CN107964975B - Construction method of PBL (Poly-p-phenylene benzobisoxazole) shear force key connection structure of steel pipe composite pile and bearing platform - Google Patents
Construction method of PBL (Poly-p-phenylene benzobisoxazole) shear force key connection structure of steel pipe composite pile and bearing platform Download PDFInfo
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02D27/00—Foundations as substructures
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Abstract
The invention discloses a PBL shear key connection structure of a steel pipe composite pile and a bearing platform and a construction method thereof. The part of the steel casing extending into the bearing platform is provided with the hole, the bearing platform stressed steel bar penetrates through the hole to form a PBL shear key connection structure, the steel casing also serves as a construction casing, and after construction is completed, the steel casing serves as a permanent structure to participate in stress, so that the function of the steel casing is fully exerted. The steel casing and the concrete are stressed cooperatively to resist horizontal and vertical loads together, and the steel casing is particularly suitable for structures in high seismic intensity areas, structures under strong scouring and deep water structures.
Description
Technical Field
The invention belongs to the technology of bridge pile foundations, and particularly relates to a PBL (Poly Butylene glycol ester) shear key connection structure of a steel pipe composite pile and a bearing platform, and a construction method of the PBL shear key connection structure of the steel pipe composite pile and the bearing platform.
Background
The steel pipe composite pile mainly comprises a steel pile casing and a concrete pile positioned in the steel pile casing. In recent years, large-diameter steel pipe composite piles are widely applied to deep water foundation engineering of super-huge type sea-crossing bridges, harbor engineering and bridge engineering in high earthquake intensity areas due to the advantages of enough bearing capacity, relatively simple pile sinking process, small soil discharge amount, good bending resistance and the like. Particularly, with the increase of steel output in China and the development and development of new steel pipe pile anticorrosion technology and new material, the steel pipe composite pile is increasingly paid attention and widely applied by designers.
The upper end of a steel pile casing of the steel pipe composite pile applied to bridge engineering extends into a bearing platform, and the steel pile casing and the bearing platform are required to be anchored reliably, so that the steel pile casing can effectively bear load and can work together with core concrete under the action of force. At present, the commonly used anchoring mode between the steel casing and the bearing platform is to cut the part of the steel casing extending into the bearing platform into a strip shape to form a steel strip, and weld a reinforcing steel bar on the steel strip. And the bearing platform stressed steel bars penetrate through the cut steel pile casings.
However, the above anchoring method has the following disadvantages: the position of the steel belt and the position of the bearing platform steel bar still have more conflicts, the arrangement of the horizontal steel bar in the bearing platform can be blocked, and the implementation of the bearing platform steel bar is difficult. The existing method for solving the problem is to cut off the steel strips blocking the arrangement of the steel bars, and the number of the cut steel strips is large, so that the steel casing is difficult to fully play the role. In addition, the part of the steel casing extending into the bearing platform is cut into strips and cut off, so that the construction amount is large, the construction efficiency is low, and the construction period is prolonged.
Disclosure of Invention
The invention aims to provide the PBL shear key connection structure of the steel pipe composite pile and the bearing platform, which has the advantages of simple structure, convenience in construction, high construction efficiency and reliability in connection and is beneficial to fully playing the role of the steel casing.
The second purpose of the invention is to provide a construction method of the PBL shear key connection structure of the steel pipe composite pile and the bearing platform.
The first object of the invention is achieved by the following technical measures: the utility model provides a PBL shear force key-type connection structure of steel pipe composite pile and cushion cap, includes steel pile casing, concrete pile, cushion cap and is located the back cover of cushion cap bottom, the concrete pile is located constitute steel pipe composite pile in the steel pile casing, the steel pile casing upwards passes the back cover and stretches into in the cushion cap, establish the atress reinforcing bar in the cushion cap, for cushion cap atress reinforcing bar, its characterized in that: holes corresponding to bearing platform stress steel bars are formed in the wall of the steel casing extending into the bearing platform, and the bearing platform stress steel bars penetrate through the corresponding holes to form a PBL shear key connection structure.
The invention adopts the technical scheme that holes are formed in the part of the steel casing extending into the bearing platform, the bearing platform stress steel bars penetrate through the holes to form a PBL shear key connection structure, the steel casing also serves as a construction casing, after construction is completed, the steel casing serves as a permanent structure to participate in stress, the effect of the steel casing is favorably and fully exerted, and the problem that in the prior art, a large amount of steel strips are cut off due to the difficulty in implementing the bearing platform steel bars, so that the steel casing is difficult to fully exert the effect is solved. The steel casing and the concrete are stressed cooperatively to resist horizontal and vertical loads together, and the steel casing is particularly suitable for structures in high seismic intensity areas, structures under strong scouring and deep water structures. In addition, the invention has simple structure, reliable connection and convenient implementation, and can greatly improve the construction efficiency.
The force transmission path of the invention is as follows: the superstructure transmits the power to the cushion cap, and partly transmits to the pile foundation through inside concrete of cushion cap and reinforcing bar, and another part protects a frictional force of section of thick bamboo, concrete and steel through PBL shear force key connection structure, concrete and steel and protects the direct pressure transmission at a section of thick bamboo top to the steel and protects a section of thick bamboo. In the PBL shear force key connection structure, a bearing platform penetrating through a steel casing hole bears a stress steel bar and concrete under a shear force, the edge of the steel casing hole bears pressure locally, and a force transmission path is clear.
As an embodiment of the invention, the PBL shear key connection structure of the steel pipe composite pile and the bearing platform further comprises a plurality of shear rings, each shear ring is composed of a pair of arc rings located on the same horizontal plane, and each pair of arc rings is welded on the inner wall of the steel casing close to the pile top to ensure that the steel casing is tightly embedded with concrete.
The shear ring is arranged in a section close to the pile top and bears a large bending moment. The steel pipe composite pile is arranged in a river bed, the pile top is located in a water body, and the shear ring is located in the area from the pile top to the river bed and from the river bed to 3-5 times of the pile diameter.
In a preferred embodiment of the present invention, the distance between adjacent shear rings is 1m to 2 times of the pile diameter, and the distance gradually decreases from bottom to top.
As a preferred embodiment of the invention, the aperture of the hole in the steel casing is 50-70 mm.
The depth of the steel casing extending into the bearing platform is 500-800 mm.
The diameter of the bearing platform stressed steel bar is 32-40 mm.
The second object of the invention is achieved by the following technical measures: a construction method of the PBL shear key connection structure of the steel pipe composite pile and the bearing platform is characterized by comprising the following steps:
the method comprises the steps of measuring a paying-off pile positioning position, erecting a pile foundation construction platform, burying a steel pile casing to a design position, or burying the steel pile casing to the design position first, erecting the pile foundation construction platform, and forming holes;
hoisting the reinforcement cage, putting the reinforcement cage into the hole, and pouring concrete into the hole;
constructing a steel cofferdam at the periphery of the steel pile casing for bottom sealing construction;
pumping water after the back cover construction is finished, positioning the position of the hole in the steel casing according to the position of the bearing platform stressed steel bar after the water is drained, and opening the hole;
⑸, laying bearing platform stressed steel bars, and enabling the bearing platform stressed steel bars corresponding to the holes to penetrate through the holes of the steel casing;
sixthly, sequentially pouring bearing platform concrete in a layered mode.
Compared with the prior art, the invention has the following remarkable effects:
the PBL shear key connection structure is characterized in that a part, extending into a bearing platform, of a steel protection cylinder is provided with a hole, bearing platform stress steel bars penetrate through the hole to form the PBL shear key connection structure, the steel protection cylinder also serves as a protection cylinder for construction, after the construction is completed, the steel protection cylinder serves as a permanent structure and participates in stress, the effect of the steel protection cylinder is favorably and fully exerted, and the problem that in the prior art, a large number of steel strips are cut off due to the difficulty in implementation of the bearing platform steel bars, and the effect of the steel protection cylinder is difficult to fully exert is solved.
the steel pile casing is also used as a construction pile casing, after the concrete construction of the pile body and the bottom sealing construction of the bearing platform are completed, holes are formed in the steel pile casing, then bearing platform stress steel bars penetrate through the steel pile casing, and the steel pile casing is used as a permanent structure and participates in stress.
the invention has simple structure, reliable connection and convenient implementation, and can greatly improve the construction efficiency and shorten the construction period.
the invention is suitable for bridge pile foundations, and is particularly suitable for structures in high earthquake intensity areas, structures under strong scouring and deep water structures.
Drawings
The invention is described in further detail below with reference to the figures and the specific embodiments.
FIG. 1 is an elevational view of the present invention;
3 FIG. 32 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 3 1 3; 3
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a cross-sectional view taken along line C-C of FIG. 3;
fig. 5 is a partially enlarged schematic view of D in fig. 1.
Detailed Description
As shown in fig. 1 to 5, the PBL shear key connection structure of a steel pipe composite pile and a bearing platform of the invention comprises a steel casing 1, a concrete pile 2, a bearing platform 3, a back cover 4 at the bottom of the bearing platform 3 and a plurality of shear rings 8, wherein the concrete pile 2 is positioned in the steel casing 1 to form the steel pipe composite pile 5, the steel casing 1 upwards penetrates through the back cover 4 and extends into the bearing platform 3, a stressed steel bar is arranged in the bearing platform 3 and is a bearing platform stressed steel bar 6, the bearing platform stressed steel bar 6 is a steel bar in two main stress directions, the diameter of the bearing platform stressed steel bar 6 is 32 to 40mm, the depth of the steel casing 1 extending into the bearing platform 3 is 500 to 800mm, a hole 7 corresponding to the bearing platform stressed steel bar 6 is formed in the cylinder wall of the part of the steel casing 1 extending into the bearing platform 3, the hole 7 is 50 to 70mm, and the bearing platform stressed steel bar 6 penetrates through the corresponding hole 7 to form the PBL shear key connection structure.
Each shear ring 8 consists of a pair of arc rings positioned on the same horizontal plane, and each pair of arc rings is welded on the inner wall of the steel casing 1 close to the pile top so as to ensure that the steel casing is tightly embedded with concrete. The shear ring 8 is arranged in an area which is close to a section of the pile top and bears a large bending moment, the steel pipe composite pile 5 is arranged in a river bed, the pile top is located in water, and the shear ring is arranged in an area from the pile top to the river bed and from the river bed to 3-5 times of the pile diameter. The distance between adjacent shear rings 8 is 1m to 2 times of the pile diameter, and the distance is gradually reduced from bottom to top.
The force transmission path of the invention is as follows: the superstructure transmits the power to the cushion cap, and partly transmits to the pile foundation through inside concrete of cushion cap and reinforcing bar, and another part protects a frictional force of section of thick bamboo, concrete and steel through PBL shear force key connection structure, concrete and steel and protects the direct pressure transmission at a section of thick bamboo top to the steel and protects a section of thick bamboo. In the PBL shear force key connection structure, a bearing platform passing through a steel casing hole bears the stress of steel bars and concrete, and the edge of the steel casing hole bears pressure locally.
The steel pile casing is also used as a construction pile casing, after the construction of pile body concrete and the construction of the bottom sealing part of the bearing platform are completed, holes are formed in the pile body concrete, then the pile body concrete penetrates through bearing platform stressed steel bars, and the steel pile casing is used as a permanent structure and participates in stress.
The construction method of the PBL shear key connection structure of the steel pipe composite pile and the bearing platform comprises the following steps:
the method comprises the steps of measuring a paying-off pile positioning position, erecting a pile foundation construction platform, burying a steel protection cylinder 1 to a design position, or burying the steel protection cylinder 1 to the design position firstly and then erecting the pile foundation construction platform, wherein the steel protection cylinder 1 is driven into or sunk into in a static pressure manner, and a rotary drilling machine or a punching drilling machine is adopted for forming holes;
hoisting a reinforcement cage, putting the reinforcement cage into the hole, and pouring concrete into the hole to form a concrete pile 2;
constructing a steel cofferdam at the periphery of the steel pile casing 1, performing bottom sealing 4 construction, and pumping water;
fourthly, positioning the position of a hole 7 in the steel casing 1 according to the position of the bearing platform stress steel bar 6, and opening the hole;
⑸, laying bearing platform stressed steel bars 6, and enabling the bearing platform stressed steel bars 6 corresponding to the holes 7 to penetrate through the holes 7 of the steel casing 1;
sixthly, sequentially pouring bearing platform concrete in a layered mode.
The embodiments of the present invention are not limited thereto, and according to the above-mentioned contents of the present invention, the present invention can be modified, substituted or changed in other various forms without departing from the basic technical idea of the present invention.
Claims (5)
1. A construction method of a PBL shear key connection structure of a steel pipe composite pile and a bearing platform comprises a steel pile casing, a concrete pile, the bearing platform and a back cover positioned at the bottom of the bearing platform, wherein the concrete pile is positioned in the steel pile casing to form the steel pipe composite pile, the steel pile casing upwards penetrates through the back cover and extends into the bearing platform, a stressed steel bar is arranged in the bearing platform and is a bearing platform stressed steel bar, holes corresponding to the bearing platform stressed steel bar are formed in the wall of the part, extending into the bearing platform, of the steel pile casing, the bearing platform stressed steel bar penetrates through the corresponding holes to form the PBL shear key connection structure, so that the steel pile casing is also used as a construction pile casing, and after construction is finished, the steel pile casing is used as a permanent structure; the PBL shear key connection structure of the steel pipe composite pile and the bearing platform further comprises a plurality of shear rings, each shear ring consists of a pair of arc rings in the same horizontal plane, and each pair of arc rings is welded on the inner wall of the steel casing close to the pile top so as to ensure that the steel casing is tightly embedded and fixed with concrete; the distance between adjacent shear rings is 1-2 times of the pile diameter, and the distance is gradually reduced from bottom to top;
the construction method is characterized by comprising the following steps:
the method comprises the steps of measuring a paying-off pile positioning position, erecting a pile foundation construction platform, burying a steel pile casing to a design position, or burying the steel pile casing to the design position first, erecting the pile foundation construction platform, and forming holes;
hoisting the reinforcement cage, putting the reinforcement cage into the hole, and pouring concrete into the hole;
constructing a steel cofferdam at the periphery of the steel pile casing for bottom sealing construction;
pumping water after the back cover construction is finished, positioning the position of the hole in the steel casing according to the position of the bearing platform stressed steel bar after the water is drained, and opening the hole;
⑸, laying bearing platform stressed steel bars, and enabling the bearing platform stressed steel bars corresponding to the holes to penetrate through the holes of the steel casing;
sixthly, sequentially pouring bearing platform concrete in a layered mode.
2. The construction method of the PBL shear key connection structure of the steel pipe composite pile and the bearing platform according to claim 1, characterized in that: the steel pipe composite pile is arranged in a river bed, the pile top is located in a water body, and the shear ring is located in the area from the pile top to the river bed and from the river bed to 3-5 times of the pile diameter.
3. The construction method of the PBL shear key connection structure of the steel pipe composite pile and the bearing platform according to claim 2, characterized in that: the aperture of the hole in the steel casing is 50-70 mm.
4. The construction method of the PBL shear key connection structure of the steel pipe composite pile and the bearing platform according to claim 3, characterized in that: the depth of the steel casing extending into the bearing platform is 500-800 mm.
5. The construction method of the PBL shear key connection structure of the steel pipe composite pile and the bearing platform according to claim 4, characterized in that: the diameter of the bearing platform stressed steel bar is 32-40 mm.
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| CN201711030040.0A CN107964975B (en) | 2017-10-27 | 2017-10-27 | Construction method of PBL (Poly-p-phenylene benzobisoxazole) shear force key connection structure of steel pipe composite pile and bearing platform |
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| CN201711030040.0A CN107964975B (en) | 2017-10-27 | 2017-10-27 | Construction method of PBL (Poly-p-phenylene benzobisoxazole) shear force key connection structure of steel pipe composite pile and bearing platform |
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| CN107964975B true CN107964975B (en) | 2020-05-19 |
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| CN110847022A (en) * | 2019-12-19 | 2020-02-28 | 浙江省交通规划设计研究院有限公司 | Multi-support steel pipe concrete single-column pier with concrete cover beam |
| CN113356029A (en) * | 2021-06-22 | 2021-09-07 | 天津市政工程设计研究总院有限公司 | Bridge shock-absorbing structure suitable for pile group foundation |
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| CN206521764U (en) * | 2016-10-25 | 2017-09-26 | 大唐华银（湖南）新能源有限公司 | Foundation ring of wind generating set |
| CN206503079U (en) * | 2017-01-25 | 2017-09-19 | 上海市政工程设计研究总院（集团）有限公司 | A kind of packaged type bridges substructure |
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Address after: No.146, huangbian North Road, Baiyun District, Guangzhou, Guangdong 510440 Patentee after: Guangdong transportation planning and Design Institute Group Co., Ltd Address before: No.22 Xinghua Road, Tianhe District, Guangzhou City, Guangdong Province Patentee before: Guangdong transportation planning and Design Institute Co., Ltd |