CN115233700A - Supporting beam conversion structure in foundation pit and construction method thereof - Google Patents
Supporting beam conversion structure in foundation pit and construction method thereof Download PDFInfo
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- CN115233700A CN115233700A CN202211052635.7A CN202211052635A CN115233700A CN 115233700 A CN115233700 A CN 115233700A CN 202211052635 A CN202211052635 A CN 202211052635A CN 115233700 A CN115233700 A CN 115233700A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 60
- 238000010276 construction Methods 0.000 title claims abstract description 40
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 18
- 239000002689 soil Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000009412 basement excavation Methods 0.000 claims abstract description 5
- 238000007667 floating Methods 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000011150 reinforced concrete Substances 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000004567 concrete Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004904 shortening 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
- 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)
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- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention provides a foundation pit inner supporting beam conversion structure and a construction method thereof, wherein a foundation pit surrounding supporting structure is used for retaining soil pressure outside a foundation pit and providing an effective working space for main basement structure construction, an inner supporting beam column system is an effective inner supporting structure stress system aiming at the foundation pit surrounding supporting structure in the foundation pit earthwork excavation process, a reinforcing section bottom plate is arranged at the end part of a side pit bottom plate of a few-storey basement main structure close to the position where the elevation of a foundation pit bottom plate changes, a conversion buttress is arranged at one end of the reinforcing section bottom plate, one end of at least one inner supporting beam in the inner supporting beam is in stress connection with the conversion buttress, the construction space of the few-storey basement main structure is occupied, and the conversion buttress effectively solves the problem that the lower layer of the supporting beam directly forms a paired support in the traditional method and occupies the construction working space of the basement structure under the condition of ensuring stable stress, thereby being very beneficial to quickening the construction period, saving the construction cost and improving the stress of the foundation pit supporting structure.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting structures, in particular to a foundation pit inner supporting beam conversion structure and a construction method thereof.
Background
With the acceleration of the urbanization process in China, the limited land area of an urban area and the increasingly-sharp demand of a building space are in conflict with each other and gradually increased, the deep development and utilization of underground space become effective ways for solving the problems of land resource shortage, traffic jam, city space expansion and environmental deterioration alleviation, and are also important ways for realizing sustainable development, resource-saving and environment-friendly society construction in human society and economy, foundation pit support is used as an important ring for underground space development and construction, and the support difficulty is gradually increased along with the complexity and diversity of the underground space structure; particularly, when the number of layers of adjacent main basements is different and the elevation of the bottom plate of the foundation pit is inconsistent, if the opposite-supporting beams at two sides are continuously adopted to form a complete and effective force transmission system, the construction working space at one side of the main structure of the basement at fewer layers is unnecessarily occupied, the construction period is influenced, and the construction cost is increased; in order to avoid the influence on the construction of one side of the main structure of the basement with few floors, a special technical measure of converting the structure is adopted for the supporting beam in the foundation pit at one side of the main structure of the basement with multiple floors in the critical area where the elevation of the bottom plate of the foundation pit changes, which is very necessary for optimizing the supporting technology of deep foundation pit engineering.
Disclosure of Invention
The invention aims to provide a conversion structure of a supporting beam in a foundation pit and a construction method thereof aiming at the technical defects of a traditional two-side opposite-supporting type supporting beam supporting structure system, effectively solves the problem that the opposite-supporting type inner supporting beam occupies the construction working space of a local basement structure in the traditional method, and is very beneficial to shortening the construction period, saving the manufacturing cost and optimizing the stress of the foundation pit supporting structure.
In order to realize the purpose, the invention adopts the technical scheme that: a foundation pit inner supporting beam conversion structure comprises a foundation pit periphery supporting structure, an inner supporting beam column system, a conversion buttress, a reinforcing section bottom plate, a foundation pit bottom plate, a critical area supporting structure, a base soil layer and an anti-floating anchor rod; the supporting structure around the foundation pit is arranged around the foundation pit according to design and construction requirements, the inner supporting beam-column system consists of a plurality of inner supporting beams and vertical supporting columns, and the inner supporting beam-column system is an effective inner supporting structure stress system aiming at the supporting structure around the foundation pit in the earth excavation process of the foundation pit; the foundation pit bottom plate is divided into a multi-layer basement main body structure side foundation pit bottom plate and a few-layer basement main body structure side foundation pit bottom plate, and the foundation pit bottom plate is further in anchoring connection with a foundation layer through arranging an anti-floating anchor rod; a critical area supporting structure is arranged in a critical area where the elevation of the foundation pit bottom plate changes, a reinforcing section bottom plate is arranged in the end area of the pit bottom plate of the side base of the main structure of the basement at a position close to the position where the elevation of the foundation pit bottom plate changes, and a conversion buttress is arranged at one end of the reinforcing section bottom plate; one end of at least one of the plurality of inner supporting beams is connected with the conversion buttress in a stress way.
Preferably, the plurality of inner support beams are provided with two inner support beams, and one end of the lower inner support beam is in stress connection with the conversion buttress.
Preferably, the plurality of inner supporting beams are provided with three inner supporting beams, wherein one end of the lower inner supporting beam or two inner supporting beams is/are in stressed connection with the conversion buttress.
Preferably, the conversion buttress is of a right-angle trapezoidal section-shaped reinforced concrete structure, one end of the conversion buttress is connected with the inner support beam in a pouring mode, the other end of the conversion buttress is connected with the reinforcing section bottom plate in an equal-thickness pouring mode, and anti-floating anchor rods different in length are arranged below the conversion buttress.
Preferably, the anti-floating anchor rod is a reinforced anti-floating anchor rod.
Preferably, the supporting structure around the foundation pit is one of row piles, secant piles or underground continuous walls.
Preferably, the critical area supporting structure comprises a reinforced concrete structure slope surface arranged on the surface of the critical area with the changed elevation of the foundation pit bottom plate and a rock stratum soil nail anchored in the critical area, and the end part of the rock stratum soil nail is fixed with a planting bar in the slope surface.
Preferably, the critical area supporting structure is one of a row pile, a secant pile or an underground continuous wall.
A construction method for a support beam conversion structure in a foundation pit comprises the following steps: (1) Constructing and maintaining a supporting structure around the foundation pit and a vertical supporting column structure of the inner supporting beam column system according to design and construction requirements;
(2) Excavating earthwork in the foundation pit to a depth of 1-2 m below the bottom elevation of the first inner support beam, and leveling; manufacturing a first inner supporting beam structure through cast-in-place construction; maintaining until the design bearing capacity requirement is met;
(3) Aiming at the area on one side of the main structure of the multi-layer basement, earth is continuously excavated in the foundation pit to the depth of 1-2 meters below the bottom elevation of the inner supporting beam in the second channel, and the foundation pit is leveled; continuously excavating earthwork in the foundation pit to the designed position depth of the elevation of the bottom surface of the foundation pit and leveling the earthwork aiming at the area on one side of the main structure of the basement with few floors; manufacturing a second inner supporting beam structure, a conversion buttress, a reinforcing section bottom plate, a few-storey basement main structure side foundation pit bottom plate and an anti-floating anchor rod through cast-in-place construction; maintaining until the design bearing capacity requirement is met;
(4) Aiming at the area on one side of the main structure of the multi-layer basement, continuously excavating earthwork in the foundation pit to the depth of 1-2 meters below the bottom elevation of the next inner supporting beam, and leveling; manufacturing a corresponding next inner supporting beam structure by cast-in-place construction; maintaining until the design bearing capacity requirement is met;
(5) Continuously excavating earthwork in the foundation pit to the designed position depth of the elevation of the bottom surface of the foundation pit and leveling the earthwork aiming at the area on one side of the main structure of the multi-layer basement; constructing and manufacturing a base plate of a foundation pit at the side of the main structure of the multi-layer basement and an anti-floating anchor rod in a cast-in-place manner; maintaining until the design bearing capacity requirement is met;
(6) Layered backfilling earthwork, sequentially dismantling inner support beam-column system and conversion buttress structure
The beneficial effects of the invention are: the foundation pit surrounding supporting structure is used for retaining soil pressure outside a foundation pit, effective working space is provided for construction of a main basement structure, an inner supporting beam-column system is an effective inner supporting structure stress system aiming at the foundation pit surrounding supporting structure in the excavation process of foundation pit earthwork, a reinforcing section bottom plate is arranged at the end part of a side pit bottom plate of a few-story basement main structure close to the position where the elevation of a foundation pit bottom plate changes, a conversion buttress is arranged at one end of the reinforcing section bottom plate, one end of at least one inner supporting beam in the inner supporting beam is in stress connection with the conversion buttress, the construction space of the few-story basement main structure is occupied less, the conversion buttress effectively solves the problem that when a lower supporting beam directly forms a paired support in the traditional method, the construction working space problem of the basement structure is occupied, the construction period is shortened, the construction cost is saved, and the stress of the foundation pit supporting structure is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic diagram of a support conversion connection structure in a foundation pit.
Fig. 2 is a schematic view of a connection structure of the conversion buttress. Fig. 3 is a structural schematic diagram of the conversion buttress after being detached.
Wherein: the foundation pit supporting structure comprises a foundation pit surrounding supporting structure, an inner supporting beam column system, an inner supporting beam 2-1, a vertical supporting column 2-2, a few-layer basement main structure side foundation pit bottom plate 3, a multilayer basement main structure side foundation pit bottom plate 4, a conversion buttress 5, a reinforcement section bottom plate 6, a critical area supporting structure 7, a reinforcement section bottom plate end 8, an anti-floating anchor rod 9 and a foundation soil layer 10.
Detailed Description
The present invention will be described in further detail with reference to the accompanying fig. 1-3.
As shown in fig. 1-3, a foundation pit inner supporting beam conversion structure comprises a foundation pit periphery supporting structure 1, an inner supporting beam-column system 2, a conversion buttress 5, a reinforcing section bottom plate 6, a foundation pit bottom plate, a critical area supporting structure 7, a foundation soil layer 10 and an anti-floating anchor rod 9; the foundation pit surrounding supporting structure 1 is arranged around a foundation pit according to design and construction requirements, the inner supporting beam-column system 2 is composed of a plurality of inner supporting beams 2-1 and vertical supporting columns 2-2, and the inner supporting beam-column system 2 is an effective inner supporting structure stress system aiming at the foundation pit surrounding supporting structure 1 in the foundation pit earthwork excavation process; the foundation pit bottom plate is divided into a three-layer basement main structure side foundation pit bottom plate 3 and a two-layer basement main structure side foundation pit bottom plate 4, and the foundation pit bottom plate is also in anchoring connection with a foundation layer 10 by arranging an anti-floating anchor rod 9; a critical area supporting structure 7 is arranged in the critical area where the elevation of the foundation pit bottom plate changes, a reinforcing section bottom plate 6 is arranged in the end part area of the foundation pit bottom plate 3 on the side of the two-layer basement main structure close to the position where the elevation of the foundation pit bottom plate changes, and a conversion buttress 5 is arranged at one end 8 of the reinforcing section bottom plate; one end of at least one inner supporting beam 2-1 in the plurality of inner supporting beams 2-1 is connected with the conversion buttress 5 in a stress way.
In specific implementation, the plurality of inner supporting beams 2-1 are provided with two inner supporting beams 2-1, wherein one end of the lower inner supporting beam 2-1 is in stressed connection with the conversion buttress 5.
During specific implementation, the conversion buttress 5 is of a right-angle trapezoid cross-section-shaped reinforced concrete structure, one end of the conversion buttress 5 is connected with the inner supporting beam 2-1 in a pouring mode, the other end of the conversion buttress 5 is connected with the reinforcing section bottom plate 6 in an equal-thickness pouring mode, and anti-floating anchor rods 9 with different lengths are arranged below the conversion buttress 5.
In specific implementation, the anti-floating anchor rod 9 is a reinforced anti-floating anchor rod.
In specific implementation, the supporting structure 1 around the foundation pit is a row pile.
When the concrete implementation is carried out, the critical area supporting structure 7 is an anchor rod-concrete injection wall slope protection structure.
A construction method for an inner supporting beam conversion structure in a foundation pit comprises the following steps: (1) Constructing and maintaining a supporting structure 1 around the foundation pit and a vertical supporting column 2-2 structure of an inner supporting beam column system 2 according to design and construction requirements;
(2) Excavating earthwork in the foundation pit to a depth of 1-2 m below the bottom elevation of the first inner supporting beam 2-1, and leveling; manufacturing a first inner support beam 2-1 structure through cast-in-place construction; maintaining until the design bearing capacity requirement is met;
(3) Continuously excavating earthwork in the foundation pit to a depth of 1-2 meters below the bottom elevation of the second inner supporting beam aiming at the area on one side of the main structure of the three-layer basement, and leveling; continuously excavating earthwork in the foundation pit to the designed position depth of the elevation of the bottom surface of the foundation pit and leveling the earthwork aiming at the area on one side of the main structure of the two-layer basement; a second inner supporting beam 2-1 structure, a conversion buttress 5, a reinforcing section bottom plate 6, a few-layer basement main body structure side foundation pit bottom plate 3 and an anti-floating anchor rod 9 are manufactured through cast-in-place construction; maintaining until the design bearing capacity requirement is met;
(4) Continuously excavating earthwork in the foundation pit to the designed position depth of the elevation of the bottom surface of the foundation pit and leveling the earthwork aiming at the area on one side of the main structure of the three-layer basement; constructing and manufacturing a foundation pit bottom plate 4 and an anti-floating anchor rod 9 on the side of the main structure of the three-layer basement in a cast-in-place manner; maintaining until the design bearing capacity requirement is met;
(5) And (3) backfilling earthwork in layers, and sequentially dismantling the inner support beam-column system 2 and the conversion buttress 5 structure.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, while the invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A supporting beam conversion structure in foundation ditch, its characterized in that: the foundation pit supporting structure comprises a foundation pit surrounding supporting structure, an inner supporting beam-column system, a conversion buttress, a reinforcing section bottom plate, a foundation pit bottom plate, a critical area supporting structure, a foundation soil layer and an anti-floating anchor rod; the supporting structure around the foundation pit is arranged around the foundation pit according to design and construction requirements, the inner supporting beam-column system consists of a plurality of inner supporting beams and vertical supporting columns, and the inner supporting beam-column system is an effective inner supporting structure stress system aiming at the supporting structure around the foundation pit in the earth excavation process of the foundation pit; the foundation pit bottom plate is divided into a multi-layer basement main structure side foundation pit bottom plate and a few-layer basement main structure side foundation pit bottom plate, the foundation pit bottom plate is further in anchoring connection with a foundation soil layer through arranging an anti-floating anchor rod, a critical area supporting structure is arranged in a critical area where the elevation of the foundation pit bottom plate changes, and a reinforcing section bottom plate is arranged in the end area of the few-layer basement main structure side foundation pit bottom plate close to the position where the elevation of the foundation pit bottom plate changes; one end of the reinforcing section bottom plate is provided with a conversion buttress; one end of at least one of the plurality of inner supporting beams is in stressed connection with the conversion buttress.
2. An in-pit supporting beam conversion structure as claimed in claim 1, wherein: the plurality of inner supporting beams are provided with two inner supporting beams, and one end of the inner supporting beam at the bottom is connected with the conversion buttress in a stress mode.
3. An in-pit supporting beam conversion structure as claimed in claim 1, wherein: the plurality of inner supporting beams are provided with three inner supporting beams, wherein one end of the lower inner supporting beam or two inner supporting beams is/are in stressed connection with the conversion buttress.
4. The foundation pit internal support beam conversion structure according to claim 1, wherein: the conversion buttress is right trapezoid cross section form reinforced concrete structure, and conversion buttress one end is pour with interior support beam and is connected, and the conversion buttress other end is pour with the stiffening section bottom plate uniform thickness and is connected, and the anti-floating anchor rod that differs in length has been arranged to conversion buttress below.
5. An in-pit support beam conversion structure as claimed in claim 4, wherein: the anti-floating anchor rod is a reinforced anti-floating anchor rod.
6. The foundation pit internal support beam conversion structure according to claim 1, wherein: the supporting structure around the foundation pit is one of row piles, secant piles or underground continuous walls.
7. The foundation pit internal support beam conversion structure according to claim 1, wherein: the critical area supporting structure comprises a reinforced concrete structure slope arranged on the surface of the critical area with the changed elevation of the foundation pit bottom plate and a rock stratum soil nail anchored in the critical area, and the end part of the rock stratum soil nail is fixed with a planting bar in the slope.
8. An in-pit supporting beam conversion structure as claimed in claim 1, wherein: the critical area supporting structure is one of row piles, secant piles or underground continuous walls.
9. A construction method for an inner supporting beam conversion structure in a foundation pit comprises the following steps: (1) Constructing and maintaining a supporting structure around the foundation pit and a vertical supporting column structure of the inner supporting beam column system according to design and construction requirements;
(2) Excavating earthwork in the foundation pit to a depth of 1-2 meters below the bottom elevation of the first inner support beam, and leveling; manufacturing a first inner supporting beam structure through cast-in-place construction; maintaining until the design bearing capacity requirement is met;
(3) Continuously excavating earthwork in the foundation pit to a depth of 1-2 m below the bottom elevation of the second support beam in the foundation pit aiming at the area on one side of the main structure of the multi-layer basement, and leveling; continuously excavating earthwork in the foundation pit to the designed position depth of the elevation of the bottom surface of the foundation pit and leveling the earthwork aiming at the area on one side of the main structure of the basement with few floors; manufacturing a second inner supporting beam structure, a conversion buttress, a reinforcing section bottom plate, a few-storey basement main structure side foundation pit bottom plate and an anti-floating anchor rod through cast-in-place construction; maintaining until the design bearing capacity requirement is met;
(4) Aiming at the area on one side of the main structure of the multi-layer basement, continuously excavating earthwork in the foundation pit to the depth of 1-2 meters below the bottom elevation of the next inner supporting beam, and leveling; manufacturing a corresponding next inner supporting beam structure through cast-in-place construction; maintaining until the design bearing capacity requirement is met;
(5) Continuously excavating earthwork in the foundation pit to the designed position depth of the elevation of the bottom surface of the foundation pit and leveling the earthwork aiming at the area on one side of the main structure of the multi-layer basement; constructing and manufacturing a base plate of a foundation pit at the side of the main structure of the multi-layer basement and an anti-floating anchor rod in a cast-in-place manner; maintaining until the design bearing capacity requirement is met;
(6) And (4) backfilling earthwork in layers, and sequentially dismantling the inner support beam-column system and the conversion buttress structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211052635.7A CN115233700A (en) | 2022-08-29 | 2022-08-29 | Supporting beam conversion structure in foundation pit and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211052635.7A CN115233700A (en) | 2022-08-29 | 2022-08-29 | Supporting beam conversion structure in foundation pit and construction method thereof |
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| CN115233700A true CN115233700A (en) | 2022-10-25 |
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| CN202211052635.7A Pending CN115233700A (en) | 2022-08-29 | 2022-08-29 | Supporting beam conversion structure in foundation pit and construction method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130008125A1 (en) * | 2010-03-19 | 2013-01-10 | Nihon Kankyo Seizou Kabushiki Kaisha | Construction method for new underground structure |
| CN104631468A (en) * | 2015-03-11 | 2015-05-20 | 中国建筑第八工程局有限公司 | Supporting method for foundation pit excavation project |
| CN106545019A (en) * | 2016-10-12 | 2017-03-29 | 上海建工建集团有限公司 | For the support-replacing system and construction method of stage differential style Underground Construction |
| CN106836238A (en) * | 2017-03-06 | 2017-06-13 | 浙江省建建设集团有限公司 | A kind of construction method and its structure for falling the vertical floor support replacement of grade formula deep basal pit |
-
2022
- 2022-08-29 CN CN202211052635.7A patent/CN115233700A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130008125A1 (en) * | 2010-03-19 | 2013-01-10 | Nihon Kankyo Seizou Kabushiki Kaisha | Construction method for new underground structure |
| CN104631468A (en) * | 2015-03-11 | 2015-05-20 | 中国建筑第八工程局有限公司 | Supporting method for foundation pit excavation project |
| CN106545019A (en) * | 2016-10-12 | 2017-03-29 | 上海建工建集团有限公司 | For the support-replacing system and construction method of stage differential style Underground Construction |
| CN106836238A (en) * | 2017-03-06 | 2017-06-13 | 浙江省建建设集团有限公司 | A kind of construction method and its structure for falling the vertical floor support replacement of grade formula deep basal pit |
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Application publication date: 20221025 |
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