CN111411630A - Supporting method for local deepened area in deep foundation pit - Google Patents
Supporting method for local deepened area in deep foundation pit Download PDFInfo
- Publication number
- CN111411630A CN111411630A CN202010246104.6A CN202010246104A CN111411630A CN 111411630 A CN111411630 A CN 111411630A CN 202010246104 A CN202010246104 A CN 202010246104A CN 111411630 A CN111411630 A CN 111411630A
- Authority
- CN
- China
- Prior art keywords
- steel sheet
- sheet pile
- bearing platform
- anchor cable
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
-
- 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
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
-
- 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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (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)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention relates to a supporting method of a local deepened area in a deep foundation pit; the method is characterized in that: excavating the deep foundation pit layer by layer to the designed elevation of the foundation pit base according to the design requirement, pouring a bottom cushion layer of a bearing platform of a first excavation surface after earthwork arrangement, binding reinforcing steel bars of the bearing platform, reserving a steel pipe penetrating through a prestressed anchor cable at the position of the proper elevation, and pouring concrete of the bearing platform; continuously excavating deepened area earthwork downwards and driving steel sheet piles, arranging a row of reserved holes at a position which returns 0.2m below the top of each steel sheet pile, fully welding steel crown beams at the same elevation as the reserved holes on the inner sides of the steel sheet piles, arranging prestressed anchor cable ends on the steel sheet piles, penetrating anchor cables into steel pipes pre-buried in a bearing platform through the reserved holes in the steel sheet piles, and tensioning the prestressed anchor cables to a design tension on the side of the bearing platform; and excavating earthwork in the steel sheet pile surrounding range to the design elevation of the deepened area, and pulling out the steel sheet pile after the construction of the deepened area structure is finished. Simple process principle, easy operation and implementation, low cost and quick effect.
Description
Technical Field
The invention relates to the field of foundation pit construction, in particular to a supporting method for a local deepened area in a deep foundation pit.
Background
With the rapid development of urban construction and economy in China, landmark type super high-rise buildings are built in more and more cities, which is an important measure for urban development and reasonable land development and utilization. However, the deep foundation pit construction and supporting problems of the super high-rise building are the most important and difficult parts in the super high-rise construction all the time, and particularly the supporting problem of the local deepened area at the bottom of the deep foundation pit is the most important. How to safely, economically and quickly finish the excavation and supporting problems of the area, at present, a structure which can be designed according to the original project needs to be found to improve the safety and the economical efficiency of the local excavation area.
Disclosure of Invention
The invention aims to provide a construction method, which utilizes an original structure as a part of a supporting structure to form an integral structure with a foundation cap of a first excavation surface through an anchor rope under the condition of not disturbing a soil body below the first excavation surface. The lateral stiffness of the steel sheet pile is improved, the deformation of a supporting structure of a local deepened area is controlled, and meanwhile the steel sheet pile can provide a certain water stopping effect for the deepened area.
In order to achieve the above object, the present invention is realized by:
a supporting method for a local deepened area in a deep foundation pit comprises the following steps:
step 1, integrally excavating a foundation pit to a first layer of base designed elevation, and pouring bearing platform bottom cushion layer concrete;
step 2, binding reinforcing steel bars in the bearing platform, embedding a steel pipe for penetrating a prestressed anchor cable to a design position, and pouring bearing platform concrete;
step 3, driving the steel sheet piles into a soil layer with a designed depth on the excavation surface of the first layer of the substrate according to the designed position of the local deepened area by a steel sheet pile hammering method;
step 4, after the construction of the steel sheet pile is finished, a row of reserved holes are formed in the position, returning to 0.2m below the top of the steel sheet pile, steel crown beams are fully welded at the same elevation as the reserved holes on the inner side of the steel sheet pile, and prestressed anchor cable fixing end heads are arranged on the steel crown beams; adjusting the angle of the fixed end of the anchor cable to ensure that the axis of the prestressed anchor cable is vertical to the anchor backing plate;
step 5, penetrating a prestressed anchor cable from a pre-buried steel pipe in a bearing platform through a steel sheet pile reserved hole, locking a steel sheet pile side anchor cable fixing end, arranging an anchor backing plate on the bearing platform side, adjusting the angle, tensioning the prestressed anchor cable, and locking the prestressed anchor cable to a design tensioning value;
and 6, excavating earthwork within the surrounding range of the steel sheet pile layer by adopting machinery to the bottom elevation of the deepened area, backfilling the earthwork between the steel sheet pile and the structure after constructing the structure at the part, pulling out the steel sheet pile after unloading the prestressed anchor cable, and grouting reserved steel pipe holes in the bearing platform.
The method is suitable for the situation that the height difference of the bottom elevation of the foundation pit is large, and under the condition that soil mass below a first excavation surface is not disturbed, the original structure is used as one part of a supporting structure, so that convenience is provided for accelerating the construction of the deep foundation pit of the super high-rise building.
Drawings
Fig. 1 is a plan view and a sectional view of a supporting structure when the construction method is used.
Detailed Description
The invention is further illustrated by the following specific examples.
As shown in fig. 1, a method for supporting a local deepened area in a deep foundation pit includes the following steps:
step 1, integrally excavating a foundation pit to a first layer of base designed elevation, and pouring bearing platform bottom cushion layer concrete;
step 2, binding reinforcing steel bars in the bearing platform, embedding a steel pipe for penetrating a prestressed anchor cable to a design position, and pouring bearing platform concrete;
step 3, driving the steel sheet piles into a soil layer with a designed depth on the excavation surface of the first layer of the substrate according to the designed position of the local deepened area by a steel sheet pile hammering method;
step 4, after the construction of the steel sheet pile is finished, a row of reserved holes are formed in the position, returning to 0.2m below the top of the steel sheet pile, steel crown beams are fully welded at the same elevation as the reserved holes on the inner side of the steel sheet pile, and prestressed anchor cable fixing end heads are arranged on the steel crown beams; adjusting the angle of the fixed end of the anchor cable to ensure that the axis of the prestressed anchor cable is vertical to the anchor backing plate;
step 5, penetrating a prestressed anchor cable from a pre-buried steel pipe in a bearing platform through a steel sheet pile reserved hole, locking a steel sheet pile side anchor cable fixing end, arranging an anchor backing plate on the bearing platform side, adjusting the angle, tensioning the prestressed anchor cable, and locking the prestressed anchor cable to a design tensioning value;
and 6, excavating earthwork within the surrounding range of the steel sheet pile layer by adopting machinery to the bottom elevation of the deepened area, backfilling the earthwork between the steel sheet pile and the structure after constructing the structure at the part, pulling out the steel sheet pile after unloading the prestressed anchor cable, and grouting reserved steel pipe holes in the bearing platform.
The method is suitable for the situation that the height difference of the bottom elevation of the foundation pit is large, and under the condition that soil mass below a first excavation surface is not disturbed, the original structure is used as one part of a supporting structure, so that convenience is provided for accelerating the construction of the deep foundation pit of the super high-rise building.
Claims (1)
1. A supporting method for a local deepened area in a deep foundation pit is characterized by comprising the following steps: the method comprises the following steps:
step 1, integrally excavating a foundation pit to a first layer of base designed elevation, and pouring bearing platform bottom cushion layer concrete;
step 2, binding reinforcing steel bars in the bearing platform, embedding a steel pipe for penetrating a prestressed anchor cable to a design position, and pouring bearing platform concrete;
step 3, driving the steel sheet piles into a soil layer with a designed depth on the excavation surface of the first layer of the substrate according to the designed position of the local deepened area by a steel sheet pile hammering method;
step 4, after the construction of the steel sheet pile is finished, a row of reserved holes are formed in the position, returning to 0.2m below the top of the steel sheet pile, steel crown beams are fully welded at the same elevation as the reserved holes on the inner side of the steel sheet pile, and prestressed anchor cable fixing end heads are arranged on the steel crown beams; adjusting the angle of the fixed end of the anchor cable to ensure that the axis of the prestressed anchor cable is vertical to the anchor backing plate;
step 5, penetrating a prestressed anchor cable from a pre-buried steel pipe in a bearing platform through a steel sheet pile reserved hole, locking a steel sheet pile side anchor cable fixing end, arranging an anchor backing plate on the bearing platform side, adjusting the angle, tensioning the prestressed anchor cable, and locking the prestressed anchor cable to a design tensioning value;
and 6, excavating earthwork within the surrounding range of the steel sheet pile layer by adopting machinery to the bottom elevation of the deepened area, backfilling the earthwork between the steel sheet pile and the structure after constructing the structure at the part, pulling out the steel sheet pile after unloading the prestressed anchor cable, and grouting reserved steel pipe holes in the bearing platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010246104.6A CN111411630A (en) | 2020-03-31 | 2020-03-31 | Supporting method for local deepened area in deep foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010246104.6A CN111411630A (en) | 2020-03-31 | 2020-03-31 | Supporting method for local deepened area in deep foundation pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111411630A true CN111411630A (en) | 2020-07-14 |
Family
ID=71491698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010246104.6A Pending CN111411630A (en) | 2020-03-31 | 2020-03-31 | Supporting method for local deepened area in deep foundation pit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111411630A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115142433A (en) * | 2022-07-08 | 2022-10-04 | 中国建筑第八工程局有限公司 | Foundation pit supporting structure and construction method thereof |
| CN115262568A (en) * | 2022-05-16 | 2022-11-01 | 中国建筑第八工程局有限公司 | Deepening supporting and excavating construction method based on zero-site deep foundation pit |
| CN115492128A (en) * | 2022-10-28 | 2022-12-20 | 上海市机械施工集团有限公司 | Variable cross-section ground wall supporting method at junction of standard section of foundation pit and end well |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104805828A (en) * | 2015-04-30 | 2015-07-29 | 连云港市云达建设工程有限公司 | W-shaped steel sheet pile structure |
| CN204728333U (en) * | 2015-06-24 | 2015-10-28 | 江苏省建筑科学研究院有限公司 | A kind of underwater support table foundation ditch leading truck |
| CN105804089A (en) * | 2016-03-30 | 2016-07-27 | 广东华固工程有限公司 | Locally-deepened supporting and protecting system used after original deep foundation pit is constructed and construction method of system |
| CN207331699U (en) * | 2017-06-29 | 2018-05-08 | 中国建筑第二工程局有限公司 | Pit-in-pit reinforced concrete retaining wall composite supporting structure |
| KR20180060852A (en) * | 2016-11-29 | 2018-06-07 | 보현산업개발 주식회사 | Construction method of retaining wall for underground structures with narrow edge space |
| CN109610476A (en) * | 2019-01-31 | 2019-04-12 | 上海宝钢工程咨询有限公司 | Steel pipe Larsen sheet pile precipitation building enclosure |
-
2020
- 2020-03-31 CN CN202010246104.6A patent/CN111411630A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104805828A (en) * | 2015-04-30 | 2015-07-29 | 连云港市云达建设工程有限公司 | W-shaped steel sheet pile structure |
| CN204728333U (en) * | 2015-06-24 | 2015-10-28 | 江苏省建筑科学研究院有限公司 | A kind of underwater support table foundation ditch leading truck |
| CN105804089A (en) * | 2016-03-30 | 2016-07-27 | 广东华固工程有限公司 | Locally-deepened supporting and protecting system used after original deep foundation pit is constructed and construction method of system |
| KR20180060852A (en) * | 2016-11-29 | 2018-06-07 | 보현산업개발 주식회사 | Construction method of retaining wall for underground structures with narrow edge space |
| CN207331699U (en) * | 2017-06-29 | 2018-05-08 | 中国建筑第二工程局有限公司 | Pit-in-pit reinforced concrete retaining wall composite supporting structure |
| CN109610476A (en) * | 2019-01-31 | 2019-04-12 | 上海宝钢工程咨询有限公司 | Steel pipe Larsen sheet pile precipitation building enclosure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115262568A (en) * | 2022-05-16 | 2022-11-01 | 中国建筑第八工程局有限公司 | Deepening supporting and excavating construction method based on zero-site deep foundation pit |
| CN115262568B (en) * | 2022-05-16 | 2024-04-26 | 中国建筑第八工程局有限公司 | Deepening support and excavation construction method based on zero-field deep foundation pit |
| CN115142433A (en) * | 2022-07-08 | 2022-10-04 | 中国建筑第八工程局有限公司 | Foundation pit supporting structure and construction method thereof |
| CN115492128A (en) * | 2022-10-28 | 2022-12-20 | 上海市机械施工集团有限公司 | Variable cross-section ground wall supporting method at junction of standard section of foundation pit and end well |
| CN115492128B (en) * | 2022-10-28 | 2023-11-21 | 上海市机械施工集团有限公司 | Variable cross section ground wall supporting method for junction of standard section and end well of foundation pit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111411630A (en) | Supporting method for local deepened area in deep foundation pit | |
| CN111851567A (en) | Wind power foundation newly built or expanded on soft foundation shallow covering layer and construction method thereof | |
| CN105839946A (en) | Brick-concrete structure building lifting add-layer method | |
| CN108867723B (en) | Method for correcting inclination of frame structure building and adding underground layer | |
| JP7149919B2 (en) | Improvement structure and improvement method of existing wharf | |
| CN106088120A (en) | Construction method is transferred in a kind of cofferdam | |
| CN112942377A (en) | Novel support shear-resistant structure and construction method thereof | |
| CN210106749U (en) | Counter-force structure of soft soil foundation super large section push pipe jacking operation | |
| CN110158633B (en) | Prefabricated pier slab beam type foundation of lattice type concrete wind power tower | |
| CN210439324U (en) | Prefabricated pier plate beam type foundation of lattice type concrete wind power tower | |
| CN107237342A (en) | New low pile cap foundation structure and its construction method | |
| CN106988337A (en) | Reinforcing method for reducing uneven settlement of strip-shaped shallow foundation house | |
| CN106400814A (en) | Foundation pit supporting method | |
| CN215441921U (en) | Novel support shear structure | |
| CN111197319A (en) | Multidirectional prestress prefabricated assembled beam slab foundation of wind power generation tower | |
| KR100625115B1 (en) | downward reinforced-concrete underground structure using temporary assistant columns | |
| CN112627249B (en) | Construction method for shallow foundation reinforcement | |
| CN111350193A (en) | Open type foundation pit supporting method | |
| KR100663109B1 (en) | Method for Constructing an Underground Structure Using Up-down Method | |
| CN114016534A (en) | Rock drilling anchor cable and bearing platform combined anti-seismic foundation and construction method thereof | |
| JPH1077644A (en) | Earthquake resisting pile foundation construction method | |
| JPH09100540A (en) | Man-made island ground and execution method thereof | |
| CN111894036A (en) | Construction method for additionally arranging basement in strip foundation building | |
| CN220266621U (en) | Combined foundation pile | |
| JP2005083123A (en) | Earth retaining combined wall and method for constructing earth retaining combined wall |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200714 |
|
| RJ01 | Rejection of invention patent application after publication |