CN109881662B - Large-diameter high-performance UHPC-steel pipe composite pile foundation and construction method thereof - Google Patents
Large-diameter high-performance UHPC-steel pipe composite pile foundation and construction method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 102
- 239000010959 steel Substances 0.000 title claims abstract description 102
- 239000002131 composite material Substances 0.000 title claims abstract description 59
- 238000010276 construction Methods 0.000 title claims abstract description 26
- 238000011010 flushing procedure Methods 0.000 claims abstract description 5
- 238000007667 floating Methods 0.000 claims description 130
- 239000011374 ultra-high-performance concrete Substances 0.000 claims description 71
- 239000004567 concrete Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000005553 drilling Methods 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 241001330002 Bambuseae Species 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
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Abstract
The invention discloses a large-diameter high-performance UHPC-steel pipe composite pile foundation, which comprises the following components: the UHPC-RC composite pile, the steel pipe composite pile and the joint are connected, and the joint is positioned below the lowest flushing line; the invention also discloses a construction method of the large-diameter high-performance UHPC-steel pipe composite pile foundation. Compared with the traditional pile foundation, the composite pile foundation disclosed by the invention not only can accelerate the construction speed, but also has better economy, bearing capacity and durability.
Description
Technical Field
The invention relates to a pile foundation structure form in the field of civil engineering, in particular to a construction technology of a large-diameter pile foundation in a cross-sea bridge and wind power engineering under a marine corrosion environment. More specifically, the invention relates to a large-diameter high-performance UHPC-steel pipe composite pile foundation and a construction method thereof.
Background
At present, the development of ocean resources in China is more and more strong, the growth of engineering construction projects such as cross-sea bridges, wind power and the like is considerable, and the construction of a foundation structure is a serious difficulty of engineering project construction due to the high-wave and strong-corrosiveness ocean environment.
For the construction of structure foundation under marine environment, mainly adopt drilling bored concrete pile and major diameter steel-pipe pile at present, traditional drilling bored concrete pile efficiency of construction is low, and major diameter steel-pipe pile is although having improved the efficiency of construction, and the cost is high, and need carry out long-term corrosion-resistant protection, and the economic nature is not good.
Disclosure of Invention
The invention aims to provide a large-diameter high-performance UHPC-steel pipe composite pile foundation and a construction method thereof, which can not only accelerate the construction speed, but also have better economy, bearing capacity and durability compared with the traditional pile foundation.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a large diameter high performance UHPC-steel pipe composite pile foundation comprising: the UHPC-RC composite pile is connected with the steel pipe composite pile by the joint, and the joint is positioned below the lowest flushing line.
Preferably, the UHPC-RC composite pile comprises an outer UHPC pile casing and inner cast-in-place concrete; the steel pipe composite pile comprises an outer steel pipe pile and inner cast-in-place concrete.
Preferably, the diameter of the composite pile foundation is greater than 2 meters.
Preferably, the wall thickness of the UHPC casing is 5-12 cm, and the wall thickness of the steel pipe pile is 1.5-3 cm.
Preferably, the inner wall of the UHPC casing comprises annular concave-convex grooves so as to form shear key teeth.
Preferably, the joint is an annular steel plate which is pre-buried in the UHPC pile casing, and the bottom of the steel plate and the upper end of the steel pipe pile are welded into a whole.
Preferably, the part of the steel plate pre-buried in the UHPC protective cylinder comprises an annular inner steel plate at the inner side and an annular outer steel plate at the outer side, a plurality of deformed bars are arranged between the outer wall of the inner steel plate and the inner wall of the outer steel plate in a staggered manner in the circumferential direction and the longitudinal direction, and a plurality of deformed bars are also arranged on the inner wall of the inner steel plate and the outer wall of the outer steel plate in the circumferential direction and the longitudinal direction outwards.
Preferably, the UHPC casing is further provided with an anti-collision structure at the sea surface, which includes:
the embedded pile casing is overlapped with the central axis of the UHPC pile casing and is tightly attached to the outer side wall of the UHPC pile casing, and the embedded pile casing and the UHPC pile casing are integrally molded and poured;
the embedded parts are a plurality of embedded parts and are embedded in the embedded protection cylinder, the embedded parts are uniformly arranged at intervals along the same circumference of the embedded protection cylinder, the embedded parts are also arranged along the same longitudinal direction of the embedded protection cylinder, and each embedded part is connected with a connecting rope extending out of the embedded protection cylinder;
the first floating columns are multiple and are bound to be clung to the embedded protective cylinder through connecting ropes on the same longitudinal embedded parts, the connecting ropes for binding the first floating columns are also fixedly binding the second floating columns, and the multiple second floating columns are uniformly arranged at intervals in the same circumference and are all arranged on the outer sides of the first floating columns;
the third floating columns are tightly attached to the embedded pile casings, one third floating column is arranged between every two adjacent first floating columns, the third floating columns and the first floating columns are bound into a whole through binding ropes, the third floating columns are tightly attached to the first floating columns, the upper surfaces of the third floating columns are downwards sunken to form concave cavities, fifth floating columns are matched in the concave cavities, and the upper ends of the fifth floating columns protrude out of the upper surfaces of the third floating columns;
the fourth floating columns are arranged between every two adjacent second floating columns, the fourth floating columns and the second floating columns are bound into a whole through binding ropes, the fourth floating columns are mutually clung to the second floating columns, and a plurality of through holes are formed in the fourth floating columns;
the connecting floating columns are connected with the third floating column and the fourth floating column and are longitudinally provided with a plurality of through water flow channels, one ends of the water flow channels penetrate through concave cavities of the third floating column, and the other ends of the water flow channels penetrate through holes in the fourth floating column.
Preferably, the first, third, fourth and fifth floating columns are arc-shaped, and the lower end of the fifth floating column is connected with the bottom of the concave cavity through a rope so that the lower end of the fifth floating column does not protrude out of the third floating column.
The invention also provides a construction method of the large-diameter high-performance UHPC-steel pipe composite pile foundation, which comprises the following steps:
s1: prefabricating the UHPC pile casing and the steel pipe pile in a factory, and connecting the UHPC pile casing and the steel pipe pile into an integrated structure through a joint;
s2: the UHPC pile casing and the steel pipe pile which are connected are transported to the vicinity of the pile position, and hoisting, positioning and hammering sinking are carried out;
s3: sinking the pile to a specified elevation, drilling holes, removing slag, lowering a reinforcement cage and pouring internal core concrete;
s4: and (5) completing the construction of the composite pile.
The invention at least comprises the following beneficial effects:
1. the composite pile foundation is particularly suitable for foundation engineering construction of cross-sea bridges and wind power engineering under marine environments with complex loading conditions and strong corrosiveness, not only can the construction speed be accelerated, but also the composite pile foundation has better economy, bearing capacity and durability.
2. The diameter coverage area of the composite pile foundation is wide, and can reach 3 meters or even 4 meters.
3. The composite pile foundation provided by the invention can fully play the advantages of the UHPC pile casing and the steel pipe pile, and improves the construction efficiency of the cast-in-place pile and the economy of the steel pipe pile.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural view of a composite pile foundation of the present invention;
FIG. 2 is a schematic view of the structure of the composite pile foundation of the present invention without concrete casting;
FIG. 3 is a partial cross-sectional view of a joint of the present invention;
FIG. 4 is a top view of the crash structure of the invention;
fig. 5 is a schematic diagram of a connection structure of a third floating column and a fourth floating column according to the present invention.
Reference numerals illustrate:
1. UHPC-RC composite pile, 2, steel pipe composite pile, 3, joint, 4, cast-in-place concrete, 5, UHPC pile casing, 6, steel pipe pile, 7, bearing platform, 8, screw reinforcement, 9, pre-buried pile casing, 10, connecting rope, 11, first floating columns, 12, second floating columns, 13, third floating columns, 14, fourth floating columns, 15, fifth floating columns, 16, connecting floating columns, 17, through holes, 18 and concave cavities.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention.
As shown in fig. 1 to 2, the present invention provides a large-diameter high-performance UHPC-steel pipe composite pile foundation comprising: the UHPC-RC composite pile comprises a UHPC-RC composite pile 1, a steel pipe composite pile 2 and a joint 3, wherein the joint 3 connects the UHPC-RC composite pile 1 and the steel pipe composite pile 2, and the joint 3 is positioned below the lowest flushing line. The UHPC-RC composite pile 1 comprises an outer UHPC pile casing 5 and an inner cast-in-place concrete 4; the steel pipe composite pile 2 comprises an outer steel pipe pile 6 and an inner cast-in-place concrete 4.
In the above technical scheme, UHPC protects a section of thick bamboo 5 and steel-pipe pile 6 and can regard as the dado when drilling and inside core cast in situ concrete 4 pour, and UHPC protects a section of thick bamboo 5 and can promote structural durability, reduces steel-pipe pile 6 anticorrosive expense, and steel-pipe pile 6 can improve the pluggable, accelerates the construction progress, ensures construction quality. After the pouring of the inner core cast-in-place concrete 4 is completed, the UHPC pile casing 5 and the steel pipe pile 6 can participate in structural stress, so that the bending resistance and the compression resistance bearing capacity of the composite pile foundation are improved; the UHPC pile casing 5 has good compactness, can be used as a protective layer of the inner core cast-in-place concrete 4, reduces the erosion rate of chloride ions in the core concrete in a water level fluctuation area and a splash area, and improves the durability of a pile foundation structure. In order to ensure the stress performance and durability of the lower-section steel pipe composite pile 2, the joint 3 should be partially arranged below the lowest flushing line, so that the corrosion speed of the steel pipe pile 6 is reduced. The composite pile foundation construction method of the invention is as follows:
1) According to design requirements, determining reasonable diameters and lengths of the UHPC pile casing and the steel pipe pile, and performing factory prefabrication, connection and quality detection;
2) The UHPC pile casing and the steel pipe pile which are connected are transported to the vicinity of the pile position, and hoisting, positioning and hammering sinking are carried out;
3) Sinking the pile to a specified elevation, drilling holes, removing slag, lowering a reinforcement cage and pouring internal core concrete;
4) The construction of the composite pile is completed, a connecting structure with the bearing platform 7 is reserved, namely the upper end of the reinforcement cage which is lowered inside protrudes out of the bearing platform 7, and the reinforcement cage and the bearing platform 7 are connected into a whole.
In another aspect, the diameter of the composite pile foundation is greater than 2 meters. The diameter of the composite pile foundation is at least larger than 2 meters, and the pile foundation with small diameter can be constructed similarly according to actual construction conditions.
In another technical scheme, the wall thickness of the UHPC casing 5 is 5-12 cm, and the wall thickness of the steel pipe pile 6 is 1.5-3 cm.
In the above technical scheme, the wall thickness of the UHPC casing 5 is relatively thicker, generally 5-12 cm, on one hand, the UHPC casing 5 is ensured to bear stronger hammering force when hammering is sinking, in fact, after the wall thickness of the UHPC casing 5 is thicker, the UHPC casing 5 is easier to bear hammering force than the steel pipe pile 6; on the other hand, the UHPC pile casing 5 is ensured not to be damaged and cracked during manufacturing, transportation and hammering, and the steel pipe pile 6 is set to be of conventional wall thickness, namely 1.5-3 cm.
In another technical scheme, the inner wall of the UHPC pile casing 5 comprises annular concave-convex grooves so as to form shear key teeth and enhance the stress performance of the UHPC-RC composite pile.
In the technical scheme, the interface combination of the UHPC pile casing 5 and the common cast-in-place concrete 4 is better than the combination of the traditional steel pipe pile 6 and the cast-in-place concrete 4, and the degree of common stress is also better; the steel pipe pile 6 is welded with annular steel bars and the like on the inner wall of the steel pipe pile to form a similar connecting piece, concrete is poured, and the steel pipe pile 6 and the cast-in-place concrete 4 are combined to form the steel pipe composite pile 2, but slippage of the cast-in-place concrete 4 is easy to occur; the concave-convex shear key teeth are formed on the inner wall of the UHPC pile casing 5, and the UHPC pile casing 5 and the cast-in-place concrete 4 are combined and basically do not slide, so that the combining force of the UHPC pile casing 5 and the cast-in-place concrete 4 is greatly increased, and the bearing performance of the composite pile foundation is enhanced.
In another technical scheme, the joint 3 is an annular steel plate which is pre-buried in the UHPC pile casing 5, and the bottom of the steel plate and the upper end of the steel pipe pile 6 are welded into a whole.
In the above technical scheme, when the UHPC casing 5 is prefabricated in a factory, the upper part of the joint 3 is poured into the UHPC casing 5 together, so that the upper part of the joint 3 and the UHPC casing 5 are of an integral fixing structure, then the lower part of the joint 3 protruding out of the UHPC casing 5 is welded with the steel pipe pile 6, so that the UHPC casing 5 and the steel pipe pile 6 are connected through the joint 3, after the UHPC casing 5 and the steel pipe pile 6 are connected, the outer side walls of the UHPC casing 5 are overlapped, and concrete is poured inside.
In another technical scheme, the part of the steel plate pre-buried in the UHPC casing 5 comprises an annular inner steel plate at the inner side and an annular outer steel plate at the outer side, a plurality of deformed bars 8 are arranged between the outer wall of the inner steel plate and the inner wall of the outer steel plate in a staggered manner in the circumferential direction and the longitudinal direction, and a plurality of deformed bars 8 are also arranged on the inner wall of the inner steel plate and the outer wall of the outer steel plate in the circumferential direction and the longitudinal direction outwards.
In the above technical scheme, the joint 3 is a steel plate, which is connected with the UHPC casing 5 and the steel pipe pile 6, and the steel plate is pre-buried in the UHPC casing 5, so that the connection stability of the UHPC casing 5 and the steel pipe pile 6 is ensured, and the firmness of the steel plate pre-buried in the UHPC casing 5 is very important. The steel plate part pre-buried in the UHPC pile casing 5 is divided into two layers, is the annular setting of inside and outside, is provided with the twisted steel 8 between two layers, and the outside of two layers also is provided with the twisted steel 8, sets up the twisted steel 8 simultaneously through setting up two layers of structures and makes the UHPC pile casing 5 when pouring, and the cohesion between concrete and the steel plate is more excellent than ordinary one deck steel plate cohesion, has guaranteed the fastness that connects 3 and UHPC pile casing 5 combine to a great extent.
In another technical solution, the UHPC casing 5 is further provided with an anti-collision structure at the sea surface, which includes:
the embedded protection cylinder 9 is overlapped with the central axis of the UHPC protection cylinder 5 and is tightly attached to the outer side wall of the UHPC protection cylinder 5, and the embedded protection cylinder 9 and the UHPC protection cylinder 5 are integrally molded and poured;
the embedded parts are a plurality of embedded parts and are embedded in the embedded pile casing 9, the embedded parts are uniformly arranged at intervals along the same circumferential direction of the embedded pile casing 9, the embedded parts are also arranged along the same longitudinal direction of the embedded pile casing 9, and each embedded part is connected with a connecting rope 10 extending out of the embedded pile casing 9;
the first floating columns 11 are multiple and are bound to be clung to the embedded protective cylinder 9 through connecting ropes 10 on the same longitudinal embedded parts, the connecting ropes 10 for binding the first floating columns 11 are also fixedly bound with second floating columns 12, and the second floating columns 12 are uniformly arranged at intervals in the same circumference and are all arranged at the outer side of the first floating columns 11;
the third floating columns 13 are tightly attached to the pre-buried pile casings 9, one third floating column 13 is arranged between every two adjacent first floating columns 11, the third floating columns 13 and the first floating columns 11 are bound into a whole through binding ropes, the third floating columns 13 are tightly attached to the first floating columns 11, the upper surfaces of the third floating columns 13 are downwards recessed to form concave cavities 18, fifth floating columns 15 are matched in the concave cavities, and the upper ends of the fifth floating columns 15 are protruded out of the upper surfaces of the third floating columns 13;
the fourth floating columns 14 are arranged between every two adjacent second floating columns 12, the fourth floating columns 14 and the second floating columns 12 are bound into a whole through binding ropes, the fourth floating columns 14 are mutually clung to the second floating columns 12, and a plurality of through holes 17 are formed in the fourth floating columns 14;
the connecting floating columns 16 are connected with the third floating column 13 and the fourth floating column 14 and are longitudinally provided in plurality, and the connecting floating columns 16 are provided with through water flow channels, one ends of the water flow channels penetrate through a concave cavity 18 of the third floating column 13, and the other ends of the water flow channels penetrate through holes 17 on the fourth floating column.
In the above technical scheme, the pile foundation is formed by connecting two composite piles through the joint, and if the pile foundation collides with the impact of a ship or the like on the sea surface, the stability in the pile foundation construction process can be influenced, so that the anti-collision structure is arranged at the sea surface on the outer side of the UHPC pile casing 5, and the larger direct impact force of the ship or the like on the UHPC pile casing 5 can be reduced to a certain extent. The embedded pile casing 9 is arranged on the outer side of the UHPC pile casing 5, the embedded pile casing 9 and the embedded pile casing 5 are integrally poured when being prefabricated in a factory, after pile sinking, the embedded pile casing 9 is partially arranged under the sea surface and partially arranged on the sea surface, when being prefabricated in the factory, a plurality of embedded parts are embedded in the embedded pile casing 9 in advance, and connecting ropes 10 on the embedded parts extend out of the embedded pile casing 9, so that the floating columns can be conveniently bound in the later stage, and the embedded pile casing 9 and the embedded parts are arranged to enable the later stage to be free of separate connecting structures or be used for connecting the floating columns by drilling holes in the outer side wall of the UHPC pile casing 5. The first floating columns 11 and the third floating columns 13 are tightly attached to the embedded protection barrel 9 and are of an anti-collision inner side structure, the second floating columns 12 and the fourth floating columns 14 are located on the outer side of the embedded protection barrel 9 and are of a certain interval with the embedded protection barrel 9 and are of an anti-collision outer side structure, an anti-collision effect of the first layer is achieved, the third floating columns 13 are connected through the first floating columns 11, the fourth floating columns 14 are connected through the second floating columns 12, and therefore the number of embedded parts is reduced, and the stability and the firmness of the structure of the embedded protection barrel 9 are guaranteed. The heights of the first floating column 11, the second floating column 12, the third floating column 13 and the fourth floating column 14 are not greatly different, the floating sea waves vertically float on the sea surface, under the condition of ship collision, the lifted huge sea waves possibly directly cross the outer floating columns to enter the inner side, then impact the outer side wall of the UHPC pile casing 5, impact the UHPC pile casing 5 to a certain extent, and in addition, the outer floating columns and the inner floating columns possibly sink, so that a fifth floating column 15 is arranged, a connecting floating column 16 arranged below the sea surface enables water flow to enter a concave cavity 18, the fifth floating column 15 is in a floating state, and the height of the inner floating column can be increased to a certain extent; the connecting floating columns 16 arranged above the sea surface can quickly guide part of sea wave water flow into the concave cavities 18 when the ship and the like collide, so that the fifth floating columns 15 further float upwards, and the inner floating columns can resist the direct collision of the ship to a certain extent.
In another technical scheme, the first floating post 11, the third floating post 13, the fourth floating post 14 and the fifth floating post 15 are all arc-shaped, and the arc shapes can enable the mutual fit and the fit with the pre-buried pile casing 9 to be better, so that the anti-collision is more facilitated; the lower end of the fifth floating column 15 is connected with the bottom of the concave cavity 18 through a rope so that the lower end of the fifth floating column 15 does not protrude out of the third floating column 13.
The comparison between the aspects of the composite pile foundation and the conventional pile foundation is shown in the following table:
in the table, the stress performance and the material cost are calculated on the premise:
(1) The outer diameter of the single pile foundation is 1.6m, the length is 60m, the water depth above the mud surface is 30m, and the single pile foundation is put into a bearing layer for 30m;
(2) The temporary steel pile casing of the cast-in-place pile is 1.6cm thick, the steel pipe of the composite pile is 3cm thick, and the UHPC pipe pile is 11cm thick;
(3) The cast-in-place pile concrete and the core concrete are C30.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (8)
1. The UHPC-steel pipe composite pile foundation is characterized by comprising: the UHPC-RC composite pile, the steel pipe composite pile and the joint are connected, and the joint is positioned below the lowest flushing line;
the UHPC-RC composite pile comprises an outer UHPC pile casing and inner cast-in-place concrete; the steel pipe composite pile comprises an outer steel pipe pile and inner cast-in-place concrete;
the UHPC protects a section of thick bamboo and is located sea department still to be provided with crashproof structure, and it includes:
the embedded pile casing is overlapped with the central axis of the UHPC pile casing and is tightly attached to the outer side wall of the UHPC pile casing, and the embedded pile casing and the UHPC pile casing are integrally molded and poured;
the embedded parts are a plurality of embedded parts and are embedded in the embedded protection cylinder, the embedded parts are uniformly arranged at intervals along the same circumference of the embedded protection cylinder, the embedded parts are also arranged along the same longitudinal direction of the embedded protection cylinder, and each embedded part is connected with a connecting rope extending out of the embedded protection cylinder;
the first floating columns are multiple and are bound to be clung to the embedded protective cylinder through connecting ropes on the same longitudinal embedded parts, the connecting ropes for binding the first floating columns are also fixedly binding the second floating columns, and the multiple second floating columns are uniformly arranged at intervals in the same circumference and are all arranged on the outer sides of the first floating columns;
the third floating columns are tightly attached to the embedded pile casings, one third floating column is arranged between every two adjacent first floating columns, the third floating columns and the first floating columns are bound into a whole through binding ropes, the third floating columns are tightly attached to the first floating columns, the upper surfaces of the third floating columns are downwards sunken to form concave cavities, fifth floating columns are matched in the concave cavities, and the upper ends of the fifth floating columns protrude out of the upper surfaces of the third floating columns;
the fourth floating columns are arranged between every two adjacent second floating columns, the fourth floating columns and the second floating columns are bound into a whole through binding ropes, the fourth floating columns are mutually clung to the second floating columns, and a plurality of through holes are formed in the fourth floating columns;
the connecting floating columns are connected with the third floating column and the fourth floating column and are longitudinally provided with a plurality of through water flow channels, one ends of the water flow channels penetrate through concave cavities of the third floating column, and the other ends of the water flow channels penetrate through holes in the fourth floating column.
2. The large diameter high performance UHPC-steel pipe composite pile foundation of claim 1 wherein the diameter of the composite pile foundation is greater than 2 meters.
3. The large diameter high performance UHPC-steel pipe composite pile foundation of claim 1 wherein the wall thickness of the UHPC casing is 5-12 cm and the wall thickness of the steel pipe pile is 1.5-3 cm.
4. The large diameter high performance UHPC-steel pipe composite pile foundation of claim 1 wherein the inner wall of the UHPC casing comprises circumferential grooves and recesses to form shear key teeth.
5. The large diameter high performance UHPC-steel pipe composite pile foundation of claim 1 wherein the joint is an annular steel plate pre-embedded in the UHPC casing, the bottom of the steel plate being welded integrally with the upper end of the steel pipe pile.
6. The large-diameter high-performance UHPC-steel pipe composite pile foundation of claim 5, wherein the part of the steel plate pre-buried in the UHPC pile casing comprises an annular inner steel plate on the inner side and an annular outer steel plate on the outer side, a plurality of screw-thread steel bars are arranged between the outer wall of the inner steel plate and the inner wall of the outer steel plate in a staggered manner in the circumferential direction and the longitudinal direction, and a plurality of screw-thread steel bars are arranged on the inner wall of the inner steel plate and the outer wall of the outer steel plate in the circumferential direction and the longitudinal direction outwards.
7. The large diameter high performance UHPC-steel tube composite pile foundation of claim 1 wherein the first, third, fourth and fifth pontoons are each arcuate, the lower end of the fifth pontoon being connected to the bottom of the cavity by a rope such that the lower end of the fifth pontoon does not protrude beyond the third pontoon.
8. A method of constructing a large diameter high performance UHPC-steel pipe composite pile foundation according to any one of claims 1 to 7, comprising the steps of:
s1: prefabricating the UHPC pile casing and the steel pipe pile in a factory, and connecting the UHPC pile casing and the steel pipe pile into an integrated structure through a joint;
s2: the UHPC pile casing and the steel pipe pile which are connected are transported to the vicinity of the pile position, and hoisting, positioning and hammering sinking are carried out;
s3: sinking the pile to a specified elevation, drilling holes, removing slag, lowering a reinforcement cage and pouring internal core concrete;
s4: and (5) completing the construction of the composite pile.
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| CN201910127457.1A CN109881662B (en) | 2019-02-20 | 2019-02-20 | Large-diameter high-performance UHPC-steel pipe composite pile foundation and construction method thereof |
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Citations (6)
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| CN206646456U (en) * | 2017-03-29 | 2017-11-17 | 重庆大丰交通设施制造有限公司 | Bridge rotates floating anticollision device, collision-prevention device |
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| US20110274502A1 (en) * | 2010-05-06 | 2011-11-10 | George Tibedo | Dampening Pile Guide |
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| CN202519664U (en) * | 2012-03-21 | 2012-11-07 | 河南理工大学 | High tensile reinforcement reinforced prestressed UHPC (Ultra High Performance Concrete) thin-wall tubular pile component |
| CN102839660A (en) * | 2012-09-18 | 2012-12-26 | 天津港建设公司 | Composite pile of long piled wharf PHC (prestressed high-strength concrete) pile and steel pipe pile |
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| CN109881662A (en) | 2019-06-14 |
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