CN111663554A - Pile shoe bottom sealing system for post-pile construction and sealing method thereof - Google Patents
Pile shoe bottom sealing system for post-pile construction and sealing method thereof Download PDFInfo
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- CN111663554A CN111663554A CN202010589334.2A CN202010589334A CN111663554A CN 111663554 A CN111663554 A CN 111663554A CN 202010589334 A CN202010589334 A CN 202010589334A CN 111663554 A CN111663554 A CN 111663554A
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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
- E02D27/42—Foundations for poles, masts or chimneys
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
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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
- E02D27/44—Foundations for machines, engines or ordnance
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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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
- E02D31/02—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 against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/72—Pile shoes
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Piles And Underground Anchors (AREA)
Abstract
The invention belongs to the technical field of ocean engineering construction, and particularly relates to a pile shoe bottom sealing system for post-pile construction and a sealing system thereof. The invention utilizes the expanded high polymer to carry out the filling sealing between the jacket foundation pile shoe and the steel pipe pile, and has good sealing effect and plugging effect.
Description
Technical Field
The invention belongs to the technical field of ocean engineering construction, and particularly relates to a pile shoe bottom sealing system and a sealing method for post-pile construction.
Background
The offshore wind turbine and the booster station are located in a severe marine environment, and the foundation of the offshore wind turbine and the booster station is required to bear the load from the upper part of the bearing platform and resist huge environmental load, so that the structural requirement and the construction process requirement of the offshore wind turbine and the booster station are very strict, and the stability and the safety of an offshore platform are ensured.
Offshore wind turbines have many different structural forms, including gravity type, single pile type, suction type, three-pile (multi-pile) jacket type, floating type and other forms, in which jacket foundations are widely used, and next to single-pile applications, the foundation form of offshore booster stations is also widely used by jacket. The jacket foundation is a space frame type structure, and has the advantages of small rod diameter, high strength, light weight, small wave flow effect and suitability for deeper sea areas. The jacket foundation can be divided into two structural forms according to the construction sequence: pile driving jacket and pile driving jacket after. The main structures of the two jacket forms are the same, the pile shoe is not needed to be arranged at the tail end of the jacket supporting leg by piling first, and the pile shoe is arranged at the tail end of the pile-piling jacket foundation supporting leg.
The rear pile method construction adopts that a rear pile driving jacket is adopted, a jacket foundation is required to be placed on a sea bed surface firstly in the construction process, the bottom of a pile shoe is in contact with a mud surface, then a steel pipe pile penetrates through the pile shoe and is driven into the sea bed, the pile shoe and the steel pipe pile are both of annular columnar structures, the inner diameter of the pile shoe is larger than the outer diameter of the steel pipe pile, the pile shoe and the steel pipe pile are connected through grouting materials such as concrete, and therefore, loads such as the upper part of a jacket bearing platform, waves, ocean currents and the like can be transmitted to the steel pipe pile through the pile shoe through the grouting materials, and the steel pipe pile transmits the loads to the sea bed, so that the structural strength and the stability of the offshore wind power structure.
Jacket grouting is a key technology for the construction of the whole wind power foundation structure, and whether grouting is successful or not is directly related to the capability of the offshore wind power foundation structure for resisting environmental load and the service life of the offshore wind power foundation structure. Because the diameters of the jacket pile shoe and the pipe pile are different, an annular gap exists between the jacket pile shoe and the pipe pile, and the grouting material is used for filling the annular space so as to ensure that the load can be transmitted to the steel pipe pile through the pile shoe and finally the force is transmitted to the seabed.
In order to prevent slurry from leaking in the grouting process, the bottom of the annular space needs to be sealed, namely, the bottom of the jacket pile shoe is sealed, and two types of currently popular sealing methods are adopted, namely, the first type is air bag type sealing: the working principle is that the sealing air bag is installed at the bottom of the pile shoe, an air pressure transmission pipeline is installed at the same time, then after the installation positioning and the pile driving of the jacket are completed, the air bag is inflated and expanded by adopting air pressure equipment to seal the annular space between the pile shoe and the steel pipe pile, and finally grouting is performed; the second method is mechanical sealing, the method adopts sealing strips such as rubber sheets or steel plates and the like to be installed at the bottom of a pile shoe in a bolt connection or welding mode, after a steel pipe pile penetrates through the sealing strips, a pile body and the sealing strips are mutually extruded and tightly contacted to generate friction force to resist the pressure of grouting liquid and seawater on the sealing strips during grouting, and only one sealing strip or two sealing strips can be installed.
Although the two methods are popular at present, complete sealing cannot be guaranteed, grouting liquid is prone to leaking from the bottom of the pile shoe and seepage of seawater in the construction process, resource waste is caused, construction cost is increased, and meanwhile a lot of fine sand mixed in the seawater is prone to entering a sealed space through a gap between the pile shoe and the steel pipe pile, and accordingly sealing performance is affected.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides a pile shoe bottom sealing system for post-pile construction and a technical scheme of a sealing method thereof.
The pile shoe bottom sealing system for the post-pile construction comprises a jacket foundation arranged on a seabed, a plurality of pile shoes arranged around the lower end of the jacket foundation and a plurality of steel pipe piles inserted into the seabed, wherein the steel pipe piles are inserted into the corresponding pile shoes.
The pile shoe bottom sealing system for the post-pile construction is characterized in that the steel wire brush is of an annular structure and comprises a brush holder fixedly matched on the inner wall of the pile shoe and brush bristles distributed along the brush holder in an annular mode, and the inner ends of the brush bristles are tightly attached to the outer wall of the steel pipe pile.
The pile shoe bottom sealing system for the post-pile construction is characterized in that the first sealing division bar and the second sealing division bar are of annular structures and are fixed on the inner wall of the pile shoe or welded on the inner wall of the pile shoe through bolts, and the inner ends of the two sealing division bars are tightly attached to the outer wall of the steel pipe pile.
The pile shoe bottom sealing system for the post-pile construction is characterized in that the steel pipe pile penetrates through the diaphragm and then is inserted into a seabed.
The pile shoe bottom sealing system for the post-pile construction is characterized in that a filling pipe for filling expansion high polymer is arranged on the side part of the pile shoe, and the position of the filling pipe corresponds to the position of the second containing cavity.
The pile shoe bottom sealing method for post-pile construction is characterized by comprising the following steps of:
s1: pile shoes are arranged around the bottom of the jacket foundation, diaphragms are arranged at the bottom of the pile shoes, and first sealing parting strips, steel wire brushes and second sealing parting strips are arranged on the upper and lower parts of the inner walls of the pile shoes;
s2: arranging a jacket foundation on a seabed, inserting a steel pipe pile into a pile shoe, driving the lower end of the steel pipe pile into the seabed, penetrating a diaphragm at the lower end of the steel pipe pile, and tightly attaching the steel pipe pile and two sealing parting strips so that the two sealing parting strips vertically divide a gap between the steel pipe pile and the pile shoe into a first containing cavity and a second containing cavity;
s3: filling the second cavity with expanded high polymer;
s4: and grouting into the first containing cavity, filling the first containing cavity with concrete slurry, discharging seawater in the pile shoe, and fixedly connecting the pile shoe and the steel pipe pile after the concrete slurry is solidified, so that the offshore wind power jacket foundation is installed.
The pile shoe bottom sealing method for the post-pile construction is characterized in that the side wall of the pile shoe is provided with a filling pipe for filling the expanded high polymer into the second containing cavity, and the residual seawater in the second containing cavity is extruded out through the filling pipe on the side wall of the pile shoe when the expanded high polymer expands underwater.
The pile shoe bottom sealing method for post-pile construction is characterized in that after the steel pipe pile is driven into a seabed, a jacket foundation is leveled, and then the step S3 is carried out.
Compared with the prior art, the invention aims at the construction process of the post-pile method, two sealing parting strips are fixed at the bottom of the pile shoe firstly, then the steel pipe pile is driven into the seabed, a first containing cavity and a second containing cavity are formed between the two cavities, the second containing cavity is filled with the expanded high polymer, and the expanded high polymer forms sealing after underwater expansion.
Drawings
FIG. 1 is a schematic view of the construction of the shoe bottom sealing system of the present invention;
FIG. 2 is an enlarged partial schematic view of the shoe bottom seal system of the present invention;
fig. 3 is a schematic view of fig. 2 with concrete and expanded high polymer removed.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1-3, a pile shoe bottom sealing system and a sealing system thereof for post-pile construction includes a jacket foundation 3 disposed on a seabed 4, a plurality of pile shoes 2 disposed around the lower end of the jacket foundation 3, and a plurality of steel pipe piles 1 inserted into the seabed 4, the steel pipe piles 1 are inserted into the corresponding pile shoes 2, diaphragms 11 are disposed at the bottom of the pile shoes 2, first sealing spacers 6, steel wire brushes 7, and second sealing spacers 10 are disposed between the pile shoes 2 and the piles 1, the first sealing spacers 6 and the second sealing spacers 10 divide a gap between the pile shoes 2 and the steel pipe piles 1 into a first chamber 13 and a second chamber 12, the first chamber 13 is filled with an expanded polymer 9, and the second chamber 12 is filled with concrete 14.
As an optimization: the steel wire brush 7 is of an annular structure and comprises a brush seat 701 fixedly matched on the inner wall of the pile shoe 2 and brush hairs 700 annularly distributed along the brush seat 701, and the inner ends of the brush hairs 700 are tightly attached to the outer wall of the steel pipe pile 1.
As an optimization: the first sealing division bar 6 and the second sealing division bar 10 are both of annular structures and are fixed on the inner wall of the pile shoe 2 through bolts and nuts, and the inner ends of the two sealing division bars are tightly attached to the outer wall of the steel pipe pile 1. Furthermore, the sealing spacers may also be welded to the inner wall of the shoe 2.
As an optimization: the steel pipe pile 1 penetrates through the diaphragm 11 and then is inserted into the seabed 4.
As an optimization: and a filling pipe 8 for filling the expanded high polymer is arranged at the side part of the pile shoe 2, and the position of the filling pipe 8 corresponds to the position of the second cavity 12.
A sealing method of the pile shoe bottom sealing system comprises the following steps:
s1: the periphery of the bottom of the jacket foundation 3 is provided with a pile shoe 2, a diaphragm 11 is arranged at the bottom of the pile shoe 2, and a first sealing parting bead 6, a steel wire brush 7 and a second sealing parting bead 10 are arranged on the upper and lower parts of the inner wall of the pile shoe 2;
s2: arranging a jacket foundation 3 on a seabed 4, filling seawater into a pile shoe 2 at the moment, inserting a steel pipe pile 1 into the pile shoe 2, driving the lower end of the steel pipe pile 1 into the seabed 4, penetrating a diaphragm 11 at the lower end of the steel pipe pile 1, and tightly attaching the steel pipe pile 1 and two sealing parting strips, so that the two sealing parting strips vertically divide a gap between the steel pipe pile 1 and the pile shoe 2 into a first containing cavity 13 and a second containing cavity 12;
s3: filling the second cavity 12 with the expanded high polymer 9;
s4: grouting into the first containing cavity 13, filling the first containing cavity 13 with concrete slurry, discharging seawater in the pile shoe 2, and fixedly connecting the pile shoe 2 with the steel pipe pile 1 after the concrete slurry is solidified, so that loads such as waves and ocean currents and the like can be transmitted to the steel pipe pile 1 through the pile shoe 2 through grouting materials, and the steel pipe pile 1 transmits the loads to the seabed 4, thereby ensuring the structural strength and stability of an offshore wind turbine and a booster station, and further completing the installation of the offshore wind power jacket foundation.
As an optimization: the side wall of the pile shoe 2 is provided with a filling pipe 8 for filling the second containing cavity 12 with the expanded high polymer 9, during specific operation, pressure filling equipment such as a pump is adopted to fill the filling pipe 8, and when the expanded high polymer 9 expands underwater, the residual seawater in the second containing cavity 12 is extruded out through the filling pipe 8 on the side wall of the pile shoe 2.
As an optimization: after the steel pipe pile 1 is driven into the seabed 4, the jacket foundation 3 is leveled, and then step S3 is performed.
The above step S1 is performed on land. The first sealing division bar 6, the wire brush 7, the second sealing division bar 10 and the diaphragm 11 are arranged at a certain distance from top to bottom. The steel wire hairbrush 7 is mainly used for preventing the expanded high polymer 9 from entering the grouting annular space 13 after the sealing ring is broken, so that the grouting quality is influenced, and the structural safety is finally influenced. The diaphragm 11 is the first line of defense to prevent silt 4 from entering the annular space. The inner diameters of the two sealing parting strips are slightly smaller than the outer diameter of the steel pipe pile 1, after the steel pipe pile 1 is inserted into the pile shoe 2, the pile body and the sealing parting strips are in close contact and mutually extruded to form a first annular closed cavity 13 and a second annular closed cavity 12.
In the above step S3, after the expanded polymer 9 expands underwater, the expanded polymer fills the second cavity 12 between the second seal spacer 10 and the wire brush 7, if the expanded polymer 9 passes through the wire brush 7, the first seal spacer 6 can also block the expanded polymer to achieve the purpose of grouting and plugging, and meanwhile, the remaining seawater in the expanded polymer is discharged through the filling pipe 8 on the sidewall of the pile shoe 2, at this time, the second cavity 12 is in a fully-closed state, so that the concrete slurry cannot leak from the bottom, and the seawater cannot seep into the first cavity 12 from the bottom.
Compared with the traditional method, the sealing method has the following advantages and innovation points:
1. the expanded polymer is used for filling and sealing between the jacket foundation pile shoe and the steel pipe pile, and the sealing effect and the leakage stopping effect are good.
2. The bottom of the pile shoe is provided with a diaphragm, so that a first barrier is provided for preventing silt from entering the pouring space.
3. The expanded polymer has good rapid cementing performance, and if fine sand enters a gap between the steel pipe pile and the pile shoe through the gap, the material can also rapidly cement the fine sand into a whole, so that the tightness is ensured.
4. Two sealing parting strips are pre-installed at the bottom of the pile shoe, so that convenience is provided for later installation construction and filling sealing operation, and the construction efficiency is improved.
5. The steel wire brush is installed to first sealed parting bead below, prevents that first sealed parting bead from breaking the back, and the inflation high polymer gets into first appearance chamber, influences the grout quality, finally influences structure security, and the installation of steel wire brush provides dual guarantee for the security of overall structure.
6. The application range is wider, and the jacket foundation can be applied to offshore wind turbine jacket foundations and booster station jacket foundations.
The expanded polymer is a known technology, is specifically made of a high-strength two-component polyurethane material disclosed in Chinese patent with publication number CN 110511340A, and can also be made of other materials with the same function.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A pile shoe bottom sealing system for post-pile construction comprises a jacket foundation (3) arranged on a seabed (4), a plurality of pile shoes (2) arranged around the lower end of the jacket foundation (3) and a plurality of steel pipe piles (1) inserted into the seabed (4), wherein the steel pipe piles (1) are inserted into the corresponding pile shoes (2), the novel steel pipe pile is characterized in that a diaphragm (11) is arranged at the bottom of a pile shoe (2), a first sealing spacer strip (6), a steel wire brush (7) and a second sealing spacer strip (10) are arranged between the pile shoe (2) and a steel pipe pile (1) from top to bottom, the gap between the pile shoe (2) and the steel pipe pile (1) is divided into a first containing cavity (13) and a second containing cavity (12) from top to bottom through the first sealing spacer strip (6) and the second sealing spacer strip (10), the first containing cavity (13) is filled with expansion high polymer (9), and the second containing cavity (12) is filled with concrete (14).
2. A pile shoe bottom sealing system for post-piling construction according to claim 1, wherein the wire brush (7) is of a ring structure comprising a brush holder (701) fixedly fitted to the inner wall of the pile shoe (2) and bristles (700) arranged along the brush holder (701), the inner ends of the bristles (700) closely fitting to the outer wall of the steel pipe pile (1).
3. The pile shoe bottom sealing system for the post-pile construction method according to claim 1, wherein the first sealing parting strip (6) and the second sealing parting strip (10) are both of an annular structure and are fixed on the inner wall of the pile shoe (2) or welded on the inner wall of the pile shoe (2) through bolts, and the inner ends of the two sealing parting strips are tightly attached to the outer wall of the steel pipe pile (1).
4. The pile shoe bottom sealing system for post-pile construction according to claim 1, wherein the steel pipe pile (1) is inserted into the seabed (4) after penetrating the diaphragm (11).
5. The pile shoe bottom sealing system for the post-pile construction according to claim 1, wherein the pile shoe (2) is provided with a pouring pipe (8) at the side for pouring the expanded high polymer, and the position of the pouring pipe (8) corresponds to the position of the second cavity (12).
6. A pile shoe bottom sealing method for post-pile construction is characterized by comprising the following steps:
s1: pile shoes (2) are arranged around the bottoms of the jacket foundations (3), diaphragms (11) are arranged at the bottoms of the pile shoes (2), and first sealing parting strips (6), steel wire brushes (7) and second sealing parting strips (10) are arranged on the upper and lower parts of the inner walls of the pile shoes (2);
s2: arranging a jacket foundation (3) on a seabed (4), inserting a steel pipe pile (1) into a pile shoe (2), driving the lower end of the steel pipe pile (1) into the seabed (4), penetrating a diaphragm (11) at the lower end of the steel pipe pile (1), and tightly attaching the steel pipe pile (1) and two sealing parting strips, so that the gap between the steel pipe pile (1) and the pile shoe (2) is vertically divided into a first containing cavity (13) and a second containing cavity (12) by the two sealing parting strips;
s3: filling the second cavity (12) with the expanded high polymer (9);
s4: and grouting into the first containing cavity (13), filling concrete slurry into the first containing cavity (13), discharging seawater in the pile shoe (2), and fixedly connecting the pile shoe (2) and the steel pipe pile (1) after the concrete slurry is solidified, thereby completing the installation of the offshore wind power jacket foundation.
7. The method for sealing the bottom of the pile shoe for the post-pile construction according to claim 6, wherein the side wall of the pile shoe (2) is provided with a pouring pipe (8) for pouring the expanded high polymer (9) into the second cavity (12), and the expanded high polymer (9) expands underwater while the residual seawater in the second cavity (12) is squeezed out through the pouring pipe (8) on the side wall of the pile shoe (2).
8. The pile shoe bottom sealing method for the post-pile construction according to claim 6, wherein the leveling of the jacket base (3) is performed after the steel pipe pile (1) is driven into the seabed (4), and then the step S3 is performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010589334.2A CN111663554B (en) | 2020-06-24 | 2020-06-24 | Pile shoe bottom sealing system for post-pile construction and sealing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010589334.2A CN111663554B (en) | 2020-06-24 | 2020-06-24 | Pile shoe bottom sealing system for post-pile construction and sealing method thereof |
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| CN111663554A true CN111663554A (en) | 2020-09-15 |
| CN111663554B CN111663554B (en) | 2021-08-03 |
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| CN115198788A (en) * | 2022-09-13 | 2022-10-18 | 南通泰胜蓝岛海洋工程有限公司 | Jacket hoisting construction process |
| CN117888517A (en) * | 2024-03-14 | 2024-04-16 | 南通泰胜蓝岛海洋工程有限公司 | Boost station jacket active sealing ring auxiliary installation structure and installation method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115198788A (en) * | 2022-09-13 | 2022-10-18 | 南通泰胜蓝岛海洋工程有限公司 | Jacket hoisting construction process |
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| CN117888517A (en) * | 2024-03-14 | 2024-04-16 | 南通泰胜蓝岛海洋工程有限公司 | Boost station jacket active sealing ring auxiliary installation structure and installation method |
| CN117888517B (en) * | 2024-03-14 | 2024-05-07 | 南通泰胜蓝岛海洋工程有限公司 | Boost station jacket active sealing ring auxiliary installation structure and installation method |
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| Publication number | Publication date |
|---|---|
| CN111663554B (en) | 2021-08-03 |
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