CN115059090A - Micro-disturbance combined foundation pit supporting wall and construction method thereof - Google Patents
Micro-disturbance combined foundation pit supporting wall and construction method thereof Download PDFInfo
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- CN115059090A CN115059090A CN202210758073.1A CN202210758073A CN115059090A CN 115059090 A CN115059090 A CN 115059090A CN 202210758073 A CN202210758073 A CN 202210758073A CN 115059090 A CN115059090 A CN 115059090A
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- steel pipe
- pipe pile
- pile
- foundation pit
- grouting
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- 238000010276 construction Methods 0.000 title claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 70
- 239000010959 steel Substances 0.000 claims abstract description 70
- 239000002689 soil Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000003068 static effect Effects 0.000 claims abstract description 9
- 238000003780 insertion Methods 0.000 claims abstract description 7
- 230000037431 insertion Effects 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 29
- 239000004568 cement Substances 0.000 claims description 17
- 230000009191 jumping Effects 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002411 adverse Effects 0.000 abstract description 3
- 238000003466 welding Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 2
- 238000007569 slipcasting Methods 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000003831 antifriction material Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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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
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
-
- 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
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a micro-disturbance combined foundation pit supporting wall and a construction method thereof. During construction, the steel pipe pile with sharp bottom is inserted and pulled out in a static rotation mode, so that adverse effects on the surrounding environment during pressing in the steel pipe pile in a conventional vibration mode can be avoided, and soil cores in the steel pipe pile can be prevented from being brought out together; welding a steel pipe on the inner side of the steel pipe pile to form a grouting hole, and inserting a steel pipe with a closed bottom end into the grouting hole to ensure that the grouting hole is not blocked by soil during the insertion process; before the steel pipe pile is pulled out, the steel pipe in the grouting hole is taken out, the grouting pipe is inserted, the grouting is carried out while the steel pipe pile is pulled out, gaps left when the steel pipe pile is pulled out can be fully filled, and the disturbance of the surrounding environment caused by the collapse of soil in the gaps can be prevented. The invention can control the influence of construction on the surrounding environment while ensuring the safety of the foundation pit.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering foundation pit supporting, and particularly relates to a micro-disturbance combined foundation pit supporting wall and a construction method thereof.
Background
In recent years, along with the development of economy, the progress of society and the acceleration of urbanization process, underground space is continuously developed and built, and a large number of foundation pit projects are developed. At present, the types of foundation pit supporting forms are more, and precast piles, cast-in-situ bored piles, steel pipe piles and the like are widely applied to foundation pit support systems. The excavation unloading of the soil body in the pit can cause the deformation of the peripheral soil body, and the construction of the enclosure structure can also have little influence on the peripheral soil body. For example: the soil squeezing effect of the precast pile sinking can generate larger disturbance to the surrounding soil body, the waste slurry of the cast-in-situ bored pile can pollute the surrounding environment, the steel pipe pile can generate adverse effect to the surrounding environment only when being pressed in by vibration, and the disturbance to the soil body is further enlarged because the soil body in the steel pipe pile is taken out when being pulled out.
However, the construction (structure) of subway tunnels, municipal pipe network facilities and the like in cities has high requirements on deformation control, which requires that the disturbance of the construction of adjacent foundation pit projects on the surrounding soil body is reduced, thereby reducing the influence on the surrounding sensitive construction (structure).
Therefore, there is a need to develop a micro-disturbance combined type foundation pit supporting wall and a construction method thereof, which can control the influence of construction on the surrounding environment under the condition of ensuring the safety of the foundation pit.
Disclosure of Invention
The invention aims to provide a combined foundation pit supporting wall capable of reducing disturbance of a supporting structure construction process on peripheral soil and a construction method thereof. According to the invention, the steel pipe piles and the cement mixing piles are arranged at intervals to form a combined supporting structure for retaining soil and stopping water by using the steel pipe piles with high rigidity. The steel pipe pile with the sharp bottom is inserted in a static rotation mode, adverse effects on the surrounding environment in the process of pressing the steel pipe pile in a conventional vibration mode are avoided, the steel pipe pile is extracted in the same static rotation mode during recovery, and the soil core in the steel pipe pile is prevented from being brought out together.
A construction method of a micro-disturbance combined foundation pit supporting wall comprises the following steps:
the method comprises the following steps: and (5) manufacturing the steel pipe pile. The lower end of the steel pipe pile is sharpened before the steel pipe pile is inserted; welding a steel pipe on the inner side of the steel pipe pile to form a grouting hole, and inserting a steel pipe with a closed bottom end into the grouting hole to ensure that the grouting hole is not blocked by soil during the insertion process; and an antifriction agent is coated on the steel pipe pile to reduce resistance during insertion and extraction and reduce disturbance to a soil body.
Step two: and (5) constructing a cement mixing pile. And (5) constructing the cement mixing pile according to the design requirement, and ensuring that all technical parameters meet the requirement. The cement mixing pile can be a single-shaft mixing pile, a double-shaft mixing pile and a three-shaft mixing pile.
Step three: and inserting the steel pipe pile. And (3) inserting the steel pipe pile with the sharp bottom in a static rotation mode within 20 minutes after the construction of the cement mixing pile is finished, and ensuring that the centering deviation is less than 10mm and the verticality deviation is less than 1% in the inserting process.
Step four: and (5) pulling out the steel pipe pile. After the foundation pit earthwork is backfilled, the steel pipe pile is still pulled out in a static rotation mode, so that the soil core in the steel pipe is prevented from being brought out, and the micro-disturbance to the surrounding environment is realized. Before pulling out, take out the downthehole steel pipe of slip casting to insert the slip casting pipe in the slip casting hole, the steel-pipe pile promotes to pull out the slip casting simultaneously, and in time fully fills the space that leaves when pulling out the steel-pipe pile, and prevents that the soil body from collapsing in the space and arousing the disturbance of all ring edge borders, according to actual control slip casting pressure during the slip casting, avoids causing the influence to all ring edge borders. During the pulling and recovering period of the steel pipe pile, the monitoring needs to be enhanced, interval jumping pulling-out is adopted (one jumping pulling-one to three jumping pulling-one and the like are adopted), and the pulling-out sequence and speed are adjusted and controlled in time according to settlement monitoring data.
The invention has the beneficial effects that:
1. the construction method can effectively reduce the disturbance of the construction process of the supporting structure to the soil body and the influence to the surrounding environment.
2. The combined micro-disturbance supporting wall designed by the invention adopts a form that the steel pipe piles and the cement mixing piles are arranged at intervals, the stress is reasonable, and the construction process is simple and convenient.
3. The invention has less environmental pollution, can be recycled after being recovered, and has the characteristics of economy, environmental protection.
4. According to the invention, the grouting pipe is inserted into the grouting hole, so that the grouting pipe can be pulled out fully along with the rotation of the steel pipe pile, the gap when the steel pipe pile is pulled out is effectively filled in time, and the disturbance of the surrounding environment caused by the collapse of the soil body in the gap is prevented.
Drawings
FIG. 1 is a top view of a steel pipe pile;
fig. 2 is a top view of a perturbation combination type foundation pit supporting wall according to the present invention.
Wherein, 1 is the steel-pipe pile, 2 is unipolar stirring stake, 3 is biax stirring stake, 4 is triaxial stirring stake, 5 is the slip casting hole.
Detailed Description
The invention relates to a construction method of a micro-disturbance combined foundation pit supporting wall, which specifically comprises the following steps:
the method comprises the following steps: and (4) manufacturing the steel pipe pile 1. The lower end of the steel pipe pile 1 is sharpened before insertion; welding a steel pipe to the inner side of the steel pipe pile 1 to form a grouting hole 5 (as shown in figure 1), and inserting a steel pipe with a closed bottom end into the grouting hole 5 to ensure that the grouting hole 5 is not blocked by soil during the insertion process; and (3) coating a friction reducer on the steel pipe pile 1 to reduce resistance during insertion and extraction and reduce disturbance to a soil body.
Step two: and (5) constructing a cement mixing pile. And (5) constructing the cement mixing pile according to the design requirement, and ensuring that all technical parameters meet the requirement. The cement mixing pile may be a single-shaft mixing pile 2, a double-shaft mixing pile 3 and a three-shaft mixing pile 4.
Step three: inserting the steel pipe pile 1. And (3) inserting the steel pipe pile 1 with the sharp bottom in a static rotation mode within 20 minutes after the construction of the cement mixing pile is finished, and ensuring that the centering deviation is less than 10mm and the verticality deviation is less than 1% in the inserting process.
Step four: and (4) pulling out the steel pipe pile 1. After the foundation pit earthwork is backfilled, the steel pipe pile 1 is still pulled out in a static rotation mode, so that the soil core in the steel pipe is prevented from being brought out, and the micro-disturbance to the surrounding environment is realized. Before the steel pipe is pulled out, the steel pipe in the grouting hole 5 is taken out, the grouting pipe is inserted into the grouting hole 5, the steel pipe pile 1 is lifted out and grouted simultaneously, so that a gap left when the steel pipe pile 1 is pulled out is fully filled, the disturbance of the surrounding environment caused by the collapse of a soil body in the gap is prevented, and the influence on the surrounding environment is avoided according to the actual grouting pressure during grouting. During the pulling and recovery period of the steel pipe pile 1, the monitoring needs to be enhanced, alternate jumping pulling (one jumping pulling to three jumping pulling is adopted, and the like) is adopted, and the pulling sequence and speed are adjusted and controlled in time according to settlement monitoring data.
Fig. 2 shows a perturbation combination type foundation pit supporting wall prepared by the construction method, which comprises steel pipe piles 1 and cement mixing piles which are sequentially arranged at intervals. The cement mixing pile can be a single-shaft mixing pile 2, a double-shaft mixing pile 3 and a three-shaft mixing pile 4.
Claims (4)
1. A construction method of a micro-disturbance combined foundation pit supporting wall is characterized by comprising the following steps:
step one, manufacturing a steel pipe pile: the lower end of the steel pipe pile is sharpened, a steel pipe is welded on the inner side of the steel pipe pile to form a grouting hole, and the steel pipe with the closed bottom end is inserted into the grouting hole to ensure that the grouting hole is not blocked by soil during the insertion process;
step two, cement mixing pile construction: constructing a cement mixing pile according to design requirements, wherein the cement mixing pile is a single-shaft mixing pile, a double-shaft mixing pile or a three-shaft mixing pile;
step three, inserting the steel pipe pile: inserting the steel pipe pile in a static rotation mode within 20 minutes after the construction of the cement mixing pile is finished, wherein the centering deviation is ensured to be less than 10mm and the verticality deviation is ensured to be less than 1% in the inserting process;
step four, pulling out the steel pipe pile: taking out the steel pipe in the grouting hole, inserting a grouting pipe into the grouting hole, pulling out the steel pipe pile in a static rotation mode, lifting and pulling out the steel pipe pile while grouting, and fully filling a gap left when the steel pipe pile is pulled out; during the pulling and recovery period of the steel pipe pile, the monitoring needs to be enhanced, the steel pipe pile is pulled out at intervals, and the pulling sequence and speed are adjusted and controlled in time according to settlement monitoring data.
2. The construction method of the perturbation combination type foundation pit supporting wall according to the claim 1, wherein in the first step, a friction reducer is coated on the steel pipe pile.
3. The construction method of the micro-disturbance combination type foundation pit supporting wall according to claim 1, wherein the interval jumping and pulling out is as follows: one for one to three for one.
4. A micro-disturbance combined foundation pit supporting wall is prepared by the construction method according to any one of claims 1-3 and is characterized by comprising steel pipe piles and cement mixing piles which are sequentially arranged at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210758073.1A CN115059090A (en) | 2022-06-29 | 2022-06-29 | Micro-disturbance combined foundation pit supporting wall and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210758073.1A CN115059090A (en) | 2022-06-29 | 2022-06-29 | Micro-disturbance combined foundation pit supporting wall and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115059090A true CN115059090A (en) | 2022-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210758073.1A Pending CN115059090A (en) | 2022-06-29 | 2022-06-29 | Micro-disturbance combined foundation pit supporting wall and construction method thereof |
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| Country | Link |
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| CN (1) | CN115059090A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202559361U (en) * | 2012-04-09 | 2012-11-28 | 东南大学 | Precast high strength concrete thin-wall steel pipe pile foundation pit supporting structure |
| CN203080551U (en) * | 2013-02-06 | 2013-07-24 | 上海城地建设股份有限公司 | Vertical building envelope comprising occlusive cast-in-place piles and mixing piles |
| CN108677927A (en) * | 2018-06-21 | 2018-10-19 | 上海坚实地基基础工程有限公司 | One kind, which blocks water, is engaged steel-pipe pile |
| JP2019049131A (en) * | 2017-09-10 | 2019-03-28 | 佐伯 英一郎 | Pile pulling out method |
| CN210288408U (en) * | 2019-04-01 | 2020-04-10 | 宁波冶金勘察设计研究股份有限公司 | Foundation pit supporting structure |
| CN111764404A (en) * | 2020-07-22 | 2020-10-13 | 湖南科技学院 | Partially recyclable secant pile supporting structure and construction method |
-
2022
- 2022-06-29 CN CN202210758073.1A patent/CN115059090A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202559361U (en) * | 2012-04-09 | 2012-11-28 | 东南大学 | Precast high strength concrete thin-wall steel pipe pile foundation pit supporting structure |
| CN203080551U (en) * | 2013-02-06 | 2013-07-24 | 上海城地建设股份有限公司 | Vertical building envelope comprising occlusive cast-in-place piles and mixing piles |
| JP2019049131A (en) * | 2017-09-10 | 2019-03-28 | 佐伯 英一郎 | Pile pulling out method |
| CN108677927A (en) * | 2018-06-21 | 2018-10-19 | 上海坚实地基基础工程有限公司 | One kind, which blocks water, is engaged steel-pipe pile |
| CN210288408U (en) * | 2019-04-01 | 2020-04-10 | 宁波冶金勘察设计研究股份有限公司 | Foundation pit supporting structure |
| CN111764404A (en) * | 2020-07-22 | 2020-10-13 | 湖南科技学院 | Partially recyclable secant pile supporting structure and construction method |
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