CN114439027A - Construction method of concrete building foundation on deep and strong permeable foundation of hydroelectric engineering - Google Patents
Construction method of concrete building foundation on deep and strong permeable foundation of hydroelectric engineering Download PDFInfo
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- CN114439027A CN114439027A CN202210174406.6A CN202210174406A CN114439027A CN 114439027 A CN114439027 A CN 114439027A CN 202210174406 A CN202210174406 A CN 202210174406A CN 114439027 A CN114439027 A CN 114439027A
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- 238000010276 construction Methods 0.000 title claims abstract description 28
- 239000004575 stone Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000007596 consolidation process Methods 0.000 claims abstract description 4
- 238000001556 precipitation Methods 0.000 claims abstract description 4
- 239000003673 groundwater Substances 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 3
- 101150054854 POU1F1 gene Proteins 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011798 excavation material Substances 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/22—Lining sumps in trenches or other foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Foundations (AREA)
Abstract
The invention discloses a construction method of a concrete building foundation on a deep and strong permeable foundation of hydroelectric engineering, which comprises the steps of excavating a foundation pit to 1.0-1.2 m below a foundation surface, arranging a water collecting pit at a proper position outside the foundation for precipitation, backfilling graded broken stones to the foundation surface, embedding horizontal and circumferential drain pipes in the graded broken stones for drainage, pouring the concrete building foundation and an upper structure on the broken stone foundation, embedding grouting reserved plugs in grouting pipes in a foundation bottom plate, backfilling the foundation pit at the periphery of the building by adopting excavating materials after the construction of the main body of the building is finished, and performing consolidation grouting on a graded broken stone layer through the reserved grouting holes to finish foundation treatment. The method effectively solves the problems of high anti-seepage and dewatering measure cost, high difficulty and the like in the construction of the concrete building on the deep strong permeable foundation, ensures the engineering quality and safety, is not only quick and reliable, but also economical and simple, and is suitable for the construction of the concrete building on the deep strong permeable foundation of the hydraulic and hydroelectric engineering.
Description
Technical Field
The invention relates to a foundation construction method, in particular to a construction method of a concrete building foundation on a deep and strong permeable foundation of a hydroelectric project.
Background
The gate dam is built on the river course in hydraulic and hydroelectric engineering, buildings such as a pump station are built on the bank side, deep sand gravel foundations can be frequently encountered, the water permeability of sand gravel is high, the foundation surface is lower than the water level of the river course after the foundation pit is excavated, and a large amount of water can seep into the foundation pit. In order to ensure normal pouring construction of concrete, a suspended type impervious wall is usually required to be arranged on a cofferdam and drainage measures are supplemented to reduce the underground water level in a foundation pit to be below 0.5m of a building base surface, and some projects are difficult to reduce water, so that underwater concrete pouring is forced to be adopted. The diaphragm wall has long construction period and high construction cost, and the drainage cost required for reducing the groundwater level to below 0.5m of the building base surface is high.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the construction method of the concrete building foundation on the deep and strong permeable foundation of the hydroelectric engineering can reduce the anti-seepage measures and the cost and can meet the safety requirements of the building.
In order to solve the technical problems, the invention adopts the technical scheme that: a construction method of a concrete building foundation on a deep and strong permeable foundation of a hydroelectric project comprises the following steps:
1) excavating the foundation pit to be 1.0-1.2 m below a foundation surface, and meanwhile, building a water collecting pit to the foundation surface from the bottom surface of the foundation pit by adopting concrete pipe sheets at a proper position outside the foundation;
2) backfilling graded broken stones in the foundation pit to a foundation surface, and simultaneously embedding horizontal and circumferential drainage pipes in the graded broken stones to form a closed drainage loop for draining water to a sump;
3) when the underground water level is lowered below a building base plane, a concrete building foundation and an upper structure are poured on the gravel foundation, and a grouting pipe is embedded in a foundation bottom plate;
4) after the construction of the main body engineering of the building is finished, the water collecting pit is continuously built by concrete pipe sheets, broken stones are adopted to backfill foundation pits around the building, the upper parts of the broken stone layers are backfilled by excavating materials, and precipitation is carried out through the water collecting pit;
5) backfilling the water collecting pit with crushed stones after the backfilling of the foundation pits around the building is finished;
6) performing consolidation grouting on the graded crushed stone layer through the reserved grouting holes, and performing foundation treatment;
7) and (5) pouring concrete to block the reserved grouting holes to finish foundation treatment.
And in the step 2), the graded broken stones are subjected to static rolling by using a light mill to meet the requirement of the bearing capacity of the building.
In the step 3), a plug of 0.2m is left at the bottom of the grouting pipe.
And 4) backfilling and compacting the foundation pits around the building layer by using broken stones, wherein the top surface of the broken stone layer is at least 0.4m higher than the underground water level, and the excavated materials are backfilled at the upper part of the broken stone layer.
The invention has the beneficial effects that: the method of the invention makes up the defects of the traditional cofferdam seepage-proofing and drainage-assisted method, and has the advantages of convenient construction, reliable effect, good economic benefit and guaranteed construction quality.
Drawings
FIG. 1 is a plan view of a concrete building foundation on a deep and highly permeable foundation using the construction method of the present invention.
Fig. 2 is a sectional view a-a of fig. 1 showing a drainage period in which the construction method of the present invention is applied.
Fig. 3 is a sectional view a-a of fig. 1 during a grouting period using the construction method of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in figures 1-3, the construction method of the concrete building foundation on the deep and strong permeable foundation of the hydroelectric engineering comprises the following steps:
1) excavating the foundation pit to be 1.0-1.2 m below a foundation surface, and meanwhile, building a water collecting pit 1 to the foundation surface by using concrete segments from the bottom surface of the foundation pit at a proper position outside the foundation;
2) backfilling graded broken stones 2 to a foundation surface in the foundation pit, and simultaneously embedding horizontal and circumferential drain pipes 3 in the graded broken stones 2 to form a closed drain loop for draining water to a sump 1;
3) when the underground water level is lowered below a building base plane, a concrete building foundation 4 and an upper structure 10 are poured on the gravel foundation, and a grouting pipe 5 is embedded in a base plate of the foundation 1;
4) after the construction of the main body engineering of the building is finished, the water collecting pit 1 is continuously built by concrete pipe sheets, foundation pits around the building are backfilled by broken stones 7, the upper parts of the broken stone layers are backfilled by excavating materials 8, and precipitation is carried out through the water collecting pit 1;
5) backfilling the water collecting pit 1 by using broken stones after backfilling foundation pits around the building;
6) carrying out consolidation grouting 9 on the graded crushed stone layer through a reserved grouting pipe 5, and carrying out foundation treatment;
7) and (5) pouring concrete to block the reserved grouting holes to finish foundation treatment.
In the step 2), the graded broken stones 2 are statically rolled by using a light mill to meet the requirement of the bearing capacity of the building.
In the step 3), a plug 6 with the diameter of 0.2m is reserved at the bottom of the grouting pipe 5.
And 4) backfilling and compacting foundation pits around the building layer by using crushed stones, wherein the top surface of the crushed stone layer is at least 0.4m higher than the underground water level, and the upper parts of 7 layers of crushed stones are backfilled with excavation materials 8.
The horizontal drainage pipe is a steel pipe, and the opening rate is 25-30%. The embedded grouting pipe in the foundation slab is a PVC pipe, the outer diameter of the embedded grouting pipe is 50mm, and the distance from the bottom to a building base surface is 0.2m when the embedded grouting pipe is embedded. And after the construction of the main body engineering of the building is finished, backfilling and compacting foundation pits around the building layer by using broken stones under the condition that the weight of the building can meet the requirements of anti-floating stability and certain safety margin, wherein the safety coefficient of the anti-floating stability is greater than 1.2. The water collecting pit is arranged outside the foundation, a water collecting well is built by using concrete pipe pieces when the broken stones are backfilled layer by layer along with the foundation pit, and 2 layers of water collecting well with the weight of 200g/m are externally used2The geotextile is used for wrapping.
The foundation construction method of the invention can reduce the anti-seepage measure and the cost and can also meet the safety requirement of the building.
The above-mentioned embodiments are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and to implement the present invention accordingly, but not to limit the scope of the present invention by only the embodiments, i.e. all equivalent changes or modifications made within the spirit of the present invention disclosed in the present invention still fall within the scope of the present invention.
Claims (4)
1. A construction method of a concrete building foundation on a deep and strong permeable foundation of a hydroelectric project is characterized by comprising the following steps:
1) excavating the foundation pit to be 1.0-1.2 m below a foundation surface, and meanwhile, building a water collecting pit to the foundation surface from the bottom surface of the foundation pit by adopting concrete pipe sheets at a proper position outside the foundation;
2) backfilling graded broken stones in the foundation pit to a foundation surface, and simultaneously embedding horizontal and circumferential drainage pipes in the graded broken stones to form a closed drainage loop for draining water to a sump;
3) when the underground water level is lowered below a building base plane, a concrete building foundation and an upper structure are poured on the gravel foundation, and a grouting pipe is embedded in a foundation bottom plate;
4) after the construction of the main body engineering of the building is finished, the water collecting pit is continuously built by concrete pipe sheets, broken stones are adopted to backfill foundation pits around the building, the upper parts of the broken stone layers are backfilled by excavating materials, and precipitation is carried out through the water collecting pit;
5) backfilling the water collecting pit with crushed stones after the backfilling of the foundation pits around the building is finished;
6) performing consolidation grouting on the graded crushed stone layer through the reserved grouting holes, and performing foundation treatment;
7) and (5) pouring concrete to block the reserved grouting holes to finish foundation treatment.
2. The construction method of the concrete building foundation on the deep and strong permeable foundation of the hydroelectric engineering according to claim 1, characterized in that in the step 2), graded broken stones are rolled by static force by using a light mill to meet the requirement of the bearing capacity of the building.
3. The construction method of the concrete building foundation on the deep and strong permeable foundation of the hydroelectric engineering according to claim 1, wherein in the step 3), a plug of 0.2m is left at the bottom of the grouting pipe.
4. The construction method of the concrete building foundation on the hydroelectric engineering deep and strong permeable foundation according to claim 1, characterized in that in the step 4), the foundation pits around the building are backfilled layer by layer and compacted with gravels, the top surface of the gravels layer is at least 0.4m higher than the ground water level, and the excavated materials are backfilled at the upper part of the gravels layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210174406.6A CN114439027A (en) | 2022-02-24 | 2022-02-24 | Construction method of concrete building foundation on deep and strong permeable foundation of hydroelectric engineering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210174406.6A CN114439027A (en) | 2022-02-24 | 2022-02-24 | Construction method of concrete building foundation on deep and strong permeable foundation of hydroelectric engineering |
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| Publication Number | Publication Date |
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| CN114439027A true CN114439027A (en) | 2022-05-06 |
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| CN202210174406.6A Pending CN114439027A (en) | 2022-02-24 | 2022-02-24 | Construction method of concrete building foundation on deep and strong permeable foundation of hydroelectric engineering |
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| Country | Link |
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| CN (1) | CN114439027A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809050A (en) * | 2022-05-13 | 2022-07-29 | 济南轨道交通集团有限公司 | Foundation pit drainage system for karst fracture water enrichment and construction method |
| CN115354704A (en) * | 2022-08-11 | 2022-11-18 | 中国水利水电第十一工程局有限公司 | Grooving treatment method for plain wind field fan foundation karst foundation water seepage |
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|---|---|---|---|---|
| CN101705691A (en) * | 2009-10-30 | 2010-05-12 | 南通建工集团股份有限公司 | Construction method of dewatering well under foundation slab in foundation pit |
| KR101761779B1 (en) * | 2016-07-11 | 2017-07-26 | 남순우 | Method for constructing base-inserting steel sump |
| CN111519647A (en) * | 2019-02-02 | 2020-08-11 | 南京润业企业管理咨询中心(有限合伙) | Novel foundation suitable for marine soft foundation treatment and reinforcement and construction method |
| CN113106926A (en) * | 2021-05-12 | 2021-07-13 | 中国二十二冶集团有限公司 | Construction method for foundation backfill of blown-fill sand reclamation foundation in coastal region |
| CN113445525A (en) * | 2021-09-01 | 2021-09-28 | 中铁十八局集团第五工程有限公司 | Method and structure for controlling water pressure of bottom plate in construction of bottom plate of foundation pit of deep foundation pit |
| CN113463670A (en) * | 2021-09-02 | 2021-10-01 | 中铁十八局集团第五工程有限公司 | Water pumping and draining method and water pumping and draining structure for deep foundation pit bottom plate construction |
-
2022
- 2022-02-24 CN CN202210174406.6A patent/CN114439027A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705691A (en) * | 2009-10-30 | 2010-05-12 | 南通建工集团股份有限公司 | Construction method of dewatering well under foundation slab in foundation pit |
| KR101761779B1 (en) * | 2016-07-11 | 2017-07-26 | 남순우 | Method for constructing base-inserting steel sump |
| CN111519647A (en) * | 2019-02-02 | 2020-08-11 | 南京润业企业管理咨询中心(有限合伙) | Novel foundation suitable for marine soft foundation treatment and reinforcement and construction method |
| CN113106926A (en) * | 2021-05-12 | 2021-07-13 | 中国二十二冶集团有限公司 | Construction method for foundation backfill of blown-fill sand reclamation foundation in coastal region |
| CN113445525A (en) * | 2021-09-01 | 2021-09-28 | 中铁十八局集团第五工程有限公司 | Method and structure for controlling water pressure of bottom plate in construction of bottom plate of foundation pit of deep foundation pit |
| CN113463670A (en) * | 2021-09-02 | 2021-10-01 | 中铁十八局集团第五工程有限公司 | Water pumping and draining method and water pumping and draining structure for deep foundation pit bottom plate construction |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114809050A (en) * | 2022-05-13 | 2022-07-29 | 济南轨道交通集团有限公司 | Foundation pit drainage system for karst fracture water enrichment and construction method |
| CN115354704A (en) * | 2022-08-11 | 2022-11-18 | 中国水利水电第十一工程局有限公司 | Grooving treatment method for plain wind field fan foundation karst foundation water seepage |
| CN115354704B (en) * | 2022-08-11 | 2023-11-03 | 中国水利水电第十一工程局有限公司 | Water seepage grooving treatment method for karst foundation of fan foundation of plain wind farm |
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