CN111364450A - Construction method of PHC pile in strong-cementing stratum - Google Patents
Construction method of PHC pile in strong-cementing stratum Download PDFInfo
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- CN111364450A CN111364450A CN202010208467.0A CN202010208467A CN111364450A CN 111364450 A CN111364450 A CN 111364450A CN 202010208467 A CN202010208467 A CN 202010208467A CN 111364450 A CN111364450 A CN 111364450A
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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
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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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
- E02D5/58—Prestressed concrete piles
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Abstract
The invention discloses a construction method of a PHC pile in a strong cemented stratum, which comprises the steps of piling a plurality of PHC pipe piles until the head end of a lower pile is in contact with the upper surface of the strong cemented stratum, arranging a drill bit in a pile hole of the lower pile to drill the strong cemented stratum, and continuously installing the PHC pipe piles at the tail end of the lower pile after the drill hole penetrates through the strong cemented stratum to carry out piling construction until the head end of the lower pile is sunk to a first preset depth. According to the method, the PHC tubular pile construction is carried out on the upper part of the strong cemented stratum, then the hole is led in the pile hole, the subsequent PHC tubular pile construction is carried out after the strong cemented stratum is penetrated, the probability that the pile is broken in the strong cemented stratum such as alkaline strong cemented soil, iron strong cemented soil and the like in the PHC pile construction injection process is reduced, the construction efficiency is improved, and the quality problems of hole collapse, large pile deviation, over-standard verticality deviation and the like cannot occur when a drilling machine is used for leading the hole in the pile hole.
Description
Technical Field
The invention relates to the technical field of PHC construction, in particular to a construction method of a PHC pile in a strong cementing stratum.
Background
When the PHC pile construction meets an alkaline strong-cementation and iron strong-cementation soil layer, a spiral drilling machine is generally adopted to pre-drill holes and take out soil, and then the PHC pile construction is carried out.
Disclosure of Invention
In view of the above, a first object of the present invention is to provide a method for constructing a PHC pile in a strong cemented stratum, so as to solve the problems that when the existing PHC pile construction encounters the strong cemented stratum, drilling is adopted to extract soil, then PHC pile driving construction is performed, the construction speed is slow, hole collapse is easy to occur, and the like.
In order to achieve the first object, the invention provides the following technical scheme:
a construction method of a PHC pile in a strong cementing stratum comprises the following steps:
piling a plurality of PHC tubular piles to enable the head ends of the lower pile sections to be in contact with the upper surface of the strong cementing stratum;
arranging a drill rod and a drill bit connected with the drill rod in a pile hole of the lower pile section, and lowering the drill rod to enable the drill bit to move to the bottom of the pile hole;
driving the drill bit to drill the strong cementing stratum through a drilling machine;
drilling penetrates behind the strong cemented formation the tail end of the lower pile continues to be installed the PHC tubular pile and carries out piling construction until the head end of the lower pile sinks to a first preset depth.
Preferably, the diameter of the drill bit is smaller than the diameter of the pile hole.
Preferably, the drilling machine drives the drill bit to drill the strong cementing stratum, and the drilling method specifically comprises the following steps:
the drilling machine is driven by the drilling machine to drill at low pressure in a slow rotation mode when the drill bit is used for drilling holes, and the pile holes are drilled in a backwater mode;
and the pile outlet end of the drill bit adopts a mud retaining wall to drill.
Preferably, after the drill bit is driven by the drilling machine to drill the strong cemented stratum, the method further comprises:
after the hole forming process is finished, lifting the drill rod up and down to clean the hole;
after drilling, checking the hole forming quality and recording the hole forming;
and reducing the mud in the pile hole by a second preset depth through a mud pump for the hole which meets the quality requirement.
Preferably, the PHC pile is installed at the end of the lower pile after the drill hole penetrates through the strong cemented stratum, and the length of the PHC pile is greater than or equal to the thickness of the strong cemented stratum, so that the lower pile penetrates through the lower surface of the strong cemented stratum after the pile is driven.
Preferably, after the drilling hole penetrates through the strong cemented formation and the PHC pile is continuously installed at the end of the lower pile and pile driving construction is performed, the method further comprises:
and any PHC tubular pile which is continuously installed is used for pumping water into the pile hole after piling construction, so that air is reserved between the top surface of the soil plug in the pile hole and the pile hammer.
Preferably, carry out pile construction to a plurality of PHC tubular pile, specifically include:
hooking and hanging the PHC tubular pile to a pile-taking safety region of the pile machine through two ends of a crane;
hoisting the PHC tubular pile, and feeding the PHC tubular pile through the cooperation of an auxiliary machine;
after the PHC tubular pile of the first section is hoisted, pile tips are aligned with a ground pile position marker for pile inserting and positioning;
and forming a lower pile section after hammering the pile sinking, hoisting the upper pile section and aligning the lower pile section for electric welding pile splicing.
Preferably, lift by crane the upper segment stake and aim at lower segment stake carry out electric welding pile connection, specifically include:
before welding, carrying out rust removal and polishing on embedded parts of pile heads of the upper pile and the lower pile;
when the lower section of pile sinks to a height of 0.5-0.8 m from the ground, welding reinforcing steel bar heads on the pile head embedded parts of the lower section of pile;
and (4) welding after aligning the verticality of the upper section pile and the lower section pile.
Preferably, the center deviation of the upper pile and the lower pile is not more than 5mm, the node bending rise is not more than 0.1% of the pile length and not more than 20mm, and the joint surface gap is not more than 2 mm.
Preferably, the welding is carried out after aligning the straightness that hangs down of upper segment stake and lower segment stake specifically includes:
and (3) symmetrically spot-welding along the circumference of the connector during welding, and performing layered welding after the upper section pile and the lower section pile are fixed, wherein the number of welding layers is at least two.
The invention provides a construction method of a PHC pile in a strong cementing stratum, which comprises the following steps: piling a plurality of PHC tubular piles to enable the head ends of the lower pile sections to be in contact with the upper surface of the strong cementing stratum; arranging a drill rod and a drill bit connected with the drill rod in a pile hole of the lower section of pile, and lowering the drill rod to enable the drill bit to move to the bottom of the pile hole; driving a drill bit to drill a strong cemented stratum through a drilling machine; and after the drill hole penetrates through the strong cemented stratum, continuously installing the PHC pipe pile at the tail end of the lower pile, and performing pile driving construction until the head end of the lower pile sinks to a first preset depth.
The PHC pile construction method in the strong cemented stratum provided by the invention is applied, a plurality of PHC pipe piles are driven until the head end of the next pile is in contact with the upper surface of the strong cemented stratum, a drill bit is arranged in a pile hole of the next pile to drill the strong cemented stratum, and after the drill hole penetrates through the strong cemented stratum, the PHC pipe piles are continuously installed at the tail end of the next pile to carry out pile driving construction until the head end of the next pile is sunk to a first preset depth. According to the method, the PHC tubular pile construction is carried out on the upper part of the strong cemented stratum, then the hole is led in the pile hole, the subsequent PHC tubular pile construction is carried out after the strong cemented stratum is penetrated, the probability that the pile is broken in the strong cemented stratum such as alkaline strong cemented soil, iron strong cemented soil and the like in the PHC pile construction injection process is reduced, the construction efficiency is improved, and the quality problems of hole collapse, large pile deviation, over-standard verticality deviation and the like cannot occur when a drilling machine is used for leading the hole in the pile hole.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a PHC pile construction method in a strong cementing stratum according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention discloses a construction method of a PHC pile in a strong cemented stratum, and aims to solve the problems that when the existing PHC pile construction meets the strong cemented stratum, drilling is adopted to take soil, then PHC pile driving construction is carried out, the construction speed is low, hole collapse is easy to occur, and the like.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a PHC pile construction method in a strong cementing stratum according to an embodiment of the present invention.
In a specific embodiment, the invention provides a method for constructing a PHC pile in a strong cementing stratum, which comprises the following steps:
s11: piling a plurality of PHC tubular piles to enable the head ends of the lower pile sections to be in contact with the upper surface of the strong cementing stratum;
the thickness of the soil layer on the upper portion of the strong cementing stratum is analyzed through geological survey data, the number of the PHC tubular piles is set, the PHC tubular piles hammer and sink piles to form lower piles, and when the head ends of the lower piles are in contact with the upper surface of the strong cementing stratum, the engineering drilling machine is in place. The body of the drilling machine must be firm, and the drilling machine cannot be displaced or inclined in the construction process. The next step S12 is executed.
S12: arranging a drill rod and a drill bit connected with the drill rod in a pile hole of the lower section of pile, and lowering the drill rod to enable the drill bit to move to the bottom of the pile hole;
s13: driving a drill bit to drill a strong cemented stratum through a drilling machine;
before hole leading construction, arranging a slurry circulating system near an auxiliary pile sinking area needing hole leading; carrying out full load debugging and operation in a drilling cavity; and drilling parameters (rotating speed, bit pressure and drilling speed) are reasonably controlled during drilling.
S14: and after the drill hole penetrates through the strong cemented stratum, continuously installing the PHC pipe pile at the tail end of the lower pile, and performing pile driving construction until the head end of the lower pile sinks to a first preset depth.
In the pile driving construction, reference may be made to S11, and the first preset depth is a preset depth according to work requirements.
The PHC pile construction method in the strong cemented stratum provided by the invention is applied, a plurality of PHC pipe piles are driven until the head end of the next pile is in contact with the upper surface of the strong cemented stratum, a drill bit is arranged in a pile hole of the next pile to drill the strong cemented stratum, and after the drill hole penetrates through the strong cemented stratum, the PHC pipe piles are continuously installed at the tail end of the next pile to carry out pile driving construction until the head end of the next pile is sunk to a first preset depth. According to the method, the PHC tubular pile construction is carried out on the upper part of the strong cemented stratum, then the hole is led in the pile hole, the subsequent PHC tubular pile construction is carried out after the strong cemented stratum is penetrated, the probability that the pile is broken in the strong cemented stratum such as alkaline strong cemented soil, iron strong cemented soil and the like in the PHC pile construction injection process is reduced, the construction efficiency is improved, and the quality problems of hole collapse, large pile deviation, over-standard verticality deviation and the like cannot occur when a drilling machine is used for leading the hole in the pile hole.
Specifically, in order to prevent hole collapse, the diameter of drill bit is less than the diameter setting in stake hole, and the drill bit is at the aspect drilling in strong cement stratum, and the diameter of drilling is less than the diameter in stake hole for promote the lower section stake to passing strong cement stratum through thrust when the pile is driven, it is a transition fit's mode, makes strong cement stratum carry out the fixed stay to the lower section stake, prevents that the too big problem that produces the straightness deviation of hanging down of lower section stake skew position simultaneously.
Further, drive the drill bit through the rig and drill the strong cemented formation, specifically include:
when the drill drives the drill bit to open the hole, drilling at low pressure by slow rotation, and drilling in the pile hole in a backwater mode;
and the pile outlet end of the drill bit adopts mud to protect the wall for drilling.
When the hole is formed, construction is carried out strictly according to operation rules, low-pressure and slow rotation is adopted when the hole is opened and drilled, the drilling pressure is properly increased in sand layer soil, and the drilling speed is slowed down. Drilling in a pile hole in a backwater mode, and drilling by adopting a mud retaining wall after a drill bit is discharged from the pile end; if the engineering sandy soil particles are large, the pipe is easy to block in the drilled hole, and bentonite can be doped in the slurry in the drilling process after the drill bit goes out of the pile end; the drilling speed in the drilling hole is fast and slow, and the performance and index of the wall protection slurry are changed according to the soil property condition of the actual stratum. The difficulty of pore-forming is large, and the specific gravity and viscosity of the slurry should be increased during construction. In the pore-forming process, the circulation ditch of the mud pit is frequently dredged, and the waste mud is regularly cleaned and transported outwards in time.
Furthermore, after the drill bit is driven by the drilling machine to drill the strong cemented stratum, the method further comprises the following steps:
after the pore-forming process is finished, lifting the drill rod up and down to clean the pores so as to reduce sediment;
after drilling, checking the hole forming quality and recording the hole forming;
and reducing the slurry in the pile hole by a slurry pump to a second preset depth for the hole-forming meeting the quality requirement, so as to prevent the 'water hammer effect' from occurring during pile construction, wherein the second preset depth can be set according to the distance between the slurry surface and the top surface.
On the basis of the above embodiments, the length of the PHC tubular pile continuously installed at the tail end of the lower pile after the drill hole penetrates through the strong cemented stratum is greater than or equal to the thickness of the strong cemented stratum, so that the lower pile after the pile is driven penetrates through the lower surface of the strong cemented stratum, and the length of the PHC tubular pile is set according to the ground survey, so that the lower pile after the pile is driven can penetrate from the upper surface to the lower surface of the strong cemented stratum at one time.
In one embodiment, after drilling the hole to penetrate the strong cemented stratum and then continuously installing the PHC pile at the end of the next pile and performing pile driving, the method further comprises:
any PHC tubular pile which is continuously installed pumps water to the pile hole after piling construction, so that air is left between the top surface of the soil plug in the pile hole and the pile hammer, and the number and the length of the PHC tubular piles which are continuously installed are set according to requirements.
Wherein, carry out pile construction to a plurality of PHC tubular pile, specifically include:
hooking and lifting the PHC tubular pile to a pile lifting safety area of the pile machine through two ends of a crane;
hoisting the PHC tubular pile, and feeding the PHC tubular pile through the cooperation of an auxiliary machine;
after the first PHC pipe pile is lifted, pile tips are aligned with ground pile position markers for pile inserting and positioning;
and forming a lower pile section after hammering the pile sinking, hoisting the upper pile section and performing electric welding pile splicing by aiming at the lower pile section.
Further, lift by crane the upper segment stake and aim at lower segment stake and carry out electric welding pile extension, specifically include:
carrying out rust removal and polishing on pile head embedded parts of an upper pile and a lower pile before welding;
when the lower section of pile sinks to the height of 0.5-0.8 m from the ground, welding a reinforcing steel bar head on the pile head embedded part of the lower section of pile;
and (5) welding after aligning the verticality of the upper pile and the lower pile.
Preferably, the center deviation of the upper pile and the lower pile is not more than 5mm, the node bending rise is not more than 0.1% of the pile length and not more than 20mm, and the joint surface gap is not more than 2 mm.
In one embodiment, weld after the straightness that hangs down of section stake and lower section stake on the alignment, specifically include:
during welding, symmetrical spot welding is carried out along the circumference of the connector, and welding is carried out in a layered mode after the upper section pile and the lower section pile are fixed, wherein the number of welding layers is at least two.
In one embodiment, the construction process comprises:
construction preparation → pile position lofting → pile driver position, PHC pile construction on the upper part of the alkaline strong cementing and iron strong cementing soil layer → geological drilling machine position and drilling → pile driver position and residual pile construction → pile feeding.
Preferably, the specific steps include:
1) preparation for construction
a. And (4) selecting pile driving equipment and hole guiding equipment according to project geological conditions and construction experience.
b. Selecting a pile cap with the inner diameter being 5-10 mm larger than the pile diameter, opening an air vent on the pile cap, coiling a plurality of layers of steel wire ropes with the diameter not less than 25cm in a basin opening on the pile cap to be used as a hammer pad, selecting a paper pad as a pile pad material, compacting the paper pad with the thickness not less than 15cm, and carrying out one pile pad (replacing the paper pad by sections if necessary).
c. And well connecting the power supply and the water source.
2) Pile position lofting
a. And for measuring reference points, datum lines, elevation and other points, rechecking step by step is required, and accurate measurement and paying-off can be carried out according to the rechecking and approval.
b. The measurement construction complies with the regulations of engineering measurement Specifications GB 50026-2007.
c. The measuring instrument must be qualified by the instrument qualification department to provide a valid certificate of qualification.
d. The measurement operator must be trained and certified for post work.
e. According to the design drawing and the measurement control points, each pile position is accurately put in by a measuring instrument, the steel bar head is used for marking, red paint is used for marking on the steel bar head, and lime is used for marking on the ground.
f. And controlling the measurement lofting and releasing precision within 1cm, drawing a measurement result diagram, and submitting to a supervision for rechecking.
g. After the pile position is qualified through supervision, reexamination and inspection, the pile position can be handed over to a construction team to carry out pile foundation construction.
h. The construction team needs to be rechecked again before the pile inserting operation is performed, and the accuracy of the pile position is guaranteed.
3) Pile driver is in place, and PHC pile construction is carried out on the upper portion of alkaline strong-cementation and iron strong-cementation soil layer
a: pile driver is in place
And steel plates are laid on the lower part of the pile driver, and certain flatness is ensured.
b: hanging pile
A crane is adopted to hoist the pile into the pile-taking safety distance range of the pile machine before the pile machine, and the PHC concrete pipe pile is hoisted by adopting hooks at two ends;
when the pile is lifted, the pile needs to be lifted lightly, so that the pile is prevented from being bumped, the vibration is reduced, and the pile body is prevented from being cracked;
checking and verifying the appearance quality of the placed piles;
the pile feeding must adopt auxiliary machinery to cooperate with construction, and the pile driver is strictly forbidden to drag the pile to feed the pile.
c. Pile inserting positioning and straightening
After the first section of pile is lifted, the pile tip is aligned to the ground pile position marker, and pile inserting positioning is accurate. The first section of pile must be inserted at a low gear and a low speed to ensure timely deviation correction.
The two theodolites are crossed to 90 degrees and erected at a place which is about 10 meters away from the pile position. The verticality of the guide rod of the pile machine is observed firstly, after the verticality is adjusted to meet the requirements, the verticality of the pile is observed by using a theodolite, the pile machine is commanded to be adjusted repeatedly for many times, the verticality of the pile body is controlled within 1/200, particularly the verticality of the first section of pile is strictly guaranteed, and the vertical guiding effect of the pile is guaranteed.
d. Hammering pile sinking
When in piling, the clearance between the pile cap or the pile feeding cap and the periphery of the pile is controlled to be 5-10 mm, and the pile hammer pile cap, the pile feeding rod and the pile body are on the same central line. Elastic pads are arranged between the hammer and the pile cap and between the pile cap and the pile to protect the pile head through buffering.
e. Electric welding pile
And adopting solid core welding wire CO2 gas shielded semi-automatic welding.
Before welding, a polishing machine or a steel wire brush is needed to remove rust and polish the embedded iron part of the pile head, and the metallic luster is exposed.
And when the lower section of pile is sunk to be 0.5-0.8 m away from the ground, welding two reinforcing steel bar heads on the pile head of the lower section of pile, and then hanging the upper section of pile. After the upper pile and the lower pile are aligned, the verticality of the upper pile is aligned by a theodolite, and the welding can be started after the verticality meets the requirement. The pile extension should be performed after penetrating through the hard soil layer. The central deviation of the upper and lower nodes is not more than 5mm, the bending rise of the nodes is not more than 0.1% of the pile length and not more than 20mm, and the clearance between the joint surfaces is not more than 2 mm.
During welding, 6 points are symmetrically spot-welded along the circumference of the connector, and then the upper pile and the lower pile are fixed and then are subjected to layered welding, the number of welding layers is not less than two, the inner layer welding slag is cleaned, the outer layer can be welded, the welding line is full and continuous, the root part of the inner layer welding slag is completely welded, the welding line is full and continuous, and welding deformation is reduced through symmetrical welding.
4) Geological drilling rig is in place and drills
After the pile driver completes the construction of the PHC pile on the upper part of the alkaline strong cemented and iron strong cemented soil layer, a hydrogeological drilling machine with the model number of HY150 is adopted to lead holes in the pile holes, and the hole leading operation refers to the embodiment.
5) Pile driver is in place and residual pile construction is carried out
And (4) performing the same residual pile construction as the step 3) on the pile driver position.
6) Pile feeding device
a. Before pile feeding, pile feeding depth is calculated in advance, a proper pile feeder is selected, an obvious mark is marked on the pile feeder, and deviation of pile top height is strictly controlled by a level gauge.
b. The pile feeder should be matched with the pipe pile to be made into a cylinder shape and should have enough strength, rigidity and driving resistance. The measures of exhausting and draining the inner cavity of the tubular pile and the treatment of soil gushing are adopted.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A construction method of a PHC pile in a strong cementing stratum is characterized by comprising the following steps:
piling a plurality of PHC tubular piles to enable the head ends of the lower pile sections to be in contact with the upper surface of the strong cementing stratum;
arranging a drill rod and a drill bit connected with the drill rod in a pile hole of the lower pile section, and lowering the drill rod to enable the drill bit to move to the bottom of the pile hole;
driving the drill bit to drill the strong cementing stratum through a drilling machine;
drilling penetrates behind the strong cemented formation the tail end of the lower pile continues to be installed the PHC tubular pile and carries out piling construction until the head end of the lower pile sinks to a first preset depth.
2. A method of PHC pile construction in strongly cemented formations according to claim 1, characterised in that the diameter of the drill bit is smaller than the diameter of the pile hole.
3. The method for constructing the PHC pile in the strong cementing stratum according to the claim 1, wherein the drill is driven by a drilling machine to drill the strong cementing stratum, and the method specifically comprises the following steps:
the drilling machine is driven by the drilling machine to drill at low pressure in a slow rotation mode when the drill bit is used for drilling holes, and the pile holes are drilled in a backwater mode;
and the pile outlet end of the drill bit adopts a mud retaining wall to drill.
4. The method for constructing the PHC pile in the strong cementing stratum according to claim 3, wherein after the drill bit is driven by a drilling machine to drill the strong cementing stratum, the method further comprises the following steps:
after the hole forming process is finished, lifting the drill rod up and down to clean the hole;
after drilling, checking the hole forming quality and recording the hole forming;
and reducing the mud in the pile hole by a second preset depth through a mud pump for the hole which meets the quality requirement.
5. The method for constructing the PHC pile in the strong cementing stratum according to any one of claims 1 to 4, wherein the length of the PHC pipe pile which is continuously installed at the tail end of the lower pile after the drill hole penetrates through the strong cementing stratum is greater than or equal to the thickness of the strong cementing stratum, so that the lower pile penetrates through the lower surface of the strong cementing stratum after the pile is driven.
6. The method for constructing the PHC pile in the strong cementing stratum according to claim 5, wherein after the PHC pile is continuously installed at the tail end of the next pile after the drilling hole penetrates through the strong cementing stratum and pile driving construction is carried out, the method further comprises the following steps:
and any PHC tubular pile which is continuously installed is used for pumping water into the pile hole after piling construction, so that air is reserved between the top surface of the soil plug in the pile hole and the pile hammer.
7. The method for constructing the PHC pile in the strong cementing stratum according to claim 1, wherein the pile driving construction is carried out on a plurality of PHC piles, and specifically comprises the following steps:
hooking and hanging the PHC tubular pile to a pile-taking safety region of the pile machine through two ends of a crane;
hoisting the PHC tubular pile, and feeding the PHC tubular pile through the cooperation of an auxiliary machine;
after the PHC tubular pile of the first section is hoisted, pile tips are aligned with a ground pile position marker for pile inserting and positioning;
and forming a lower pile section after hammering the pile sinking, hoisting the upper pile section and aligning the lower pile section for electric welding pile splicing.
8. The method for constructing the PHC pile in the strong cementing stratum according to the claim 7, wherein the hoisting of the upper pile section and the aligning of the lower pile section are performed by electric welding pile connection, which specifically comprises the following steps:
before welding, carrying out rust removal and polishing on embedded parts of pile heads of the upper pile and the lower pile;
when the lower section of pile sinks to a height of 0.5-0.8 m from the ground, welding reinforcing steel bar heads on the pile head embedded parts of the lower section of pile;
and (4) welding after aligning the verticality of the upper section pile and the lower section pile.
9. The method for PHC pile construction in a strong cementing stratum according to claim 8, wherein the center deviation of the upper pile and the lower pile is not more than 5mm, the node bending rise is not more than 0.1% of the pile length and not more than 20mm, and the joint surface clearance is not more than 2 mm.
10. The method for constructing the PHC pile in the strong cementing stratum according to the claim 9, wherein the welding is carried out after the verticality of the upper pile and the lower pile is aligned, and the method specifically comprises the following steps:
and (3) symmetrically spot-welding along the circumference of the connector during welding, and performing layered welding after the upper section pile and the lower section pile are fixed, wherein the number of welding layers is at least two.
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| CN108755682A (en) * | 2018-05-08 | 2018-11-06 | 福建勘察基础工程公司南昌分公司 | A kind of feeler inspection formula pipe inner hole static pressure construction technology |
| CN109610342A (en) * | 2019-01-18 | 2019-04-12 | 中铁上海工程局集团有限公司 | A kind of high-speed railway bridge major diameter prefabricated tubular pile long spire drawing hole construction method |
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2020
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| KR20110014901A (en) * | 2009-08-06 | 2011-02-14 | 주식회사 세진에스씨엠 | Steel pile having drilling blade and filled with concrete and, construction methods of the same |
| CN102704481A (en) * | 2012-06-11 | 2012-10-03 | 山河智能装备股份有限公司 | Construction method combining static pressure pile sinking with middle-digging hole guiding for buildings or bridges |
| CN204608782U (en) * | 2015-02-06 | 2015-09-02 | 耿明全 | Pile-sinking device is dug in static pressure |
| CN108755682A (en) * | 2018-05-08 | 2018-11-06 | 福建勘察基础工程公司南昌分公司 | A kind of feeler inspection formula pipe inner hole static pressure construction technology |
| CN109610342A (en) * | 2019-01-18 | 2019-04-12 | 中铁上海工程局集团有限公司 | A kind of high-speed railway bridge major diameter prefabricated tubular pile long spire drawing hole construction method |
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