CN112376598A - PHC pipe pile and highway bridge bearing platform connecting structure and construction method - Google Patents
PHC pipe pile and highway bridge bearing platform connecting structure and construction method Download PDFInfo
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- E02D27/00—Foundations as substructures
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Abstract
A PHC tubular pile and expressway bridge bearing platform connection structure and a construction method are disclosed, wherein when the elevation of the pile top is not lower than the design elevation of the bearing platform, the PHC tubular pile and expressway bridge bearing platform connection structure comprises a PHC tubular pile, a supporting plate, a tubular pile steel bar framework, core filling concrete, a bearing platform cushion layer, a bearing platform steel bar framework and bearing platform concrete; when the elevation of the pile top is lower than the designed elevation of the bearing platform, and the elevation difference is smaller than twice the pile diameter, the PHC pile comprises a PHC pile, a supporting plate, a pile pipe steel bar framework, core filling concrete, a pile splicing bottom surface foundation cushion layer, pile splicing concrete, a pile splicing steel bar framework, a bearing platform cushion layer, a bearing platform steel bar framework and bearing platform concrete. The invention further comprises a construction method for connecting the PHC pipe pile with the expressway bridge bearing platform. The invention has the advantages of simple construction, reliable connection, environmental protection and the like.
Description
Technical Field
The invention relates to a connecting structure of a PHC pipe pile and a highway bridge bearing platform and a construction method.
Background
The PHC (Pre-stressed high-strength concrete) pipe pile is a concrete prefabricated member formed by combining high-performance concrete and a prestressing technology, has the advantages of high single-pile bearing capacity, low construction cost and quick construction, and is widely applied to house construction at present. Compared with a cast-in-situ bored pile, the PHC tubular pile is prefabricated in a factory, mud does not need to be discharged, and the construction has the advantages of factory production, standardization, rapidness and the like. Therefore, the drilling and pouring pile foundation of the soft foundation section bridge is optimally designed into a PHC (prestressed high-strength concrete) pipe pile foundation, the problems existing in the construction of the original drilling and pouring pile are solved through the optimal design, the green construction is realized, and certain economic benefits are achieved. However, the application of the PHC pile in the bridge foundation is relatively few at present, and the connection technology of the PHC pile and the bridge bearing platform has not been studied yet.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects and shortcomings in the background technology and provides a connecting structure of a PHC pipe pile and a highway bridge bearing platform and a construction method.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a PHC tubular pile and highway bridge bearing platform connection structure comprises a PHC tubular pile, a supporting plate, a tubular pile steel bar framework, core filling concrete, a bearing platform cushion layer, a bearing platform steel bar framework and bearing platform concrete when the elevation of the pile top is not lower than the design elevation of the bearing platform; the pile head of the PHC pipe pile is exposed out of a cushion layer of a bearing platform, the inner wall of the PHC pipe pile is coated with cement paste, a concrete interface agent or micro-expansion concrete, the supporting plate is installed in a hole of the PHC pipe pile, the pipe pile reinforcement cage is installed on the supporting plate in the hole of the PHC pipe pile, the core filling concrete is poured on the pile top of the PHC pipe pile, the reinforcement cage of the bearing platform is connected with the reinforcement cage of the pipe pile, and the concrete of the bearing platform is poured on the cushion layer of the bearing platform;
when the elevation of the pile top is lower than the designed elevation of the bearing platform and the elevation difference is less than two times of the pile diameter, the PHC pile comprises a PHC pile, a supporting plate, a pile pipe steel bar framework, core filling concrete, a pile splicing bottom surface foundation cushion layer, pile splicing concrete, a pile splicing steel bar framework, a bearing platform cushion layer, a bearing platform steel bar framework and bearing platform concrete; PHC tubular pile head exposes pile extension bottom surface foundation bed course, the PHC tubular pile inner wall is applied paint grout, concrete interfacial agent or micro-expansion concrete with a brush, the layer board is installed in the PHC tubular pile downthehole, tubular pile framework of reinforcement installs on the downthehole layer board of PHC tubular pile, fill core concrete and water at PHC tubular pile top, pile extension framework of reinforcement is connected with tubular pile framework of reinforcement, pile extension concrete waters on pile extension bottom surface foundation bed course, cushion cap framework of reinforcement is connected with pile extension framework of reinforcement, cushion cap concrete placement is on the cushion cap bed course.
Further, when the elevation of the pile top is not lower than the designed elevation of the bearing platform, the tubular pile steel bar framework consists of longitudinal steel bars and spiral steel bars, and concrete positioning blocks are bound on two sides of the tubular pile steel bar framework; the longitudinal steel bars of the exposed pile head adopt a flaring form so as to increase the connection with the steel bar framework of the bearing platform.
Further, when the elevation of the pile top is lower than the designed elevation of the bearing platform, and the elevation difference is less than two times of the pile diameter, the tubular pile steel bar framework consists of longitudinal steel bars and spiral steel bars, and concrete positioning blocks are bound on two sides of the tubular pile steel bar framework; the longitudinal steel bar of the exposed pile head adopts a flaring form so as to increase the connection with the pile splicing steel bar framework.
Further, the pile splicing steel bar framework consists of longitudinal steel bars and horizontal steel bars; the longitudinal steel bars exposed out of the bearing platform adopt a flaring form so as to be additionally connected with the bearing platform steel bar framework.
A construction method of a PHC pipe pile and highway bridge bearing platform connection structure,
when the elevation of the pile top is not lower than the designed elevation of the bearing platform, the method comprises the following steps:
(A1) when the PHC pipe pile is constructed in place, excavating earthwork to form a bearing platform foundation pit;
(A2) pouring a cushion layer of the bearing platform;
(A3) cleaning up the floating soil and slurry on the inner wall of the PHC pipe pile hole, and coating cement slurry, a concrete interface agent or micro-expansive concrete on the inner wall of the PHC pipe pile hole;
(A4) using a round steel plate as a supporting plate, and hanging the supporting plate in the PHC tubular pile hole by using a steel bar;
(A5) installing a tubular pile reinforcement framework;
(A6) pouring core filling concrete at the pile top of the PHC tubular pile;
(A7) installing a pile cap steel bar framework, and firmly welding the pipe pile steel bar framework and the pile cap steel bar framework, wherein the anchoring length must meet the specification and design requirements;
(A8) pouring bearing platform concrete;
when the elevation of the pile top is lower than the designed elevation of the bearing platform, and the elevation difference is less than twice the pile diameter, the method comprises the following steps:
(B1) after the PHC pipe pile is constructed in place, excavating earthwork to form a bearing platform foundation pit, excavating the earthwork on the foundation till the pile head of the PHC pipe pile is exposed, and forming a pile splicing concrete working surface;
(B2) pouring a cushion layer of the bearing platform;
(B3) pouring a pile splicing bottom foundation cushion layer;
(B4) cleaning up the floating soil and slurry on the inner wall of the PHC pipe pile hole, and coating cement slurry, a concrete interface agent or micro-expansive concrete on the inner wall of the PHC pipe pile hole;
(B5) using a round steel plate as a supporting plate, and hanging the supporting plate in the PHC tubular pile hole by using a steel bar;
(B6) installing a tubular pile reinforcement framework;
(B7) pouring core filling concrete at the pile top of the PHC tubular pile;
(B8) installing a pile splicing steel bar framework, and firmly welding the tubular pile steel bar framework and the pile splicing steel bar framework, wherein the anchoring length must meet the specification and design requirements;
(B9) pouring pile-connecting concrete;
(B10) installing a pile splicing steel reinforcement framework, and firmly welding the pile splicing steel reinforcement framework and the pile splicing steel reinforcement framework, wherein the anchoring length must meet the specification and design requirements;
(B11) and pouring bearing platform concrete.
Preferably, in the step (a 1), the earth excavation depth reaches the design requirement, and the head of the PHC pile protrudes by 15 cm.
Preferably, in the step (A2), the cushion layer of the bearing platform is cast by C25 concrete, and the casting thickness is generally 10-15 cm.
Preferably, in the step (a 6), the strength grade of the core filling concrete of the pile top of the PHC pile is higher than that of the bearing platform or the foundation concrete by one grade; the core was grouted with C50 concrete.
Preferably, in the step (B1), the section of the excavation pile splicing working face is circular, the diameter is 1.0m, the height is less than twice the pile diameter D, and the excavation depth is such that the head of the PHC pile is 20cm exposed.
Preferably, in the step (B2) and the step (B3), the cushion layer is cast by C25 concrete, and the thickness is generally 10-15 cm.
Preferably, in the step (B7), the strength of the core-filling concrete of the pile top of the PHC pile is higher than that of the bearing platform or the foundation concrete by one grade, and the core is filled with C50 concrete.
Preferably, in the step (B9), the pile-connecting concrete is cast by using C40 concrete.
The invention has the beneficial effects that: the PHC tubular pile can be prefabricated in a factory without discharging slurry, and has the advantages of factory production, standardization, rapidness and the like in construction.
Drawings
FIG. 1 is a schematic view of a connecting structure of a PHC pipe pile and a highway bridge bearing platform (when the elevation of the pile top is not lower than the designed elevation of the bearing platform);
FIG. 2 is a schematic view of a connection structure of a PHC pipe pile and a highway bridge bearing platform (when the elevation of the pile top is lower than the designed elevation of the bearing platform, and the elevation difference is less than two times of the pile diameter);
in fig. 1: 1. PHC tubular pile; 2. a support plate; 3. hooping; 4. anchoring the reinforcing steel bars; 5. filling core concrete; 6. a concrete positioning block; 7. a cushion layer of the bearing platform; 8. concrete for bearing platform; 9. the diameter of the tubular pile; 10. filling the core height; 11. the exposed height of the tubular pile; 12. the exposed height of the anchoring steel bar;
in fig. 2: 1. PHC tubular pile; 2. a support plate; 3. hooping; 4. anchoring the reinforcing steel bars; 5. filling core concrete; 6. a concrete positioning block; 7. a cushion layer of the bearing platform; 8. concrete for bearing platform; 9. the diameter of the tubular pile; 10. filling the core height; 11. the exposed height of the tubular pile; 12. the exposed height of the anchoring steel bar; 13. pile splicing bottom foundation cushion; 14. pile splicing concrete; 15. pile splicing stirrups; 16. pile splicing and steel bar anchoring; 17. pile extension section width; 18. pile extension section height; 19. the exposed height of the pile splicing anchoring steel bar; 20. and (5) pile splicing anchoring steel bars are expanded outwards.
Detailed Description
In order to facilitate understanding of the invention, the invention will be described in more complete detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the following specific embodiments.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Referring to fig. 1, the connecting structure of the PHC tubular pile and the expressway bridge bearing platform comprises a PHC tubular pile 1, a supporting plate 2, a tubular pile reinforcement cage, core filling concrete 5, a bearing platform cushion layer 7, a bearing platform reinforcement cage and bearing platform concrete 8 when the elevation of the pile top is not lower than the designed elevation of the bearing platform; 1 pile head of PHC tubular pile exposes cushion layer 7, grout, concrete interfacial agent or micro-expansion concrete are applied paint with a brush to 1 inner wall of PHC tubular pile, layer board 2 hangs in 1 downthehole PHC tubular pile through the reinforcing bar, tubular pile steel reinforcement framework installs on 1 downthehole layer board 2 of PHC tubular pile, fill core concrete 5 and water at 1 pile bolck of PHC tubular pile, cushion layer steel reinforcement framework is connected with tubular pile steel reinforcement framework, cushion layer concrete 8 pours on cushion layer 7.
The tubular pile steel reinforcement framework is composed of longitudinal steel reinforcements (anchoring steel reinforcements 4) and spiral reinforcements (stirrups 3), a 3.5 cm-thick concrete positioning block 6 is bound on two sides, the height of the exposed pile head longitudinal steel reinforcements is 80cm, and a flaring form is adopted to connect the pile head steel reinforcement framework with the bearing platform.
The construction method comprises the following steps:
(1) after the PHC tubular pile 1 is constructed in place, excavating earthwork to form a bearing platform foundation pit;
(2) pouring a cushion layer 7 of the bearing platform;
(3) cleaning up the floating soil and slurry on the inner wall of the hole of the PHC tubular pile 1, and coating cement slurry, a concrete interface agent or micro-expansive concrete on the inner wall of the hole of the PHC tubular pile 1 so as to improve the integrity of the core filling concrete and the pile body concrete of the PHC tubular pile 1;
(4) using a round thin steel plate as a supporting plate 2, and hanging the round thin steel plate in a hole of the PHC tubular pile 1 by using a steel bar;
(5) installing a tubular pile reinforcement cage: the anchoring steel bars 4, the stirrups 3 and the concrete positioning blocks 6;
(6) pouring core filling concrete 5 on the pile top of the PHC tubular pile 1;
(7) installing a pile cap steel bar framework, and firmly welding the pipe pile steel bar framework and the pile cap steel bar framework, wherein the anchoring length must meet the specification and design requirements;
(8) and pouring the bearing platform concrete 8.
In the step (1), the earth excavation depth reaches the design requirement, and the pile head of the PHC pipe pile 1 is exposed by 15 cm.
In the step (2), the cushion layer 7 of the bearing platform is cast by C25 concrete, and the casting thickness is generally 10-15 cm.
In the step (4), the round thin steel plate is 5mm thick, and the round steel plate is hung in the hole 1 of the PHC tubular pile by a steel bar with the diameter of 20mm to be used as a supporting plate.
In the step (6), the strength grade of the core filling concrete of the pile top of the PHC tubular pile 1 is higher than that of the bearing platform or the foundation concrete by one grade, and the core is filled with C50 concrete.
Referring to fig. 2, a PHC tubular pile and highway bridge bearing platform connecting structure, when the elevation of the pile top is lower than the designed elevation of the bearing platform and the elevation difference is less than twice of the pile diameter, comprises a PHC tubular pile 1, a supporting plate 2, a tubular pile reinforcement cage, core filling concrete 5, a pile splicing bottom foundation bed course 13, pile splicing concrete 14, a pile splicing reinforcement cage, a bearing platform bed course 7, a bearing platform reinforcement cage and bearing platform concrete 8; pile head of 1 PHC tubular pile exposes pile extension bottom surface foundation bed course 13, 1 inner wall of PHC tubular pile is applied paint grout, concrete interfacial agent or micro-expansion concrete with a brush, layer board 2 hangs in 1 downthehole PHC tubular pile through the reinforcing bar, tubular pile steel reinforcement framework installs on 1 downthehole layer board 2 of PHC tubular pile, fill core concrete 5 and water at 1 pile bolck of PHC tubular pile, pile extension steel reinforcement framework is connected with tubular pile steel reinforcement framework, 14 waters on pile extension bottom surface foundation bed course 13 in pile extension concrete, cushion cap steel reinforcement framework is connected with pile extension steel reinforcement framework, cushion cap concrete 8 pours on cushion cap 7.
The tubular pile steel reinforcement framework is composed of longitudinal steel bars (anchoring steel bars 4) and spiral steel bars (stirrups 3), a 3.5 cm-thick concrete positioning block 6 is bound on two sides, the height of the exposed pile head longitudinal steel bars is 80cm, and a flaring form is adopted to increase the height of the pile head longitudinal steel bars and connect the pile steel reinforcement framework.
The pile splicing steel bar framework consists of longitudinal steel bars (pile splicing anchoring steel bars 16) and horizontal steel bars (pile splicing stirrups 15); the longitudinal steel bars exposed out of the bearing platform are in flaring forms so as to be connected with the steel bar framework of the bearing platform in an increasing mode, the height is 80cm, the exposed horizontal stirrups are made of steel bars with the diameter of 10mm, and the distance is 100 mm.
The construction method comprises the following steps:
(1) after the PHC tubular pile 1 is constructed in place, excavating earthwork to form a bearing platform foundation pit, excavating the earthwork on the foundation pit until the pile head of the PHC tubular pile 1 is exposed, and forming a pile splicing working surface;
(2) pouring a cushion layer 7 of the bearing platform;
(3) pouring a pile connecting bottom foundation cushion layer 13;
(4) cleaning up the floating soil and slurry on the inner wall of the hole of the PHC tubular pile 1, and coating cement slurry, a concrete interface agent or micro-expansive concrete on the inner wall of the hole of the PHC tubular pile 1 so as to improve the integrity of the core filling concrete and the pile body concrete of the PHC tubular pile 1;
(5) using the round thin steel plate 2 as a supporting plate, and hanging the round thin steel plate in the hole 1 of the PHC tubular pile by using a steel bar;
(6) installing a tubular pile reinforcement cage: the anchoring steel bars 4, the stirrups 3 and the concrete positioning blocks 6;
(7) pouring core filling concrete 5 on the pile top of the PHC tubular pile 1;
(8) installing a pile splicing steel bar framework: pile extension anchoring steel bars 16 and pile extension stirrups 15; the tubular pile steel reinforcement framework and the pile splicing steel reinforcement framework are welded firmly, and the anchoring length must meet the specification and design requirements;
(9) pouring pile-connecting concrete 14;
(10) installing a pile splicing steel reinforcement framework, and firmly welding the pile splicing steel reinforcement framework and the pile splicing steel reinforcement framework, wherein the anchoring length must meet the specification and design requirements;
(11) and pouring the bearing platform concrete 8.
In the step (1), on the basis of excavating a foundation pit of a bearing platform, excavating a pile splicing working surface, wherein the pile splicing excavation section is circular, the diameter is 1.0m, the height is less than two times of the pile diameter D, and the excavation depth is such that the pile head of the PHC tubular pile 1 is exposed by 20 cm.
In the step (2) and the step (3), the cushion layer 7 of the bearing platform and the foundation cushion layer 13 of the bottom surface of the pile are cast by C25 concrete, and the thickness is generally 10-15 cm.
In the step (5), the round thin steel plate is 5mm thick, and the round steel plate is hung in the hole 1 of the PHC tubular pile by a steel bar with the diameter of 20mm to be used as a supporting plate.
In the step (7), the strength grade of the core filling concrete of the pile top of the PHC tubular pile 1 is higher than that of the bearing platform or the foundation concrete by one grade, and the core is filled with C50 concrete.
In the step (8), the longitudinal steel bars of the pile extension steel bar framework adopt phi 20mm steel bars, the spacing is 150mm, the thickness of the longitudinal steel bar protective layer is 8mm, the horizontal hooping bars in the pile extension adopt phi 10mm steel bars, and the spacing is 150 mm; the longitudinal steel bars exposed out of the bearing platform are in flaring forms so as to be connected with the steel bar framework of the bearing platform in an increasing mode, the height is 80cm, the exposed horizontal stirrups are made of steel bars with the diameter of 10mm, and the distance is 100 mm.
In the step (9), the pile splicing concrete is poured by C40 concrete.
In practice, the above methods can be optimized or expanded, all the technical features and steps can be combined arbitrarily within a reasonable range, and the division of the embodiment is only for the sake of example and reading convenience, and is not limited by the combination manner and the protection range.
While there have been shown and described what are at present considered to be the fundamental principles and essential features of the invention and advantages thereof, it will be understood by those skilled in the art that the invention is not limited to the embodiments described above, which are included to explain the principles of the invention and within the written description and drawings, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a PHC tubular pile and highway bridge cushion cap connection structure which characterized in that:
when the elevation of the pile top is not lower than the designed elevation of the bearing platform, the PHC pile comprises a PHC pile, a supporting plate, a pile reinforcement cage, core filling concrete, a bearing platform cushion layer, a bearing platform reinforcement cage and bearing platform concrete; the pile head of the PHC pipe pile is exposed out of a cushion layer of a bearing platform, the inner wall of the PHC pipe pile is coated with cement paste, a concrete interface agent or micro-expansion concrete, the supporting plate is installed in a hole of the PHC pipe pile, the pipe pile reinforcement cage is installed on the supporting plate in the hole of the PHC pipe pile, the core filling concrete is poured on the pile top of the PHC pipe pile, the reinforcement cage of the bearing platform is connected with the reinforcement cage of the pipe pile, and the concrete of the bearing platform is poured on the cushion layer of the bearing platform;
when the elevation of the pile top is lower than the designed elevation of the bearing platform and the elevation difference is less than two times of the pile diameter, the PHC pile comprises a PHC pile, a supporting plate, a pile pipe steel bar framework, core filling concrete, a pile splicing bottom surface foundation cushion layer, pile splicing concrete, a pile splicing steel bar framework, a bearing platform cushion layer, a bearing platform steel bar framework and bearing platform concrete; PHC tubular pile head exposes pile extension bottom surface foundation bed course, the PHC tubular pile inner wall is applied paint grout, concrete interfacial agent or micro-expansion concrete with a brush, the layer board is installed in the PHC tubular pile downthehole, tubular pile framework of reinforcement installs on the downthehole layer board of PHC tubular pile, fill core concrete and water at PHC tubular pile top, pile extension framework of reinforcement is connected with tubular pile framework of reinforcement, pile extension concrete waters on pile extension bottom surface foundation bed course, cushion cap framework of reinforcement is connected with pile extension framework of reinforcement, cushion cap concrete placement is on the cushion cap bed course.
2. The PHC tubular pile and expressway bridge bearing platform connection structure of claim 1, wherein: when the elevation of the pile top is not lower than the designed elevation of the bearing platform, the tubular pile steel bar framework consists of longitudinal steel bars and spiral steel bars, and concrete positioning blocks are bound on two sides of the tubular pile steel bar framework; the longitudinal steel bars of the exposed pile head adopt a flaring form so as to increase the connection with the steel bar framework of the bearing platform.
3. The PHC pile and expressway bridge deck connection structure according to claim 1 or 2, wherein: when the elevation of the pile top is lower than the designed elevation of the bearing platform, and the elevation difference is less than two times of the pile diameter, the tubular pile steel bar framework consists of longitudinal steel bars and spiral steel bars, and concrete positioning blocks are bound on two sides of the tubular pile steel bar framework; the longitudinal steel bar of the exposed pile head adopts a flaring form so as to increase the connection with the pile splicing steel bar framework.
4. The PHC pile and expressway bridge deck connection structure according to claim 1 or 2, wherein: the pile splicing steel bar framework consists of longitudinal steel bars and horizontal steel bars; the longitudinal steel bars exposed out of the bearing platform adopt a flaring form so as to be additionally connected with the bearing platform steel bar framework.
5. A construction method of a PHC pile and expressway bridge deck connection structure according to claim 1, characterized by:
when the elevation of the pile top is not lower than the designed elevation of the bearing platform, the method comprises the following steps:
(A1) when the PHC pipe pile is constructed in place, excavating earthwork to form a bearing platform foundation pit;
(A2) pouring a cushion layer of the bearing platform;
(A3) cleaning up the floating soil and slurry on the inner wall of the PHC pipe pile hole, and coating cement slurry, a concrete interface agent or micro-expansive concrete on the inner wall of the PHC pipe pile hole;
(A4) using a round steel plate as a supporting plate, and hanging the supporting plate in the PHC tubular pile hole by using a steel bar;
(A5) installing a tubular pile reinforcement framework;
(A6) pouring core filling concrete at the pile top of the PHC tubular pile;
(A7) installing a pile cap steel bar framework, and firmly welding the pipe pile steel bar framework and the pile cap steel bar framework, wherein the anchoring length must meet the specification and design requirements;
(A8) pouring bearing platform concrete;
when the elevation of the pile top is lower than the designed elevation of the bearing platform, and the elevation difference is less than twice the pile diameter, the method comprises the following steps:
(B1) after the PHC pipe pile is constructed in place, excavating earthwork to form a bearing platform foundation pit, excavating the earthwork on the foundation till the pile head of the PHC pipe pile is exposed, and forming a pile splicing concrete working surface;
(B2) pouring a cushion layer of the bearing platform;
(B3) pouring a pile splicing bottom foundation cushion layer;
(B4) cleaning up the floating soil and slurry on the inner wall of the PHC pipe pile hole, and coating cement slurry, a concrete interface agent or micro-expansive concrete on the inner wall of the PHC pipe pile hole;
(B5) using a round steel plate as a supporting plate, and hanging the supporting plate in the PHC tubular pile hole by using a steel bar;
(B6) installing a tubular pile reinforcement framework;
(B7) pouring core filling concrete at the pile top of the PHC tubular pile;
(B8) installing a pile splicing steel bar framework, and firmly welding the tubular pile steel bar framework and the pile splicing steel bar framework, wherein the anchoring length must meet the specification and design requirements;
(B9) pouring pile-connecting concrete;
(B10) installing a pile splicing steel reinforcement framework, and firmly welding the pile splicing steel reinforcement framework and the pile splicing steel reinforcement framework, wherein the anchoring length must meet the specification and design requirements;
(B11) and pouring bearing platform concrete.
6. The construction method of the PHC pile and expressway bridge deck connection structure of claim 5, wherein: in the step (A1), the earth excavation depth reaches the design requirement, and the head of the PHC tubular pile is exposed by 15 cm.
7. The construction method of the PHC pile and expressway bridge deck connection structure of claim 5, wherein: in the step (A2), pouring C25 concrete into the cushion layer of the bearing platform, wherein the thickness is 10-15 cm; in the step (A6), the strength grade of the core filling concrete of the pile top of the PHC tubular pile is higher than that of the bearing platform or the foundation concrete by one grade.
8. The construction method of the PHC pile and expressway bridge deck connection structure of claim 5, wherein: in the step (B1), the section of the excavation pile splicing working face is circular, the diameter is 1.0m, the height is less than two times of the pile diameter D, and the excavation depth enables the head of the PHC tubular pile to be exposed by 20 cm.
9. The construction method of the PHC pile and expressway bridge deck connection structure of claim 5, wherein: in the steps (B2) and (B3), the cushion layer is poured by C25 concrete, and the thickness is 10-15 cm; in the step (B7), the strength grade of the core filling concrete of the pile top of the PHC tubular pile is higher than that of the bearing platform or the foundation concrete by one grade.
10. The construction method of the PHC pile and expressway bridge deck connection structure of claim 5, wherein: in the step (B9), the pile splicing concrete is cast by adopting C40 concrete.
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| CN202011526023.8A CN112376598A (en) | 2020-12-22 | 2020-12-22 | PHC pipe pile and highway bridge bearing platform connecting structure and construction method |
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| CN113026801A (en) * | 2021-03-29 | 2021-06-25 | 中建八局第四建设有限公司 | Construction method for reinforcing steel pipe pile of construction elevator foundation |
| CN113638435A (en) * | 2021-08-20 | 2021-11-12 | 广东精特建设工程有限公司 | Concrete pipe pile with transverse damage resistance and floating resistance functions and construction method |
| CN113737777A (en) * | 2021-09-22 | 2021-12-03 | 安徽省公路桥梁工程有限公司 | Construction method for connecting precast pile and precast column with bearing platform |
| CN113832962A (en) * | 2021-09-23 | 2021-12-24 | 中国二十冶集团有限公司 | Core filling construction method for ultra-deep large-aperture PHC pile |
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