CN115492126A - Steel sheet pile and vertical shaft combined foundation pit supporting structure and method - Google Patents
Steel sheet pile and vertical shaft combined foundation pit supporting structure and method Download PDFInfo
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- CN115492126A CN115492126A CN202211316647.6A CN202211316647A CN115492126A CN 115492126 A CN115492126 A CN 115492126A CN 202211316647 A CN202211316647 A CN 202211316647A CN 115492126 A CN115492126 A CN 115492126A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 121
- 239000010959 steel Substances 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010276 construction Methods 0.000 claims abstract description 58
- 239000002689 soil Substances 0.000 claims abstract description 34
- 238000009412 basement excavation Methods 0.000 claims abstract description 12
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 239000004567 concrete Substances 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 11
- 230000008901 benefit Effects 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 238000009933 burial Methods 0.000 description 3
- 238000009415 formwork Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
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- 239000002356 single layer Substances 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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D11/00—Methods or apparatus specially adapted for both placing and removing sheet pile bulkheads, piles, or mould-pipes
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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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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Abstract
The invention provides a foundation pit supporting structure and a method combining a steel sheet pile and a vertical shaft, wherein the structure comprises a jet grouting pile, the steel sheet pile, a crown beam, a vertical shaft well wall, a vertical shaft bottom plate and a vertical shaft top plate, wherein the vertical shaft bottom plate and the vertical shaft top plate are arranged on the vertical shaft well wall in parallel, and the vertical shaft top plate is positioned right above the vertical shaft bottom plate; the rotary spraying pile is arranged outside the wall of the vertical shaft well, and the lower end of the rotary spraying pile is lower than the lower surface of the vertical shaft bottom plate; the steel sheet pile is arranged outside the jet grouting pile, and the lower end of the steel sheet pile is positioned at the middle lower part of the jet grouting pile; the top beam is arranged at the upper end of the wall of the vertical shaft well, and the lower end of the bottom plate of the vertical shaft is provided with a cushion layer. In the invention, the upper half part of the foundation pit adopts a supporting mode of the steel sheet pile, so that the construction is flexible and convenient, and the foundation pit can be disassembled and recycled; adopt the jet grouting pile to consolidate the soil body between the reverse construction's of steel sheet pile and the latter half shaft, the jet grouting pile has solved the interior soil body excavation of the latter half shaft within range when acting as waterproof curtain, and the steel sheet pile inlays the risk of toppling that the degree of depth is not enough to cause.
Description
Technical Field
The invention belongs to the technical field of municipal infrastructure, and particularly relates to a steel sheet pile and shaft combined foundation pit supporting structure and method.
Background
A certain municipal underground pipeline project is located in a collapsible loess area, a work well of the project is located in a busy road section of a city center, and the project environment around the site is very complex. For the underground engineering with complex boundary conditions, a reverse construction method shaft technology is usually adopted for construction, namely, shaft walls and various layer structures of the shaft are excavated layer by layer from the ground to the bottom until the bottom plate is sealed, so that the influence on surrounding roads and buildings is reduced.
When the working well top plate is buried deeply and the number of underground pipelines planned in the later period in the range above the top plate is large, if a supporting mode of a pure reverse construction method is adopted, after the construction of the main structure of the process well is finished, the reverse construction concrete well wall above the top plate needs to be dismantled, a large number of construction periods and costs are consumed for the reinforcement binding and concrete pouring of the part of well wall in the early period of construction and the dismantling in the later period of construction, and the economic benefit is poor. Meanwhile, in the later-stage dismantling process, the side wall of the foundation pit above the top plate faces the risk of collapse caused by no support.
The traditional steel sheet pile support has the characteristics of quick and convenient construction, good durability and high secondary utilization rate; but is limited by the length of the pile, the supporting depth is limited, the lateral stiffness is relatively small, and the waterproof performance is poor. The reverse construction method construction vertical shaft integrates the temporary enclosure wall of the foundation pit and the permanent vertical shaft outer wall, so that the space occupied by the enclosure structure is saved, the rigidity is high, and the waterproof performance is good; the defects are that the processes of binding the reinforcing steel bars and the like are complicated and time-consuming, the requirement on construction precision is high, and the economy is poorer compared with other building envelopes.
Disclosure of Invention
In order to overcome the problems that a large number of construction periods and cost are consumed for demolition in the later construction period, the economic benefit is poor, and meanwhile, in the later demolition process, a foundation pit and a side wall above a top plate of a vertical shaft face collapse caused by no support, the invention provides a steel sheet pile and vertical shaft combined foundation pit supporting structure and method, in the invention, the upper half part of the foundation pit adopts a steel sheet pile supporting mode, and the steel sheet pile supporting construction is flexible, convenient and fast, detachable and recyclable; adopt the jet grouting pile to consolidate the soil body between the reverse construction's of steel sheet pile and the latter half shaft, the jet grouting pile has solved the interior soil body excavation of the latter half shaft within range when acting as waterproof curtain, and the steel sheet pile inlays the risk of toppling that the degree of depth is not enough to cause.
The technical scheme adopted by the invention is as follows:
a foundation pit supporting structure combining a steel sheet pile and a vertical shaft comprises a jet grouting pile, the steel sheet pile, a crown beam, a vertical shaft well wall, a vertical shaft bottom plate and a vertical shaft top plate, wherein the vertical shaft bottom plate and the vertical shaft top plate are arranged on the vertical shaft well wall in parallel, and the vertical shaft top plate is positioned right above the vertical shaft bottom plate; the rotary jet grouting pile is arranged outside the wall of a vertical shaft well, and the lower end of the rotary jet grouting pile is lower than the lower surface of a vertical shaft bottom plate; the steel sheet pile is arranged outside the jet grouting pile, and the lower end of the steel sheet pile is positioned at the middle lower part of the jet grouting pile; the top beam is arranged at the upper end of the wall of the vertical shaft well, and the lower end of the bottom plate of the vertical shaft is provided with a cushion layer.
The jet grouting pile adopts a single-tube high-pressure jet grouting pile, wherein the part of the jet grouting pile above the vertical shaft top plate is a jet grouting pile empty pile, and the part of the jet grouting pile below the vertical shaft top plate is a jet grouting pile solid pile.
The diameter of the jet grouting pile is 600mm to 800mm, and the jet grouting reinforcement depth is within a range from the ground to the position below a shaft bottom plate and not less than 1.5 m.
And a plurality of horizontal inner supports are arranged at the middle upper part of the steel sheet pile.
The horizontal inner support is fixed on the steel sheet pile through a steel purlin and an angle steel bracket.
And corner supports are arranged at four corners of the steel sheet pile.
The lower end of the steel sheet pile is lower than the position of the top plate of the vertical shaft and higher than the position of the bottom plate of the vertical shaft.
The cushion layer is thick plain concrete with the thickness of at least 150 mm.
A foundation pit supporting method combining a steel sheet pile and a vertical shaft comprises the following specific steps:
firstly, performing rotary spraying reinforcement on soil around a vertical shaft through a rotary spraying pile before driving a steel sheet pile and excavating a foundation pit;
driving steel sheet piles after the construction of the jet grouting piles is finished, and excavating soil above a vertical shaft top plate after the driving of the steel sheet piles is finished;
step three, erecting the horizontal inner supports on the steel sheet piles one by one from top to bottom along with excavation of soil above a vertical shaft top plate and soil at the empty pile of the jet grouting pile;
step four, constructing a vertical shaft wall below a vertical shaft top plate;
step five, after the construction of the shaft wall of the shaft is finished, constructing a cushion layer below the bottom plate of the shaft and the bottom plate of the shaft, and finally constructing a top plate of the shaft and other required structures in the shaft;
and step six, after the construction of the top plate of the vertical shaft is completed, backfilling the soil above the top plate of the vertical shaft, and dismantling and recycling the steel sheet piles and the horizontal inner supports.
In the fourth step, the construction of the vertical shaft wall is implemented from top to bottom in sections, and the height of each section of the shaft wall is 1m to 2m; when the earthwork is excavated to a depth of 1m to 2m below the elevation of a vertical shaft top plate, a first section of vertical shaft wall and a crown beam at the top of the vertical shaft wall can be constructed; and after the construction of the first section of well wall is finished, continuously downwards excavating earthwork within the range of 1m-2m, constructing a second section of vertical well wall, and circulating the steps until the elevation of a vertical well bottom plate is reached.
The invention has the beneficial effects that:
1) The supporting mode of the steel sheet pile is adopted in the upper half part of the foundation pit, the characteristics that the steel sheet pile is flexible and convenient to support and construct, can be disassembled for recycling and has shallow supporting depth are fully utilized, and under the condition that the burial depth of a vertical shaft top plate is large, the labor cost and the economic cost caused by upper wall body reinforcement binding, formwork pouring and later-stage wall body chiseling are avoided, and the collapse risk of the foundation pit side wall soil body above the top plate without supporting is greatly reduced.
2) Adopt the jet grouting pile to consolidate the soil body between the wall of a shaft of steel sheet pile and the latter half shaft, the jet grouting pile has solved the toppling risk that the steel sheet pile consolidation depth is not enough and leads to after the soil body excavation in the shaft scope of the latter half when acting as waterproof curtain. The jet grouting pile is a hollow pile, so that the amount of sprayed cement paste is saved, and excavation of earthwork and the jet grouting pile on the upper part of the shaft top plate is facilitated when the steel sheet pile is erected for internal support.
3) And under the condition that the side wall of the upper half part of the foundation pit is effectively supported by using the steel sheet piles, the construction vertical shaft of the lower half part adopts a reverse construction method process, and construction is carried out from top to bottom from the elevation position of the top plate of the vertical shaft. The permanent vertical shaft concrete outer wall, namely the vertical shaft wall, is also used as a temporary foundation pit supporting structure, so that the lateral deformation control capability is strong, the additional construction cost of foundation pit supporting is reduced, and a good technical and economic effect is generated.
In order to make the aforementioned and other objects of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Figure 1 is a schematic plan view of the support structure of the present invention.
Fig. 2 is a schematic cross-sectional view of the supporting structure of the present invention.
In the figures, the reference numbers are: 1. steel sheet piles; 2. an angle iron bracket; 3. steel purlin; 4. a horizontal inner support; 5. supporting the corner; 6. carrying out jet grouting pile emptying; 7. carrying out jet grouting pile compaction; 8. a crown beam; 9. a shaft wall; 10. a cushion layer; 11. a shaft floor; 12. and (4) a shaft top plate.
Detailed Description
Example 1:
in order to overcome the problems that the existing construction later-stage demolition consumes a large number of construction periods and costs, and has poor economic benefits, and meanwhile, in the later-stage demolition process, a foundation pit and a side wall above a vertical shaft top plate face collapse caused by no support, the invention provides a steel sheet pile and vertical shaft combined foundation pit supporting structure and method as shown in figures 1 and 2, in the invention, the upper half part of the foundation pit adopts a steel sheet pile supporting mode, and the steel sheet pile supporting construction is flexible, convenient and fast, and can be disassembled and recycled; adopt the jet grouting pile to consolidate the soil body between the steel sheet pile and the lower half shaft of reverse construction, the jet grouting pile has solved the interior soil body excavation of lower half shaft scope back, the steel sheet pile inlays the risk of toppling that the not enough result in of degree of depth when acting as waterproof curtain.
A foundation pit supporting structure combining a steel sheet pile and a vertical shaft comprises a jet grouting pile, the steel sheet pile 1, a crown beam 8, a vertical shaft well wall 9, a vertical shaft bottom plate 11 and a vertical shaft top plate 12, wherein the vertical shaft bottom plate 11 and the vertical shaft top plate 12 are arranged on the vertical shaft well wall 9 in parallel, and the vertical shaft top plate 12 is positioned right above the vertical shaft bottom plate 11; the jet grouting pile is arranged outside a vertical shaft wall 9, and the lower end of the jet grouting pile is lower than the lower surface of a vertical shaft bottom plate 11; the steel sheet pile 1 is arranged outside the jet grouting pile, and the lower end of the steel sheet pile 1 is positioned at the middle lower part of the jet grouting pile; the crown beam 8 is arranged at the upper end of a shaft well wall 9, and the lower end of a shaft bottom plate 11 is provided with a cushion layer 10.
In the invention, as shown in fig. 1, a steel sheet pile 1 is arranged at the periphery of a jet grouting reinforced soil body, after the jet grouting pile construction is finished, the steel sheet pile 1 is driven, preferably, an IV-type Larsen steel sheet pile is adopted as the steel sheet pile 1, the pile length is 9m to 15m, and the method is determined according to the burial depth of a shaft top plate 12. And after the steel sheet pile 1 is driven, the soil above the vertical shaft top plate 12 can be excavated.
According to the invention, the lower part of the vertical shaft top plate 12 is constructed by adopting a reverse method, the vertical shaft wall 9 is implemented from top to bottom in sections, the construction of the vertical shaft bottom plate 11 is carried out after the construction of the vertical shaft wall 9 by adopting the reverse method is completed, and finally the vertical shaft top plate 12 and other structures in the vertical shaft are constructed. And after the shaft construction of the reverse construction method is completed, backfilling the soil above a shaft top plate 12, and dismantling and recycling a steel sheet pile supporting system.
The invention adopts the supporting mode of the steel sheet pile 1, and fully utilizes the characteristics of flexible and convenient supporting construction, detachable recycling and shallow supporting depth of the steel sheet pile 1. Under the great condition of the shaft roof 12 buried depth, avoided upper portion wall body reinforcement, formwork pouring, later stage wall body chisel to remove the artifical and economic cost that leads to, greatly reduced the foundation ditch lateral wall soil body above the shaft roof 12 does not have the risk of collapsing of strutting. Adopt the jet grouting pile to consolidate the soil body between the reverse shaft of the latter half and steel sheet pile 1, the jet grouting pile has solved the toppling risk that the insufficient depth of steel sheet pile 1 consolidation leads to after the soil body excavation of the latter half shaft within range when acting as waterproof curtain.
Example 2:
based on embodiment 1, in this embodiment, preferably, the jet grouting pile adopts a single-pipe high-pressure jet grouting pile, where the part of the jet grouting pile above the shaft roof 12 is a jet grouting pile empty pile 6, and below the shaft roof 12 is a jet grouting pile solid pile 7.
Preferably, the pile diameter of the jet grouting pile is 600mm-800mm, and the jet grouting reinforcement depth is within a range from the ground to a position below a shaft bottom plate 11 and is not less than 1.5 m.
In the invention, the pile diameter of the jet grouting pile is selected and determined according to requirements, and the pile diameter of the jet grouting pile is preferably 650mm, 700mm, 750mm, 780mm and 800mm. In the invention, the jet grouting pile is the prior art, and further description is not provided in the invention.
In the invention, a high-pressure jet grouting pile is adopted between the steel sheet pile 1 and the reverse shaft well wall 9 of the lower half part, and the jet grouting pile serves as a waterproof curtain and solves the overturning risk caused by insufficient embedding depth of the steel sheet pile 1 after the soil body in the range of the lower half part of the shaft is excavated.
In the invention, the rotary jet grouting pile above the vertical shaft top plate 12 adopts a hollow pile, thereby not only saving the consumption of sprayed cement slurry, but also facilitating the excavation and removal of the earthwork and the rotary jet grouting pile on the upper part of the vertical shaft top plate 12 when the inner support of the steel sheet pile 1 is erected.
Preferably, a plurality of horizontal inner supports 4 are arranged at the middle upper part of the steel sheet pile 1.
Preferably, the horizontal inner support 4 is fixed on the steel sheet pile 1 through a steel purlin 3 and an angle steel bracket 2.
In the invention, as shown in fig. 2, the horizontal inner support 4 is preferably a steel pipe with the diameter of 250 × 10, one or more channels are arranged according to different burial depths of a shaft top plate 12, and the steel pipe support is connected with a steel sheet pile 1 through an angle steel bracket 2 and a steel surrounding purlin 3 to jointly form a steel sheet pile support system. The horizontal inner supports 4 are erected channel by channel along with the excavation of earthwork and jet grouting reinforced soil above the vertical shaft top plate 12.
Preferably, corner supports 5 are arranged at four corners of the steel sheet pile 1.
Preferably, the lower end of the steel sheet pile 1 is lower than the shaft top plate 12 and higher than the shaft bottom plate 11.
Preferably, the cushion layer 10 is thick plain concrete with a thickness of at least 150 mm.
In the invention, the upper half part of the foundation pit adopts a supporting mode of the steel sheet pile 1, the characteristics of flexible and convenient supporting construction, detachability and recycling and shallow supporting depth of the steel sheet pile 1 are fully utilized, and under the condition that the buried depth of the top plate 12 of the reverse shaft is large, the labor and economic costs caused by the binding of upper wall reinforcing steel bars, the pouring of a supporting formwork and the later-stage wall chiseling are avoided, and the collapse risk of the foundation pit side wall soil body above the top plate without supporting is greatly reduced.
The jet grouting pile adopts a single-pipe high-pressure jet grouting pile, the diameter of the pile is 600mm, the length of the pile is 13.15m, the part above a vertical shaft top plate 12 is a jet grouting pile empty pile 6, and the part below the vertical shaft top plate 12 is a jet grouting pile solid pile 7.
In the invention, the steel sheet pile 1 is an IV-type Larsen steel sheet pile, and the pile length is preferably 9m. The horizontal inner supports 4 are preferably provided with two horizontal inner supports, the distance from the horizontal inner supports to the ground is 0.5m and 3.5m respectively, meanwhile, corner supports 5 are respectively arranged at four corners of the foundation pit, and the corner supports 5 are preferably phi 250 multiplied by 10 steel pipe supports. Interior support 4 of level is connected with steel sheet pile 1 through angle steel support 2 and steel purlin 3, and angle steel support 2 adopts L63X 5, and its size unit is mm, and steel purlin 3 adopts HW300X300X10X15, and its size unit is mm.
In the invention, the lower structures of the vertical shaft constructed by the reverse construction method, namely the vertical shaft top plate 12, the vertical shaft bottom plate 11 and the vertical shaft wall 9, adopt single-layer C30 reinforced concrete structures, and the clearance size is 8m6m4m5m. The thickness of the shaft top plate 12 is preferably 400mm, and the upper part soil covering depth is 6m. The thickness of the shaft wall 9 is preferably 600mm, the thickness of the shaft bottom plate 11 is preferably 600mm, and a plain concrete cushion layer 10 with the thickness of 150mm is preferably arranged below the shaft bottom plate 11. And the top of the shaft wall 9 is provided with a 500mm 800mm reinforced concrete crown beam 8.
Example 3:
based on the foundation of embodiment 1 or 2, the embodiment provides a foundation pit supporting method combining a steel sheet pile and a vertical shaft, which specifically comprises the following steps:
firstly, performing rotary spraying reinforcement on soil around a vertical shaft through a rotary spraying pile before driving a steel sheet pile 1 and excavating a foundation pit;
step two, driving the steel sheet pile 1 after the construction of the jet grouting pile is finished, and excavating the soil body above a vertical shaft top plate 12 after the driving of the steel sheet pile 1 is finished;
thirdly, erecting the horizontal inner supports 4 on the steel sheet piles 1 from top to bottom along with the excavation of the soil above a vertical shaft top plate 12 and the soil at the position of the jet grouting pile empty pile 6;
step four, constructing a vertical shaft wall 9 below a vertical shaft top plate 12;
step five, after the construction of the shaft wall 9 is completed, constructing a cushion layer 10 below a shaft bottom plate 11 and the shaft bottom plate 11, and finally constructing a shaft top plate 12 and other structures required in the shaft;
and step six, after the construction of the vertical shaft top plate 12 is completed, backfilling the soil above the vertical shaft top plate 12, and dismantling and recovering the steel sheet pile 1 and the horizontal inner support 4.
In the fourth step, the construction of the vertical shaft wall 9 is implemented section by section from top to bottom, and the height of each section of the shaft wall is 1m to 2m; when the earthwork is excavated to a depth of 1m to 2m below the elevation of a vertical shaft top plate 12, a first section of vertical shaft wall 9 and a crown beam 8 at the top of the vertical shaft wall can be constructed; and after the construction of the first section of well wall is finished, continuously excavating earthwork within the range of 1m-2m downwards, constructing a second section of vertical well wall 9, and circulating the steps until the elevation of a vertical well bottom plate 11 is reached.
In the invention, under the condition that the side wall of the upper half part of the foundation pit is effectively supported by using the steel sheet pile 1, the construction vertical shaft of the lower half part adopts a reverse construction method process, and construction is carried out from top to bottom from the elevation position of a vertical shaft top plate 12. The permanent vertical shaft concrete outer wall, namely the vertical shaft wall 9, is also used as a temporary foundation pit supporting structure, the lateral deformation control capability is strong, the extra construction cost of foundation pit supporting is reduced, and a good technical and economic effect is generated.
The steel sheet pile supporting system comprises a steel sheet pile 1, an angle steel bracket 2, a steel purlin 3 and a horizontal inner support 4. The shaft well wall 9, the shaft bottom plate 11 and the shaft top plate 12 constructed by the reverse construction method are main structures and are also used as a foundation pit supporting structure.
The invention combines a steel sheet pile supporting system with a concrete shaft supporting structure for use, wherein the concrete shaft supporting structure comprises a crown beam 8, a shaft well wall 9, a shaft bottom plate 11 and a shaft top plate 12; when providing reliable excavation supporting, full play steel sheet pile support construction and demolish quick advantage, also broken the limitation of traditional reverse construction method shaft simultaneously, avoided shaft roof 12 above the shaft wall of a well 9 demolish extra time cost, economic cost that bring. The method can be quickly and conveniently implemented under the conditions of urgent construction period of municipal projects, complex surrounding environment of the foundation pit and more limiting conditions, obtains good social and economic benefits, and has good application prospect in the municipal engineering field such as urban underground pipeline engineering and the like.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention. The apparatus structure and the method steps thereof, which are not described in detail in the present invention, are prior art and will not be further described in the present invention.
Claims (10)
1. The utility model provides a steel sheet pile and shaft combined foundation ditch supporting construction which characterized in that: the jet grouting pile comprises a jet grouting pile, a steel sheet pile (1), a top beam (8), a vertical shaft well wall (9), a vertical shaft bottom plate (11) and a vertical shaft top plate (12), wherein the vertical shaft bottom plate (11) and the vertical shaft top plate (12) are arranged on the vertical shaft well wall (9) in parallel, and the vertical shaft top plate (12) is positioned right above the vertical shaft bottom plate (11); the jet grouting pile is arranged outside a vertical shaft wall (9), and the lower end of the jet grouting pile is lower than the lower surface of a vertical shaft bottom plate (11); the steel sheet pile (1) is arranged outside the jet grouting pile, and the lower end of the steel sheet pile (1) is positioned at the middle lower part of the jet grouting pile; the top beam (8) is arranged at the upper end of a shaft wall (9), and the lower end of a shaft bottom plate (11) is provided with a cushion layer (10).
2. The foundation pit supporting structure of steel sheet pile and shaft combination according to claim 1, characterized in that: the jet grouting pile adopts a single-tube high-pressure jet grouting pile, wherein the part of the jet grouting pile above a vertical shaft top plate (12) is a jet grouting pile empty pile (6), and a jet grouting pile solid pile (7) is arranged below the vertical shaft top plate (12).
3. The foundation pit supporting structure of the combination of the steel sheet pile and the vertical shaft as claimed in claim 1, wherein: the pile diameter of the jet grouting pile is 600mm-800mm, and the jet grouting reinforcement depth is within the range of not less than 1.5m from the ground to the position below a shaft bottom plate (11).
4. The foundation pit supporting structure of the combination of the steel sheet pile and the vertical shaft as claimed in claim 1, wherein: the middle upper part of the steel sheet pile (1) is provided with a plurality of horizontal inner supports (4).
5. The foundation pit supporting structure of steel sheet pile and shaft combination according to claim 4, characterized in that: the horizontal inner support (4) is fixed on the steel sheet pile (1) through a steel surrounding purlin (3) and an angle steel bracket (2).
6. The foundation pit supporting structure of the combination of the steel sheet pile and the vertical shaft as claimed in claim 1, wherein: and corner supports (5) are arranged at four corners of the steel sheet pile (1).
7. The foundation pit supporting structure of the combination of the steel sheet pile and the vertical shaft as claimed in claim 1, wherein: the lower end of the steel sheet pile (1) is lower than the position of the shaft top plate (12) and higher than the position of the shaft bottom plate (11).
8. The foundation pit supporting structure of the combination of the steel sheet pile and the vertical shaft as claimed in claim 1, wherein: the cushion layer (10) is thick plain concrete with the thickness of at least 150 mm.
9. A foundation pit supporting method combining a steel sheet pile and a vertical shaft is characterized in that: the method comprises the following specific steps:
firstly, performing rotary spraying reinforcement on soil around a vertical shaft through a rotary spraying pile before driving a steel sheet pile (1) and excavating a foundation pit;
secondly, driving the steel sheet pile (1) after the construction of the jet grouting pile is finished, and excavating the soil body above the vertical shaft top plate (12) after the driving of the steel sheet pile (1) is finished;
thirdly, the horizontal inner supports (4) are erected on the steel sheet piles (1) from top to bottom along with the excavation of the soil above the vertical shaft top plate (12) and the soil at the jet grouting pile empty pile (6);
step four, constructing a vertical shaft wall (9) below the vertical shaft top plate (12);
step five, after the construction of the shaft wall (9) of the shaft is completed, constructing a cushion layer (10) below a shaft bottom plate (11) and the shaft bottom plate (11), and finally constructing a shaft top plate (12) and other structures required in the shaft;
and sixthly, after the construction of the vertical shaft top plate (12) is completed, backfilling the soil above the vertical shaft top plate (12), and dismantling and recovering the steel sheet pile (1) and the horizontal inner support (4).
10. The foundation pit supporting method of the combination of the steel sheet pile and the vertical shaft according to claim 9, wherein: in the fourth step, the construction of the vertical shaft wall (9) is implemented from top to bottom in sections, and the height of each section of the shaft wall is 1m to 2m; when the earth is excavated to the depth of 1m to 2m below the elevation of a vertical shaft top plate (12), a first section of vertical shaft wall (9) and a top beam (8) thereof can be constructed; and after the construction of the first section of well wall is finished, continuously excavating earthwork within the range of 1m-2m downwards, constructing a second section of vertical well wall (9), and circulating the steps until the elevation of a vertical well bottom plate (11).
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| CN202211316647.6A CN115492126B (en) | 2022-10-26 | Foundation pit supporting structure and method for combining steel sheet piles and vertical shafts |
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| CN112049650A (en) * | 2020-09-16 | 2020-12-08 | 中国铁路设计集团有限公司 | Method for expanding and excavating existing small shield tunnel by using large shield |
| CN113882390A (en) * | 2021-09-15 | 2022-01-04 | 深圳市综合交通设计研究院有限公司 | Subway tunnel construction shaft foundation pit supporting structure without inner support and construction method |
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| JPS55111525A (en) * | 1979-02-16 | 1980-08-28 | Hajime Matsuzawa | Method of construction of underground sheet pile wall |
| JPH07292665A (en) * | 1994-04-22 | 1995-11-07 | Hiroshi Ikeda | Construction method of enhanced pile |
| CN103982188A (en) * | 2014-06-03 | 2014-08-13 | 中铁第一勘察设计院集团有限公司 | Supporting structure system of rock stratum large-section deep vertical shaft and construction method of supporting structure system |
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| CN111851588A (en) * | 2020-07-14 | 2020-10-30 | 中国能源建设集团广东省电力设计研究院有限公司 | Pipe jacking well structure and construction method thereof |
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