CN111705809A - Deep foundation pit construction structure and deep foundation pit construction method - Google Patents
Deep foundation pit construction structure and deep foundation pit construction method Download PDFInfo
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- CN111705809A CN111705809A CN202010561465.XA CN202010561465A CN111705809A CN 111705809 A CN111705809 A CN 111705809A CN 202010561465 A CN202010561465 A CN 202010561465A CN 111705809 A CN111705809 A CN 111705809A
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- pit construction
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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
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a deep foundation pit construction structure and a deep foundation pit construction method, and relates to the technical field of foundation pits. Technical scheme is a deep basal pit construction structures, including establishing at the foundation ditch lateral wall and the barricade that is enclosed by the stand, under the lower extreme of stand inserted the foundation ditch bottom surface, subaerial the beating outside the foundation ditch is equipped with the reinforcement stake, the upper end of barricade through connect the steel cable with the reinforcement stake is connected. The invention has reasonable structure, stable structure and no occupation of excessive space in the foundation pit.
Description
Technical Field
The invention relates to the technical field of foundation pits, in particular to a deep foundation pit construction structure and a deep foundation pit construction method.
Background
The deep foundation pit refers to a project with an excavation depth of more than 5 meters, or a depth of less than 5 meters, but with particularly complicated geological conditions, surrounding environment and underground pipelines. In order to ensure the safety of underground construction and the surrounding environment of the foundation pit, a supporting structure is generally required to be built on the side wall of the deep foundation pit and the surrounding environment.
A new construction structure and a construction method of a deep foundation pit are proposed.
Disclosure of Invention
The invention aims to provide a deep foundation pit construction structure which is stable and does not occupy too much foundation pit space.
The technical purpose of the invention is realized by the following technical scheme: the utility model provides a deep basal pit construction structures, is including establishhing at the foundation ditch lateral wall and the barricade that encloses by the stand, under the lower extreme of stand inserted the foundation ditch bottom surface, subaerial the beating outside the foundation ditch is equipped with the reinforcement stake, the upper end of barricade through connect the steel cable with the reinforcement stake is connected.
Through adopting above-mentioned scheme, general foundation ditch is only squeezed into the stand a bit and is carried out the enclosure, but such enclosure intensity is little, under the darker circumstances of foundation ditch degree of depth, the stand is easy to fall inwards, factor of safety is low, so some foundation ditches still can set up bracing or support column in the hole with the support post, but will occupy more foundation ditch inner space like this, and this scheme, then consolidate the upper end of stand outside the foundation ditch, it receives fixedly to insert in soil alone under the stand, thereby make the stand possess sufficient intensity to resist the pressure that comes from the outside soil of foundation ditch, and avoided occupying the space in the foundation ditch.
The invention is further configured to: the stand is the bored concrete pile, just the stand is provided with two-layer inside and outside, two-layer crisscross setting between the stand.
Through adopting above-mentioned scheme, the bored concrete pile can be pour before the excavation foundation ditch to pour conveniently, it is effectual to support, and the bored concrete pile that both sides crisscross set up then dispersedly bears the pressure that comes from the outside soil of foundation ditch, makes the enclosure effect of stand better.
The invention is further configured to: larsen steel plates are further driven between the two layers of the stand columns, and the Larsen steel plates are mutually spliced and separate the two layers of the stand columns.
Through adopting above-mentioned scheme, the larsen steel sheet blocks the outside soil of foundation ditch to the larsen steel sheet can also support on the stand, blocks the outside soil of foundation ditch better, prevents to collapse.
The invention is further configured to: the upper end of barricade has been pour the crown beam, the connecting piece has been pour in the crown beam, it connects to connect steel cable one end and connect in on the reinforcement stake, the other end is connected on the connecting piece.
By adopting the scheme, the upper ends of the stand column and the Larsen steel plate are poured together by the aid of the top beam, the connecting piece is poured, the stand column and the Larsen steel plate are integrated, when the pressure of soil outside the foundation pit is applied, the pressure acts on the stand column and the Larsen steel plate, and a part of force is dispersed to each reinforcing pile, so that the overall stability of enclosure is improved, and local collapse is avoided.
The invention is further configured to: the integral cross section of the retaining wall is in a wave shape formed by splicing multiple sections of arches, the crown beam is also in a wave shape, each section of arch is arched outwards the foundation pit in a segmented mode, and the connecting piece is arranged at the junction of each section of arch.
Through adopting above-mentioned scheme, domes can bear bigger power to the bearing capacity can disperse arch tip position, and the pulling force position of reinforcing pile sets up at arch tip position, thereby bears the pressure that comes from earth better, makes the stand be difficult for collapsing.
The invention is further configured to: the connecting piece comprises a connecting rod transversely penetrating through the crown beam and a butt joint disc integrally arranged at one end of the connecting rod, and the inner side surface of the crown beam at the junction of each section of arch is a plane and is abutted to the butt joint disc.
Through adopting above-mentioned scheme, the butt disk butt is connected on the connecting rod at the medial surface of hat roof beam, connects the steel cable, can provide the support for hat roof beam better.
The invention is further configured to: the utility model discloses a steel pipe bracing structure, including barricade, foundation ditch, waist roof beam, upper connecting seat, embedded part, steel pipe bracing, embedded part flange joint, the waist roof beam has still been pour at the inboard middle part of barricade, has pour down the connecting seat in the foundation ditch, the connecting seat has been pour to waist roof beam an organic whole, go up the connecting seat and pour in arch sectionalized juncture, go up the connecting seat all pour the embedded part in the connecting seat down, and be connected with the steel pipe bracing between the two.
Through adopting above-mentioned scheme, set up the steel pipe bracing at the middle part of stand and support, improved the holding capacity of stand, also avoided the stand to buckle because of the too big middle part of atress simultaneously.
The invention also aims to provide a construction method of the deep foundation pit, which is convenient to construct.
The technical purpose of the invention is realized by the following technical scheme: a construction method of a deep foundation pit comprises the steps of S1, site cleaning and leveling; s2, drawing a positioning line, and then driving a Larsen steel plate along the positioning line; s3, utilizing a rotary drilling rig to drill pile holes in a staggered mode on two sides of the Larsen steel plate; s4, placing a reinforcing steel bar frame in the pile hole to complete pouring of the cast-in-place pile; s5, pouring a crown beam at the upper ends of the cast-in-place pile and the Larsen steel plate; s6, excavating a foundation pit, when excavating to half of the depth of the preset foundation pit, pouring a waist beam and an upper connecting seat, simultaneously pouring an embedded part in the connecting seat, and then continuing to excavate the foundation pit until the foundation pit is completed; s7, casting the ground flat surface of the foundation pit, casting a lower connecting seat on the flat surface, and casting embedded parts into the lower connecting seat; and S8, finally, connecting the inclined strut steel pipe between the two embedded parts.
By adopting the scheme, the construction is carried out while digging, the construction is convenient, and the construction efficiency is improved.
The invention is further configured to: when the crown beam is poured, the connecting piece is poured into the crown beam, the reinforcing pile is driven into the ground outside the foundation pit, the driving depth of the reinforcing pile and the distance from the reinforcing pile to the foundation pit are adjusted according to the soil looseness and the excavation depth of the foundation pit, the softer the soil is, the deeper the reinforcing pile is driven into the foundation pit, the deeper the foundation pit is, the farther the reinforcing pile is arranged from the foundation pit, and the reinforcing pile is connected with the connecting piece through a connecting steel cable.
Through adopting above-mentioned scheme, set up the pile degree of depth according to the soil property condition, avoid the soil property soft and the reinforcement degree is not enough.
The invention is further configured to: when the Larsen steel plate and the pile driving hole are driven, the whole body is driven along the wave shape, the crown beam and the waist beam are also cast into the wave shape, the connecting piece is cast at the arch section junction of the wave-shaped crown beam, and the steel pipe inclined strut is also supported at the arch section junction of the wave shape.
By adopting the scheme, the wave-shaped arrangement can better disperse the pressure from the soil outside the foundation pit, so that the support is more stable.
In conclusion, the invention has the following beneficial effects: one is stable in structure and does not occupy space in a foundation pit too much; the second mode is simple structure and convenient construction.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment.
Reference numerals: 1. a column; 2. retaining walls; 3. reinforcing piles; 4. connecting a steel cable; 5. larsen steel plate; 6. a crown beam; 7. a connecting member; 8. a connecting rod; 9. a connecting disc; 10. a wale; 11. a lower connecting seat; 12. an upper connecting seat; 13. embedding parts; 14. and (5) steel pipe diagonal bracing.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a deep foundation pit construction structure includes a retaining wall 2 which is set up on the side wall of the foundation pit and is enclosed by columns 1, the lower ends of the columns 1 are inserted under the ground of the foundation pit, the columns 1 in this embodiment are cast-in-place piles, and the columns 1 are provided with an inner layer and an outer layer, and the two layers of columns 1 are arranged in a staggered manner. The integral cross section of the retaining wall is in a wave shape formed by splicing a plurality of arch shapes, each arch section is arched towards the outside of the foundation pit, and the pressure of the soil outside the foundation pit is dispersed through the arch structure.
Larsen steel plates 5 are further driven between the two layers of the upright columns 1, the Larsen steel plates 5 are mutually spliced and separate the two layers of the upright columns 1, and the Larsen steel plates 5 are used for sealing to further block the soil outside the foundation pit.
The upper end of the retaining wall 2 is poured with a crown beam 6, the upper ends of the upright posts 1 and the Larsen steel plate 5 are both poured in the crown beam 6, and the crown beam 6 is also arranged into a wave shape formed by splicing multiple sections of arch shapes along with the retaining wall 2. And a connecting piece 7 is poured in the top beam 6, a reinforcing pile 3 is driven into the ground outside the foundation pit, and the reinforcing pile 3 and the connecting piece 7 are connected through a connecting steel cable 4. The connecting piece 7 comprises a connecting rod 8 transversely penetrating the crown beam 6 and a butt-joint disc integrally arranged at one end of the connecting rod 8, and the inner side surface of the crown beam 6 at the arch-shaped junction is a plane and is abutted to the butt-joint disc.
Still pour waist rail 10 in the inboard middle part of barricade 2, pour lower connecting seat 11 in the foundation ditch, waist rail 10 is integrative to be poured and is gone up connecting seat 12, goes up connecting seat 12 and pours in arch segmentation's juncture, all pours built-in fitting 13 in going up connecting seat 12, the lower connecting seat 11, and is connected with steel pipe bracing 14 between the two, the both ends of steel pipe bracing 14 respectively with two built-in fitting 13 flange joint.
A construction method of a deep foundation pit comprises the steps of S1, site cleaning and leveling;
s2, drawing a positioning line, drawing the positioning line into a wave shape, and then driving the positioning line into a Larsen steel plate 5;
s3, pile holes are drilled in the two sides of the Larsen steel plate 5 in a staggered mode through a rotary drilling rig;
s4, placing a reinforcing steel bar frame in the pile hole to complete pouring of the cast-in-place pile;
s5, pouring a crown beam 6 at the upper ends of a cast-in-place pile and a Larsen steel plate 5, pouring a connecting piece 7 into the crown beam 6, pouring the connecting piece 7 at the junction of the arch sections of the wave-shaped crown beam 6, driving a reinforcing pile 3 into the ground outside the foundation pit, adjusting the driving depth of the reinforcing pile 3 and the distance from the reinforcing pile 3 to the foundation pit according to the soil quality looseness and the excavation depth of the foundation pit, wherein the softer the soil quality is, the deeper the reinforcing pile 3 is driven, the deeper the foundation pit is, the farther the reinforcing pile 3 is arranged from the foundation pit, and the reinforcing pile 3 is connected with the connecting piece 7 through a connecting steel cable 4;
s6, excavating a foundation pit, when excavating to half of the depth of the preset foundation pit, pouring the waist beam 10 and the upper connecting seat 12, simultaneously pouring the embedded part 13 in the connecting seat, and then continuing to excavate the foundation pit until the foundation pit is completed;
s7, casting the ground flat surface of the foundation pit, casting a lower connecting seat 11 on the flat surface, and casting the embedded part 13 into the lower connecting seat 11;
and S8, finally, connecting an inclined strut steel pipe between the two embedded parts 13, wherein the inclined strut steel pipe is supported at the junction of the wave-shaped arch sections.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a deep basal pit construction structures which characterized in that: including setting up barricade (2) at the foundation ditch lateral wall and enclosed by stand (1), under the lower extreme of stand (1) inserted the foundation ditch bottom surface, subaerial the beating outside the foundation ditch was equipped with reinforced pile (3), the upper end of barricade (2) through connect steel cable (4) with reinforced pile (3) are connected.
2. The deep foundation pit construction structure according to claim 1, wherein: the upright post (1) is a cast-in-place pile, two layers are arranged inside and outside the upright post (1), and the two layers are arranged between the upright posts (1) in a staggered mode.
3. The deep foundation pit construction structure according to claim 2, wherein: larsen steel plates (5) are further driven between the two layers of the upright columns (1), and the Larsen steel plates (5) are mutually spliced and separate the two layers of the upright columns (1).
4. A deep foundation pit construction structure according to claim 3, wherein: crown beam (6) have been pour to the upper end of barricade (2), connecting piece (7) have been pour in crown beam (6), it connects to connect steel cable (4) one end on reinforcement stake (3), the other end is connected on connecting piece (7).
5. The deep foundation pit construction structure according to claim 4, wherein: the integral cross section of the retaining wall is of a wave shape formed by splicing multiple sections of arches, the crown beam (6) is also of a wave shape, each section of arch is arched outwards of the foundation pit in a segmented mode, and the connecting piece (7) is arranged at the junction of each section of arch.
6. The deep foundation pit construction structure according to claim 5, wherein: the connecting piece (7) comprises a connecting rod (8) transversely penetrating through the crown beam (6) and a butt joint disc integrally arranged at one end of the connecting rod (8), and the inner side surface of the crown beam (6) at the junction of each section of arch is a plane and is abutted to the butt joint disc.
7. The deep foundation pit construction structure according to claim 6, wherein: waist rail (10) have still been pour at the inboard middle part of barricade (2), and connecting seat (11) down have been pour in the foundation ditch, connecting seat (12) have been poured to waist rail (10) an organic whole, go up connecting seat (12) and pour in arch sectionalized juncture, go up connecting seat (12) all pour built-in fitting (13) in connecting seat (11) down, and be connected with steel pipe bracing (14) between the two, the both ends of steel pipe bracing (14) respectively with two built-in fitting (13) flange joint.
8. A deep foundation pit construction method for the construction structure of claim 7, characterized in that: including S1, site cleaning and leveling; s2, drawing a positioning line, and then driving a Larsen steel plate (5) along the positioning line; s3, pile holes are drilled in the two sides of the Larsen steel plate (5) in a staggered mode through a rotary drilling rig; s4, placing a reinforcing steel bar frame in the pile hole to complete pouring of the cast-in-place pile; s5, pouring a crown beam (6) at the upper ends of the cast-in-place pile and the Larsen steel plate (5); s6, excavating a foundation pit, when excavating to half of the depth of the preset foundation pit, pouring a waist beam (10) and an upper connecting seat (12), pouring an embedded part (13) in the connecting seat, and then continuously excavating the foundation pit until the foundation pit is completed; s7, casting the ground flat surface of the foundation pit, casting a lower connecting seat (11) on the flat surface, and casting the embedded part (13) into the lower connecting seat (11); and S8, finally, connecting the inclined strut steel pipe between the two embedded parts (13).
9. The deep foundation pit construction method according to claim 8, wherein: when pouring crown beam (6), pour into connecting piece (7) in crown beam (6) to throw into reinforcement stake (3) on the ground outside the foundation ditch, the depth of throwing into of reinforcement stake (3) and the distance of reinforcement stake (3) to the foundation ditch adjust according to soil property looseness and the excavation depth of foundation ditch, soil property is softer, reinforcement stake (3) are thrown into more deeply, the foundation ditch is deeper, reinforcement stake (3) set up and are far away from the foundation ditch, be connected through connecting steel cable (4) between reinforcement stake (3) and connecting piece (7).
10. The deep foundation pit construction method according to claim 9, wherein: when the Larsen steel plate (5) and the pile driving hole are driven, the whole body is driven along a wave shape, the crown beam (6) and the waist beam (10) are also cast into a wave shape, the connecting piece (7) is cast at the junction of the arch sections of the wave-shaped crown beam (6), and the steel pipe inclined strut (14) is also supported at the junction of the wave-shaped arch sections.
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| CN202010561465.XA CN111705809A (en) | 2020-06-18 | 2020-06-18 | Deep foundation pit construction structure and deep foundation pit construction method |
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| CN202010561465.XA CN111705809A (en) | 2020-06-18 | 2020-06-18 | Deep foundation pit construction structure and deep foundation pit construction method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113235610A (en) * | 2021-05-13 | 2021-08-10 | 南通大学 | Foundation pit supporting structure of out-pit arched supporting system and construction method thereof |
| CN113235615A (en) * | 2021-05-27 | 2021-08-10 | 中交投资咨询(北京)有限公司 | Deep foundation pit reinforcing device and construction method thereof |
| CN113356220A (en) * | 2021-06-29 | 2021-09-07 | 大荣建设集团有限公司 | Super high-rise building deep foundation pit and construction method thereof |
| CN113431054A (en) * | 2021-08-05 | 2021-09-24 | 广东中都建筑集团有限公司 | Pile bottom curing diagonal bracing pile foundation pit supporting construction method adopting static pressure implantation method |
| CN114164839A (en) * | 2021-12-08 | 2022-03-11 | 浙大宁波理工学院 | Foundation pit support device and construction method thereof |
| CN115874570A (en) * | 2023-02-17 | 2023-03-31 | 中交第一航务工程局有限公司 | Supporting structure of deep and narrow river channel and construction method thereof |
| CN116677230A (en) * | 2023-05-25 | 2023-09-01 | 浙江金城建设集团有限公司 | Trench deep foundation pit excavation construction protection structure and construction method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113235610A (en) * | 2021-05-13 | 2021-08-10 | 南通大学 | Foundation pit supporting structure of out-pit arched supporting system and construction method thereof |
| CN113235615A (en) * | 2021-05-27 | 2021-08-10 | 中交投资咨询(北京)有限公司 | Deep foundation pit reinforcing device and construction method thereof |
| CN113356220A (en) * | 2021-06-29 | 2021-09-07 | 大荣建设集团有限公司 | Super high-rise building deep foundation pit and construction method thereof |
| CN113431054A (en) * | 2021-08-05 | 2021-09-24 | 广东中都建筑集团有限公司 | Pile bottom curing diagonal bracing pile foundation pit supporting construction method adopting static pressure implantation method |
| CN113431054B (en) * | 2021-08-05 | 2022-07-05 | 广东中都建筑集团有限公司 | Pile bottom curing inclined support pile foundation pit supporting construction method adopting static pressure implantation method |
| CN114164839A (en) * | 2021-12-08 | 2022-03-11 | 浙大宁波理工学院 | Foundation pit support device and construction method thereof |
| CN115874570A (en) * | 2023-02-17 | 2023-03-31 | 中交第一航务工程局有限公司 | Supporting structure of deep and narrow river channel and construction method thereof |
| CN116677230A (en) * | 2023-05-25 | 2023-09-01 | 浙江金城建设集团有限公司 | Trench deep foundation pit excavation construction protection structure and construction method |
| CN116677230B (en) * | 2023-05-25 | 2024-05-17 | 浙江金城建设集团有限公司 | Trench deep foundation pit excavation construction protection structure and construction method |
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Application publication date: 20200925 |