CN110144885B - Three-section type major diameter bored pile structure - Google Patents
Three-section type major diameter bored pile structure Download PDFInfo
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- CN110144885B CN110144885B CN201910280978.0A CN201910280978A CN110144885B CN 110144885 B CN110144885 B CN 110144885B CN 201910280978 A CN201910280978 A CN 201910280978A CN 110144885 B CN110144885 B CN 110144885B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
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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
- E02D5/48—Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- Piles And Underground Anchors (AREA)
Abstract
The invention provides a three-section large-diameter cast-in-situ bored pile structure which is suitable for foundation construction of an ultra-large sea-crossing bridge and comprises a concrete pile body, inner and outer main reinforcements, stirrups, a perforated H-shaped steel cylindrical support, a triangular cylindrical angle steel support and a sounding pipe. The upper and lower sections of the pile structure adopt a double-layer main rib structure, the middle section adopts a single-layer main rib structure, the inner main ribs of the three-section structure are connected up and down to form an integral reinforcement cage, the integral reinforcement cage is placed into a vertical deep hole formed by a drilling method, and concrete is poured integrally to form an integral pile foundation structure. The full-length sounding pipe is arranged in the pile body and used for detecting the pile forming quality of the drilled pile after construction is finished. On the basis of meeting the design requirement, the invention can obviously improve the efficiency of construction and installation of the pile foundation reinforcement cage, ensure the safety of pile foundation construction in a complex sea area environment and provide ideal structural reliability.
Description
Technical Field
The invention belongs to the technical field of construction of a bridge engineering pile foundation, and particularly relates to a three-section type large-diameter bored pile structure.
Background
With the rapid development of economic society in China, ocean-oriented engineering construction becomes an important development strategy of the country, a plurality of cross-sea bridges, such as Hangzhou gulf cross-sea bridges, Gankaoao bridges and the like, are built in various places along the coast in China, and related departments are planning and building a plurality of ultra-large cross-sea bridges, such as Johnson strait bridges, Taiwan strait bridges and the like. The construction conditions of the ultra-large type sea-crossing bridge are very special, and the ultra-large type sea-crossing bridge has the characteristics of large scale, poor operation conditions, short construction operation time, discontinuous construction procedures, large construction operation difficulty and the like, particularly under the complex seawater hydrological condition, the construction difficulty of the bridge pile foundation is more prominent, the sea-crossing bridge foundation is influenced by risks such as sea wave load, ship impact load and the like, the rigidity requirement of the pile body is very high, the small-diameter bored pile is difficult to meet the safety requirement, and the large-diameter bored pile is a main pile foundation scheme adopted by the engineering boundary at home and abroad. In order to ensure the construction quality and the construction period of the ultra-large sea-crossing bridge, a novel large-diameter cast-in-place bored pile structural form is urgently needed to be provided aiming at the defects of the current sea-crossing bridge foundation construction technology so as to meet the requirements of actual engineering and overcome the most prominent key and difficult points in the construction of the ultra-large sea-crossing bridge.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a three-section large-diameter cast-in-place bored pile structure aiming at the urgent requirements of the design and construction of an ultra-large sea-crossing bridge pile foundation.
In order to achieve the above object, the present invention provides the following technical solutions:
the whole cast-in-situ bored pile is vertically built below the ground, is in a cylinder with a certain length, is divided into three sections from top to bottom, namely an upper section, a middle section and a lower section, and adopts different reinforcement cage structural forms;
the upper section structure of the large-diameter cast-in-situ bored pile consists of a concrete pile body 1, an inner side main reinforcement 2, an upper section outer side main reinforcement 3, an outer side stirrup 5, a perforated H-shaped steel cylindrical support 7 and an acoustic pipe 9; the inner main reinforcement 2 and the upper section outer main reinforcement 3 are reinforcing steel bars with the same specification; a certain number of inner main reinforcements 2 are vertically arranged in a group of two, and are uniformly distributed at the outer positions inside the circular pile body in a circumferential mode; every two upper-section outer main ribs 3 are vertically arranged in a group in an abutting mode, are circumferentially and uniformly distributed on the outer side of the inner main rib 2, and the number of the upper-section outer main ribs 3 is 2/3 of the inner main rib 2; the outer stirrups 5 are circular-ring-shaped steel bars, the diameter of the steel bars is smaller, the inner diameter of the circular ring of the outer stirrups 5 is equal to the outer diameter of the circumference formed by the arrangement of the upper-section outer main reinforcements 3, a certain number of the outer stirrups 5 are uniformly arranged up and down, the upper-section outer main reinforcements 3 are hooped, and are bound and fixed by thin steel wires; the H-shaped steel cylindrical support 7 with holes is a circular ring-shaped member made of H-shaped steel, round holes are uniformly distributed on a steel web, a certain number of H-shaped steel cylindrical supports 7 with holes are vertically and uniformly distributed between the outer main rib 3 and the inner main rib 2 of the upper section, the inner part and the outer part are tightly leaned against each other, and the H-shaped steel cylindrical supports are bound and fixed through thin steel wires;
the middle section structure of the large-diameter cast-in-situ bored pile consists of a concrete pile body 1, an inner side main reinforcement 2, a middle section stirrup 6, a triangular cylindrical angle steel bracket 8 and an acoustic measurement pipe 9; the vertical distribution mode of the inner main reinforcement 2 is completely the same as that of the upper section structure; the middle-section stirrups 6 are circular-ring-shaped steel bars, the diameter of the steel bars is smaller, the inner diameter of a circular ring of the middle-section stirrups 6 is equal to the outer diameter of a circle formed by arranging the inner-side main reinforcements 2, a certain number of the middle-section stirrups 6 are uniformly arranged up and down, the inner-side main reinforcements 2 are hooped and bound and fixed by thin steel wires; the triangular cylindrical angle steel bracket 8 is a circular component made of angle steel, three steel bars are welded on the inner side of an angle steel circle in an equilateral triangle mode to improve the overall rigidity of the triangular cylindrical angle steel bracket 8, and a certain number of the triangular cylindrical angle steel brackets 8 are vertically and uniformly distributed on the inner side of the inner main rib 2 and are bound and fixed through thin steel wires;
the lower section structure of the large-diameter cast-in-situ bored pile consists of a concrete pile body 1, an inner side main reinforcement 2, a lower section outer side main reinforcement 4, an outer side stirrup 5, a perforated H-shaped steel cylindrical support 7 and an acoustic pipe 9; the inner main reinforcement 2 and the lower section outer main reinforcement 4 are reinforcing steel bars with the same specification and the same number; the vertical distribution mode of the inner main reinforcement 2 is completely the same as the structures of the upper section and the middle section; every two outer main ribs 4 on the lower section are vertically and closely arranged in a group, and are uniformly distributed on the outer side of the inner main rib 2 in a circumferential mode; a certain number of outer stirrups 5 are uniformly arranged up and down, and the lower section of outer main reinforcement 4 is hooped and bound and fixed by thin steel wires; a certain number of H-shaped steel cylinder supports 7 with holes are vertically and uniformly distributed between the outer main ribs 4 and the inner main ribs 2 of the lower section, closely attached to each other and fixed through thin steel wires;
the distribution forms of the inner main reinforcements 2 in the upper section, the middle section and the lower section of the large-diameter cast-in-situ bored pile are completely the same, and the upper section, the lower section and the upper section are vertically connected and are connected by adopting steel bar joints in a one-to-one correspondence manner;
in the construction process, after the reinforcement cages of the three-section structure are connected, the reinforcement cages are placed in a vertical deep hole formed by a drilling method, concrete is integrally poured to form a concrete pile body 1, and then an integral structure is formed;
the length and the diameter of the whole large-diameter cast-in-situ bored pile depend on actual engineering requirements, and the length distribution of the upper section, the middle section and the lower section structure depends on the structural design requirements of the upper structure;
a plurality of sound measuring tubes 9 with full length are arranged inside the pile body, the sound measuring tubes 9 are vertically distributed and are close to the inner side of the inner main rib 2, and the sound measuring tubes are used for detecting the integrity of the pile body by adopting a sound wave measuring method in the pile foundation construction process and after completion.
The construction process of the invention is as follows:
the first step is as follows: and (5) binding a reinforcement cage. And (3) respectively binding reinforcement cages of the upper section, the middle section and the lower section of the cast-in-situ bored pile according to design requirements, firmly connecting the inner main reinforcements 2 of the upper section, the middle section and the lower section by adopting reinforcement joints, and binding the full-length sounding pipe 9.
The second step is that: and (5) forming holes on the pile foundation. And according to design requirements, combining the hydrological environment conditions of a construction site, and completing pile foundation pore-forming by adopting a drilling method.
The third step: and placing a reinforcement cage. The entire length of the reinforcement cage is placed into the drilled hole.
The fourth step: and (5) pouring concrete. And (3) pouring sufficient concrete into the hole, and detecting the quality of the pile body by using the sound measuring tube during the pouring process and after the pouring is finished.
Compared with the prior art, the invention has the beneficial effects that: can show the efficiency that improves steel reinforcement cage construction installation, under complicated sea area environment, guarantee pile foundation construction's security provides the reliable pile foundation structure of intensity.
Drawings
Fig. 1 is a schematic view of a three-stage large-diameter cast-in-situ bored pile structure according to the present invention.
Fig. 2 is a schematic view of the upper pile structure of the present invention.
Fig. 3 is a sectional view of an upper pile structure of the present invention.
Fig. 4 is a schematic view of a mid-section pile structure of the present invention.
Fig. 5 is a cross-sectional view of a mid-section pile structure of the present invention.
Fig. 6 is a schematic view of a lower pile structure of the present invention.
Fig. 7 is a cross-sectional view of a lower pile structure of the present invention.
Description of the reference numerals
The concrete pile comprises a concrete pile body 1, an inner main reinforcement 2, an upper section outer main reinforcement 3, a lower section outer main reinforcement 4, an outer stirrup 5, a middle section stirrup 6, a perforated H-shaped steel cylindrical support 7, a triangular cylindrical angle steel support 8 and a sounding pipe 9.
Detailed Description
The technical solution of the three-section large-diameter cast-in-situ bored pile structure according to the present invention will be further described with reference to the following embodiments and accompanying drawings. The advantages and features of the present invention will become more apparent in conjunction with the following description.
It should be noted that the embodiments of the present invention have better practicability, and are not intended to limit the present invention in any form.
The drawings of the present invention are in simplified form and are not to scale, but rather are provided for the purpose of facilitating and clearly illustrating embodiments of the present invention and are not intended to limit the scope of the invention in which the invention may be practiced.
The invention provides a three-section large-diameter cast-in-situ bored pile structure.
As shown in fig. 1 to 7, the diameter of the large-diameter cast-in-situ bored pile is 4.9m, and the entire cast-in-situ bored pile structure is divided into an upper section, a middle section, and a lower section from top to bottom, and the length of each section is 15 m.
The inner main reinforcement 2 and the outer main reinforcement 3 of the upper section of the large-diameter cast-in-situ bored pile are phi 40; every two inner main reinforcements 2 of 156 are arranged in a group in a vertically abutting manner, the inner main reinforcements are uniformly distributed at the outer position inside the circular pile body in a circumferential manner, and the radius of the circumference formed by the inner main reinforcements 2 is 2.15 m; every two upper-section outer main ribs 3 are vertically and closely arranged in a group, and are circumferentially and uniformly distributed on the outer side of the inner main rib 2, so that the radius of the formed circumference is 2.35 m; the outer stirrups 5 are circular-ring-shaped steel bars with the specification phi 16, the outer stirrups 5 are uniformly arranged at intervals of 10cm from top to bottom, and the upper-section outer main reinforcement 3 is hooped and bound and fixed by thin steel wires; the perforated H-shaped steel cylindrical support 7 is a circular ring-shaped member made of H-shaped steel, the specification of the H-shaped steel is 160 multiplied by 150 multiplied by 8, a web plate of the section steel is provided with uniformly distributed round holes with the diameter of 10cm, the perforated H-shaped steel cylindrical support 7 is vertically distributed between the outer main rib 3 and the inner main rib 2 at intervals of 2m, the inner part and the outer part are tightly abutted, and the perforated H-shaped steel cylindrical support is bound and fixed through thin steel wires;
the vertical distribution mode of the main reinforcement 2 at the inner side of the middle section structure of the large-diameter cast-in-situ bored pile is completely the same as that of the upper section structure; the specification of the middle-section stirrups 6 is the same as that of the outer-side stirrups 5, the middle-section stirrups 6 are uniformly arranged at intervals of 10cm from top to bottom, and the inner-side main reinforcements 2 are hooped and bound and fixed by thin steel wires; the triangular cylindrical angle steel bracket 8 is a circular component made of angle steel, the specification of the angle steel is 70 multiplied by 8, three steel bars are welded on the inner side of the angle steel circle in an equilateral triangle manner, the triangular cylindrical angle steel bracket 8 is uniformly distributed on the inner side of the inner side main rib 2 at intervals of 2m in the vertical direction and is bound and fixed through thin steel wires;
the specifications of the inner main reinforcement 2 and the outer main reinforcement 4 of the lower section structure of the large-diameter cast-in-situ bored pile are the same, and the number of the inner main reinforcement and the outer main reinforcement is 312; the vertical distribution mode of the inner main reinforcement 2 is completely the same as the structures of the upper section and the middle section; every two outer main ribs 4 on the lower section are vertically and closely arranged in a group, and are uniformly distributed on the outer side of the inner main rib 2 in a circumferential mode; the arrangement mode of the H-shaped steel cylindrical support 7 with the holes and the outer stirrups 5 is the same as that of the upper section structure.
The upper and lower parts of the inner main reinforcement 2 in the upper section, the middle section and the lower section of the large-diameter cast-in-situ bored pile are vertically connected and are connected by adopting reinforcement joints in a one-to-one correspondence manner;
after the connection of the steel reinforcement cages of the three-section structure is finished, the steel reinforcement cages are placed into a vertical deep hole formed by a drilling method, concrete is integrally poured to form a concrete pile body 1, and then an integral structure is formed;
4 sounding pipes 9 are arranged inside the pile body, and the sounding pipes 9 are vertically distributed and are close to the inner side of the inner main rib 2 and used for detecting the quality of the pile body in the pile foundation construction process and after completion by adopting a sound wave measuring method.
The concrete construction process comprises the following steps:
the first step is as follows: and (5) binding a reinforcement cage. And (3) respectively binding reinforcement cages of the upper section, the middle section and the lower section of the cast-in-situ bored pile according to design requirements, firmly connecting the inner main reinforcements 2 of the upper section, the middle section and the lower section by adopting reinforcement joints, and binding the full-length sounding pipe 9.
The second step is that: and (5) forming holes on the pile foundation. And according to design requirements, combining the hydrological environment conditions of a construction site, and completing pile foundation pore-forming by adopting a drilling method.
The third step: and placing a reinforcement cage. The entire length of the reinforcement cage is placed into the drilled hole.
The fourth step: and (5) pouring concrete. And (3) pouring sufficient concrete into the hole, and detecting the integrity of the pile body by using the acoustic pipe during and after the pouring.
The above description is only illustrative of the preferred embodiments of the present invention and should not be taken as limiting the scope of the invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure should be considered as equivalent effective embodiments, and all the changes or modifications should fall within the protection scope of the technical solution of the present invention.
Claims (2)
1. The utility model provides a syllogic major diameter bored concrete pile structure which characterized in that: the whole cast-in-situ bored pile is vertically built below the ground, is in a cylinder with a certain length, is divided into three sections from top to bottom, namely an upper section, a middle section and a lower section, and adopts different reinforcement cage structural forms;
the upper section structure of the large-diameter cast-in-situ bored pile consists of a concrete pile body (1), an inner side main reinforcement (2), an upper section outer side main reinforcement (3), an outer side stirrup (5), a perforated H-shaped steel cylindrical support (7) and a sound measuring pipe (9); the inner main reinforcement (2) and the upper section outer main reinforcement (3) are steel bars with the same specification; every two inner main reinforcements (2) with a certain number are vertically arranged in a group in an abutting mode, and are circumferentially and uniformly distributed at the positions close to the outside in the circular pile body; every two upper-section outer main ribs (3) are vertically arranged in a group in an abutting mode, are uniformly distributed on the outer side of the inner main rib (2) in a circumferential mode, and the number of the upper-section outer main ribs (3) is 2/3 of the inner main rib (2); the outer stirrups (5) are circular-ring-shaped steel bars, the diameter of the steel bars is smaller, the inner diameter of the circular ring of the outer stirrups (5) is equal to the outer diameter of the circumference formed by the arrangement of the upper outer main reinforcements (3), a certain number of outer stirrups (5) are uniformly arranged up and down, and the upper outer main reinforcements (3) are hooped and bound and fixed by thin steel wires; the H-shaped steel cylindrical supports (7) with holes are annular members made of H-shaped steel, round holes are uniformly distributed on a steel web, a certain number of H-shaped steel cylindrical supports (7) with holes are vertically and uniformly distributed between the main ribs (3) on the outer side and the main ribs (2) on the inner side of the upper section, the inner and the outer parts are tightly abutted, and the H-shaped steel cylindrical supports are bound and fixed through thin steel wires;
the middle section structure of the large-diameter cast-in-situ bored pile consists of a concrete pile body (1), an inner side main reinforcement (2), a middle section stirrup (6), a triangular cylindrical angle steel bracket (8) and a sound measuring pipe (9); the vertical distribution mode of the inner main ribs (2) is completely the same as that of the upper section structure; the middle-section stirrups (6) are circular-ring-shaped steel bars, the diameter of the steel bars is smaller, the inner diameter of a circular ring of the middle-section stirrups (6) is equal to the outer diameter of a circle formed by arranging the inner-side main reinforcements (2), a certain number of the middle-section stirrups (6) are uniformly arranged up and down, and the inner-side main reinforcements (2) are hooped and bound and fixed by thin steel wires; the triangular cylindrical angle steel bracket (8) is a circular component made of angle steel, three steel bars are welded on the inner side of an angle steel circle in an equilateral triangle mode to improve the overall rigidity of the triangular cylindrical angle steel bracket (8), and a certain number of the triangular cylindrical angle steel brackets (8) are vertically and uniformly distributed on the inner side of the inner main rib (2) and are bound and fixed through thin steel wires;
the lower section structure of the large-diameter cast-in-situ bored pile consists of a concrete pile body (1), an inner side main reinforcement (2), a lower section outer side main reinforcement (4), an outer side stirrup (5), a perforated H-shaped steel cylinder support (7) and a sound measuring pipe (9); the inner main reinforcement (2) and the lower section outer main reinforcement (4) are steel bars with the same specification and the same quantity; the vertical distribution mode of the inner main ribs (2) is completely the same as the structures of the upper section and the middle section; every two outer main ribs (4) at the lower section are vertically and closely arranged in a group, and are uniformly distributed at the outer side of the inner main rib (2) in a circumferential mode; a certain number of outer stirrups (5) are uniformly arranged up and down, and the lower section of outer main reinforcement (4) is hooped and bound and fixed by thin steel wires; a certain number of H-shaped steel cylinder supports (7) with holes are vertically and uniformly distributed between the outer main rib (4) and the inner main rib (2) of the lower section, tightly lean against each other and are bound and fixed through thin steel wires;
the distribution forms of the inner main reinforcements (2) in the upper section, the middle section and the lower section of the large-diameter cast-in-situ bored pile are completely the same, and the upper section, the lower section and the upper section are vertically connected and are connected by adopting steel bar joints in a one-to-one correspondence manner;
in the construction process, after the reinforcement cages of the three-section structure are connected, the reinforcement cages are placed in a vertical deep hole formed by a drilling method, concrete is integrally poured to form a concrete pile body (1), and then an integral structure is formed;
the length and the diameter of the whole large-diameter cast-in-situ bored pile depend on actual engineering requirements, and the length distribution of the upper section, the middle section and the lower section structure depends on the structural design requirements of the upper structure.
2. The three-section large-diameter cast-in-situ bored pile structure according to claim 1, wherein: a plurality of sound measuring tubes (9) with full length are arranged inside the pile body, the sound measuring tubes (9) are vertically distributed and are close to the inner side of the inner side main rib (2) and used for detecting the integrity of the pile body by adopting a sound wave measuring method in the pile foundation construction process and after completion.
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| CN201910280978.0A CN110144885B (en) | 2019-04-09 | 2019-04-09 | Three-section type major diameter bored pile structure |
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| CN201910280978.0A CN110144885B (en) | 2019-04-09 | 2019-04-09 | Three-section type major diameter bored pile structure |
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| CN110144885B true CN110144885B (en) | 2021-04-06 |
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| CN110565688B (en) * | 2019-09-16 | 2020-10-16 | 北京市市政四建设工程有限责任公司 | Deeply-buried PBA subway station enclosing side pile |
| CN111455981B (en) * | 2020-04-05 | 2021-11-16 | 上海民航新时代机场设计研究院有限公司 | Concrete cast-in-place pile of sludge texture foundation and construction method thereof |
| CN113863286A (en) * | 2021-10-14 | 2021-12-31 | 中铁大桥局第七工程有限公司 | Installation device of variable cross-section major diameter overlength steel reinforcement cage |
| CN115506338A (en) * | 2022-09-07 | 2022-12-23 | 苏州交通工程集团有限公司 | Construction process of bridge underwater cast-in-place bored pile |
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| JP4389093B2 (en) * | 1998-06-26 | 2009-12-24 | 三谷セキサン株式会社 | Ready-made concrete piles with reinforcing bars at the lower end, reinforcing bar cages, foundation pile structures, construction methods for foundation piles |
| CN103132506B (en) * | 2011-11-29 | 2015-11-25 | 上海市基础工程集团有限公司 | Bored pile double-deck Reinforced Hoop reinforcing cage processing and fabricating method |
| CN205604232U (en) * | 2016-05-06 | 2016-09-28 | 中铁十局集团第二工程有限公司 | Drilled pile pile foundation steel reinforcement cage positioner |
| CN207714309U (en) * | 2017-11-09 | 2018-08-10 | 上海工程勘察设计有限公司 | Borehole filling pile cage of reinforcement |
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