CN112323815A - Soil rock combines stratum deep basal pit suspension foot stake supporting construction - Google Patents
Soil rock combines stratum deep basal pit suspension foot stake supporting construction Download PDFInfo
- Publication number
- CN112323815A CN112323815A CN202011251640.1A CN202011251640A CN112323815A CN 112323815 A CN112323815 A CN 112323815A CN 202011251640 A CN202011251640 A CN 202011251640A CN 112323815 A CN112323815 A CN 112323815A
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- Prior art keywords
- foundation pit
- foot
- rock
- pit
- pile
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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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
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/40—Miscellaneous comprising stabilising elements
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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)
- Foundations (AREA)
Abstract
The invention relates to a supporting structure of a foot-hanging pile of a deep foundation pit in an earth-rock combined stratum. The invention aims to provide a supporting structure of a foot-hanging pile of a deep foundation pit of an earth-rock combined stratum, which has the advantages of simple structure, convenience in construction, safety and reliability. The technical scheme of the invention is as follows: the utility model provides an earth rock combines stratum deep basal pit to hang foot stake supporting construction which characterized in that: the foundation pit supporting structure comprises a plurality of foot hanging piles serving as a foundation pit supporting structure, wherein a reinforced concrete beam is arranged at the top of each foot hanging pile, and rock shoulders serving as an embedded structure of a foot hanging pile body are reserved at the bottom of the foundation pit; a pit inner support used for supporting the foot hanging pile is arranged in the foundation pit, the pit inner support comprises a concrete support which is arranged corresponding to a soil layer part at the top of the foundation pit and connected with the reinforced concrete beam, and a steel pipe support which is arranged corresponding to a soil layer part in the middle of the foundation pit, and the steel pipe support acts on the foot hanging pile through a steel purlin; the invention is suitable for the field of foundation pit engineering.
Description
Technical Field
The invention relates to a supporting structure of a foot-hanging pile of a deep foundation pit in an earth-rock combined stratum. The method is suitable for the field of foundation pit engineering.
Background
The foundation pit is commonly used in various engineering activities, the supporting mode of the foundation pit in the excavation process is an important research problem in foundation pit engineering, and particularly, the further development and utilization of the urban underground space in the urban development process provide higher requirements for the supporting structure and the stability of the foundation pit. In the foundation pit engineering, on the premise of meeting the requirements of stability and deformation, the construction process is simple, the environmental pollution is less, and the construction cost is lower, so that the important consideration factor for selecting the foundation pit supporting structure is realized.
In the deep foundation pit engineering combining upper soft and lower hard soil rocks with strata, for the rock stratum part in the foundation pit, because the lower rock mass has high strength and good stability, particularly the part below the medium-soft fossil rock has better vertical bearing capacity and slope self-stability capacity, the traditional supporting mode is continuously adopted, the manufacturing cost is high, and the soil layer supporting construction process can encounter some problems in bedrock.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problems, the supporting structure of the hanging foot pile of the soil-rock combined stratum deep foundation pit is simple in structure, convenient to construct, safe and reliable.
The technical scheme adopted by the invention is as follows: the utility model provides an earth rock combines stratum deep basal pit to hang foot stake supporting construction which characterized in that: the foundation pit supporting structure comprises a plurality of foot hanging piles serving as a foundation pit supporting structure, wherein a reinforced concrete beam is arranged at the top of each foot hanging pile, and rock shoulders serving as an embedded structure of a foot hanging pile body are reserved at the bottom of the foundation pit;
a pit inner support used for supporting the foot hanging pile is arranged in the foundation pit, the pit inner support comprises a concrete support which is arranged corresponding to a soil layer part at the top of the foundation pit and connected with the reinforced concrete beam, and a steel pipe support which is arranged corresponding to a soil layer part in the middle of the foundation pit, and the steel pipe support acts on the foot hanging pile through a steel purlin; and the excavation surface of the rock shoulder is enclosed by adopting a soil nail and a reinforced concrete surface layer.
The invention has the beneficial effects that: the foot-hanging pile can fully exert the self-stability capability of the rock mass in the foundation pit rock stratum area, effectively reduce the pile length and the rock-entering depth of the pile body and has great advantages in the aspects of economic benefit and time cost.
The invention effectively limits the displacement and deformation of the enclosure structure of the hanging foot pile through the pit inner support, the soil nails and the reinforced concrete surface layer, and prevents the rock-soil layer of the excavated foundation pit side slope from being damaged. The foundation pit soil layer part is supported by concrete and steel pipes, so that greater rigidity is provided for the foundation pit side slope, and the deformation displacement of the side slope under the passive soil pressure of the foundation pit soil layer part can be better limited; soil nails and reinforced concrete surface layers are adopted at the rock stratum part of the foundation pit to prevent the whole damage of the rock slope and the collapse of local loose rock mass.
The invention gives full play to the advantage that the whole rock slope in the soil-rock combined foundation pit is relatively stable, and the rock slope is reinforced through the system, so that the rock slope is prevented from being damaged, the reserved rock shoulder has better stability to support the load of the foot-hanging pile, and the economic effect is good.
Drawings
Fig. 1 is a schematic structural diagram of the embodiment.
Detailed Description
The embodiment is a soil and rock combined stratum deep foundation pit foot-lifting pile supporting structure, and the soil and rock combined stratum deep foundation pit foot-lifting pile supporting structure is provided with a plurality of foot-lifting piles 7 serving as a foundation pit support structure, wherein a reinforced concrete beam 5 is arranged at the top of each foot-lifting pile, and a rock shoulder serving as an embedded structure of a foot-lifting pile body is reserved at the bottom of a foundation pit.
The foot-hanging pile can fully exert the self-stability capability of the rock mass in the foundation pit rock stratum region, effectively reduce the pile length and the rock-entering depth of the pile body, and has great advantages in the aspects of economic benefit and time cost. The foot-hanging pile 7 is a building enclosure structure which reserves a rock shoulder at the bottom of the foundation pit in the process of excavating the foundation pit, takes the reserved rock shoulder as an embedded structure of a pile body, bears the load from the pile body and ensures the stability of the pile body. In the soil-rock combined foundation pit engineering, the pile body needs to bear the pressure from the excavated part of the rock-soil body, and the main damage forms of the foundation pit are the toppling damage of the pile body under the soil pressure and the integral damage of the rock slope after the failure of the reserved rock shoulder.
In order to prevent the collapse damage of the pile body under the soil pressure and the integral damage of the rock mass side slope after the reserved rock shoulder fails, the pit inner support and the soil nailing and concrete composite reinforcing structure are arranged in the foundation pit.
In the embodiment, the pit inner support is applied to the soil phase stratum at the upper part of the foundation pit so as to limit the deformation displacement of the soil layer part of the foundation pit. The in-pit support comprises a concrete support 2 and a steel pipe support 3, wherein the concrete support is arranged at the top soil layer part of the foundation pit, has the diameter of 800 x 800mm and is positioned at 0.5m below the ground, the concrete support 2 is connected with a reinforced concrete beam 5 at the top of a foot hanging pile 7, and the concrete support exerts acting force on the foot hanging pile 7 through the reinforced concrete beam 5; the steel pipe support 3 is arranged on the soil layer part in the middle of the foundation pit and is made of steel pipes with the diameter of 609 mm multiplied by 16mm, and the steel pipe support 3 acts on the foot hanging piles 7 through the steel purlins 6.
In the embodiment, the soil nail concrete composite reinforced structure comprises soil nails 8 and a reinforced concrete surface layer 9, wherein the excavated surface of the rock mass of the deep foundation pit is enclosed by the soil nails and the reinforced concrete surface layer, four rows of 5m reinforced soil nails with the length of phi 25 are adopted, and a rock surface is hung with a reinforcing mesh with the thickness of phi 8@200 x 200mm and sprayed with C20 concrete with the thickness of 10 cm.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should understand that they can make various changes, additions and substitutions within the scope of the present invention.
Claims (1)
1. The utility model provides an earth rock combines stratum deep basal pit to hang foot stake supporting construction which characterized in that: the foundation pit supporting structure is characterized by comprising a plurality of foot hanging piles (7) serving as a foundation pit supporting structure, wherein a reinforced concrete beam (5) is arranged at the top of each foot hanging pile (7), and rock shoulders serving as an embedded structure of a pile body of each foot hanging pile (7) are reserved at the bottom of the foundation pit;
a pit inner support used for supporting the foot hanging pile (7) is arranged in the foundation pit, the pit inner support comprises a concrete support (2) which is arranged corresponding to a soil layer part at the top of the foundation pit and connected with the reinforced concrete beam (5), and a steel pipe support (3) which is arranged corresponding to a soil layer part in the middle of the foundation pit, and the steel pipe support (3) acts on the foot hanging pile (7) through a steel purlin (6); the excavation surface of the rock shoulder is enclosed by soil nails (8) and a reinforced concrete surface layer (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011251640.1A CN112323815A (en) | 2020-11-11 | 2020-11-11 | Soil rock combines stratum deep basal pit suspension foot stake supporting construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011251640.1A CN112323815A (en) | 2020-11-11 | 2020-11-11 | Soil rock combines stratum deep basal pit suspension foot stake supporting construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112323815A true CN112323815A (en) | 2021-02-05 |
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ID=74318967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011251640.1A Pending CN112323815A (en) | 2020-11-11 | 2020-11-11 | Soil rock combines stratum deep basal pit suspension foot stake supporting construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112323815A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112854245A (en) * | 2021-03-17 | 2021-05-28 | 山东大学 | Classification design method for earth rock foundation pit support based on depth and medium-stroke fossil rock burial depth |
| CN113653068A (en) * | 2021-09-08 | 2021-11-16 | 中建八局第二建设有限公司 | Construction method of deep foundation pit support based on upper soft and lower hard rock stratum |
-
2020
- 2020-11-11 CN CN202011251640.1A patent/CN112323815A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112854245A (en) * | 2021-03-17 | 2021-05-28 | 山东大学 | Classification design method for earth rock foundation pit support based on depth and medium-stroke fossil rock burial depth |
| CN113653068A (en) * | 2021-09-08 | 2021-11-16 | 中建八局第二建设有限公司 | Construction method of deep foundation pit support based on upper soft and lower hard rock stratum |
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