CN111119180A - Underground pile foundation clearing construction method in complex environment - Google Patents
Underground pile foundation clearing construction method in complex environment Download PDFInfo
- Publication number
- CN111119180A CN111119180A CN201911360470.8A CN201911360470A CN111119180A CN 111119180 A CN111119180 A CN 111119180A CN 201911360470 A CN201911360470 A CN 201911360470A CN 111119180 A CN111119180 A CN 111119180A
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- Prior art keywords
- pile
- casing
- pile foundation
- hole
- foundation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/0021—Mortar
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of building construction, in particular to a construction method for removing an underground pile foundation in a complex environment, which comprises the following steps of carrying out pile foundation bearing platform breaking, removing a pile head, and measuring the center position of a pile hole according to the pile head; installing a drilling machine above the pile hole, and aligning a drill bit of the drilling machine with the center position of the pile hole in the step 1; pressing the pile casing into the pile foundation, starting a drilling machine to break the pile foundation concrete, wherein the breaking depth does not exceed the pressing depth of the pile casing; cleaning pile foundation reinforcing steel bars and slag blocks remained in the pile casing; measuring the depth of the pile hole after cleaning; and placing a guide pipe with corresponding depth in the pile hole according to the measured depth of the pile hole, pouring mortar in the guide pipe, simultaneously pulling out the pile casing and the guide pipe in the pile hole in the pouring process, and enabling the lower ends of the pile casing and the guide pipe to be positioned below a pouring surface in the pulling-out process. The surrounding structure buildings are not affected in the pile foundation breaking process, and the pile hole structure after backfilling is stable.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method for removing an underground pile foundation in a complex environment.
Background
With the rapid development of domestic economy, projects such as subway tunnels, underground structures, old city reconstruction, bridge reconstruction and extension projects are continuously increased, old pile foundations are often required to be removed, and most pile foundations are difficult to remove due to the fact that the distance between the pile foundations and important underground building structures is short.
The currently commonly adopted pile foundation removing method comprises the following steps: 1. pressing the sleeve into the ground by adopting a full-circle rotary drill, sleeving the pile body, inserting a steel wedge hammer to tightly clamp the pile body and the inner side of the sleeve, starting the rotary drill to rotate the sleeve, and hanging out the pile body after the pile body is twisted off; 2. adopting an impact hammer to carry out impact pile breaking treatment; 3. and adopting manual hole digging to break. The methods can not meet the construction requirements under the conditions of large diameter of the pile body, thick reinforcing steel bars of the pile body, large burial depth, being positioned in a viscous or sandy stratum and being close to an important underground building in a complex environment, and easily cause the collapse of the surrounding building in the process of removing the pile foundation.
In summary, there is a need for a technical solution to solve the technical problem that the prior art is limited by complex environmental conditions during the process of removing the pile foundation, which is likely to cause the collapse of the building around the pile body.
Disclosure of Invention
The invention aims to: aiming at the technical problem that the prior art is limited by complex environmental conditions in the process of clearing the pile foundation, which easily causes the collapse of the building structure around the pile body, the underground pile foundation clearing construction method under the complex environment is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a construction method for removing underground pile foundation in complex environment includes such steps as,
step 4, cleaning the pile casing, and cleaning pile foundation reinforcing steel bars and slag blocks remained in the pile casing;
step 5, measuring pile holes, and measuring the depth of the pile holes after cleaning;
and 6, backfilling the pile hole, namely putting a guide pipe with corresponding depth in the pile hole according to the depth of the pile hole measured in the step 5, pouring mortar in the guide pipe, simultaneously pulling out the pile casing and the guide pipe in the pile hole in the pouring process, and enabling the lower ends of the pile casing and the guide pipe to be positioned below a pouring surface in the pulling-out process.
The invention relates to a construction method for removing an underground pile foundation in a complex environment, which is characterized in that in the construction process of the method, the breaking of the pile foundation and the backfilling of a pile hole are always carried out under the protection of a pile casing, the influence on a peripheral soil body is small, the peripheral building is not influenced in the process of breaking the pile foundation, a guide pipe is arranged in the pile hole in the process of backfilling the pile hole, mortar is poured, the pile casing and the guide pipe are synchronously pulled out, the pile pulling and backfilling work is completed, the phenomenon that the solidification effect of the mortar is influenced due to the fact that the mortar is mixed with a large amount of water in the soil body is avoided, and the structure.
As a preferable scheme of the invention, the step 2 further comprises a step 2.1 of installing a positioning steel plate, installing the positioning steel plate on the road base plate around the pile hole before installing a drilling machine, and installing the drilling machine on the positioning steel plate. Before the drilling machine is installed, positioning steel plates for reinforcing the stability of the structure of the surrounding soil body are arranged around the pile hole, so that the installation stability of the drilling machine is enhanced, and the safety guarantee is improved for subsequent operations such as pile foundation breaking, pile hole backfilling and the like.
In a preferred embodiment of the present invention, in step 3, the pile foundation is removed by using drill bits with at least two diameters. The drill bit that uses minor diameter earlier breaks for the first time in to the pile foundation, uses major diameter again to carry out the second time to remaining pile foundation and breaks, avoids once only breaking to bring the too big and influence the stable problem of soil body of effort.
As a preferable scheme of the present invention, in the step 4, a grab bucket is adopted to remove pile head reinforcing steel bars and slag blocks remaining in the pile casing.
In a preferred embodiment of the present invention, in the step 5, during the process of pulling out the casing and the guide pipe, the lower end of the casing is located at least 1m below the mortar casting surface, and the lower end of the guide pipe is located at least 50cm below the mortar casting surface.
As a preferred embodiment of the present invention, in step 1, the central position of the pile hole is determined by adopting a line-laying positioning manner. Straightening two non-coincident positioning lines in the diameter direction of the pile hole, and determining the center position of the pile hole according to the intersection point of the two positioning lines.
In a preferred embodiment of the present invention, in step 3, the casing and the pile foundation are coaxially provided.
In a preferred embodiment of the present invention, a gap is provided between the casing and the pile foundation.
As a preferable scheme of the invention, the casing and the conduit are of a sectional structure.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention relates to a construction method for removing an underground pile foundation in a complex environment, which is characterized in that in the construction process of the method, the breaking of the pile foundation and the backfilling of a pile hole are always carried out under the protection of a pile casing, the influence on a peripheral soil body is small, the influence on the peripheral building in the process of breaking the pile foundation is ensured to be not influenced, a guide pipe is arranged in the pile hole in the process of backfilling the pile hole, mortar is poured, the pile casing and the guide pipe are synchronously pulled out, the pile pulling and backfilling work is completed, the phenomenon that the solidification effect of the mortar is influenced due to the large amount of mixing of the mortar and water in the soil body is avoided;
2. before the drilling machine is installed, positioning steel plates for reinforcing the stability of the surrounding soil body structure are arranged around the pile holes, so that the installation stability of the drilling machine is enhanced, and the safety guarantee is improved for subsequent operations such as pile foundation breaking, pile hole backfilling and the like;
3. the drill bit that uses minor diameter earlier breaks for the first time in to the pile foundation, uses major diameter again to carry out the second time to remaining pile foundation and breaks, avoids once only breaking to bring the too big and influence the stable problem of soil body of effort.
Drawings
FIG. 1 is a process flow diagram of the construction method for removing underground pile foundation in complex environment;
FIG. 2 is a construction schematic diagram of the underground pile foundation clearing construction method under a complex environment of the invention;
the labels in the figure are: 1-pile foundation, 2-pile casing and 3-drilling machine.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1 and 2, the invention relates to a method for removing underground pile foundation in complex environment, which comprises the following steps,
step 4, cleaning the pile casing, namely cleaning the pile foundation 1 steel bars and the slag blocks remained in the pile casing 2, and cleaning the pile head steel bars and the slag blocks remained in the pile casing 2 by adopting a grab bucket;
step 5, measuring pile holes, and measuring the depth of the pile holes after cleaning;
and 6, backfilling the pile hole, namely placing a guide pipe with a corresponding depth in the pile hole according to the depth of the pile hole measured in the step 5, pouring mortar in the guide pipe, simultaneously pulling out the pile casing 2 and the guide pipe in the pile hole in the pouring process, enabling the lower ends of the pile casing 2 and the guide pipe to be located below a pouring surface in the pulling-out process, wherein the model of the mortar is M5 in the pouring process, in the pulling-out process of the pile casing 2 and the guide pipe, the lower end of the pile casing 2 is located at least 1M below the mortar pouring surface, and the lower end of the guide pipe is located at least 50cm below the mortar pouring surface.
In the step 1, the central position of the pile hole is determined by adopting a paying-off positioning mode, two non-coincident positioning lines are straightened in the diameter direction of the pile hole, and the central position of the pile hole is determined according to the intersection point of the two positioning lines.
Further, step 2 still includes step 2.1, the installation location steel sheet, before 3 installations of rig, installs the location steel sheet on the road bed board around the stake hole, rig 3 installs on the location steel sheet, before installation rig 3, sets up around the stake hole and is used for strengthening the location steel sheet of soil body stable in structure around, has strengthened rig 3 installation stability, has improved the safety guarantee for operations such as subsequent pile foundation 1 breaks away, stake hole backfill.
Furthermore, in the step 3, at least two kinds of drill bits with different diameters are adopted to respectively remove the pile foundation 1, the drill bit with the smaller diameter is firstly used for carrying out primary removal on the pile foundation 1, and then the drill bit with the larger diameter is used for carrying out secondary removal on the residual pile foundation 1, so that the problems that the acting force is too large and the soil stability is influenced due to the primary removal are solved; specifically, when the diameter of pile hole is 1200mm, in step 3, the diameter of casing 2 is 1600mm, adopts the drill bit that the diameter is 600mm and 1000mm to clear away pile foundation 1 respectively.
In conclusion, in the construction process of the method, the pile foundation 1 is broken and the pile hole is backfilled all the time under the protection of the pile casing 2, the influence on the surrounding soil body is small, the surrounding buildings are not affected in the process of breaking the pile foundation 1, the guide pipe is arranged in the pile hole in the process of backfilling the pile hole, mortar is poured, the pile casing 2 and the guide pipe are synchronously pulled out, pile pulling and backfilling are completed, the mortar solidification effect is prevented from being affected due to the fact that a large amount of water in the mortar and the soil body is mixed, and the structure of the backfilled pile hole is stable.
Example 2
In the embodiment, the difference from embodiment 1 is that the casing 2 and the guide pipe both adopt a sectional structure, and when the buried depth of the pile foundation 1 is large, the casing 2 and the guide pipe of a single-section structure cannot meet the support around the pile foundation 1, and the depth of the pile foundation 1 and the lengths of the casing 2 and the guide pipe determine the number of sections of the casing 2 and the guide pipe which need to be run in.
In the step 3 and the step 4, the pile foundation 1 is broken and the pile casing 2 is cleaned, the first section of pile casing 2 is pressed into the pile foundation 1, the second end casing 2 is pressed into the first section of pile casing 2 after the pile foundation 1 in the first section of pile casing 2 is broken and cleaned, the second section of pile casing 2 is broken and cleaned, and the number of the sections of the pile casing 2 to be pressed is determined according to the depth of the pile foundation 1 and the length of the pile casing 2; and 6, backfilling the pile hole, and pulling out the pile casing section by section from the upper end according to the height of the pouring surface.
And 6, determining the number of sections of the inner conduit which is inserted into the pile hole according to the depth of the pile hole and the length of the conduit which are measured in the step 5, and extracting the conduit according to the height of the pouring surface in the extracting process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A construction method for removing underground pile foundation in complex environment is characterized by comprising the following steps,
step 1, positioning a pile hole, carrying out pile cap breaking on a pile foundation, cleaning a pile head, and measuring the center position of the pile hole according to the pile head;
step 2, installing a drilling machine, and installing the drilling machine above the pile hole to enable a drill bit of the drilling machine to be aligned with the center position of the pile hole in the step 1;
step 3, breaking the pile foundation (1), pressing the pile casing (2) on the pile foundation (1), starting a drilling machine (3) to break the concrete of the pile foundation (1), wherein the breaking depth is not more than the pressing-in depth of the pile casing (2);
step 4, cleaning the pile casing (2), and cleaning the residual reinforcing steel bars and slag blocks of the pile foundation (1) in the pile casing (2);
step 5, measuring pile holes, and measuring the depth of the pile holes after cleaning;
and 6, backfilling the pile hole, namely putting a guide pipe with corresponding depth in the pile hole according to the depth of the pile hole measured in the step 5, pouring mortar in the guide pipe, simultaneously pulling out the pile casing (2) and the guide pipe in the pile hole in the pouring process, and enabling the lower ends of the pile casing (2) and the guide pipe to be positioned below a pouring surface in the pulling-out process.
2. A complex environment underground pile foundation clearing construction method according to claim 1, characterized in that the step 2 further comprises the step 2.1 of installing a positioning steel plate, installing the positioning steel plate on the road base plate around the pile hole before installing the drilling machine (3), and installing the drilling machine (3) on the positioning steel plate.
3. The method for removing underground pile foundations in complex environments as claimed in claim 1, wherein in the step 3, the pile foundations (1) are removed by using drill bits with at least two diameters respectively.
4. The method for removing the underground pile foundation in the complex environment according to claim 1, wherein in the step 4, a grab bucket is used for removing pile head reinforcing steel bars and slag blocks remained in the pile casing (2).
5. The complex environment underground pile foundation clearing construction method according to claim 1, wherein in the step 5, during the process of pulling out the casing (2) and the guide pipe, the lower end of the casing (2) is located at least 1m below a mortar pouring surface, and the lower end of the guide pipe is located at least 50cm below the mortar pouring surface.
6. The method for removing underground pile foundations in the complex environment as claimed in claim 1, wherein in the step 1, the center position of the pile hole is determined by adopting a line-laying positioning mode.
7. A method for removing underground pile foundation in complex environment according to claim 1, wherein in step 3, the casing (2) and the pile foundation (1) are coaxially arranged.
8. A complex environment underground pile foundation clearing construction method according to claim 7, characterized in that a gap is arranged between the casing (2) and the pile foundation (1).
9. A method for removing underground pile foundations in complex environments according to any one of claims 1 to 8, wherein the casing (2) and the conduit are of a segmented structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911360470.8A CN111119180A (en) | 2019-12-25 | 2019-12-25 | Underground pile foundation clearing construction method in complex environment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911360470.8A CN111119180A (en) | 2019-12-25 | 2019-12-25 | Underground pile foundation clearing construction method in complex environment |
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| CN111119180A true CN111119180A (en) | 2020-05-08 |
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| CN201911360470.8A Pending CN111119180A (en) | 2019-12-25 | 2019-12-25 | Underground pile foundation clearing construction method in complex environment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111877344A (en) * | 2020-06-24 | 2020-11-03 | 中煤江南建设发展有限公司 | Old pipe pile breaking method |
| CN112962603A (en) * | 2021-02-05 | 2021-06-15 | 广州市第一市政工程有限公司 | Dismantling construction process for reinforced concrete cast-in-place pile |
| CN113417287A (en) * | 2021-05-26 | 2021-09-21 | 中交二航局第三工程有限公司 | Construction method for removing underground secant pile by full-casing full-slewing drilling machine |
| CN113653052A (en) * | 2021-09-02 | 2021-11-16 | 上海建工四建集团有限公司 | Obstacle clearing construction method for large-diameter underground steel-concrete composite structure |
| WO2023061141A1 (en) * | 2021-10-13 | 2023-04-20 | 上海建工七建集团有限公司 | Pile pulling device capable of reducing soil disturbance, and method for using same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111877344A (en) * | 2020-06-24 | 2020-11-03 | 中煤江南建设发展有限公司 | Old pipe pile breaking method |
| CN112962603A (en) * | 2021-02-05 | 2021-06-15 | 广州市第一市政工程有限公司 | Dismantling construction process for reinforced concrete cast-in-place pile |
| CN113417287A (en) * | 2021-05-26 | 2021-09-21 | 中交二航局第三工程有限公司 | Construction method for removing underground secant pile by full-casing full-slewing drilling machine |
| CN113653052A (en) * | 2021-09-02 | 2021-11-16 | 上海建工四建集团有限公司 | Obstacle clearing construction method for large-diameter underground steel-concrete composite structure |
| WO2023061141A1 (en) * | 2021-10-13 | 2023-04-20 | 上海建工七建集团有限公司 | Pile pulling device capable of reducing soil disturbance, and method for using same |
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Application publication date: 20200508 |