CN111236291A - Anti-scouring NACA type water injection device for serial pier foundation and construction method thereof - Google Patents
Anti-scouring NACA type water injection device for serial pier foundation and construction method thereof Download PDFInfo
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- CN111236291A CN111236291A CN202010067534.1A CN202010067534A CN111236291A CN 111236291 A CN111236291 A CN 111236291A CN 202010067534 A CN202010067534 A CN 202010067534A CN 111236291 A CN111236291 A CN 111236291A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/52—Submerged foundations, i.e. submerged in open water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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Abstract
The invention discloses an anti-scouring NACA type water injection device for a serial pier pile foundation and a construction method thereof, and relates to the technical field of bridge pile foundation reinforcement. The utility model provides a be used for serial pile foundation scour protection NACA type water injection facility of pier, includes NACA airfoil shaped structure and a plurality of spud pile, and NACA airfoil shaped structure's cross section is the NACA airfoil. The NACA airfoil structure is provided with a pile foundation through hole with a section being an NACA airfoil, and the NACA airfoil structure is sleeved on the outer surface of a tandem pile foundation of the bridge pier through the pile foundation through hole and is fixed through a plurality of fixing piles. Because the periphery of the contact part of the pier serial pile foundation and water is wrapped by the NACA airfoil structure, the damage of horseshoe vortices and wake vortices to the serial pile foundation can be effectively inhibited, the pile foundation is prevented from being eroded by water, and the bearing capacity of the serial pile foundation is improved. Meanwhile, the protective device can be suitable for the built and non-built bridge pile foundation and has the characteristics of simple and rapid construction, low cost, safety and environmental protection.
Description
Technical Field
The invention relates to the technical field of bridge pile foundation reinforcement.
Background
In recent years, the economy of China is rapidly developed, and a large number of large bridges spanning the rivers of the great river, such as a Hongzhu Australian bridge, an east-sea bridge, a Hangzhou Bay bridge, a Lijiatuo bridge in Chongqing city, and the like, are built immediately. Most of the bridges across rivers adopt deep water pile group foundations, and the size and the water blocking area are large. The safety and stability of the bridge pile foundation in the complex water flow environment depend on the stress condition of the bridge pile foundation in the complex water area environment, and are also related to the reduction of the bearing capacity of the pile foundation caused by the shallow burying depth of the bridge pile foundation caused by water flow scouring. And a large number of investigation statistical results also show that one of the main causes of bridge damage is caused by the reduction of the embedded depth of the bridge pier due to the local scouring of the bridge pier foundation.
The existence of bridge pile foundation has changed the rivers environment around the pile foundation, and research shows: when a pile-column structure is built in a water flow environment, the flow field around the structure can be obviously changed, a complex and changeable three-dimensional flow state is formed, a descending flow and a horseshoe vortex can be formed in front of a pile, and a wake vortex can be formed behind the pile. The formation and movement of the horseshoe vortex and the wake vortex enhance the transport capacity of the material on the surface of the riverbed, so that an obvious local scouring pit is formed on the bridge pile foundation, the effective embedding depth of the bridge pile foundation in the bottom bed soil body is reduced, the bearing capacity of the pile foundation is reduced, the safety and the stability of the bridge are greatly influenced, in the mountain city, the water flow velocity is larger, and the influence of water flow scouring on the safety and the stability of the bridge is stronger.
Disclosure of Invention
The invention aims to provide an anti-scouring NACA type water injection device for a serial pier foundation and a construction method thereof.
The technical scheme adopted for achieving the purpose of the invention is that the anti-scouring NACA type water injection device for the serial pier foundation comprises an NACA airfoil structure and a plurality of fixing piles, wherein the outer side wall of the NACA airfoil structure is an NACA airfoil curved surface.
The structural pile foundation interlude hole that supplies a plurality of spuds and pile foundation to pass that is provided with of NACA airfoil profile, the pile foundation interlude hole runs through NACA airfoil profile structure's upper and lower face. There is cavity S between the pore wall of pile foundation interlude hole and the surface of NACA airfoil structure, and the upper surface of NACA airfoil structure is provided with a plurality of preformed holes, and grit or concrete mortar pour into cavity S through a plurality of preformed holes in.
The upper surface of NACA airfoil structure flushes with the horizontal plane, and the upper surface contact of lower surface and bed foundation soil layer, a plurality of spuds and a plurality of tandem pile foundation pass the pile foundation poling hole.
The fixed pile comprises a pile body and a pile cap connected to the top of the pile body, and the cross-sectional area of the pile cap is larger than that of the pile body. The pile bodies of the fixing piles are tightly attached to the inner side wall of the NACA airfoil structure, and the lower surface of the pile cap is tightly attached to the upper surface of the NACA airfoil structure. The lower ends of the pile bodies penetrate through the pile foundation through holes and then are anchored in the foundation soil layer at the bottom of the bed.
And the pile foundations at the two most ends of the series are tightly attached to the inner side wall of the NACA airfoil structure.
Furthermore, one or two mortise and tenon structures are arranged on the NACA airfoil structure, and the mortise and tenon structures penetrate through the upper plate surface, the lower plate surface and the cavity S of the NACA airfoil structure. The NACA airfoil structure is located on a chord line of the NACA airfoil structure.
If the structural mortise and tenon structure that is provided with of NACA airfoil, during the installation, untie this mortise and tenon structure, pile foundation interlude hole forms an opening in vertical direction, establishes NACA airfoil structure cover on a plurality of tandem pile foundations through this opening, and straining mortise and tenon structure again.
If two mortise and tenon structures are arranged on the NACA airfoil structure, the two mortise and tenon structures are unfastened during installation, the NACA airfoil structure is divided into two structures with arc grooves in the vertical direction, the two structures with the arc grooves are buckled on the outer surfaces of a plurality of tandem pile foundations, and then the two mortise and tenon structures are fastened.
Further, the NACA airfoil structure is made of a high strength plastic or fibrous material.
Furthermore, the diameter of the pile foundation is d, the minimum distance from the fixed pile to the pile foundation is ad, d is larger than 0, and a is larger than or equal to 1.5 and smaller than or equal to 2.
The construction method for the anti-scouring NACA type water injection device for the serial pier pile foundation comprises the following steps:
1) and manufacturing the NACA airfoil structure and a plurality of fixing piles according to the actual size of the serial pile foundation in the engineering.
2) And (4) unfastening the mortise and tenon structure, sleeving the NACA wing structure on the plurality of tandem pile foundations, and then fastening the mortise and tenon structure. And the pile foundations at two ends are tightly attached to the inner side wall of the NACA airfoil structure.
3) Sand or concrete mortar is injected into the cavity S through the reserved holes, and the NACA wing-shaped structure sinks to the upper surface of the foundation soil layer under the action of gravity.
4) And drilling a plurality of fixing pile holes on the foundation soil layer of the bed bottom according to design requirements, and driving a plurality of fixing piles into the fixing pile holes. The pile body is tightly attached to the inner side wall of the NACA airfoil structure, and the lower surface of the pile cap is tightly attached to the upper surface of the NACA airfoil structure.
The technical effects of the invention are undoubted, the part of the tandem pile foundation exposed in water is wrapped and protected by the NACA airfoil structure, and the fixing pile is adopted for reinforcement, so that the damage of horseshoe vortex and wake vortex to the tandem pile foundation can be effectively inhibited, the pile foundation is ensured not to be eroded by water, and the bearing capacity of the tandem pile foundation is improved. Meanwhile, the protective device can be suitable for the built and non-built bridge pile foundation and has the characteristics of simple and rapid construction, low cost, safety and environmental protection.
Drawings
FIG. 1 is a perspective view of an anti-scour NACA type water injection device and a tandem pile foundation;
FIG. 2 is a front view of an anti-scour NACA type water injection device and a tandem pile foundation;
FIG. 3 is a top view of an anti-scour NACA type water injection apparatus and a tandem pile foundation;
fig. 4 is a schematic view of a spud pile.
In the figure: NACA airfoil structure 1, pile foundation through holes 101, reserved holes 102, strings 103, fixing piles 2, pile bodies 201, pile caps 202, pile foundations 3 and mortise and tenon structures 4.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.
Example 1:
the embodiment discloses a be used for serial pile foundation scour prevention NACA type water injection device of pier, including NACA airfoil structure 1 and a plurality of spud pile 2, NACA airfoil structure 1 is made by high strength plastic, and NACA airfoil structure 1's lateral wall is NACA airfoil curved surface.
Referring to fig. 3, a pile foundation through hole 101 for a plurality of fixing piles 2 and a pile foundation 3 to pass through is formed in the NACA airfoil structure 1, and the pile foundation through hole 101 penetrates through the upper plate surface and the lower plate surface of the NACA airfoil structure 1.
Referring to fig. 1 or 3, a cavity S exists between the hole wall of the pile foundation through hole 101 and the outer surface of the NACA airfoil structure 1, two reserved holes 102 are formed in the upper surface of the NACA airfoil structure 1, and sand or concrete mortar is injected into the cavity S through the reserved holes 102. The thickness of the inner side wall and the outer side wall of the NACA airfoil structure 1 is 3cm, and the height of the NACA airfoil structure 1 is consistent with the water depth of a river.
Referring to fig. 2, the upper surface of the NACA airfoil structure 1 is flush with the horizontal plane, the lower surface is in contact with the upper surface of the foundation soil layer of the bed bottom, and a plurality of fixing piles 2 and a plurality of tandem pile foundations 3 pass through pile foundation insertion holes 101. Wherein, the diameter of pile foundation 3 is d, and the minimum distance of spud pile 2 to pile foundation 3 is 1.5d, and d > 0 to prevent that spud pile 2 from producing great disturbance to pile foundation 3.
Referring to fig. 1 or 3, a mortise and tenon structure 4 is arranged on the NACA airfoil structure 1, and the mortise and tenon structure 4 penetrates through the upper and lower plate surfaces and the cavity S of the NACA airfoil structure 1. Referring to fig. 3, the NACA airfoil structure 1 is located on a chord line 103 of the NACA airfoil structure 1. The two prepared holes 102 are respectively positioned at two sides of the mortise and tenon structure 4. During the installation, untie mortise and tenon structure 4, pile foundation interlude hole 101 forms an opening in vertical direction, establishes NACA airfoil structure 1 cover on a plurality of tandem pile foundations 3 through this opening, and straining mortise and tenon structure 4 again.
Referring to fig. 4, the fixed pile 2 comprises a pile body 201 and a pile cap 202 connected to the top of the pile body 201, wherein the diameter of the pile body 201 is 15cm, and the diameter of the pile cap 202 is 25 cm.
Referring to fig. 1, 2 or 3, the pile bodies 201 of a plurality of fixing piles 2 are tightly attached to the inner side wall of the NACA airfoil structure 1, and the lower surface of the pile cap 202 is tightly attached to the upper surface of the NACA airfoil structure 1. The lower ends of a plurality of pile bodies 201 penetrate through the pile foundation through holes 101 and then are anchored into the foundation soil layer 3. The spuds 2 firmly stabilize the NACA aerofoil structure 1 both laterally and longitudinally.
Referring to fig. 3, the pile foundations 3 at the two extreme ends of the string are tightly attached to the inner side wall of the NACA airfoil structure 1, so that the NACA airfoil structure 1 is fixed and supported.
Example 2:
based on the device described in embodiment 1, the embodiment discloses a construction method for an anti-scouring NACA type water injection device for a tandem pier foundation, which includes the following steps:
1) and manufacturing the NACA airfoil structure 1 and a plurality of fixing piles 2 according to the actual size of the serial pile foundation in the engineering.
2) On the horizontal plane, untie mortise and tenon structure 4, pile foundation interlude hole 101 forms an opening in vertical direction, establishes NACA airfoil structure 1 on a plurality of tandem pile foundations 3 through this opening, and straining mortise and tenon structure 4 again. Wherein, the pile foundation 3 at both ends is clung to the inner side wall of the NACA airfoil structure 1.
3) Sand or concrete mortar is injected into the cavity S through the two prepared holes 102, and the NACA airfoil structure 1 sinks to the upper surface of the bed foundation soil layer under the action of gravity.
4) And drilling a plurality of fixing pile holes on the foundation soil layer of the bed bottom according to design requirements, and driving a plurality of fixing piles 2 into the fixing pile holes. The pile body 201 is tightly attached to the inner side wall of the NACA airfoil structure 1, and the lower surface of the pile cap 202 is tightly attached to the upper surface of the NACA airfoil structure 1.
Example 3:
the embodiment discloses a be used for serial pile foundation scour prevention NACA type water injection device of pier, including NACA airfoil structure 1 and a plurality of spud pile 2, the lateral wall of NACA airfoil structure 1 is NACA airfoil curved surface.
Referring to fig. 3, a pile foundation through hole 101 for a plurality of fixing piles 2 and a pile foundation 3 to pass through is formed in the NACA airfoil structure 1, and the pile foundation through hole 101 penetrates through the upper plate surface and the lower plate surface of the NACA airfoil structure 1.
There is cavity S between the inside wall of NACA airfoil structure 1 and the lateral wall, and the upper surface of NACA airfoil structure 1 is provided with two preformed holes 102, and grit or concrete mortar pours into cavity S through preformed hole 102.
Referring to fig. 1 or 2, the upper surface of the NACA airfoil structure 1 is flush with the horizontal plane, the lower surface of the NACA airfoil structure is in contact with the upper surface of the foundation soil layer of the bed bottom, and a plurality of fixing piles 2 and a plurality of tandem pile foundations 3 penetrate through pile foundation through holes 101.
Referring to fig. 4, the fixed pile 2 comprises a pile body 201 and a pile cap 202 connected to the top of the pile body 201, wherein the diameter of the pile body 201 is 20cm, and the diameter of the pile cap 202 is 30 cm. The pile bodies 201 of the fixing piles 2 are tightly attached to the inner side wall of the NACA airfoil structure 1, and the lower surface of the pile cap 202 is tightly attached to the upper surface of the NACA airfoil structure 1. The lower ends of the pile bodies 201 penetrate through the pile foundation through holes 101 and then extend into the foundation soil layer 3.
Referring to fig. 3, the pile foundations 3 at the extreme ends of the string are all tightly attached to the inner side wall of the NACA airfoil structure 1.
Example 4:
the main structure of this embodiment is the same as that of embodiment 3, and further, two mortise and tenon structures 4 are arranged on the NACA airfoil structure 1, and during installation, the two mortise and tenon structures 4 are unfastened, the NACA airfoil structure 1 is divided into two structures with arc grooves in the vertical direction, and the two structures with the arc grooves are buckled on the outer surfaces of a plurality of tandem pile foundations 3 and then fastened to the two mortise and tenon structures 4.
Example 5:
the main structure of this embodiment is the same as that of embodiment 4, and further, the NACA airfoil structure 1 is made of fibrous material.
Example 6:
the main structure of this embodiment is the same as embodiment 5, and further, the diameter of pile foundation 3 is d, and the minimum distance from spud pile 2 to pile foundation 3 is 2d, and d > 0, thereby preventing spud pile 2 from producing great disturbance to pile foundation 3.
Claims (4)
1. The utility model provides a be used for serial pile foundation scour protection NACA type water injection device of pier, its characterized in that: the NACA airfoil structure comprises an NACA airfoil structure (1) and a plurality of fixing piles (2), wherein the outer side wall of the NACA airfoil structure (1) is an NACA airfoil curved surface;
pile foundation through holes (101) for a plurality of fixing piles (2) and pile foundations (3) to penetrate through are formed in the NACA airfoil structure (1), and the pile foundation through holes (101) penetrate through the upper plate surface and the lower plate surface of the NACA airfoil structure (1); a cavity S is formed between the hole wall of the pile foundation through hole (101) and the outer surface of the NACA airfoil structure (1), a plurality of reserved holes (102) are formed in the upper surface of the NACA airfoil structure (1), and sand or concrete mortar is injected into the cavity S through the reserved holes (102);
the upper surface of the NACA airfoil structure (1) is flush with the horizontal plane, the lower surface of the NACA airfoil structure is in contact with the upper surface of a foundation soil layer of a bed bottom, and a plurality of fixed piles (2) and a plurality of tandem pile foundations (3) penetrate through pile foundation through holes (101);
the fixed pile (2) comprises a pile body (201) and a pile cap (202) connected to the top of the pile body (201), and the cross sectional area of the pile cap (202) is larger than that of the pile body (201); the pile bodies (201) of the fixed piles (2) are tightly attached to the inner side wall of the NACA airfoil structure (1), and the lower surface of the pile cap (202) is tightly attached to the upper surface of the NACA airfoil structure (1); the lower ends of the pile bodies (201) penetrate through the pile foundation through holes (101) and then are anchored in the foundation soil layer (3) of the bed bottom;
and the pile foundations (3) positioned at the two most ends of the series are tightly attached to the inner side wall of the NACA airfoil structure (1).
2. The anti-scouring NACA type water injection device for the serial pier foundation of claim 1, wherein: one or two mortise and tenon structures (4) are arranged on the NACA airfoil structure (1), and the mortise and tenon structures (4) penetrate through the upper plate surface, the lower plate surface and the cavity S of the NACA airfoil structure (1); the NACA airfoil structure (1) is positioned on a chord line (103) of the NACA airfoil structure (1);
if a mortise and tenon structure (4) is arranged on the NACA airfoil structure (1), the mortise and tenon structure (4) is untied during installation, a gap is formed in the pile foundation through hole (101) in the vertical direction, the NACA airfoil structure (1) is sleeved on a plurality of tandem pile foundations (3) through the gap, and then the mortise and tenon structure (4) is fastened;
if be provided with two mortise and tenon structures (4) on NACA airfoil structure (1), during the installation, untie these two mortise and tenon structures (4), NACA airfoil structure (1) is divided into two structures that have the arc groove in vertical direction, buckles these two structures that have the arc groove at the surface of a plurality of tandem pile foundations (3), fastens these two mortise and tenon structures (4) again.
3. An anti-scouring NACA type water injection device for tandem pier foundation according to claim 1 or 2, characterized in that: the NACA airfoil structure (1) is made of a high strength plastic or fibrous material.
4. The construction method for the anti-scouring NACA type water injection device of the tandem pier foundation according to claim 1 or 3, wherein: the method comprises the following steps:
1) manufacturing the NACA airfoil structure (1) and a plurality of fixing piles (2) according to the actual size of a serial pile foundation in the engineering;
2) unfastening the mortise and tenon structure (4), sleeving the NACA airfoil structure (1) on a plurality of tandem pile foundations (3), and then fastening the mortise and tenon structure (4); the pile foundations (3) at two ends are tightly attached to the inner side wall of the NACA airfoil structure (1);
3) sand or concrete mortar is injected into the cavity S through the plurality of preformed holes (102), and the NACA airfoil structure (1) sinks to the upper surface of the bed bottom foundation soil layer under the action of gravity;
4) drilling a plurality of fixing pile holes on the foundation soil layer of the bed bottom according to design requirements, and driving a plurality of fixing piles (2) into the fixing pile holes; the pile body (201) is tightly attached to the inner side wall of the NACA airfoil structure (1), and the lower surface of the pile cap (202) is tightly attached to the upper surface of the NACA airfoil structure (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067534.1A CN111236291B (en) | 2020-01-20 | 2020-01-20 | Anti-scouring NACA type water injection device for serial pier foundation and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010067534.1A CN111236291B (en) | 2020-01-20 | 2020-01-20 | Anti-scouring NACA type water injection device for serial pier foundation and construction method thereof |
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| CN111236291A true CN111236291A (en) | 2020-06-05 |
| CN111236291B CN111236291B (en) | 2020-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113718822A (en) * | 2021-09-16 | 2021-11-30 | 中国华能集团清洁能源技术研究院有限公司 | Scouring protection device for offshore wind power foundation |
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| KR20120091929A (en) * | 2011-02-10 | 2012-08-20 | 홍익대학교 산학협력단 | Prefabricated bridge piers protecting device using fiberglass reinforced plastics |
| CN103469830A (en) * | 2013-09-16 | 2013-12-25 | 水利部交通运输部国家能源局南京水利科学研究院 | Reduction method for basic wave current vibration of offshore wind power single pile |
| CN205804151U (en) * | 2016-07-07 | 2016-12-14 | 重庆交通大学 | A kind of pier anticollision Anti-scouring device |
| CN207659889U (en) * | 2017-09-13 | 2018-07-27 | 沈阳建筑大学 | A kind of double scrolling anticollision device of pier |
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2020
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20120091929A (en) * | 2011-02-10 | 2012-08-20 | 홍익대학교 산학협력단 | Prefabricated bridge piers protecting device using fiberglass reinforced plastics |
| CN102251470A (en) * | 2011-05-10 | 2011-11-23 | 南京工业大学 | Barrel-shaped composite material bridge anti-collision device |
| CN103469830A (en) * | 2013-09-16 | 2013-12-25 | 水利部交通运输部国家能源局南京水利科学研究院 | Reduction method for basic wave current vibration of offshore wind power single pile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113718822A (en) * | 2021-09-16 | 2021-11-30 | 中国华能集团清洁能源技术研究院有限公司 | Scouring protection device for offshore wind power foundation |
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