demoulding is by Construction Party's Field representatives Or the common supervision of management and project Quality Inspector are sent to qualified measuring unit mark and are supported to testing after 28 days.
Compared with prior art, the beneficial effects of the present invention are: dry type rotary drilling rig drilling construction of the invention is with low Noise, low vibration, torque are big, speed of fulfiling hole is fast, without mud circulation the advantages that;Suitable for back fill course, argillic horizon, mud, Sandy soils, mud stone, sandstone and short spiral are not easy the stratum containing part cobble, rubble crept into.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described, Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all Belong to the scope of protection of the invention.
Technical solution provided by the invention:
Embodiment 1
A kind of dry type spiral-digging pore bored pile construction method, includes the following steps:
Step 1: the setting-out of stake position:
(1) coordinate points, bench mark and the stake bit plane layout drawing that surveyor provides according to Construction Party carry out axis and stake position Coordinate points mark and are protected in fixed object by major axis mark on surrounding enclosure wall for setting-out;
(2) after surveyor's setting-out, first Project Technical is reported to be responsible for examination;
(3) after Project Technical is responsible for acceptance(check), then the representative of Construction Party building site or management is asked to be checked and accepted;After acceptance(check), warp Both sides responsible person signs approval on stake position setting-out list, and setting-out result is formed information document, can carry out next process Construction;Otherwise, setting-out again;
(4) all piles position hammers into underground 20cm with 12 steel bar end of Φ and marks, and top is coated with red paint, in favor of checking Verification;
(5) stake position setting-out allowable error≤2cm;
(6) bored concrete pile campshed is pacified using the sequence of construction of interval pile, the stake of just completion concreting and adjacent stake pore-forming Full distance, which is no less than 4 times of stake diameter or interval time, should not be less than 36h;
Step 2: shield-tube embedment:
(1) four 16 steel bar ends of Φ are followed closely outside the 0.7m of stake position, its two lines is made to meet at stake position center;
(2) centered on the stake position steel bar end hammered into, the round pool of a 10cm bigger than casing is dug, and bottom will enter undisturbed soil ≥20cm;
(3) when burying casing, tolerance≤20mm of center line and stake position center line, and keep casing vertical;
(4) casing internal diameter is 10cm bigger than stake diameter;
(5) when burying casing, surrounding application clay back-filling in layers compacting, it is ensured that aperture does not collapse, otherwise, casing pine It is dynamic, tilt and lose the effect of cylinder-wall protecting;
(6) after having buried casing, casing absolute altitude suitable for reading is measured one by one, correctly to control stake depth, such as loose fill, casing When easily sinking, casing and drilling machine base are fixed using iron wire;
(7) it after having buried casing, is detected by technical staff, and asks Construction Party or management to check and check and accept;
Step 3: drilling machine is in place:
(1) after drilling machine moves on stake position, by the cross hairs pull-up of stake position surrounding, Rotary table for drilling machine center and stake position centre deviation ≤20mm;
(2) drilling machine bottom pad set sleeper to consolidate it is smooth, to protect drilling machine level firm;
(3) machine squad leader all around corrects drilling machine level with horizontal ruler, and kelly is detected with plummet, squad leader's self-test, matter Inspection person's reinspection, submits a report asking for construction company representative after qualified or management is checked and accepted;After construction company representative or management acceptance(check) and approval of signing It can spud in;
(4) construction of stake position must be spaced away from the stake position of < 3d for pile center or constructed after 24 hours, to prevent perforation accident hair It is raw;
(5) for generated when drilling undergauge, collapse hole the problems such as, using making single waistband three wings prong drill bit by oneself, to avoid Disturbance of the drill bit to hole wall;It is equipped with self-control hole gauge, the variation in pore-forming aperture is monitored in pore forming process, when there is undergauge, collapse hole The problems such as when, the performances such as Ying Tigao drilling slurry viscosity, specific gravity and reduce drilling drilling rate, the construction parameters such as revolving speed, it is ensured that Drilling quality;
Step 4: borehole wall-protection:
(1) it requires hole wall to stablize in drilling, does not collapse;
(2) mud liquid level should keep stable in pore forming process mesoporous;
(3) very soft sill clay drill when be also easy to produce undergauge, collapse hole the problems such as, for this purpose, when drilling in these soil layers Mud balance should be increased to 1.3;
(4) this construction uses original soil pulping, and specific gravity, viscosity are by Quality Inspector's running check, when undesirable, in time It takes measures, cleaning mud pit, sedimentation basin, circulation groove etc., waste pulp are transported outward in time;
(5) if spoiling, hole is serious, and into hole, backfill cohesive soil places redrilling after a period of time;
Step 5: first time borehole cleaning:
(1) bottom hole sediment is required to be completely exhausted out;
(2) drilling tool is above mentioned into 20cm, using the premium mud borehole cleaning of sand factor < 4%, is completely exhausted out bottom hole sediment;
(3) first time borehole cleaning is more than or equal to half an hour;
Step 6: fabrication of reinforcing cage;
Step 7: steel reinforcement cage disposes;
Step 8: checking conduit;
Step 9: secondary pile hole cleaning;
Step 10: filling concrete;
Step 11: concrete sample make and maintenance;
Step 12: mud emission.
In the present embodiment, borehole perpendicularity requirement < 1/100H in step 3, and drill bit uses waist band, guarantees drill bit side To straight down, adds counterweight drilling rod on drill bit top, make drilling rod center of gravity in bottom in drilling, to ensure verticality.
In the present embodiment, step 3 pile cross-section error requires to be 0≤stake diameter Pian Cha≤+ 30mm, and bit size is not small In design stake diameter, every hole terminates Quality Inspector after mentioning brill and is intended to detection outside diameter, and repair welding ensures bit diameter at any time, typical special Different geologic section section uses different rotating speeds for Different Strata, and aperture passes through 1.0m or so under casing using light pressure slow-speed, It is carried out using normal drilling regulation, the cohesive soil to bottom containing sand is using the measure for adding counterweight drilling, quasi- to improve rate of penetration Each pile concrete groundwater increment is really measured, fullness coefficient is calculated, to adjust bit diameter.
Also need to guarantee that effective length meets design requirement in the present embodiment, in step 3, it, must be through Construction Party after the completion of stake holes It represents or management is checked and accepted, accurately measure drilling tool: being the starting point for calculating hole depth at drill bit cone 1/2, and calculate rising for bottom hole sediment Point;It must be measured when every drilling rod decentralization, metering outfit has to pass through verification, after drilling to projected depth, machine squad leader's self-test, matter After inspection person's reinspection, Construction Party, management to site inspection is asked to check and accept, signs and approve after qualified, it can whole hole.
Fabrication of reinforcing cage, which need to be met the requirements, in the present embodiment, in step 6 meets design drawing and " building pile foundation technology rule Model ";Kind, model, the specification of steel must be examined, and design requirement is met;All steel have been intended to quality certificate, and by related rule Surely retrial is sampled;First curved reinforcing bar should be straightened when blanking, strictly accurately control cutting length by the size on attached drawing;Reinforcing bar Cage producer must take appointment with certificate;When steel reinforcement cage is placed, main reinforcement protective layer uses locating piece, every 3m in steel reinforcement cage main reinforcement Uniformly distributed one group of locating piece around steel reinforcement cage;The production of steel reinforcement cage merogenesis, aperture welding are integral.
In the present embodiment, steel reinforcement cage placement needs to meet in step 7: steel reinforcement cage enters Kong Shiying and enters hole in vertical state, alignment Hole location is put down gently slowly;Forbid barbarous operation, plays cage by force;There is commander special messenger during lower cage, must not be hampered by force halfway under It puts, the double-fermented wine feelings that should ascertain the reason processing;When steel reinforcement cage aperture is docked, inconel weld length >=10d, weld seam is full;When welding finishes, Welding slag on weld seam should be knocked out;It is evenly distributed with one group of locating piece around steel reinforcement cage every 3m in steel reinforcement cage main reinforcement;Protect thickness For 5cm;Steel reinforcement cage is fixed with the reinforcing bar of two Φ 12, prevents inclined cage accident distribution life.
In the present embodiment, close inspection catheter wall is wanted to have free from flaw, conduit screw thread whether intact before step 8;For having The conduit in crack, the conduit of screw thread damage should be replaced immediately, further include that installation conduit leads pipe thread mouth and placement when installing conduit Clean, the leak to prevent screw thread and sealing ring imprecision is removed at leather packing.
In the present embodiment, after the secondary pile hole cleaning in step 9, bottom hole sediment thickness is less than 150mm, mud property index ratio Weight < 1.25, viscosity are less than 22s, sand factor < 8%.
In the present embodiment, requiring to include in step 10: after secondary pile hole cleaning, bottom hole sediment thickness is less than 150mm, mud Energy index specific gravity < 1.25, viscosity are less than 22s, sand factor < 8%;For guarantee pile body it is continuous, it is complete, without broken pile, interlayer, undergauge etc. Defect, concrete perfusion must be carried out continuously, and the break period must not exceed the concrete initial set time;It is led using 250 flange form of Φ Pipe gravity flow concrete perfusion;Conduit connection wants straight, sealed reliable;Mouth is advisable away from bottom hole 30cm~50cm under conduit, first set Pour: beginning quantity is greater than 2m3 and continuous placing.
In the present embodiment, step 11 includes test block production and test block maintenance, and the test block production makes test block by special messenger, Concrete, one group of every pile, the stringent journey for pressing code requirement and job instruction are randomly selected when perfusion under the supervision of management Sequence production, and making date, pile No. are indicated on it, the test block maintenance includes after test block is made at the scene, at 20 ° ± 2 It is demoulded after being conserved 24 hours at temperature and 95% damp condition, the test block after demoulding is by Construction Party's Field representatives or management and project The common supervision of Quality Inspector is sent to qualified measuring unit mark and is supported to testing after 28 days.
Further, secondary pile hole cleaning carries out after the installation is completed in conduit, takes direct circulation borehole cleaning.Secondary pile hole cleaning is generally timely It should be by conduit lift-off bottom hole 50cm.Mud amount should be controlled rationally when borehole cleaning, avoid excessive washing away hole wall.
Further include filling concrete:
(1) concrete carries out in 30 minutes immediately after secondary pile hole cleaning.
(2) to guarantee the defects of pile body is continuous, complete, without broken pile, interlayer, undergauge, concrete perfusion must be carried out continuously, Break period must not exceed the concrete initial set time.
(3) 250 flange form conduit gravity flow concrete perfusion of Φ is used.Conduit connection wants straight, sealed reliable;Under conduit Mouth is advisable away from bottom hole 30cm~50cm.
(4) first set pours: beginning quantity is greater than 2m3 and continuous placing.
(5) water proof plug water proof is used, water proof plug diameter is 2cm bigger than conduit diameter.
(6) slump detects, and every pile is at least done 1 time or more.To undesirable concrete, Quality Inspector has the right to refuse It is poured.
(7) it is preferably between 2~6m that conduit bottom, which is embedded in depth in concrete,.
(8) once disassembly conduit must not exceed 6m, is intended to measurement concrete face height before dismantling conduit every time, calculates conduit and bury It is deep, then dismantle.It not promoted blindly, dismantle conduit, conduit the minimum depth 2.0m.
(9) stake top controls: concrete pouring absolute altitude should be than designing 1 times of stake diameter of stake top superelevation, it is ensured that design stake top is design standard Concrete.
(10) pile concrete fullness coefficient cannot be less than 1.1, if analyzing reason, timely correction immediately less than 1.1.
(11) perfusion record: perfusion record is carried out in earnest in time.
Embodiment 2
A kind of dry type spiral-digging pore bored pile construction method, includes the following steps:
Step 1: the setting-out of stake position:
(1) coordinate points, bench mark and the stake bit plane layout drawing that surveyor provides according to Construction Party carry out axis and stake position Coordinate points mark and are protected in fixed object by major axis mark on surrounding enclosure wall for setting-out;
(2) after surveyor's setting-out, first Project Technical is reported to be responsible for examination;
(3) after Project Technical is responsible for acceptance(check), then the representative of Construction Party building site or management is asked to be checked and accepted;After acceptance(check), warp Both sides responsible person signs approval on stake position setting-out list, and setting-out result is formed information document, can carry out next process Construction;Otherwise, setting-out again;
(4) all piles position hammers into underground 20cm with 12 steel bar end of Φ and marks, and top is coated with red paint, in favor of checking Verification;
(5) stake position setting-out allowable error≤2cm;
(6) bored concrete pile campshed is pacified using the sequence of construction of interval pile, the stake of just completion concreting and adjacent stake pore-forming Full distance, which is no less than 4 times of stake diameter or interval time, should not be less than 36h;
Step 2: shield-tube embedment:
(1) four 16 steel bar ends of Φ are followed closely outside the 0.7m of stake position, its two lines is made to meet at stake position center;
(2) centered on the stake position steel bar end hammered into, the round pool of a 10cm bigger than casing is dug, and bottom will enter undisturbed soil ≥20cm;
(3) when burying casing, tolerance≤20mm of center line and stake position center line, and keep casing vertical;
(4) casing internal diameter is 10cm bigger than stake diameter;
(5) when burying casing, surrounding application clay back-filling in layers compacting, it is ensured that aperture does not collapse, otherwise, casing pine It is dynamic, tilt and lose the effect of cylinder-wall protecting;
(6) after having buried casing, casing absolute altitude suitable for reading is measured one by one, correctly to control stake depth, such as loose fill, casing When easily sinking, casing and drilling machine base are fixed using iron wire;
(7) it after having buried casing, is detected by technical staff, and asks Construction Party or management to check and check and accept;
Step 3: drilling machine is in place:
(1) after drilling machine moves on stake position, by the cross hairs pull-up of stake position surrounding, Rotary table for drilling machine center and stake position centre deviation ≤20mm;
(2) drilling machine bottom pad set sleeper to consolidate it is smooth, to protect drilling machine level firm;
(3) machine squad leader all around corrects drilling machine level with horizontal ruler, and kelly is detected with plummet, squad leader's self-test, matter Inspection person's reinspection, submits a report asking for construction company representative after qualified or management is checked and accepted;After construction company representative or management acceptance(check) and approval of signing It can spud in;
(4) construction of stake position must be spaced away from the stake position of < 3d for pile center or constructed after 24 hours, to prevent perforation accident hair It is raw;
(5) for generated when drilling undergauge, collapse hole the problems such as, using making single waistband three wings prong drill bit by oneself, to avoid Disturbance of the drill bit to hole wall;It is equipped with self-control hole gauge, the variation in pore-forming aperture is monitored in pore forming process, when there is undergauge, collapse hole The problems such as when, the performances such as Ying Tigao drilling slurry viscosity, specific gravity and reduce drilling drilling rate, the construction parameters such as revolving speed, it is ensured that Drilling quality;
Step 4: borehole wall-protection:
(1) it requires hole wall to stablize in drilling, does not collapse;
(2) mud liquid level should keep stable in pore forming process mesoporous;
(3) very soft sill clay drill when be also easy to produce undergauge, collapse hole the problems such as, for this purpose, when drilling in these soil layers Mud balance should be increased to 1.3;
(4) this construction uses original soil pulping, and specific gravity, viscosity are by Quality Inspector's running check, when undesirable, in time It takes measures, cleaning mud pit, sedimentation basin, circulation groove etc., waste pulp are transported outward in time;
(5) if spoiling, hole is serious, and into hole, backfill cohesive soil places redrilling after a period of time;
Step 5: first time borehole cleaning:
(1) bottom hole sediment is required to be completely exhausted out;
(2) drilling tool is above mentioned into 20cm, using the premium mud borehole cleaning of sand factor < 4%, is completely exhausted out bottom hole sediment;
(3) first time borehole cleaning is more than or equal to half an hour;
Step 6: fabrication of reinforcing cage;
Step 7: steel reinforcement cage disposes;
Step 8: checking conduit;
Step 9: secondary pile hole cleaning;
Step 10: filling concrete;
Step 11: concrete sample make and maintenance;
Step 12: mud emission.
In the present embodiment, borehole perpendicularity requirement < 1/100H in step 3, and drill bit uses waist band, guarantees drill bit side To straight down, adds counterweight drilling rod on drill bit top, make drilling rod center of gravity in bottom in drilling, to ensure verticality.
In the present embodiment, step 3 pile cross-section error requires to be 0≤stake diameter Pian Cha≤+ 30mm, and bit size is not small In design stake diameter, every hole terminates Quality Inspector after mentioning brill and is intended to detection outside diameter, and repair welding ensures bit diameter at any time, typical special Different geologic section section uses different rotating speeds for Different Strata, and aperture passes through 1.0m or so under casing using light pressure slow-speed, It is carried out using normal drilling regulation, the cohesive soil to bottom containing sand is using the measure for adding counterweight drilling, quasi- to improve rate of penetration Each pile concrete groundwater increment is really measured, fullness coefficient is calculated, to adjust bit diameter.
Also need to guarantee that effective length meets design requirement in the present embodiment, in step 3, it, must be through Construction Party after the completion of stake holes It represents or management is checked and accepted, accurately measure drilling tool: being the starting point for calculating hole depth at drill bit cone 1/2, and calculate rising for bottom hole sediment Point;It must be measured when every drilling rod decentralization, metering outfit has to pass through verification, after drilling to projected depth, machine squad leader's self-test, matter After inspection person's reinspection, Construction Party, management to site inspection is asked to check and accept, signs and approve after qualified, it can whole hole.
Fabrication of reinforcing cage, which need to be met the requirements, in the present embodiment, in step 6 meets design drawing and " building pile foundation technology rule Model ";Kind, model, the specification of steel must be examined, and design requirement is met;All steel have been intended to quality certificate, and by related rule Surely retrial is sampled;First curved reinforcing bar should be straightened when blanking, strictly accurately control cutting length by the size on attached drawing;Reinforcing bar Cage producer must take appointment with certificate;When steel reinforcement cage is placed, main reinforcement protective layer uses locating piece, every 3m in steel reinforcement cage main reinforcement Uniformly distributed one group of locating piece around steel reinforcement cage;The production of steel reinforcement cage merogenesis, aperture welding are integral.
In the present embodiment, steel reinforcement cage placement needs to meet in step 7: steel reinforcement cage enters Kong Shiying and enters hole in vertical state, alignment Hole location is put down gently slowly;Forbid barbarous operation, plays cage by force;There is commander special messenger during lower cage, must not be hampered by force halfway under It puts, the double-fermented wine feelings that should ascertain the reason processing;When steel reinforcement cage aperture is docked, inconel weld length >=10d, weld seam is full;When welding finishes, Welding slag on weld seam should be knocked out;It is evenly distributed with one group of locating piece around steel reinforcement cage every 3m in steel reinforcement cage main reinforcement;Protect thickness For 5cm;Steel reinforcement cage is fixed with the reinforcing bar of two Φ 12, prevents inclined cage accident distribution life.
In the present embodiment, close inspection catheter wall is wanted to have free from flaw, conduit screw thread whether intact before step 8;For having The conduit in crack, the conduit of screw thread damage should be replaced immediately, further include that installation conduit leads pipe thread mouth and placement when installing conduit Clean, the leak to prevent screw thread and sealing ring imprecision is removed at leather packing.
In the present embodiment, after the secondary pile hole cleaning in step 9, bottom hole sediment thickness is less than 150mm, mud property index ratio Weight < 1.25, viscosity are less than 22s, sand factor < 8%.
In the present embodiment, requiring to include in step 10: after secondary pile hole cleaning, bottom hole sediment thickness is less than 150mm, mud Energy index specific gravity < 1.25, viscosity are less than 22s, sand factor < 8%;For guarantee pile body it is continuous, it is complete, without broken pile, interlayer, undergauge etc. Defect, concrete perfusion must be carried out continuously, and the break period must not exceed the concrete initial set time;It is led using 250 flange form of Φ Pipe gravity flow concrete perfusion;Conduit connection wants straight, sealed reliable;Mouth is advisable away from bottom hole 30cm~50cm under conduit, first set Pour: beginning quantity is greater than 2m3 and continuous placing.
In the present embodiment, step 11 includes test block production and test block maintenance, and the test block production makes test block by special messenger, Concrete, one group of every pile, the stringent journey for pressing code requirement and job instruction are randomly selected when perfusion under the supervision of management Sequence production, and making date, pile No. are indicated on it, the test block maintenance includes after test block is made at the scene, at 20 ° ± 2 It is demoulded after being conserved 24 hours at temperature and 95% damp condition, the test block after demoulding is by Construction Party's Field representatives or management and project The common supervision of Quality Inspector is sent to qualified measuring unit mark and is supported to testing after 28 days.
The difference is that drilling depth guarantees that effective length meets design requirement, it, must be through Construction Party's generation after the completion of stake holes Table or management are checked and accepted, and drilling tool is accurately measured: being the starting point for calculating hole depth at drill bit cone 1/2, and calculated the starting point of bottom hole sediment. It must be measured when every drilling rod decentralization, metering outfit has to pass through verification, after drilling to projected depth, machine squad leader's self-test, quality inspection After member's reinspection, Construction Party, management to site inspection is asked to check and accept, signs and approve after qualified, it can whole hole.
Embodiment 3
A kind of dry type spiral-digging pore bored pile construction method, includes the following steps:
Step 1: the setting-out of stake position:
(1) coordinate points, bench mark and the stake bit plane layout drawing that surveyor provides according to Construction Party carry out axis and stake position Coordinate points mark and are protected in fixed object by major axis mark on surrounding enclosure wall for setting-out;
(2) after surveyor's setting-out, first Project Technical is reported to be responsible for examination;
(3) after Project Technical is responsible for acceptance(check), then the representative of Construction Party building site or management is asked to be checked and accepted;After acceptance(check), warp Both sides responsible person signs approval on stake position setting-out list, and setting-out result is formed information document, can carry out next process Construction;Otherwise, setting-out again;
(4) all piles position hammers into underground 20cm with 12 steel bar end of Φ and marks, and top is coated with red paint, in favor of checking Verification;
(5) stake position setting-out allowable error≤2cm;
(6) bored concrete pile campshed is pacified using the sequence of construction of interval pile, the stake of just completion concreting and adjacent stake pore-forming Full distance, which is no less than 4 times of stake diameter or interval time, should not be less than 36h;
Step 2: shield-tube embedment:
(1) four 16 steel bar ends of Φ are followed closely outside the 0.7m of stake position, its two lines is made to meet at stake position center;
(2) centered on the stake position steel bar end hammered into, the round pool of a 10cm bigger than casing is dug, and bottom will enter undisturbed soil ≥20cm;
(3) when burying casing, tolerance≤20mm of center line and stake position center line, and keep casing vertical;
(4) casing internal diameter is 10cm bigger than stake diameter;
(5) when burying casing, surrounding application clay back-filling in layers compacting, it is ensured that aperture does not collapse, otherwise, casing pine It is dynamic, tilt and lose the effect of cylinder-wall protecting;
(6) after having buried casing, casing absolute altitude suitable for reading is measured one by one, correctly to control stake depth, such as loose fill, casing When easily sinking, casing and drilling machine base are fixed using iron wire;
(7) it after having buried casing, is detected by technical staff, and asks Construction Party or management to check and check and accept;
Step 3: drilling machine is in place:
(1) after drilling machine moves on stake position, by the cross hairs pull-up of stake position surrounding, Rotary table for drilling machine center and stake position centre deviation ≤20mm;
(2) drilling machine bottom pad set sleeper to consolidate it is smooth, to protect drilling machine level firm;
(3) machine squad leader all around corrects drilling machine level with horizontal ruler, and kelly is detected with plummet, squad leader's self-test, matter Inspection person's reinspection, submits a report asking for construction company representative after qualified or management is checked and accepted;After construction company representative or management acceptance(check) and approval of signing It can spud in;
(4) construction of stake position must be spaced away from the stake position of < 3d for pile center or constructed after 24 hours, to prevent perforation accident hair It is raw;
(5) for generated when drilling undergauge, collapse hole the problems such as, using making single waistband three wings prong drill bit by oneself, to avoid Disturbance of the drill bit to hole wall;It is equipped with self-control hole gauge, the variation in pore-forming aperture is monitored in pore forming process, when there is undergauge, collapse hole The problems such as when, the performances such as Ying Tigao drilling slurry viscosity, specific gravity and reduce drilling drilling rate, the construction parameters such as revolving speed, it is ensured that Drilling quality;
Step 4: borehole wall-protection:
(1) it requires hole wall to stablize in drilling, does not collapse;
(2) mud liquid level should keep stable in pore forming process mesoporous;
(3) very soft sill clay drill when be also easy to produce undergauge, collapse hole the problems such as, for this purpose, when drilling in these soil layers Mud balance should be increased to 1.3;
(4) this construction uses original soil pulping, and specific gravity, viscosity are by Quality Inspector's running check, when undesirable, in time It takes measures, cleaning mud pit, sedimentation basin, circulation groove etc., waste pulp are transported outward in time;
(5) if spoiling, hole is serious, and into hole, backfill cohesive soil places redrilling after a period of time;
Step 5: first time borehole cleaning:
(1) bottom hole sediment is required to be completely exhausted out;
(2) drilling tool is above mentioned into 20cm, using the premium mud borehole cleaning of sand factor < 4%, is completely exhausted out bottom hole sediment;
(3) first time borehole cleaning is more than or equal to half an hour;
Step 6: fabrication of reinforcing cage;
Step 7: steel reinforcement cage disposes;
Step 8: checking conduit;
Step 9: secondary pile hole cleaning;
Step 10: filling concrete;
Step 11: concrete sample make and maintenance;
Step 12: mud emission.
In the present embodiment, borehole perpendicularity requirement < 1/100H in step 3, and drill bit uses waist band, guarantees drill bit side To straight down, adds counterweight drilling rod on drill bit top, make drilling rod center of gravity in bottom in drilling, to ensure verticality.
In the present embodiment, step 3 pile cross-section error requires to be 0≤stake diameter Pian Cha≤+ 30mm, and bit size is not small In design stake diameter, every hole terminates Quality Inspector after mentioning brill and is intended to detection outside diameter, and repair welding ensures bit diameter at any time, typical special Different geologic section section uses different rotating speeds for Different Strata, and aperture passes through 1.0m or so under casing using light pressure slow-speed, It is carried out using normal drilling regulation, the cohesive soil to bottom containing sand is using the measure for adding counterweight drilling, quasi- to improve rate of penetration Each pile concrete groundwater increment is really measured, fullness coefficient is calculated, to adjust bit diameter.
Also need to guarantee that effective length meets design requirement in the present embodiment, in step 3, it, must be through Construction Party after the completion of stake holes It represents or management is checked and accepted, accurately measure drilling tool: being the starting point for calculating hole depth at drill bit cone 1/2, and calculate rising for bottom hole sediment Point;It must be measured when every drilling rod decentralization, metering outfit has to pass through verification, after drilling to projected depth, machine squad leader's self-test, matter After inspection person's reinspection, Construction Party, management to site inspection is asked to check and accept, signs and approve after qualified, it can whole hole.
Fabrication of reinforcing cage, which need to be met the requirements, in the present embodiment, in step 6 meets design drawing and " building pile foundation technology rule Model ";Kind, model, the specification of steel must be examined, and design requirement is met;All steel have been intended to quality certificate, and by related rule Surely retrial is sampled;First curved reinforcing bar should be straightened when blanking, strictly accurately control cutting length by the size on attached drawing;Reinforcing bar Cage producer must take appointment with certificate;When steel reinforcement cage is placed, main reinforcement protective layer uses locating piece, every 3m in steel reinforcement cage main reinforcement Uniformly distributed one group of locating piece around steel reinforcement cage;The production of steel reinforcement cage merogenesis, aperture welding are integral.
In the present embodiment, steel reinforcement cage placement needs to meet in step 7: steel reinforcement cage enters Kong Shiying and enters hole in vertical state, alignment Hole location is put down gently slowly;Forbid barbarous operation, plays cage by force;There is commander special messenger during lower cage, must not be hampered by force halfway under It puts, the double-fermented wine feelings that should ascertain the reason processing;When steel reinforcement cage aperture is docked, inconel weld length >=10d, weld seam is full;When welding finishes, Welding slag on weld seam should be knocked out;It is evenly distributed with one group of locating piece around steel reinforcement cage every 3m in steel reinforcement cage main reinforcement;Protect thickness For 5cm;Steel reinforcement cage is fixed with the reinforcing bar of two Φ 12, prevents inclined cage accident distribution life.
In the present embodiment, close inspection catheter wall is wanted to have free from flaw, conduit screw thread whether intact before step 8;For having The conduit in crack, the conduit of screw thread damage should be replaced immediately, further include that installation conduit leads pipe thread mouth and placement when installing conduit Clean, the leak to prevent screw thread and sealing ring imprecision is removed at leather packing.
In the present embodiment, after the secondary pile hole cleaning in step 9, bottom hole sediment thickness is less than 150mm, mud property index ratio Weight < 1.25, viscosity are less than 22s, sand factor < 8%.
In the present embodiment, requiring to include in step 10: after secondary pile hole cleaning, bottom hole sediment thickness is less than 150mm, mud Energy index specific gravity < 1.25, viscosity are less than 22s, sand factor < 8%;For guarantee pile body it is continuous, it is complete, without broken pile, interlayer, undergauge etc. Defect, concrete perfusion must be carried out continuously, and the break period must not exceed the concrete initial set time;It is led using 250 flange form of Φ Pipe gravity flow concrete perfusion;Conduit connection wants straight, sealed reliable;Mouth is advisable away from bottom hole 30cm~50cm under conduit, first set Pour: beginning quantity is greater than 2m3 and continuous placing.
In the present embodiment, step 11 includes test block production and test block maintenance, and the test block production makes test block by special messenger, Concrete, one group of every pile, the stringent journey for pressing code requirement and job instruction are randomly selected when perfusion under the supervision of management Sequence production, and making date, pile No. are indicated on it, the test block maintenance includes after test block is made at the scene, at 20 ° ± 2 It is demoulded after being conserved 24 hours at temperature and 95% damp condition, the test block after demoulding is by Construction Party's Field representatives or management and project The common supervision of Quality Inspector is sent to qualified measuring unit mark and is supported to testing after 28 days.
It is deposited on smooth clean ground specifically, muscle cage should lie down, stacks the number of plies and be not to be exceeded 2 layers, steel reinforcement cage Outer dimension should meet design requirement, and tolerance meets the following requirements following table.
Fabrication of reinforcing cage, installation tolerance table
Item Project Tolerance (mm)
1 Main reinforcement spacing ±10
2 Stirrup, spiral bar spacing ±20
3 Steel reinforcement cage diameter ±10
4 Steel reinforcement cage entire length ±100
Parameter in 3 groups of embodiment work progress is compared into experiment, after a period of time, the correlation data obtained is such as Under:
Compared by above-mentioned experimental data it can be concluded that, the tool of dry type spiral-digging pore bored pile construction method of the invention Have the advantages that efficient, energy saving, low noise, low pollution, ground adaptability be wider, favors by more and more units in charge of construction.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry For personnel it should be appreciated that the present invention is not limited to the above embodiments, described in the above embodiment and specification is only the present invention Preference, be not intended to limit the invention, without departing from the spirit and scope of the present invention, the present invention also has various Changes and improvements, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by institute Attached claims and its equivalent thereof.

Claims (10)

1. a kind of dry type spiral-digging pore bored pile construction method, characterized by the following steps:
Step 1: the setting-out of stake position:
(1) coordinate points, bench mark and the stake bit plane layout drawing that surveyor provides according to Construction Party carry out axis and the setting-out of stake position, By major axis mark on surrounding enclosure wall, coordinate points mark and are protected in fixed object;
(2) after surveyor's setting-out, first Project Technical is reported to be responsible for examination;
(3) after Project Technical is responsible for acceptance(check), then the representative of Construction Party building site or management is asked to be checked and accepted;After acceptance(check), through both sides Responsible person signs approval on stake position setting-out list, and setting-out result is formed information document, can carry out applying for next process Work;Otherwise, setting-out again;
(4) all piles position hammers into underground 20cm with 12 steel bar end of Φ and marks, and top is coated with red paint, in favor of checking core It is right;
(5) stake position setting-out allowable error≤2cm;
(6) bored concrete pile campshed using interval pile sequence of construction, just complete concreting stake and adjacent stake pore-forming safety away from Stake diameter or interval time from no less than 4 times should not be less than 36h;
Step 2: shield-tube embedment:
(1) four 16 steel bar ends of Φ are followed closely outside the 0.7m of stake position, its two lines is made to meet at stake position center;
(2) centered on the stake position steel bar end hammered into, dig a 10cm bigger than casing round pool, and bottom will enter undisturbed soil >= 20cm;
(3) when burying casing, tolerance≤20mm of center line and stake position center line, and keep casing vertical;
(4) casing internal diameter is 10cm bigger than stake diameter;
(5) when burying casing, surrounding application clay back-filling in layers compacting, it is ensured that aperture does not collapse, and otherwise, casing loosens, and inclines Tiltedly lose the effect of cylinder-wall protecting;
(6) after having buried casing, casing absolute altitude suitable for reading is measured one by one, correctly to control stake depth, such as loose fill, under casing is easy When heavy, casing and drilling machine base are fixed using iron wire;
(7) it after having buried casing, is detected by technical staff, and asks Construction Party or management to check and check and accept;
Step 3: drilling machine is in place:
(1) after drilling machine moves on stake position, by the cross hairs pull-up of stake position surrounding, Rotary table for drilling machine center and stake position centre deviation≤ 20mm;
(2) drilling machine bottom pad set sleeper to consolidate it is smooth, to protect drilling machine level firm;
(3) machine squad leader all around corrects drilling machine level with horizontal ruler, and kelly is detected with plummet, squad leader's self-test, Quality Inspector Reinspection, submits a report asking for construction company representative after qualified or management is checked and accepted;It can after construction company representative or management acceptance(check) and approval of signing It spuds in;
(4) construction of stake position must be spaced away from the stake position of < 3d for pile center or constructed after 24 hours, to prevent the accident of perforating;
(5) for generated when drilling undergauge, collapse hole the problems such as, using single waistband three wings prong drill bit is made by oneself, to avoid drill bit Disturbance to hole wall;It is equipped with self-control hole gauge, the variation in pore-forming aperture is monitored in pore forming process, is asked when there is undergauge, collapse hole etc. When topic, the construction parameters such as the performances such as Ying Tigao drilling slurry viscosity, specific gravity and reduction drilling drilling rate, revolving speed, it is ensured that drilling Quality;
Step 4: borehole wall-protection:
(1) it requires hole wall to stablize in drilling, does not collapse;
(2) mud liquid level should keep stable in pore forming process mesoporous;
(3) very soft sill clay drill when be also easy to produce undergauge, collapse hole the problems such as, for this purpose, the Shi Yingjia that drills in these soil layers Big mud balance is to 1.3;
(4) this construction uses original soil pulping, and specific gravity, viscosity when undesirable, are taken in time by Quality Inspector's running check Measure, cleaning mud pit, sedimentation basin, circulation groove etc., waste pulp are transported outward in time;
(5) if spoiling, hole is serious, and into hole, backfill cohesive soil places redrilling after a period of time;
Step 5: first time borehole cleaning:
(1) bottom hole sediment is required to be completely exhausted out;
(2) drilling tool is above mentioned into 20cm, using the premium mud borehole cleaning of sand factor < 4%, is completely exhausted out bottom hole sediment;
(3) first time borehole cleaning is more than or equal to half an hour;
Step 6: fabrication of reinforcing cage;
Step 7: steel reinforcement cage disposes;
Step 8: checking conduit;
Step 9: secondary pile hole cleaning;
Step 10: filling concrete;
Step 11: concrete sample make and maintenance;
Step 12: mud emission.
2. dry type spiral-digging pore bored pile construction method according to claim 1, it is characterised in that: the step 3 Middle borehole perpendicularity requirement < 1/100H, and drill bit uses waist band, guarantees drill bit direction straight down, adds on drill bit top and match It is redrilled bar, makes drilling rod center of gravity in bottom in drilling, to ensure verticality.
3. dry type spiral-digging pore bored pile construction method according to claim 1, it is characterised in that: the step 3 Pile cross-section error requires to be 0≤stake diameter Pian Cha≤+ 30mm, and bit size, not less than design stake diameter, every hole terminates after mentioning brill Quality Inspector is intended to detection outside diameter, and repair welding ensures bit diameter at any time, in typical special geology section section, for Different Strata Using different rotating speeds, aperture passes through 1.0m or so under casing using light pressure slow-speed, is carried out using normal drilling regulation, the bottom of to Cohesive soil of the portion containing sand is counted using adding the measure of counterweight drilling accurately to measure each pile concrete groundwater increment to improve rate of penetration Fullness coefficient is calculated, to adjust bit diameter.
4. dry type spiral-digging pore bored pile construction method according to claim 1, it is characterised in that: the step 3 In also need to guarantee that effective length meets design requirement, after the completion of stake holes, must be checked and accepted through construction company representative or management, accurately measure brill Tool: it is the starting point for calculating hole depth at drill bit cone 1/2, and calculates the starting point of bottom hole sediment;It must be measured when every drilling rod decentralization, Metering outfit has to pass through verification, and after drilling to projected depth, machine squad leader's self-test asks Construction Party, management to arrive after Quality Inspector's reinspection Site inspection is checked and accepted, and is signed and is approved after qualified, can whole hole.
5. dry type spiral-digging pore bored pile construction method according to claim 1, it is characterised in that: the step 6 Middle fabrication of reinforcing cage, which need to be met the requirements, meets design drawing and " technical code for building pile foundation ";Kind, model, the specification of steel are equal It must examine, meet design requirement;All steel have been intended to quality certificate, and sample retrial by pertinent regulations;It should first will be curved when blanking Bent reinforcing bar alignment, strictly accurately controls cutting length by the size on attached drawing;Fabrication of reinforcing cage personnel must take appointment with certificate;Steel When muscle cage is placed, main reinforcement protective layer uses locating piece, uniformly distributed one group of positioning around steel reinforcement cage every 3m in steel reinforcement cage main reinforcement Block;The production of steel reinforcement cage merogenesis, aperture welding are integral.
6. dry type spiral-digging pore bored pile construction method according to claim 1, it is characterised in that: the step 7 Middle steel reinforcement cage placement needs to meet: steel reinforcement cage enters Kong Shiying and enters hole in vertical state, and alignment hole location is put down gently slowly;Forbid barbarous work Industry plays cage by force;There is commander special messenger during lower cage, must not be hampered halfway and transfer by force, the double-fermented wine feelings that should ascertain the reason processing;Steel When muscle cage aperture is docked, inconel weld length >=10d, weld seam is full;When welding finishes, the welding slag on weld seam should be knocked out;? It is evenly distributed with one group of locating piece in steel reinforcement cage main reinforcement around steel reinforcement cage every 3m;Protection is with a thickness of 5cm;Two Φ 12 of steel reinforcement cage Reinforcing bar fixed, prevent the distribution life of inclined cage accident.
7. dry type spiral-digging pore bored pile construction method according to claim 1, it is characterised in that: the step 8 Close inspection catheter wall is wanted to have free from flaw, conduit screw thread whether intact before;For the conduit of crannied conduit, screw thread damage It should replace immediately, further include installation conduit, when installing conduit, leading pipe thread mouth and placing will be removed at leather packing completely, to prevent screw thread With sealing ring imprecision and leak.
8. dry type spiral-digging pore bored pile construction method according to claim 1, it is characterised in that: the step 9 In secondary pile hole cleaning after, bottom hole sediment thickness be less than 150mm, mud property index specific gravity < 1.25, viscosity be less than 22s, sand factor < 8%.
9. dry type spiral-digging pore bored pile construction method according to claim 1, it is characterised in that: the step 10 In require to include: after secondary pile hole cleaning, bottom hole sediment thickness is less than 150mm, and mud property index specific gravity < 1.25, viscosity is less than 22s, sand factor < 8%;To guarantee the defects of pile body is continuous, complete, without broken pile, interlayer, undergauge, concrete perfusion must be continuous It carries out, the break period must not exceed the concrete initial set time;Using 250 flange form conduit gravity flow concrete perfusion of Φ;Conduit Connection wants straight, sealed reliable;Mouth is advisable away from bottom hole 30cm~50cm under conduit, and first set pours: beginning quantity is greater than 2m3And it is continuous It pours.
10. dry type spiral-digging pore bored pile construction method according to claim 1, it is characterised in that: the step 11 include test block production and test block maintenance, and test block production makes test block by special messenger, when perfusion under the supervision of management with Machine extracts concrete, one group of every pile, the stringent program making for pressing code requirement and job instruction, and indicates production on it Date, pile No., the test block maintenance include conserving at 20 ° of ± 2 temperature and 95% damp condition after test block is made at the scene It is demoulded after 24 hours, the test block after demoulding is sent by the common supervision of Construction Party's Field representatives or management and project Quality Inspector to there is money The measuring unit mark of matter is supported to testing after 28 days.
CN201811466933.4A 2018-12-03 2018-12-03 A kind of dry type spiral-digging pore bored pile construction method Pending CN109577319A (en)

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Publication number Priority date Publication date Assignee Title
CN104895055A (en) * 2015-05-26 2015-09-09 江苏省建筑科学研究院有限公司 Building grouting pile foundation construction method
CN107165160A (en) * 2017-07-19 2017-09-15 上海宝冶集团有限公司 Electric drill bores construction filling pile construction engineering method with rotary digging relay

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