CN113431033A - Offshore implantable rock-socketed steel pipe pile bottom sealing construction method - Google Patents
Offshore implantable rock-socketed steel pipe pile bottom sealing construction method Download PDFInfo
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- CN113431033A CN113431033A CN202110624406.7A CN202110624406A CN113431033A CN 113431033 A CN113431033 A CN 113431033A CN 202110624406 A CN202110624406 A CN 202110624406A CN 113431033 A CN113431033 A CN 113431033A
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- pile
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- steel pipe
- concrete
- grouting
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
- 238000010276 construction Methods 0.000 title claims abstract description 42
- 238000007789 sealing Methods 0.000 title claims description 22
- 239000004567 concrete Substances 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000011435 rock Substances 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000002513 implantation Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 13
- 239000011178 precast concrete Substances 0.000 abstract description 10
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Images
Classifications
-
- 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
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
-
- 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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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Revetment (AREA)
Abstract
A steel pile casing, an assembled embedded core pile with precast concrete at the pile bottom and a high-performance grouting material are matched, after the steel pipe pile is manufactured, concrete is poured in a factory to manufacture the core pile, a plurality of distances are reserved between the bottom of the concrete and the cross section of the bottom of the steel pipe pile, the embedded rock pore-forming uneven surface can be conveniently implanted, and the high-performance grouting material is filled with the subsequent pressure grouting material. According to the method, pile bottom concrete implanted into the core pile is prefabricated in a steel pipe pile factory, and then the gap between the core pile and the bedrock is filled and blocked by using a high-performance grouting material, so that the marine concrete pouring construction process is omitted, the construction efficiency is greatly improved, and the construction window period is saved; meanwhile, the construction cost is saved, and the method has important significance for improving the efficiency and saving the cost of the offshore wind power rock-socketed pile foundation construction.
Description
Technical Field
The invention relates to the technical field of steel pipe pile installation, in particular to a bottom sealing construction method of an offshore implanted rock-socketed steel pipe pile.
Background
Wind energy is clean energy, and simultaneously, offshore wind energy is richer than onshore wind energy, the coastline of China is long, and offshore wind energy resources are rich in coastal areas; however, the geological conditions of wind fields in various regions are large in difference, and a large number of seabed covering soil layers are shallow, so that the construction condition that rock embedding is required to be carried out on the foundation steel pipe pile end of the offshore wind turbine structure exists.
The steel-pipe pile implanted rock-socketed construction generally adopts the method that the steel protects a section of thick bamboo and squeezes into the seabed with the vibration hammer, protect a lower tip and pierce through the cover soil layer, until the basement rock surface, put into the steel with the rig again and protect a section of thick bamboo inside, drill the basement rock, reach predetermined drilling depth after, will inlay in the rock core pile implants the steel protects a section of thick bamboo, generally in order to increase the shearing and the bending resistance bearing capacity of core pile, the area that is close the basement rock at the core pile bottom can pour into pile bottom concrete, generally be little expanded ordinary strength concrete, because in pile bottom elevation position, the rig pore-forming often can not guarantee that the basement rock surface is level, the cast-in-place concrete at the core pile bottom can divide and pour twice: pouring the bottom-sealing concrete of the pile bottom for leveling and plugging the pile bottom to prevent further pouring concrete from overflowing, pouring the residual concrete in the pile to a preset elevation after the strength of the concrete reaches the design requirement, performing grouting operation between the embedded core pile and the steel casing after the strength of the concrete of the pile bottom reaches the design requirement, and pouring a high-performance grouting material into a gap between the embedded core pile and the steel casing to combine the embedded core pile and the steel casing into a whole.
However, in the existing construction process, the pile bottom concrete poured twice needs to reach the design strength, the offshore construction period is long, and the lease and use cost of the ship engine are increased due to the delay of the construction period; meanwhile, the problem of limited construction window period exists due to variable sea wind and wave environments in the offshore construction, and the effective construction period can be missed due to the increase of the construction period; furthermore, the compactness of the underwater concrete casting may not be guaranteed, and a concrete mixer ship capable of adapting to sea conditions needs to be configured, so that the construction cost is further increased.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and provides a bottom sealing construction method of a marine implanted rock-socketed steel pipe pile, which can greatly improve construction efficiency, save construction window period and save construction cost.
The technical problem to be solved by the present invention is achieved by the following technical means. The invention relates to a bottom sealing construction method of an offshore implanted socketed steel pipe pile, which comprises the following steps:
(1) core pile manufacturing
After the steel pipe pile is manufactured, concrete is poured at the lower part of the steel pipe pile, and a certain space is reserved between the poured concrete and the bottom of the steel pipe pile to manufacture a core pile;
(2) pre-buried grouting pipeline
Arranging a plurality of grouting pipelines on the outer wall of the top of the core pile, wherein the tail ends of the grouting pipelines extend to different height positions of the core pile, and the tail ends of the grouting pipelines at the lower position of the core pile enter the core pile and penetrate through concrete in the core pile to extend to the bottom of the core pile;
(3) core pile implantation
After the steel casing is sunk and rock embedding and hole forming are completed in the steel casing, the core pile is implanted into the steel casing;
(4) pressure grouting
The method comprises the following steps of firstly utilizing a grouting pipeline at the bottom of a core pile to perform pressure grouting on a reserved space at the bottom of concrete in the core pile and a gap between the core pile and a drilled hole, replacing the grouting pipeline with a higher grouting pipeline layer when grouting pressure reaches a preset design value, performing pressure grouting on the gap between a steel casing and the core pile, and directly pouring the grouting pipeline to a preset design elevation under the condition of no pipe blockage.
The technical problem to be solved by the present invention can be further solved by the following technical solution, in the offshore implantable rock-socketed steel pipe pile bottom sealing construction method, in the step (1), the length of the poured concrete is one fourth of the length of the steel pipe pile, and the length of the space reserved between the poured concrete and the bottom of the steel pipe pile is 0.4 m.
The technical problem to be solved by the invention can be further realized by the following technical scheme that in the offshore implantable rock-socketed steel pipe pile bottom sealing construction method, in the step (1), a plurality of steel bar shear keys with the diameter of 10 mm are arranged in the poured concrete at intervals of 0.5 m.
The technical problem to be solved by the invention can be further realized by the following technical scheme that in the offshore implanted rock-socketed steel pipe pile bottom sealing construction method, in the step (1), a channel convenient for arranging a grouting pipeline is reserved when concrete is poured in the steel pipe pile.
The technical problem to be solved by the invention can be further realized by the following technical scheme that in the offshore implantable rock-socketed steel pipe pile bottom sealing construction method, in the step (2), two grouting pipelines are annularly arranged at the height of each layer of the core pile.
The technical problem to be solved by the invention can be further realized by the following technical scheme that in the offshore implantable rock-socketed steel pipe pile bottom sealing construction method, in the step (3), the length of the bottom of the core pile entering the lower part of the surface of weathered rock is three times of the diameter of the pile.
Compared with the prior art, the invention has the advantages that:
1. the method can save the time for pouring the bottom sealing concrete twice at sea on site and waiting, greatly shortens the construction period of offshore installation, and can save the effective window period of each pile for 2-3 days; meanwhile, the lease and the use of a concrete mixing ship for offshore construction are saved, and the construction cost can be greatly saved;
2. the method changes the offshore underwater bottom sealing concrete pouring into the method of prefabricating and pouring in a factory, and ensures the requirements of the strength and the compactness of the pile bottom concrete;
3. a certain height is reserved between the bottom surface of the assembled concrete in the core pile and the bottom of the pile, and the space and the gap between the core pile and the rock-socketed hole are filled with the gap between the steel casing and the implanted core pile in the prior art in a mode of pressure grouting high-performance grouting materials at one time, so that the structural integrity is ensured.
Drawings
FIG. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic plan view of a grout line according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, a bottom sealing construction method of an offshore implanted rock-socketed steel pipe pile 1 adopts the matching of a steel casing 2, an assembled implanted core pile with pile bottom precast concrete 3 and a high-performance grouting material,
the steel pile casing 2 is used for driving the steel pile casing 2 into the seabed to the surface of bedrock by using a vibration hammer before rock-socketing operation, performing rock-socketed hole forming operation of a drilling machine in the steel pile casing 2, and taking the steel pile casing 2 as external restraint of a core pile during pile planting;
the core stake is implanted to assembled with pile bottom precast concrete 3: in order to increase the bending resistance and the shearing resistance of the bottom of the core pile, pouring concrete 3 at the bottom of the core pile after the core pile of a processing plant is manufactured, and forming an assembled combined structure; the section from the bottom of the precast concrete 3 to the bottom of the core pile is spaced for a plurality of distances, so that the precast concrete can be conveniently implanted into the uneven surface in the rock-socketed hole, and is filled with a subsequent pressure grouting high-performance grouting material;
high-strength grouting material: filling a gap between the steel casing 2 and the core pile and a gap between the bottom of the core pile and the rock-socketed hole at one time by using a pressure-poured high-performance grouting material;
the method comprises the following specific steps:
(1) fabricated embedded core pile with precast concrete 3 at pile bottom
After the steel pipe pile 1 is manufactured, pouring concrete 3 in a factory, wherein because the length of the steel pipe pile 1 is generally large, a construction mode of horizontally placing the layer-by-layer concrete 3 is adopted, and in order to ensure the quality of the precast concrete 3 in the pile, the precast concrete is poured to a position which is about 0.4m away from the pile top for multiple times;
meanwhile, in order to ensure the bonding strength of the concrete 3 and the steel pipe pile 1, a plurality of phi 10 steel bar shear keys are arranged every 0.5m in a section 5m at the bottom of the section 3 of the poured concrete;
(2) pre-buried grouting line 4
Arranging grouting pipelines 4 on the outer wall of the top of the implanted core pile, arranging a plurality of grouting pipelines 4 in total, entering different height positions, arranging two grouting pipelines 4 at each layer of height position in an annular manner, enabling the bottom grouting pipeline 4 to enter the core pile when approaching the bottom position of the steel casing 2 after pile planting, penetrating the precast concrete 3 at the pile bottom, reaching the bottom of the core pile, facilitating subsequent pressure grouting, and therefore, when pouring the concrete 3 at the bottom of the core pile, paying attention to reserve 4 channels of the grouting pipelines;
(3) core implantation pile
After the steel casing 2 is sunk and rock-socketed holes are drilled in the steel casing 2, the core pile is implanted into the steel casing 2, and the bottom of the core pile enters the lower part of the surface of the weathered rock by the length of three times of the diameter of the pile;
(4) pressure grouting
Firstly, performing pressure grouting on a reserved space at the bottom of core pile precast concrete 3 and a gap between a core pile and a drilled space by using a grouting pipeline 4 at the bottom of the core pile;
because the density of the grouting material is greater than that of the broken stones and the silt, residual silt and broken stones in the drilled holes at the bottom of the core pile can be pressed out from the grout-overflowing holes by utilizing the grout-overflowing holes reserved on the hole wall of the space at the bottom of the core pile and the pressure grouting mode, and the overflowed grouting material can continuously fill the gap between the core pile and the drilled space;
when the grouting pressure reaches a preset design value, replacing the grouting pipeline 4 on the upper layer, performing pressure grouting on the gap between the steel casing 2 and the core pile, and directly grouting to a preset design elevation under the condition of not blocking the pipe;
if the pipe blockage phenomenon occurs, the grouting pipeline 4 can be further replaced by a reserved upper layer.
The application has the advantages that:
1. the method can save the time for pouring the bottom sealing concrete twice at sea on site and waiting, greatly shortens the construction period of offshore installation, and can save the effective window period of each pile for 2-3 days; meanwhile, the lease and the use of a concrete mixing ship for offshore construction are saved, and the construction cost can be greatly saved;
2. the method changes the offshore underwater bottom sealing concrete pouring into the method of prefabricating and pouring in a factory, and ensures the requirements of the strength and the compactness of the pile bottom concrete;
3. a certain height is reserved between the bottom surface of the assembled concrete in the core pile and the bottom of the pile, and the space and the gap between the core pile and the rock-socketed hole are filled with the gap between the steel casing and the implanted core pile in the prior art in a mode of pressure grouting high-performance grouting materials at one time, so that the structural integrity is ensured.
Claims (6)
1. A bottom sealing construction method for an offshore implanted socketed steel pipe pile is characterized by comprising the following steps: the method comprises the following steps:
(1) core pile manufacturing
After the steel pipe pile is manufactured, concrete is poured at the lower part of the steel pipe pile, and a certain space is reserved between the poured concrete and the bottom of the steel pipe pile, so that the core pile can be manufactured;
(2) pre-buried grouting pipeline
Arranging a plurality of grouting pipelines on the outer wall of the top of the core pile, wherein the tail ends of the grouting pipelines extend to different height positions of the core pile, and the tail ends of the grouting pipelines at the lower position of the core pile enter the core pile and penetrate through concrete in the core pile to extend to the bottom of the core pile;
(3) core pile implantation
Sinking the steel pile casing, and implanting the core pile into the steel pile casing after the steel pile casing is sunk and rock-socketed holes are drilled in the steel pile casing;
(4) pressure grouting
The method comprises the following steps of firstly utilizing a grouting pipeline at the bottom of a core pile to perform pressure grouting on a reserved space at the bottom of concrete in the core pile and a gap between the core pile and a drilled hole, replacing the grouting pipeline with a higher grouting pipeline layer when grouting pressure reaches a preset design value, performing pressure grouting on the gap between a steel casing and the core pile, and directly pouring the grouting pipeline to a preset design elevation under the condition of no pipe blockage.
2. The offshore implantable socketed steel pipe pile bottom sealing construction method according to claim 1, characterized in that: in the step (1), the length of the poured concrete is one fourth of the length of the steel pipe pile, and the length of a reserved space between the poured concrete and the bottom of the steel pipe pile is 0.4 m.
3. The offshore implantable socketed steel pipe pile bottom sealing construction method according to claim 1 or 2, characterized in that: in the step (1), a plurality of steel bar shear keys with the diameter of 10 mm are arranged in the poured concrete every 0.5 m.
4. The offshore implantable socketed steel pipe pile bottom sealing construction method according to claim 1 or 2, characterized in that: in the step (1), when concrete is poured into the steel pipe pile, a channel convenient for arranging a grouting pipeline is reserved.
5. The offshore implantable socketed steel pipe pile bottom sealing construction method according to claim 1, characterized in that: in the step (2), two grouting pipelines are arranged at the height of each layer of the core pile in the circumferential direction.
6. The offshore implantable socketed steel pipe pile bottom sealing construction method according to claim 1, characterized in that: in the step (3), the length of the bottom of the core pile entering the lower part of the surface of the weathered rock is three times of the diameter of the pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110624406.7A CN113431033A (en) | 2021-06-04 | 2021-06-04 | Offshore implantable rock-socketed steel pipe pile bottom sealing construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110624406.7A CN113431033A (en) | 2021-06-04 | 2021-06-04 | Offshore implantable rock-socketed steel pipe pile bottom sealing construction method |
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| CN113431033A true CN113431033A (en) | 2021-09-24 |
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| CN202110624406.7A Pending CN113431033A (en) | 2021-06-04 | 2021-06-04 | Offshore implantable rock-socketed steel pipe pile bottom sealing construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115012379A (en) * | 2022-06-16 | 2022-09-06 | 中国能源建设集团广东省电力设计研究院有限公司 | Self-installation and reinforcement method for offshore converter station platform |
| CN115262614A (en) * | 2022-09-05 | 2022-11-01 | 中国长江三峡集团有限公司 | Embedded rock-socketed pile foundation and construction method |
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2021
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| CN115012379A (en) * | 2022-06-16 | 2022-09-06 | 中国能源建设集团广东省电力设计研究院有限公司 | Self-installation and reinforcement method for offshore converter station platform |
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| CN115262614A (en) * | 2022-09-05 | 2022-11-01 | 中国长江三峡集团有限公司 | Embedded rock-socketed pile foundation and construction method |
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Application publication date: 20210924 |