CN212270920U

CN212270920U - PHC tubular pile splicing structure

Info

Publication number: CN212270920U
Application number: CN202020440216.0U
Authority: CN
Inventors: 王飞朋; 冯飞翔; 雷明月; 刘春阳; 王泽磊; 吕可
Original assignee: Ningbo Zhongjiao Water Transport Design And Research Co ltd
Current assignee: Ningbo Zhongjiao Water Transport Design And Research Co ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2021-01-01
Anticipated expiration: 2030-03-31

Abstract

The utility model relates to a PHC tubular pile extension structure, which comprises a PHC tubular pile, wherein a first reinforcement cage is arranged on the periphery of the PHC tubular pile, the first reinforcement cage protrudes out of the pile top of the PHC tubular pile, a first concrete layer is poured at the position of the first reinforcement cage, carbon fiber cloth is wrapped on the periphery of the first concrete layer, and anti-corrosive paint is coated on the carbon fiber cloth; a second reinforcement cage is arranged at the inner core of the PHC tubular pile, protrudes out of the pile top of the PHC tubular pile and is poured with a second concrete layer; the first concrete layer and the second concrete layer are poured on the bottom surface of the foundation layer; the utility model has the advantages of simple structure, construction speed are fast, to the ground superstructure influence less, the commonality is strong.

Description

PHC tubular pile splicing structure

Technical Field

The utility model belongs to the technical field of pile foundation engineering, especially, relate to a be applied to PHC tubular pile splicing structure that PHC tubular pile sinking construction pile splicing was handled.

Background

The PHC tubular pile has the advantages of high pile body concrete strength, strong bending resistance, good corrosion resistance, strong adaptability to geological changes, reliable factory prefabrication quality, high mechanical construction degree, high construction speed, lower manufacturing cost and the like, is widely applied and popularized in water transport engineering projects in recent years, and obtains good economic and social benefits. The PHC tubular pile can select a plurality of soil qualities such as a hard clay layer or a compact sand layer (or a pebble layer), a completely weathered rock layer, a strongly weathered rock layer or a medium weathered rock layer as a pile foundation supporting layer, but when the geological conditions are extremely complex, the fluctuation change of the pile foundation supporting layer is particularly severe and irregular, the actual pile top elevation during pile sinking construction may be lower than or higher than the design value, namely, the problem of abnormal piles such as low pile driving or high pile driving occurs. For abnormal piles with complete pile bodies, the penetration and the bearing capacity of the pile foundation meet the design requirements, the abnormal piles can be treated by measures of pile extension, upper structure height adjustment, partial increase of pile caps and pile foundation connection, pile chiseling or pile supplement and the like. According to the related engineering experience, the treatment of driving high piles is simple, the pile body concrete higher than the designed part is generally removed through manual or mechanical chiseling, the treatment of driving low piles is complex, and when the treatment is improper or cannot be carried out, waste piles can be caused, and piles need to be additionally supplemented, so that the construction period and the economic loss are caused. Therefore, on the premise of ensuring safe and reliable structure and feasible construction, the pile splicing structure is adopted for driving the low piles effectively and reliably, so that the waste piles and the pile repairing are avoided as much as possible, and the key of ensuring the engineering progress and saving the construction cost is realized.

Disclosure of Invention

An object of the utility model is to overcome the not enough of prior art existence, and provide a simple structure, construction speed is fast, PHC tubular pile extension structure that the commonality is strong.

The utility model aims at completing the pile splicing structure of the PHC tubular pile by adopting the following technical scheme that the pile splicing structure of the PHC tubular pile comprises a PHC tubular pile, a first reinforcement cage is arranged at the periphery of the PHC tubular pile, the first reinforcement cage protrudes out of the pile top of the PHC tubular pile, a first concrete layer is poured at the first reinforcement cage, the periphery of the first concrete layer is wrapped with carbon fiber cloth, and the carbon fiber cloth is coated with anticorrosive paint; a second reinforcement cage is arranged at the inner core of the PHC tubular pile, protrudes out of the pile top of the PHC tubular pile and is poured with a second concrete layer; and the first concrete layer and the second concrete layer are poured on the bottom surface of the foundation layer.

As preferred, first steel reinforcement cage includes first main muscle, first stirrup, first main muscle is evenly arranged along the pile body outer wall of PHC tubular pile, first stirrup is connected the outside of first main muscle to around the steel reinforcement cage be upper and lower heliciform and arrange, the interval an of two adjacent first stirrups is 90 to 110 mm.

As preferred, the second steel reinforcement cage includes second main muscle, second stirrup, the second main muscle is evenly arranged along PHC tubular pile shaft inner wall, the second stirrup is connected the outside of second main muscle to be equidistant around the steel reinforcement cage and arrange about in proper order, its interval b is 150 to 200 mm.

Preferably, a pile circumference additional reinforcing layer is arranged outside the body of the PHC tubular pile, and the pile circumference additional reinforcing layer is laid on the bottom surface of the foundation layer.

Preferably, the pile periphery additional reinforcing steel layer comprises a third main reinforcement and a third stirrup, the third main reinforcement is inserted into the first reinforcement cage and distributed uniformly along the plane of the foundation layer, and the third stirrup is connected to the third main reinforcement and positioned outside the first reinforcement cage and distributed uniformly in a surrounding manner.

Preferably, channel steel is arranged at the inner core of the PHC tubular pile, and the channel steel is located between the inner wall of the pile body of the PHC tubular pile and the second reinforcement cage.

Preferably, the channel steel is provided with a plurality of channels and is uniformly arranged along the inner wall of the pile body of the PHC tubular pile, and the channel steel protrudes out of the pile top of the PHC tubular pile.

The utility model has the advantages that: compare with current PHC tubular pile extension structure, the utility model discloses the pile extension scheme has simple structure, construction speed is fast, influence less, the strong advantage of commonality to foundation layer superstructure, satisfies structural security and reliability requirement, can effectively solve the PHC tubular pile and beat the low condition and influence engineering progress and investment cost scheduling problem because of useless stake, benefit stake under the pile sinking construction, provides a new approach for PHC tubular pile extension.

Drawings

Fig. 1 is the structural schematic diagram of the peripheral cladding reinforced concrete of the PHC tubular pile top of the utility model.

Fig. 2 is the utility model discloses a PHC tubular pile stake core additional strengthening schematic diagram.

Fig. 3 is the cross section structure schematic diagram of the PHC tubular pile splicing structure of the utility model.

Fig. 4 is a schematic cross-sectional view of the additional reinforcing steel layer around the pile according to the present invention.

The reference numbers in the drawings are respectively: 1. PHC tubular pile; 2. a first reinforcement cage; 3. a first concrete layer; 4. carbon fiber cloth; 5. a second reinforcement cage; 6. a second concrete layer; 7. a base layer; 8. adding a reinforcing steel bar layer around the pile; 9. channel steel; 10. constructing a bottom template; 21. a first main rib; 22. a first stirrup; 51. a second main rib; 52. a second stirrup; 81. a third main rib; 82. and a third stirrup.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings: as shown in the attached drawings 1 to 3, the utility model comprises a PHC tubular pile 1, a first reinforcement cage 2 is arranged on the periphery of the PHC tubular pile 1, the first reinforcement cage 2 protrudes out of the pile top of the PHC tubular pile 1, a first concrete layer 3 is poured at the position of the first reinforcement cage 2, the periphery of the first concrete layer 3 is wrapped with carbon fiber cloth 4, and anti-corrosive paint is coated on the carbon fiber cloth 4, thus the service life of the poured concrete is greatly prolonged; a second reinforcement cage 5 is arranged at the inner core of the PHC tubular pile 1, the second reinforcement cage 5 protrudes out of the pile top of the PHC tubular pile 1, and a second concrete layer 6 is poured at the second reinforcement cage 5; the first concrete layer 3 and the second concrete layer 6 are poured on the bottom surface of the foundation layer 7, and the foundation layer 7 is a beam or an abutment in design construction; the periphery of the pile top of the PHC tubular pile driven by sinking construction is coated with a first concrete layer 3, the coating range is from 100mm above the bottom surface of the upper structure of the foundation layer 7 to 1.5 times of the diameter of the tubular pile below the actual pile top, and the thickness of the coated first concrete layer 3 is not less than 0.25 time of the diameter of the tubular pile. The coating range of the second concrete layer 6 is determined according to the range of the first concrete layer 3, and the lower boundary of the second concrete layer is located below the bottom surface of the first concrete layer 3 and not less than 2 times of the pile diameter of the pipe pile and is abutted against a construction bottom template 10 arranged in a pile core of the PHC pipe pile 1; the PHC tubular pile splicing structure is suitable for pile splicing scheme treatment when a construction tubular pile is lower than the bottom surface of a foundation layer 7 within a range of 1 m. Compare with current PHC tubular pile extension structure, the utility model discloses the pile extension scheme has simple structure, construction speed is fast, influence less, the strong advantage of commonality to foundation layer superstructure, satisfies structural security and reliability requirement, can effectively solve the PHC tubular pile and beat the low condition and influence engineering progress and investment cost scheduling problem because of useless stake, benefit stake under the pile sinking construction, provides a new approach for PHC tubular pile extension.

In order to improve the structural strength between the first concrete layer 3 and the first reinforcement cage 2, the first reinforcement cage 2 comprises a first main reinforcement 21, the first main reinforcement 21 adopts HRB 400-grade reinforcement and a first stirrup 22, and the first stirrup 22 adopts HPB 300-grade reinforcement; the first main ribs 21 are uniformly arranged along the outer wall of the pile body of the PHC tubular pile 1, the length of the first main ribs extending into the foundation layer 7 is not smaller than 40 times of the diameter of the first main ribs, and the clear distance between the first main ribs and the outer wall of the pile body is not smaller than 50 mm; the first stirrups 22 are connected to the outer side of the first main reinforcement 21 and are arranged spirally up and down around the reinforcement cage, and the distance a between two adjacent first stirrups 22 is 90 to 110mm, preferably 100 mm.

In order to improve the structural strength between the second concrete layer 6 and the second reinforcement cage 5, the second reinforcement cage 5 comprises a second main reinforcement 51, the second main reinforcement 51 adopts HRB 400-grade reinforcement, a second stirrup 52, and the second stirrup 52 adopts HPB 300-grade reinforcement; the second main ribs 51 are uniformly arranged along the inner wall of the pile body of the PHC tubular pile 1, and the length of the second main ribs extending into the foundation layer 7 is not less than 40 times of the diameter of the second main ribs; the second stirrups 52 are connected on the outside of second main muscle 51 to be arranged about the steel reinforcement cage in an equidistant order from top to bottom, and its interval b is 150 to 200mm, and its preferred 180 mm.

The first concrete layer 3 and the second concrete layer 6 are formed by pouring micro-expansion concrete, and the strength grade of the micro-expansion concrete is not lower than that of the concrete of the foundation layer 7; this makes the intensity between first concrete layer 3, second concrete layer 6 and PHC tubular pile 1 more stable.

In order to improve the strength between a poured concrete layer and a foundation layer, pile periphery additional reinforcing steel layers 8 are arranged outside the pile body of the PHC tubular pile 1, and the pile periphery additional reinforcing steel layers 8 are laid on the bottom surface of the foundation layer 7; as shown in fig. 4, the pile periphery additional reinforcement layer 8 includes a third main reinforcement 81 and a third hoop reinforcement 82, the third main reinforcement 81 is inserted into the first reinforcement cage 2 and distributed uniformly along the plane of the foundation layer 7, and the third hoop reinforcement 82 is connected to the third main reinforcement 81 and located outside the first reinforcement cage 2 and distributed uniformly in a surrounding manner; therefore, the strength of the concrete layer and the foundation layer poured on the pile top of the PHC tubular pile 1 is better.

In order to further improve the strength between the PHC tubular pile and the concrete layer, a channel steel 9 is arranged at the inner core of the PHC tubular pile 1, and the channel steel 9 is positioned between the inner wall of the PHC tubular pile body and the second reinforcement cage 5; the channel-section steel 9 is equipped with a plurality of roots to evenly arrange along PHC tubular pile shaft inner wall, horizontal shearing force is more even like this, and this channel-section steel 9 protrusion is in PHC tubular pile 1 pile bolck.

The present invention is not limited to the above embodiments, and any change is made on the shape or material composition, and all the structural designs provided by the present invention are all the deformation of the present invention, which should be considered within the protection scope of the present invention.

Claims

1. The utility model provides a PHC tubular pile extension structure, includes PHC tubular pile (1), its characterized in that: a first reinforcement cage (2) is installed on the periphery of the PHC tubular pile (1), the first reinforcement cage (2) protrudes out of the pile top of the PHC tubular pile (1), a first concrete layer (3) is poured at the position of the first reinforcement cage (2), carbon fiber cloth (4) is wrapped on the periphery of the first concrete layer (3), and anticorrosive paint is coated on the carbon fiber cloth (4); a second reinforcement cage (5) is installed at the inner core of the PHC tubular pile (1), the second reinforcement cage (5) protrudes out of the pile top of the PHC tubular pile (1), and a second concrete layer (6) is poured at the second reinforcement cage (5); and the first concrete layer (3) and the second concrete layer (6) are poured on the bottom surface of the foundation layer (7).

2. The PHC pile extension structure according to claim 1, wherein: first steel reinforcement cage (2) include first main muscle (21), first stirrup (22), first main muscle (21) are evenly arranged along the pile body outer wall of PHC tubular pile (1), first stirrup (22) are connected the outside of first main muscle (21) to around steel reinforcement cage be upper and lower heliciform and arrange, the interval an of double-phase adjacent first stirrup (22) is 90 to 110 mm.

3. The PHC pile extension structure according to claim 1, wherein: second steel reinforcement cage (5) include second owner muscle (51), second stirrup (52), second owner muscle (51) are evenly arranged along PHC tubular pile (1) pile body inner wall, second stirrup (52) are connected the outside of second owner muscle (51) to be equidistant around the steel reinforcement cage and arrange about in proper order and arrange, its interval b is 150 to 200 mm.

4. The PHC pile extension structure according to claim 1, wherein: additional reinforcing steel layers (8) around the pile are arranged outside the pile body of the PHC tubular pile (1), and the additional reinforcing steel layers (8) around the pile are laid on the bottom surface of the foundation layer (7).

5. The PHC tubular pile extension structure of claim 4, which is characterized in that: pile week additional reinforcement layer (8) include third main muscle (81), third stirrup (82), third main muscle (81) insert to first steel reinforcement cage (2) in to distribute the formula evenly along foundation bed (7) plane, third stirrup (82) are connected on third main muscle (81) to be around the formula and evenly arrange outside being located first steel reinforcement cage (2).

6. The PHC pile extension structure according to claim 1, wherein: channel-section steel (9) have been arranged to PHC tubular pile (1) inner core department, channel-section steel (9) are located between PHC tubular pile body inner wall and second steel reinforcement cage (5).

7. The PHC tubular pile extension structure of claim 6, which is characterized in that: the channel steel (9) is provided with a plurality of roots and is evenly arranged along the inner wall of the pile body of the PHC tubular pile, and the channel steel (9) protrudes out of the pile top of the PHC tubular pile (1).