CN114215049A - Construction method for main steel casing of bored pile under deep water foundation and bare rock environment - Google Patents
Construction method for main steel casing of bored pile under deep water foundation and bare rock environment Download PDFInfo
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- CN114215049A CN114215049A CN202111500180.6A CN202111500180A CN114215049A CN 114215049 A CN114215049 A CN 114215049A CN 202111500180 A CN202111500180 A CN 202111500180A CN 114215049 A CN114215049 A CN 114215049A
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- steel casing
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- auxiliary steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 136
- 239000010959 steel Substances 0.000 title claims abstract description 136
- 239000011435 rock Substances 0.000 title claims abstract description 44
- 238000010276 construction Methods 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 16
- 230000001681 protective effect Effects 0.000 claims description 15
- 238000004873 anchoring Methods 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000007596 consolidation process Methods 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000009440 infrastructure construction Methods 0.000 description 1
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- 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
- E02D15/08—Sinking workpieces into water or soil inasmuch as not provided for elsewhere
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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)
- Foundations (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention discloses a construction method of a main steel casing of a bored pile under deep water foundation and bare rock environment, which comprises the steps of leveling a seabed by adopting an auxiliary steel casing when constructing a large-diameter bored pile in a deep water sea area, then drilling in a drilling channel of the auxiliary steel casing, hollowing out bare rock at the position of a cylinder wall, then hanging away the auxiliary steel casing, placing the main steel casing in the hollowed hole, and finally grouting and embedding inside and outside the main steel casing of a circular ring hole to form an embedded layer, wherein the main steel casing is of a stable structure. The construction method for sinking the main steel casing of the drilling pile by utilizing the auxiliary steel casing has lower requirement on the plane precision of the primary pilot hole, provides a self-stabilizing foundation for the main steel casing in the environment of bare rock and inclined rock surface, greatly facilitates the rapid rock entering of the auxiliary steel casing in bare rock geology, solves the embedding problem of the main steel casing in the environment of bare rock geology, reduces the risk of offshore construction, and generates better economic benefit.
Description
Technical Field
The invention relates to a construction method of a bored pile structure in bridge engineering, in particular to a construction method of a steel casing of a bored pile body in a deep water foundation and a bare rock environment.
Background
With the rapid development of economy and society in China, the scale of infrastructure construction is continuously increased, and the construction of bridges is continuously advancing to deepwater estuary areas and ocean areas. In a general water area environment, the traditional bored pile construction adopts a thin-wall circular steel tube as a steel casing, the steel casing is placed downwards through a floating crane, and then a water boring platform is used for boring; however, in the case of an inclined rock stratum with bare rock geology and hard rock strength, the following problems are caused by the conventional construction method:
(1) after the pure steel casing is placed down, the steel casing cannot be self-stabilized, cannot resist the wind and wave environment and cannot be drilled;
(2) for deep water foundations with depth exceeding a certain depth, if a large-diameter steel casing adopts a simple steel pipe structure and the wall thickness of the casing is selected according to common specifications, the steel casing is heavy, the requirement on hoisting equipment is too high, and the steel casing is economically selected and is not an optimal scheme; if the wall thickness of the steel casing is reduced, the rigidity of the steel casing is not enough easily under the deep water foundation.
Therefore, the traditional construction mode of the bored pile and the construction of a single steel pipe pile casing structure in deep water foundation, inclined seabed and bare rock geological environment have certain limitations; under similar conditions, an auxiliary steel casing structure with high rigidity and light weight is required to be adopted for hole leading pretreatment of the seabed, and when the treated seabed has a self-stabilizing condition, a main steel casing is lowered down for drilling construction.
Disclosure of Invention
The invention aims to provide a construction method of a main steel casing of a bored pile under deep water foundation and bare rock environment, which comprises the steps of utilizing an auxiliary steel casing to pretreat a seabed, conducting drilling after chiseling, creating embedding conditions of the main steel casing, then lowering the main steel casing, grouting and anchoring, and finally conducting bored pile construction on a bored platform.
The purpose of the invention is realized as follows:
a construction method of a main steel casing of a bored pile under deep water foundation and bare rock environment is characterized by comprising the following steps: the construction steps are as follows:
(1) pile driving barge positioning and auxiliary steel casing lowering: arranging a guide platform for fixing the auxiliary steel casing on the piling ship, driving to a designed pile position, anchoring and positioning, and lowering the auxiliary steel casing to the surface of the seabed from the guide platform by adopting a floating crane;
(2) preliminary pile stabilizing: a hydraulic impact hammer is adopted for tapping lightly, so that the bottom opening of the auxiliary steel casing is stably supported on the rock surface (influenced by the inclined rock surface, in the process, only part of the area of the bottom of the auxiliary steel casing is supported on the rock surface);
(3) and (3) seabed chiseling treatment: the method comprises the following steps that a down-the-hole hammer is adopted, the sea bed surface is chiseled in the auxiliary steel casing, the auxiliary steel casing is lifted and the position is properly adjusted in the chiseling process, the leveling area is ensured to be larger than the diameter of the auxiliary steel casing, the bottom opening of the auxiliary steel casing is conveniently and completely supported on the rock surface, and local stress is avoided;
(4) formal hole guiding: after the bottom of the auxiliary steel casing is stable, arranging a hole guiding platform on the guide platform, sequentially guiding holes in a preset steel pipe hole guiding channel in the auxiliary steel casing by adopting a down-the-hole drill, hollowing the wall of the steel casing by using bare rock, and taking the central axis surrounded by a circular ring hole formed after hollowing as the diameter of the main steel casing;
(5) lowering a main steel protective cylinder: after the hole guiding is finished, the auxiliary steel protective cylinder is lifted away, the main steel protective cylinder is placed into the finished circular hole, and before the process, double-layer guide is arranged on the guide platform and used for adjusting the precision of the main steel protective cylinder at the bottom; when the main steel casing is lowered by adopting the floating crane, a small range area which is not processed in the hole leading process of the auxiliary steel casing is slightly sunk by depending on the self weight of the main steel casing;
(6) grouting and consolidating the bottom of the protective cylinder: filling broken stones in the circular ring hole, and performing underwater grouting by using a grouting pipe to ensure that the bottom of the main steel casing and rocks are in a consolidation state, so that the phenomena of hole collapse and slurry leakage in the later period of the main steel casing are prevented;
(7) and (3) construction of a drilled pile: and (3) adopting a large-scale drilling machine to carry out working procedures of drilling, lowering a reinforcement cage, pouring concrete and the like on the main steel casing.
The steps (1) - (4) are seabed processing stages, and the steps (5) - (7) are main steel casing lowering and drilling stages.
In the step (1), an upper layer and a lower layer of horizontal restraint are required to be arranged on the guide platform to ensure that the auxiliary steel casing can resist wave and water flow loads.
In the step (4), during hole guiding, the embedding depth of the circular ring hole can ensure that the main steel casing in the later period reaches the rigid connection condition, and the diameter of the down-the-hole drill can be selected to be in a common specification according to the pile foundation precision control standard.
Before the construction of the pile foundation under the deep water foundation and the bare rock geological environment, the invention firstly adopts the auxiliary steel casing to pretreat the seabed, thus providing the self-stabilizing foundation of the main steel casing under the bare rock geological and inclined rock surface environment, then chisels the steel casing and leads the hole to create the embedding condition of the main steel casing, then puts the main steel casing down, grouts and anchors to form the embedding layer at the section, and finally carries out the construction of the drilling pile on the drilling platform. The construction method for sinking the main steel casing of the bored pile by using the auxiliary steel casing has lower requirement on the plane precision of the primary pilot hole, greatly facilitates the rapid rock entering of the auxiliary steel casing under bare rock geology, solves the embedding problem of the main steel casing under the bare rock geological environment, reduces the risk of offshore construction, and generates better economic benefit.
Drawings
FIG. 1 is a floor plan view of the present invention in a hole guiding state;
FIG. 2 is a plan view of a hole of the auxiliary steel casing of the present invention, wherein A is a center line of the main steel casing;
FIG. 3 is an elevation view of the main steel casing of the present invention being lowered and anchored;
in the figure: the pile driver comprises a guide platform 1, an auxiliary steel pile casing 2, a hole guiding platform 3, a pile driver 4, a hole guiding area 5, a main steel pile casing 6 and a circular ring hole 7.
Detailed Description
The present invention will be described in further detail with reference to the following drawings in conjunction with embodiments.
A construction method of a main steel casing of a bored pile in a deep water foundation and bare rock environment comprises the following construction steps:
(1) the pile driving barge 4 positions and the auxiliary steel casing 2 is lowered: arranging a guide platform 1 for fixing an auxiliary steel pile casing 2 on a pile driving ship 4, driving to a designed pile position for anchoring and positioning, and lowering the auxiliary steel pile casing 2 to the surface of the seabed from the guide platform 1 by adopting a floating crane (the guide platform 1 is provided with an upper layer and a lower layer of horizontal constraints to ensure that the auxiliary steel pile casing 2 resists wave and water flow loads);
(2) preliminary pile stabilizing: a hydraulic impact hammer is adopted for tapping lightly, so that the bottom opening of the auxiliary steel casing 2 is stably supported on the rock surface (influenced by the inclined rock surface, in the process, only part of the area of the bottom of the auxiliary steel casing 2 is supported on the rock surface);
(3) and (3) seabed chiseling treatment: adopting a down-the-hole hammer, chiseling the sea bed surface in the auxiliary steel casing 2, hoisting the auxiliary steel casing 2 and properly adjusting the position in the chiseling process, ensuring that the leveled hole guiding area 5 is larger than the diameter of the auxiliary steel casing 2, facilitating the whole bottom opening of the auxiliary steel casing 2 to be supported on the rock surface, and avoiding local stress;
(4) formal hole guiding: after the bottom of the auxiliary steel casing 2 is stable, a hole guiding platform 3 is arranged on the guide platform 1, a down-the-hole drill is adopted to sequentially guide holes in a hole guiding channel inside the auxiliary steel casing 2, the wall of the steel casing is hollowed out by bare rock, and the central axis surrounded by a circular hole 7 is the diameter of the main steel casing 6;
the embedding depth of the lead hole can ensure that the auxiliary steel casing 2 can reach the rigid connection condition, and the diameter of the down-the-hole drill can select the common specification according to the pile foundation precision control standard;
(5) lowering the main steel casing 6: after drilling is finished, the auxiliary steel protective cylinder 2 is lifted away, the main body steel protective cylinder 6 is placed into the finished circular ring hole 7, and the precision of the main body steel protective cylinder 6 at the bottom is adjusted through double-layer guiding arranged on the guiding platform 1; when the main steel casing 6 is lowered by adopting the floating crane, the main steel casing 6 is lightly knocked to sink by the dead weight of the small-range area which is not processed in the hole leading process of the auxiliary steel casing 2;
(6) grouting and consolidating the bottom of the protective cylinder: broken stones are filled in the circular ring holes 7, and underwater grouting is carried out by adopting a grouting pipe, so that the bottom of the main steel casing 6 is ensured to be in a solidified state, and the phenomena of hole collapse and slurry leakage in the later period of the main steel casing are prevented;
(7) and (3) construction of a drilled pile: and (3) adopting a large-scale drilling machine to carry out working procedures of drilling the main steel casing 6, lowering a reinforcement cage, pouring concrete and the like.
The steps (1) - (4) are seabed processing stages, and the steps (5) - (7) are descending and drilling stages of the main steel casing 6.
Claims (5)
1. A construction method of a main steel casing of a bored pile under deep water foundation and bare rock environment is characterized by comprising the following steps: the construction steps are as follows:
(1) pile driving barge positioning and auxiliary steel casing lowering: arranging a guide platform for fixing the auxiliary steel casing on the piling ship, driving to a designed pile position, anchoring and positioning, and lowering the auxiliary steel casing to the surface of the seabed from the guide platform by adopting a floating crane;
(2) preliminary pile stabilizing: a hydraulic impact hammer is adopted for lightly hammering to ensure that the bottom opening of the auxiliary steel casing is stably supported on the rock surface; influenced by the inclined rock face, in the process, the bottom of the auxiliary steel casing can be supported on the rock face only in partial area;
(3) and (3) seabed chiseling treatment: the method comprises the following steps that a down-the-hole hammer is adopted, the sea bed surface is chiseled in the auxiliary steel casing, the auxiliary steel casing is lifted and the position is properly adjusted in the chiseling process, the leveling area is ensured to be larger than the diameter of the auxiliary steel casing, the bottom opening of the auxiliary steel casing is conveniently and completely supported on the rock surface, and local stress is avoided;
(4) formal hole guiding: after the bottom of the auxiliary steel casing is stable, arranging a hole guiding platform on the guide platform, sequentially guiding holes in a preset steel pipe hole guiding channel in the auxiliary steel casing by adopting a down-the-hole drill, hollowing the wall of the steel casing by using bare rock, and taking the central axis surrounded by a circular ring hole formed after hollowing as the diameter of the main steel casing;
(5) lowering a main steel protective cylinder: after the hole guiding is finished, the auxiliary steel protective cylinder is lifted away, the main steel protective cylinder is placed into the finished circular hole, and before the process, double-layer guide is arranged on the guide platform and used for adjusting the precision of the main steel protective cylinder at the bottom; when the main steel casing is lowered by adopting the floating crane, a small range area which is not processed in the hole leading process of the auxiliary steel casing is slightly sunk by depending on the self weight of the main steel casing;
(6) grouting and consolidating the bottom of the protective cylinder: filling broken stones in the circular ring hole, and performing underwater grouting by using a grouting pipe to ensure that the bottom of the main steel casing reaches a consolidation state, so as to prevent the phenomena of hole collapse and slurry leakage in the later period of the main steel casing;
(7) and (3) construction of a drilled pile: and (3) adopting a large-scale drilling machine to carry out the working procedures of drilling the main steel protective cylinder, lowering the reinforcement cage and pouring concrete.
2. The construction method of the main steel casing of the bored pile in the deep water foundation and bare rock environment according to claim 1, characterized in that: the steps (1) - (4) are seabed processing stages, and the steps (5) - (7) are main steel casing lowering and drilling stages.
3. The construction method of the main steel casing of the bored pile in the deep water foundation and bare rock environment according to claim 1, characterized in that: in the step (1), an upper layer and a lower layer of horizontal restraint are required to be arranged on the guide platform to ensure that the auxiliary steel casing can resist wave and water flow loads.
4. The construction method of the main steel casing of the bored pile in the deep water foundation and bare rock environment according to claim 1, characterized in that: in the step (4), during hole guiding, the embedding depth of the circular ring hole can ensure that the main steel casing in the later period reaches the rigid connection condition, and the diameter of the down-the-hole drill can be selected to be in a common specification according to the pile foundation precision control standard.
5. The construction method of the main steel casing of the bored pile in the deep water foundation and bare rock environment according to claim 1, characterized in that: in the steps (1) - (4), an auxiliary steel casing is required, and the auxiliary steel casing has enough rigidity and strength to meet the requirements of deep water environment hole guiding construction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111500180.6A CN114215049A (en) | 2021-12-09 | 2021-12-09 | Construction method for main steel casing of bored pile under deep water foundation and bare rock environment |
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| CN202111500180.6A CN114215049A (en) | 2021-12-09 | 2021-12-09 | Construction method for main steel casing of bored pile under deep water foundation and bare rock environment |
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| CN114215049A true CN114215049A (en) | 2022-03-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115787638A (en) * | 2022-12-13 | 2023-03-14 | 保利长大工程有限公司 | Anchoring method for pile foundation casing of inclined rock face |
| CN115961626A (en) * | 2022-12-08 | 2023-04-14 | 保利长大工程有限公司 | Underwater pile foundation casing anchoring method |
| CN116556326A (en) * | 2023-05-11 | 2023-08-08 | 中交第一航务工程局有限公司 | Construction method of bored pile in deep water |
| CN116676964A (en) * | 2023-07-27 | 2023-09-01 | 中国建筑第六工程局有限公司 | Bare rock pile foundation construction method under tidal action |
| CN116856408A (en) * | 2023-09-04 | 2023-10-10 | 中交第一航务工程局有限公司 | Sinking method of steel casing suitable for deepwater bare rock area |
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Cited By (6)
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| CN116676964A (en) * | 2023-07-27 | 2023-09-01 | 中国建筑第六工程局有限公司 | Bare rock pile foundation construction method under tidal action |
| CN116856408A (en) * | 2023-09-04 | 2023-10-10 | 中交第一航务工程局有限公司 | Sinking method of steel casing suitable for deepwater bare rock area |
| CN116856408B (en) * | 2023-09-04 | 2023-11-07 | 中交第一航务工程局有限公司 | Sinking method of steel casing suitable for deepwater bare rock area |
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Application publication date: 20220322 |