CN109868813B - Bottom sealing method of prestressed pipe pile - Google Patents
Bottom sealing method of prestressed pipe pile Download PDFInfo
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- CN109868813B CN109868813B CN201711263117.9A CN201711263117A CN109868813B CN 109868813 B CN109868813 B CN 109868813B CN 201711263117 A CN201711263117 A CN 201711263117A CN 109868813 B CN109868813 B CN 109868813B
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Abstract
The invention relates to the field of precast piles for foundations, in particular to a bottom sealing method for a prestressed pipe pile. A bottom sealing method of a prestressed pipe pile is characterized by comprising the following steps: the method is implemented in sequence according to the following steps: a. preparing; b. opening a hole; c. plugging; d. connecting; e. perfusion; f. and (5) maintaining. The invention has convenient operation, strong adaptability and good economic benefit.
Description
Technical Field
The invention relates to the field of prefabricated pipe piles for foundations, in particular to a bottom sealing method for a prestressed pipe pile.
Background
Adopt the stress tube stake in advance as engineering pile under the easy softened geological conditions of meeting water, general design all can require to carry out the treatment of pile core back cover in order to prevent groundwater, surface water from soaking a pile end holding layer through the pile core hole to cause the holding layer to become soft and reduce the bearing capacity. When the construction of the prestressed pipe pile is carried out by adopting a static pile pressing mode, the bottom sealing concrete pouring is generally carried out when the first section of pile is pressed to the position where the distance between the top pile and the ground is 0.5 m-1 m, then the pile splicing or pile feeding is carried out, because the length of the first section of pile is basically 8 m-15 m, the bottom sealing concrete pouring of the pile core hole is easy to produce segregation and incompact, and the purpose of bottom sealing cannot be achieved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a precast pile treatment method which is convenient to operate, strong in adaptability and good in economic benefit, and discloses a bottom sealing method of a prestressed pipe pile.
The invention achieves the purpose through the following technical scheme:
a bottom sealing method of a prestressed pipe pile is characterized by comprising the following steps: the method is implemented in sequence according to the following steps:
a. preparing: the method comprises the following steps of (1) familiarizing with a drawing before the construction of the prestressed pipe pile, carrying out reasonable pile allocation, feeding the pile into the field in batches about one week in advance, and feeding the subsequent pile into the field in batches according to the construction progress; because the bottom sealing concrete is only needed at the first section of each pile, the using amount of each batch of the first section of pile material entering the field needs to be ensured for about one week, the pile material comprises a pile body and a pile tip, and the pile body and the pile tip are matched and enter the field simultaneously; according to the pile matching requirement in each batch of pile materials, the first section of pile materials are flatly paved in a centralized manner so as to be convenient for implementing ground concrete bottom sealing;
the pile body is tubular, the inner cavity of the pile body is a pile core, an end plate is fixed on one end surface of the pile body, the central axes of the pile body, the pile core and the end plate are superposed with each other, the pile tip comprises a tip body and a bottom plate, the tip body is cross-shaped and is fixed on the bottom plate, and the central axes of the tip body and the bottom plate are superposed with each other;
b. opening holes: respectively forming a grouting hole with phi 32mm and a grout returning hole with phi 25mm on the bottom plate, wherein the distance between the central points of the grouting hole and the grout returning hole is-50 mm of the aperture of the pile core, the connecting line of the central points of the grouting hole and the grout returning hole passes through the central point of the bottom plate and is symmetrically arranged by taking one diameter of the bottom plate as a symmetry axis, and two holes are correspondingly formed in the positions, corresponding to the grouting hole and the grout returning hole, on the end plate; a grouting pipe is sleeved in the grouting hole, an exhaust pipe is connected to the grout return hole, a pile tip is covered at one end of the pile body by a bottom plate, and the inner end of the grouting pipe is arranged in the pile core;
c. plugging: sequentially arranging a wood plate and a sand bag in the pile core from near to far away from the end plate to plug the pile core, wherein the distance between the wood plate and the end plate is the length of a designed required bottom sealing, and the distance between the wood plate and the inner end of the grouting pipe is 500 mm;
d. connecting: welding a bottom plate of the pile tip on an end plate of the pile body, and fully welding and sealing a welding line and enabling the grouting hole to be positioned right below the grout returning hole during welding;
e. pouring: pouring bottom-sealing micro-expansive concrete into the pile core through the grouting holes, observing the grout return holes during pouring, and finishing grouting only by discharging cement slurry after no air is discharged from the grout return holes; the method is characterized in that the bottom sealing concrete is supplied by a special mixing plant according to the design requirements, if the design requirements do not exist, C35 micro-expanded fine stone concrete is generally adopted, coarse aggregate particles of the bottom sealing concrete are mixed according to the lower limit amount, gravel is adopted as far as possible, the particle size cannot be overlarge, and the amount of the bottom sealing concrete required by each pile material is calculated in advance according to the specification of the pile material and the design requirements of the bottom sealing before the bottom sealing micro-expanded concrete is poured so as to observe whether abnormal conditions occur during pouring;
f. and (5) maintenance: after pouring, the grouting pipe and the exhaust pipe are immediately detached, the grouting hole and the grout returning hole are plugged by cast iron plugs, if the pile is operated in high-temperature weather, the surface of the pile material of the plugging section needs to be covered and cooled, pile pressing operation can be carried out after bottom-sealing slightly-expanded concrete reaches 70% of the designed strength of the concrete, and the waiting time is determined according to weather conditions and is generally about one week.
The bottom sealing method of the prestressed pipe pile is characterized by comprising the following steps: in the step b, the grouting holes and the grouting pipes and the slurry return holes and the exhaust pipes are connected by threads;
c, in order to prevent the sand bag from leaking and being blocked due to the grouting pressure, the sand bag is tied on the bottom plate by an iron wire;
and e, when the step e is carried out, the slump of the bottom sealing micro-expansion concrete is not less than 220 mm.
According to the invention, the bottom sealing concrete is poured on the ground in advance before pile pressing, and pile pressing operation is carried out after consolidation, so that the plumpness and the compactness of the bottom sealing concrete are ensured, the bearing capacity of a pile foundation is ensured, and the problem that the quality of the concrete bottom sealing of the prestressed pipe pile cannot be ensured is solved;
the invention has the following beneficial effects:
1. the application is wide: the prestressed pipe pile is a common pile foundation, and most of the existing prestressed pipe piles are designed to prevent underground water and surface water from soaking a pile end bearing layer and require bottom sealing, and can be implemented by adopting the method disclosed by the invention;
2. the economic benefit is good: if the bearing capacity of the pile foundation cannot meet the requirement due to the fact that underground water or surface water soaks the pile end bearing layer through the pile core hole, re-pressing or pile repairing treatment is needed, not only a large amount of capital is spent, but also great influence is caused on the construction period, and manpower and materials spent can be greatly reduced;
3. the operability is strong: the materials such as machinery, equipment, materials, personnel and the like required by the invention are all existing in the construction site or are easy to rent and purchase, and the construction cost is not additionally increased.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
fig. 2 is a view from direction a in fig. 1.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
A bottom sealing method of a prestressed pipe pile is implemented according to the following steps in sequence:
a. preparing: the method comprises the following steps of (1) familiarizing with a drawing before the construction of the prestressed pipe pile, carrying out reasonable pile allocation, feeding the prestressed pipe pile into a field in batches about one week in advance, and feeding the following pile materials into the field in batches according to the construction progress; because the bottom sealing concrete is only needed at the first section of each pile, the using amount of each batch of the first section of pile material entering the field needs to be ensured for about one week, the pile material comprises a pile body 1 and a pile tip 2, and the pile body 1 and the pile tip 2 are matched and enter the field simultaneously; according to the pile matching requirement in each batch of pile materials, the first section of pile materials are flatly paved in a centralized manner so as to be convenient for implementing ground concrete bottom sealing;
the pile body 1 is tubular, the cavity of the pile body 1 is a pile core 11, an end plate 12 is fixed on one end surface of the pile body 1, the central axes of the pile body 1, the pile core 11 and the end plate 12 are superposed with each other, the pile tip 2 comprises a tip body 21 and a bottom plate 22, the tip body 21 is cross-shaped, the tip body 21 is fixed on the bottom plate 22, and the central axes of the tip body 21 and the bottom plate 22 are superposed with each other;
b. opening holes: a grouting hole 31 with phi 32mm and a grout return hole 32 with phi 25mm are respectively formed in the bottom plate 22, the distance between the central points of the grouting hole 31 and the grout return hole 32 is-50 mm of the aperture of the pile core 11 as shown by s in fig. 2, the connecting line of the central points of the grouting hole 31 and the grout return hole 32 passes through the central point of the bottom plate 22 and is symmetrically arranged by taking one diameter of the bottom plate 22 as a symmetry axis, and two holes are correspondingly formed in the positions, corresponding to the grouting hole 31 and the grout return hole 32, on the end plate 12; a grouting pipe 33 is sleeved in the grouting hole 31, an exhaust pipe 34 is connected to the grout return hole 32, in order to facilitate assembly and disassembly, threaded connection is adopted between the grouting hole 31 and the grouting pipe 33 and between the grout return hole 32 and the exhaust pipe 34, the pile tip 2 is covered at one end of the pile body 1 by using the bottom plate 22, and the inner end of the grouting pipe 33 is arranged in the pile core 11;
c. plugging: arranging a wood board 41 and a sand bag 42 in the pile core 11 from near to far away from the end plate 12 to plug the pile core 11, wherein the distance between the wood board 41 and the end plate 12 is the length of a back cover required by design as shown by x in figure 1, and the distance between the wood board 41 and the inner end of the grouting pipe 33 is 500mm as shown by y in figure 2; in order to prevent the sand bag from being blocked due to the top run of the grouting pressure, the sand bag 42 is fastened on the bottom plate 22 by an iron wire;
d. connecting: as shown in fig. 1 and 2: welding the bottom plate 22 of the pile tip 2 on the end plate 12 of the pile body 1, wherein during welding, the welding seam 23 is fully welded and sealed, and the grouting hole 31 is positioned right below the grout returning hole 32;
e. pouring: pouring bottom-sealing micro-expansion concrete into the pile core 11 through the grouting holes 31, observing the grout return holes 32 during pouring, and finishing grouting only by discharging cement slurry when no air is discharged out of the grout return holes 32; the requirement of the bottom-sealing micro-expansion concrete is supplied by a special mixing plant according to the design requirement, if the design requirement does not exist, C35 micro-expansion fine-stone concrete is generally adopted, in order to be poured smoothly, the slump of the bottom-sealing micro-expansion concrete is not less than 220mm, the coarse aggregate of the bottom-sealing micro-expansion concrete is mixed according to the lower limit, gravel is adopted as far as possible, the particle size cannot be overlarge, the amount of the bottom-sealing micro-expansion concrete required by each pile material is calculated in advance according to the specification of the pile material and the design requirement of the bottom sealing before the bottom-sealing micro-expansion concrete is poured so as to observe whether abnormal conditions occur during pouring,
f. and (5) maintenance: after pouring, the grouting pipe 33 and the exhaust pipe 34 are immediately detached, the grouting hole 31 and the grout returning hole 32 are plugged by cast iron plugs, if in high-temperature weather operation, the surface of the pile material of the plugging section needs to be covered and cooled, pile pressing operation can be carried out after bottom-sealing slightly-expanded concrete reaches 70% of the designed strength of the concrete, and the waiting time is determined according to weather conditions and is generally about one week.
Claims (2)
1. A bottom sealing method of a prestressed pipe pile is characterized by comprising the following steps: the method is implemented in sequence according to the following steps:
preparing: the pile body (1) is tubular, the inner cavity of the pile body (1) is a pile core (11), an end plate (12) is fixed on one end face of the pile body (1), the central axes of the pile body (1), the pile core (11) and the end plate (12) are mutually overlapped, the pile tip (2) comprises a tip body (21) and a bottom plate (22), the tip body (21) is cross-shaped, the tip body (21) is fixed on the bottom plate (22), and the central axes of the tip body (21) and the bottom plate (22) are mutually overlapped;
drilling holes: a grouting hole (31) with the diameter of 32mm and a grout return hole (32) with the diameter of 25mm are respectively formed in the bottom plate (22), the distance between the central points of the grouting hole (31) and the grout return hole (32) is-50 mm of the aperture of the pile core (11), the connecting line of the central points of the grouting hole (31) and the grout return hole (32) passes through the central point of the bottom plate (22) and is symmetrically arranged by taking the diameter of the bottom plate (22) as a symmetry axis, and two holes are correspondingly formed in the positions, corresponding to the grouting hole (31) and the grout return hole (32), on the end plate (12); a grouting pipe (33) is sleeved in the grouting hole (31), an exhaust pipe (34) is connected to the grout return hole (32), the pile tip (2) is covered at one end of the pile body (1) by a bottom plate (22), and the inner end of the grouting pipe (33) is arranged in the pile core (11);
thirdly, plugging: sequentially arranging a wood board (41) and a sand bag (42) from near to far away from an end plate (12) in the pile core (11) to block the pile core (11), wherein the distance between the wood board (41) and the end plate (12) is the length of a back cover required by design, and the distance between the wood board (41) and the inner end of a grouting pipe (33) is 500 mm;
fourthly, connection: welding a bottom plate (22) of the pile tip (2) on an end plate (12) of the pile body (1), wherein during welding, a welding seam (23) is fully welded and sealed, and a grouting hole (31) is positioned right below a grout returning hole (32);
filling: pouring bottom-sealing micro-expansion concrete into the pile core (11) through the grouting holes (31), observing the grout return holes (32) during pouring, and finishing grouting when no air is discharged out of the grout return holes (32) and only cement slurry is discharged;
sixthly, maintenance: and after the pouring is finished, immediately detaching the grouting pipe (33) and the exhaust pipe (34), plugging the grouting hole (31) and the grout return hole (32) by using a cast iron plug, and performing pile pressing operation when the bottom-sealed micro-expansion concrete reaches 70% of the designed strength of the concrete.
2. The method for sealing the bottom of the prestressed pipe pile according to claim 1, wherein: in the second step, the grouting hole (31) and the grouting pipe (33) and the grout returning hole (32) and the exhaust pipe (34) are connected by threads;
when in step three, the sand bag (42) is tied on the bottom plate (22) by an iron wire;
in the fifth step, the slump of the bottom-sealing slightly-expanded concrete is not less than 220 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711263117.9A CN109868813B (en) | 2017-12-04 | 2017-12-04 | Bottom sealing method of prestressed pipe pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711263117.9A CN109868813B (en) | 2017-12-04 | 2017-12-04 | Bottom sealing method of prestressed pipe pile |
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| CN109868813A CN109868813A (en) | 2019-06-11 |
| CN109868813B true CN109868813B (en) | 2022-07-22 |
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| CN113026731A (en) * | 2021-02-25 | 2021-06-25 | 中建八局第四建设有限公司 | Tubular pile bottom sealing pouring construction method |
| CN113684822B (en) * | 2021-08-13 | 2023-03-10 | 中交第三航务工程局有限公司江苏分公司 | Construction method of offshore implantable rock-socketed pile |
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| CN102140795B (en) * | 2010-02-01 | 2016-02-03 | 江苏固丰管桩集团有限公司 | A kind of prestressed concrete pipe pile steel pile tip |
| CN102605767A (en) * | 2012-03-27 | 2012-07-25 | 浙江大学城市学院 | Precast pile reserved with grouting pipe and piling process of precast pile |
| KR20140014739A (en) * | 2012-07-25 | 2014-02-06 | 유지훈 | Pile with non-closed channel shape of plural non-flat in the end of pile and method of construction of pile by using the same |
| CN102828509B (en) * | 2012-09-26 | 2014-11-05 | 长沙学院 | Joint grouting method from bottom and side of prestressed pipe pile |
| CN104294822B (en) * | 2014-10-13 | 2016-01-06 | 安徽天筑建设（集团）有限公司 | Reinforcing thick-covering and deep-burying soft soil rigid-flexible mechanical arm construction method |
| CN204645027U (en) * | 2015-04-10 | 2015-09-16 | 沙焕焕 | Prose style free from parallelism grouting behind shaft or drift lining strength core composite pile |
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