CN115506405A - Semi-inverse construction method for basement structure of ultra-large deep foundation pit - Google Patents
Semi-inverse construction method for basement structure of ultra-large deep foundation pit Download PDFInfo
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- CN115506405A CN115506405A CN202211272569.4A CN202211272569A CN115506405A CN 115506405 A CN115506405 A CN 115506405A CN 202211272569 A CN202211272569 A CN 202211272569A CN 115506405 A CN115506405 A CN 115506405A
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- 238000010276 construction Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000002689 soil Substances 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000009435 building construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
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Classifications
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- 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
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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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- 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)
- Environmental & Geological Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a semi-reverse construction method of a basement structure for an oversized deep foundation pit. In the sequential construction stage, as the area of the central island area is greatly reduced compared with the area of the original deep foundation pit, a temporary horizontal inner support is not arranged, so the construction method of the invention reduces the installation and dismantling processes of the traditional temporary horizontal support of the foundation pit, can greatly improve the construction efficiency, quickens the construction progress and saves the construction period. The invention solves the problems that the horizontal support dismantling and the support changing are time-consuming and labor-consuming in the traditional foundation pit large excavation construction for an ultra-large deep foundation pit.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a semi-inverse construction method for a basement structure of an oversized deep foundation pit.
Background
For some super large foundation pits, if the construction basement structure in the deep foundation pit with the area exceeding 2 ten thousand square meters is adopted, the foundation pit is excavated in a large scale in the traditional way, the basement structure is integrally constructed after the excavation is carried out to the bottom of the foundation pit while supporting, the foundation pit is guaranteed to be stable by adopting a horizontal support, and the horizontal support is time-consuming and labor-consuming in dismantling and replacing the support.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
In order to overcome the defects in the prior art, a semi-inverse construction method for a basement structure of an ultra-large deep foundation pit is provided so as to solve the problems that horizontal support dismantling and support replacement are time-consuming and labor-consuming in the traditional foundation pit large excavation construction of the ultra-large deep foundation pit.
In order to achieve the purpose, the semi-inverse construction method of the basement structure for the ultra-large deep foundation pit comprises the following steps:
dividing a deep foundation pit into a central island region and an edge region surrounding the central island region;
constructing a support pile on the outer edge of the edge area, and constructing a support column in the edge area;
constructing a first underground structure in the central island region by a forward method in a mode of not arranging a horizontal inner support in the central island region;
in the marginal area, adopt reverse construction second underground structure in the marginal area, when being under construction second underground structure, one side of the beam slab of each layer of second underground structure connect in the corresponding one deck beam slab in position of first structure, the opposite side of the beam slab of each layer of second underground structure through trade the support beam slab support in the fender pile makes the beam slab of second underground structure conduct horizontal support in the marginal area, the support column is as vertical support in the marginal area.
And further, after the outer wall of the second underground structure is formed, earth backfilling is carried out between the outer wall and the supporting piles, and the supporting beam plates on each layer are removed.
Furthermore, when the second underground structure is constructed, a soil outlet is formed in a floor slab of the second underground structure, and the soil outlet is reinforced and plugged after the support beam plates are removed.
Further, the step of constructing the support column in the edge area includes:
pile holes are formed in the edge areas;
pouring a pile foundation in the pile hole;
constructing the supporting column on the pile foundation;
and backfilling fine sand in the gap between the support column and the pile hole.
Further, the support column is a steel pipe concrete pile.
The basement structure semi-reverse construction method for the ultra-large deep foundation pit has the advantages that the beam slab of the second underground structure is used as the horizontal support in the reverse construction stage, and the beam slab of the first underground structure in the central island area can be connected together during the construction of the minus layer and the minus layer of the second underground structure, so that the horizontal support is integrally formed. And because the outer wall (namely basement outer wall) of the second underground structure is constructed at last, the construction adopts the mode that the beam plates (short beams) are arranged on each layer of beam plate of the second underground structure for supporting so as to improve the stability. In the sequential construction stage, as the area of the central island area is greatly reduced compared with the area of the original deep foundation pit, a temporary horizontal inner support is not arranged, so the construction method of the invention reduces the installation and dismantling processes of the traditional temporary horizontal support of the foundation pit, can greatly improve the construction efficiency, quickens the construction progress and saves the construction period.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 to 7 are schematic structural diagrams of a basement structure semi-reverse construction method for an ultra-large deep foundation pit according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 7, the invention provides a semi-reverse construction method of a basement structure for an ultra-large deep foundation pit, which comprises the following steps:
s1: referring to fig. 1, the deep foundation pit is divided into a central island region B and an edge region a surrounding the central island region B.
The construction of the basement structure is divided into a central island area B and an edge area A. Subsequently, the basement structure in the central island area is constructed by a forward construction method, and the basement structure in the edge area is constructed by a reverse construction method.
S2: referring to fig. 2, a support pile 1 is constructed at the outer edge of the edge area a, while a support column 6 is constructed in the edge area a.
The step of constructing the support column 6 in the edge area a includes:
s21, pile holes are formed in the edge area A.
And S22, pouring the pile foundation 7 in the pile hole.
And S23, constructing the support column 6 on the pile foundation 7.
And S24, backfilling fine sand in the gap between the support column 6 and the pile hole.
In the present embodiment, the support column 6 is a steel pipe concrete pile.
In some embodiments, the support piles and the pile foundation construction within the outer wall of the underground structure are performed by zone segmentation.
The support columns 6 are used for the frame columns of the frame structure of the underground structure of the edge region of the top-down construction. And fine sand is filled between the supporting column 6 and the pile hole.
S3: referring to fig. 3, the first underground structure 2 in the central island region B is constructed in a sequential manner without horizontal inner supports in the central island region B.
Before the first underground structure in the central island region is constructed, region pile foundation construction is sequentially carried out on the central island, and then construction from the basement negative second floor bottom plate to the basement top plate in the central island region is completed by adopting a sequential construction method to construct the first underground structure.
S4: referring to fig. 4 to 6, in the border area a, the second underground structure 3 in the border area a is constructed by using a reverse method, when the second underground structure 3 is constructed, one side of the beam slab 31 of each layer of the second underground structure 3 is connected to the beam slab 21 of the layer corresponding to the position of the first structure, and the other side of the beam slab of each layer of the second underground structure 3 is supported by the support piles 1 through the support exchange beam slab 4, so that the beam slab 31 of the second underground structure 3 serves as a horizontal support in the border area a, and the support column 6 serves as a vertical support in the border area a.
Referring to fig. 4, when the second underground structure 3 is constructed, a soil outlet 310 is formed in the floor slab of the top layer of the second underground structure 3, and the soil outlet is reinforced and blocked after the beam plate 4 is removed.
Referring to fig. 5 and 6, the reverse construction area (i.e., the marginal area) is excavated with the first layer and the second layer, and the second underground structure is constructed by formwork support of the bottom plate, reinforcement, concrete placement, and the like.
S5: referring to fig. 7, after the outer wall 32 of the second underground structure 3 is formed, earth 5 is backfilled between the outer wall 32 and the support piles 1 while removing the bracing change plate 4 of each layer.
The semi-reverse construction method for the basement structure of the ultra-large deep foundation pit can be used for constructing the basement main body structure in the deep foundation pit with the foundation pit area of more than 2 ten thousand square meters by adopting a semi-reverse construction method.
According to the semi-reverse construction method for the basement structure of the ultra-large deep foundation pit, the beam slab of the second underground structure is used as the horizontal support in the reverse construction stage, and the beam slab of the first underground structure in the central island region can be connected together during the construction of the negative layer and the negative layer of the second underground structure, so that the horizontal support is integrally formed. And because the outer wall (namely basement outer wall) of the second underground structure is constructed at last, the construction adopts the mode that the beam plates (short beams) are arranged on each layer of beam plate of the second underground structure for supporting so as to improve the stability. In the sequential construction stage, as the area of the central island area is greatly reduced compared with the area of the original deep foundation pit, a temporary horizontal inner support is not arranged, so the construction method of the invention reduces the installation and dismantling processes of the traditional temporary horizontal support of the foundation pit, can greatly improve the construction efficiency, quickens the construction progress and saves the construction period.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (5)
1. A semi-inverse construction method of a basement structure for an ultra-large deep foundation pit is characterized by comprising the following steps:
dividing a deep foundation pit into a central island region and an edge region surrounding the central island region;
constructing a support pile on the outer edge of the edge area, and constructing a support column in the edge area;
constructing a first underground structure in the central island region by a forward method in a mode of not arranging a horizontal inner support in the central island region;
in the marginal area, adopt reverse construction second underground structure in the marginal area, when being under construction second underground structure, one side of the beam slab of each layer of second underground structure connect in the corresponding one deck beam slab in position of first structure, the opposite side of the beam slab of each layer of second underground structure through trade the support beam slab support in the fender pile makes the beam slab of second underground structure conduct horizontal support in the marginal area, the support column is as vertical support in the marginal area.
2. The semi-inverse construction method of the basement structure for the ultra-large deep foundation pit according to claim 1, further comprising performing earth backfilling between the outer wall and the support piles after the outer wall of the second underground structure is formed, and removing the support beam replacing plate at each layer.
3. The semi-reverse construction method of the basement structure for the ultra-large deep foundation pit according to claim 2, wherein when the second underground structure is constructed, a soil outlet is formed in a floor slab of the second underground structure, and the soil outlet is reinforced and blocked after the support beam replacing plate is removed.
4. The semi-reverse construction method of the basement structure for the ultra-large deep foundation pit according to claim 1, wherein the step of constructing the support columns in the edge area comprises:
pile holes are formed in the edge areas;
pouring a pile foundation in the pile hole;
constructing the supporting column on the pile foundation;
and backfilling fine sand in the gap between the support column and the pile hole.
5. The semi-reverse construction method of the basement structure for the extra-large deep foundation pit according to claim 4, wherein the support columns are steel pipe concrete piles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211272569.4A CN115506405A (en) | 2022-10-18 | 2022-10-18 | Semi-inverse construction method for basement structure of ultra-large deep foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211272569.4A CN115506405A (en) | 2022-10-18 | 2022-10-18 | Semi-inverse construction method for basement structure of ultra-large deep foundation pit |
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| CN115506405A true CN115506405A (en) | 2022-12-23 |
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| CN202211272569.4A Pending CN115506405A (en) | 2022-10-18 | 2022-10-18 | Semi-inverse construction method for basement structure of ultra-large deep foundation pit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116988513A (en) * | 2023-09-25 | 2023-11-03 | 北京市建筑设计研究院有限公司 | Super-large foundation pit cover excavation reverse construction method |
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| KR20120093547A (en) * | 2011-02-15 | 2012-08-23 | 주식회사고려이엔시 | Top-down construction method of basement |
| CN102995659A (en) * | 2012-12-03 | 2013-03-27 | 杭州南联地基基础工程有限公司 | Method for constructing from central area to periphery of ultra-large type underground engineering |
| CN105155549A (en) * | 2015-06-18 | 2015-12-16 | 中建三局第二建设工程有限责任公司 | Partition support system for large-area deep foundation pit under forward and backward working condition, and construction method thereof |
| CN205205832U (en) * | 2015-11-16 | 2016-05-04 | 上海建工五建集团有限公司 | Structure is propped in trading of underground building |
| CN115094912A (en) * | 2022-08-01 | 2022-09-23 | 上海建工一建集团有限公司 | Trans-partition forward and backward combined construction method for building on upper part of ultra-large soft soil foundation pit |
-
2022
- 2022-10-18 CN CN202211272569.4A patent/CN115506405A/en active Pending
Patent Citations (6)
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| KR20120093547A (en) * | 2011-02-15 | 2012-08-23 | 주식회사고려이엔시 | Top-down construction method of basement |
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| CN205205832U (en) * | 2015-11-16 | 2016-05-04 | 上海建工五建集团有限公司 | Structure is propped in trading of underground building |
| CN115094912A (en) * | 2022-08-01 | 2022-09-23 | 上海建工一建集团有限公司 | Trans-partition forward and backward combined construction method for building on upper part of ultra-large soft soil foundation pit |
Non-Patent Citations (1)
| Title |
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| 赵志缙等: "《高层建筑施工》", 同济大学出版社, pages: 79 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116988513A (en) * | 2023-09-25 | 2023-11-03 | 北京市建筑设计研究院有限公司 | Super-large foundation pit cover excavation reverse construction method |
| CN116988513B (en) * | 2023-09-25 | 2023-12-22 | 北京市建筑设计研究院有限公司 | Super-large foundation pit cover excavation reverse construction method |
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