CN114960638A - A novel back slip casting PHC tubular pile for closely knit sandy soil - Google Patents
A novel back slip casting PHC tubular pile for closely knit sandy soil Download PDFInfo
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- CN114960638A CN114960638A CN202210483099.XA CN202210483099A CN114960638A CN 114960638 A CN114960638 A CN 114960638A CN 202210483099 A CN202210483099 A CN 202210483099A CN 114960638 A CN114960638 A CN 114960638A
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- pile
- grouting
- pipe
- phc
- steel
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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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- 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
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
Abstract
The invention discloses a novel post-grouting PHC tubular pile for compacting sandy soil, which comprises a steel pile body protective cap, a novel post-grouting PHC tubular pile body and a pile end, wherein the pile end of the post-grouting PHC tubular pile is connected with a lower port of the pile body; the invention has simple structure and simple and convenient construction, can effectively improve the bearing capacity of the pile foundation, solves the problem that the traditional PHC tubular pile is limited by geological conditions and can not be reinforced by grouting after the implementation of hard dense sandy soil, can effectively prolong the service life of the pile foundation and has extremely high social and economic benefits.
Description
Technical Field
The invention relates to the technical field of building foundation construction, in particular to a novel post-grouting PHC pipe pile for dense sandy soil.
Background
In the field of constructional engineering, a high-strength prestressed concrete pipe pile, namely a PHC pipe pile, is used as a foundation form, so that the settlement amount of an upper structure can be effectively reduced, the ultimate bearing capacity of a foundation is greatly improved, the PHC pipe pile has outstanding advantages in the aspects of pile body strength, pile forming speed, environmental protection, field management, quality stability and the like, and the application potential is large; however, the existing pile sinking process (hammering method and static pressure method) limits the development of the PHC tubular pile, when the pile is sunk in a hard stratum such as dense sandy soil, the pile is not easy to penetrate through a soil layer and the damage of the pile end is easy to cause, the PHC tubular pile is only used for a stratum with smaller pile sinking resistance, the pile end can only enter the dense sandy soil by 0.5-1m, meanwhile, the diameter of the PHC tubular pile is generally 300-600mm, and the single pile bearing capacity of the PHC tubular pile is limited due to the existing PHC tubular pile design process.
Statistical data show that the bearing capacity of a single pile of the PHC pipe pile is generally not more than 3500 kN, which causes the PHC pipe pile to be difficult to be applied to large-scale foundation constructions such as wharfs, large-span bridges, harbors and the like as a leading pile type, and the pile end is subjected to pressure grouting through a preset device by the pile foundation post-grouting technology, the mechanical property of the pile end is improved through the actions such as cement slurry filling and compacting, and the bearing capacity of the pile foundation is improved; the existing pile foundation post-grouting technology is widely applied to cast-in-situ bored pile construction, but the existing post-grouting technology in the PHC tubular pile is still less applied under the influence of the construction process.
In the construction of the PHC tubular pile, because the PHC tubular pile adopts a pile sinking process (a hammering method and a static pressure method), a pile end grouting device is generally damaged or blocked in the pile sinking process, and when the PHC tubular pile faces dense sandy soil, for example, the pile end of the PHC tubular pile and a pile end grouting device are more seriously damaged, so that a post grouting technology cannot be effectively applied to the PHC tubular pile, and the aims of reinforcing a soil layer at the pile end and improving the bearing capacity of the PHC tubular pile are fulfilled; how to solve the problems is the key for effectively improving the bearing capacity of the PHC tubular pile foundation, and no effective measure for solving the problems exists at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a novel post-grouting PHC tubular pile for dense sandy soil, solves the problem that the traditional PHC tubular pile is limited by geological conditions and cannot be subjected to post-grouting reinforcement on hard dense sandy soil, can effectively prolong the service life of a pile foundation and has extremely high social and economic benefits.
The invention is realized by the following technical scheme:
a novel post-grouting PHC tubular pile for compacting sandy soil comprises a steel pile body protective cap, a novel post-grouting PHC tubular pile body and a pile end; the steel pile body protective cap, the novel post-grouting PHC pipe pile body and the pile end are sequentially connected by flanges;
the novel post-grouting PHC pipe pile comprises a novel post-grouting PHC pipe pile body, a pile side grouting device, a pile end grouting device, a steel cone, a pile side vertical grouting pipe, a pile end vertical grouting pipe and a steel pile body protective cap;
the novel post-grouting PHC pipe pile body is internally and pre-provided with a plurality of pile side vertical grouting pipes, pile end vertical grouting pipes and pile side grouting devices; the pile side vertical grouting pipe and the pile end vertical grouting pipe are communicated with the whole novel post-grouting PHC tubular pile body; a steel pile body protective cap is arranged at the top end of the novel post-grouting PHC tubular pile body; the novel post-grouting PHC pipe pile body is connected with the pile end grouting device in a flange joint welding mode; the pile end grouting device is connected with the steel cone in a flange joint welding mode.
2. The pile side grouting device is directly connected with the pile side vertical grouting pipe; the pile side vertical grouting pipe and the pile side grouting device need to be prefabricated in a pile body in advance; pile side grouting devices are preset every 10m on the pile body from the pile end to the pile top; the pile side grouting device is composed of a pile side vertical grouting pipe, a pile side grouting device and a four-way joint.
3. The pile end grouting device is directly connected with the pile end vertical grouting pipe; the pile end grouting device consists of a steel limiting protection box and a pile end grouting device; the pile end grouting device is connected with the steel cone in a flange joint welding mode.
4. The pile end grouting device of the pile end grouting device consists of a pile end vertical grouting pipe and a grouting device grout outlet; wherein the pile end grouting device is arranged in the steel limiting protection box; the grout outlet of the grouting device needs to extend out of the steel limiting protection box but cannot extend out of the outer side of the pile body, so that the grout outlet of the grouting device is prevented from being damaged due to the fact that the grout outlet of the grouting device cannot be protected by the steel limiting protection box in the piling process.
Compared with the prior art, the invention has the following advantages: the invention has the following beneficial effects: on one hand, the grouting pipe and the pile side grouting device are prefabricated in the post-grouting PHC tubular pile, so that the post-grouting process can be conveniently and quickly used on the basis of not changing the existing construction process, the original defects are improved, the single-pile bearing capacity of the PHC tubular pile is improved, and the application range of the PHC tubular pile is enlarged; on the other hand, the pile-end grouting device is arranged in the steel limiting protection box, and the steel cone is connected below the pile-end grouting device, so that the pile-end grouting device can be effectively prevented from being damaged in the process of sinking the PHC pile in the dense sandy soil, and the quality of the post-grouting process is ensured; the method is optimized aiming at the difficult engineering application problem of the traditional PHC tubular pile in the aspect of post-grouting technology, is convenient to operate, is economical and practical, and is convenient to popularize and apply in a construction site.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a top plan view of the pile top of the present invention;
FIG. 3 is a block diagram of the pile side grouting device of the present invention pre-installed inside the pile body;
FIG. 4 is a schematic view of the pile end grouting arrangement of the present invention;
FIG. 5 is a block diagram of the pile end grouting arrangement of the present invention;
FIG. 6 is a cross-sectional view of the pile side grouting device of the present invention pre-installed inside the pile shaft;
fig. 7 is a cross-sectional view of the pile end grouting device of the invention.
The figure shows that: 1-novel post-grouting PHC tubular pile body, 2-pile side grouting device, 3-pile end grouting device, 4-steel cone, 11-pile side vertical grouting pipe, 12-pile end vertical grouting pipe, 13-steel pile body protective cap, 21-pile side grouting device, 22-four-way joint, 31-grouting device outlet, 33-pile end grouting device and 34-steel limiting protective box.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Firstly, referring to fig. 1, 3 and 4, in the present embodiment, the steel pile body protective cap, the novel post-grouting PHC pile body and the pile end are included, referring to fig. 1 and 2, according to the design and actual arrangement of the pile side vertical grouting pipe 11 and the pile end vertical grouting pipe 12, a corresponding number of grouting holes are reserved in the corresponding position of the steel pile body protective cap 13.
Subsequently, referring to fig. 1, 3 and 6, the novel post-grouting PHC tubular pile body is manufactured by adopting a pre-tensioning prestressing process and a centrifugal forming method, a pile-side vertical grouting pipe 11, a pile-end vertical grouting pipe 12 and a pile-side grouting device 21 are pre-installed in the pile body, and the pile-end grouting device is connected with the PHC tubular pile body after being assembled and then constructed.
Referring to fig. 1-7, the present embodiment includes a post-grouting PHC tubular pile body 1, a pile-side grouting device 2, a pile-end grouting device 3, a steel cone 4, a pile-side vertical grouting pipe 11, a pile-end vertical grouting pipe 12, and a steel pile body protective cap 13;
a plurality of pile side vertical grouting pipes 11, a pile end vertical grouting pipe 12 and a pile side grouting device 2 are pre-installed in the novel post-grouting PHC tubular pile body; the pile side vertical grouting pipe 11 and the pile end vertical grouting pipe 12 are communicated with the whole novel post-grouting PHC tubular pile body 1; a steel pile body protective cap 13 is arranged at the top end of the novel post-grouting PHC tubular pile body 1; the novel post-grouting PHC tubular pile body 1 is connected with the pile end grouting device 3 in a flange joint welding mode; the pile end grouting device 3 is connected with the steel cone 4 in a flange joint welding mode.
Referring to fig. 3, a pile-side vertical grouting pipe 11, a pile-side grouting device 21 and a four-way joint 22 form a pile-side grouting device 2. Pile side grouting devices 2 are preset in the pile body every 10m from the pile end to the pile top, and the pile side vertical grouting pipes 11 are directly connected with the pile side grouting devices 2.
Next, referring to fig. 1, 4, 5 and 7, the steel limit protection box 34 and the pile end grouting device 33 are combined into the pile end grouting device 3 of the present invention, the pile end grouting device 3 is directly connected to the pile end vertical grouting pipe 12, and the pile end grouting device 3 is connected to the steel cone 4 by flange joint welding.
Referring to fig. 4, 5 and 7, the pile end grouting device 33 of the pile end grouting device 3 is composed of a pile end vertical grouting pipe 12 and a grouting device grout outlet 31; wherein the pile end grouting device 33 is arranged in a steel limit protection box 34; the grout outlet 31 of the grouting device needs to extend out of the steel limiting protection box 34 but not beyond the outer side of the pile body, so that the condition that the grout outlet 31 of the grouting device cannot be protected by the steel limiting protection box 34 and is damaged in the piling process is avoided, smooth construction of the post-grouting PHC pile in dense sandy soil can be ensured, the pile end grouting device 3 of the post-grouting PHC pile is prevented from being damaged by the dense sandy soil in the piling process, and the condition that the outlet of the pile end grouting device 3 can smoothly press out grout is ensured.
Finally, referring to fig. 1 and 2, in the construction process, the steel pile body protective cap, the novel post-grouting PHC pile body and the pile end of the invention are sequentially connected by flanges. And carrying out piling operation and post-grouting operation on the post-grouting PHC tubular pile according to the corresponding places and the national pile foundation construction standard.
The invention has simple structure and simple and convenient construction, can effectively improve the bearing capacity of the pile foundation, solves the problem that the traditional PHC tubular pile is limited by geological conditions and can not be reinforced by grouting after the implementation of hard dense sandy soil, can effectively prolong the service life of the pile foundation and has extremely high social and economic benefits.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A novel post-grouting PHC tubular pile for compacting sandy soil is characterized by comprising a steel pile body protective cap, a novel post-grouting PHC tubular pile body and a pile end; the steel pile body protective cap, the novel post-grouting PHC pipe pile body and the pile end are sequentially connected by flanges;
the novel post-grouting PHC pipe pile comprises a novel post-grouting PHC pipe pile body (1), a pile side grouting device (2), a pile end grouting device (3), a steel cone (4), a pile side vertical grouting pipe (11), a pile end vertical grouting pipe (12) and a steel pile body protective cap (13);
wherein, a plurality of pile side vertical grouting pipes (11), a plurality of pile end vertical grouting pipes (12) and a plurality of pile side grouting devices (2) are pre-installed in the novel post-grouting PHC tubular pile body (1); the pile side vertical grouting pipe (11) and the pile end vertical grouting pipe (12) are communicated with the whole novel post-grouting PHC tubular pile body (1); a steel pile body protective cap (13) is arranged at the top end of the novel post-grouting PHC pipe pile body (1); the novel post-grouting PHC tubular pile body (1) is connected with the pile end grouting device (3) in a flange joint welding mode; the pile end grouting device (3) is connected with the steel cone (4) in a flange joint welding mode.
2. The novel post-grouting PHC pipe pile for dense sandy soil as claimed in claim 1, wherein: the pile side grouting device (2) is directly connected with the pile side vertical grouting pipe (11); the pile side vertical grouting pipe (11) and the pile side grouting device (2) need to be prefabricated in the pile body (1) in advance; pile side grouting devices (2) are preset every 10m in the direction from the pile end to the pile top of the pile body (1); the pile side grouting device (2) is composed of a pile side vertical grouting pipe (11), a pile side grouting device (21) and a four-way joint (22).
3. The novel post-grouting PHC pipe pile for dense sandy soil according to claim 1, characterized in that: the pile end grouting device (3) is directly connected with the pile end vertical grouting pipe (12); the pile end grouting device (3) consists of a steel limiting protection box (34) and a pile end grouting device (33); the pile end grouting device (3) is connected with the steel cone (4) in a flange joint welding mode.
4. The novel post-grouting PHC pipe pile for dense sandy soil as claimed in claim 1, wherein:
the pile end grouting device (33) of the pile end grouting device (3) consists of a pile end vertical grouting pipe (12) and a grouting device grout outlet (31); wherein the pile end grouting device (33) is arranged in the steel limit protection box (34); the grout outlet (31) of the grouting device needs to extend out of the steel limiting protection box (34) and not to extend out of the outer side of the pile body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210483099.XA CN114960638A (en) | 2022-05-06 | 2022-05-06 | A novel back slip casting PHC tubular pile for closely knit sandy soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210483099.XA CN114960638A (en) | 2022-05-06 | 2022-05-06 | A novel back slip casting PHC tubular pile for closely knit sandy soil |
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| Publication Number | Publication Date |
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| CN114960638A true CN114960638A (en) | 2022-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210483099.XA Pending CN114960638A (en) | 2022-05-06 | 2022-05-06 | A novel back slip casting PHC tubular pile for closely knit sandy soil |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201106173Y (en) * | 2007-10-17 | 2008-08-27 | 山东万鑫建设有限公司 | Pile terminal pressure slip-casting machine for prestressed concrete pipe pile |
| CN203411979U (en) * | 2013-08-20 | 2014-01-29 | 河北建设勘察研究院有限公司 | Post-grouting device for pile side of cast-in-situ bored pile |
| CN111945713A (en) * | 2020-07-24 | 2020-11-17 | 中交第三航务工程局有限公司 | Construction method for grouting after rock-socketed inclined pile of offshore wind power foundation steel pipe pile |
| CN113863294A (en) * | 2021-09-13 | 2021-12-31 | 湖南省交通规划勘察设计院有限公司 | PHC (prestressed high-strength concrete) tubular pile internally provided with pile end grouting device and construction process thereof |
-
2022
- 2022-05-06 CN CN202210483099.XA patent/CN114960638A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201106173Y (en) * | 2007-10-17 | 2008-08-27 | 山东万鑫建设有限公司 | Pile terminal pressure slip-casting machine for prestressed concrete pipe pile |
| CN203411979U (en) * | 2013-08-20 | 2014-01-29 | 河北建设勘察研究院有限公司 | Post-grouting device for pile side of cast-in-situ bored pile |
| CN111945713A (en) * | 2020-07-24 | 2020-11-17 | 中交第三航务工程局有限公司 | Construction method for grouting after rock-socketed inclined pile of offshore wind power foundation steel pipe pile |
| CN113863294A (en) * | 2021-09-13 | 2021-12-31 | 湖南省交通规划勘察设计院有限公司 | PHC (prestressed high-strength concrete) tubular pile internally provided with pile end grouting device and construction process thereof |
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