CN113431097A - Protection structure of shallow foundation building next to deep foundation pit engineering and construction method - Google Patents
Protection structure of shallow foundation building next to deep foundation pit engineering and construction method Download PDFInfo
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- CN113431097A CN113431097A CN202110548526.3A CN202110548526A CN113431097A CN 113431097 A CN113431097 A CN 113431097A CN 202110548526 A CN202110548526 A CN 202110548526A CN 113431097 A CN113431097 A CN 113431097A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
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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
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
Abstract
The application relates to a protection structure and a construction method of a shallow foundation building next to a deep foundation pit project, which comprises deep pile foundations arranged next to an original shallow foundation building, wherein the upper ends of the deep pile foundations are connected with connecting beams, and the connecting beams are connected with ring beams of the original shallow foundation building; and grouting and reinforcing the soil body between the deep pile foundation and the newly-built deep foundation pit support structure to form a grouting reinforcing layer, embedding sleeve valve pipes at the bottom of the original shallow foundation building, and simultaneously adopting a process of reversing first and then reversing second for deep foundation pit engineering construction. The application reduces the disturbance of deep foundation pit engineering to the former shallow foundation building of close proximity greatly with "initiative + passive" protection thinking, reaches the effect that improves former shallow foundation building stability.
Description
Technical Field
The application relates to the field of building engineering, in particular to a protection structure of a shallow foundation building next to a deep foundation pit engineering and a construction method.
Background
Along with the continuous development of cities, land resources are increasingly tense, some municipal works and building works in cities are constructed next to the existing building by inevitable 'joint pins', and some new works are very close to the existing building or even less than 2 meters away from the existing building, so that the original building is inevitably disturbed.
In view of the above-mentioned related technologies, the inventor believes that many house buildings constructed in cities before 2000 in particular are shallow foundation structures which are extremely sensitive to soil deformation/groundwater level fluctuation, and when deep foundation pit engineering is performed next to these shallow foundation buildings, the consequences of building settlement, deformation, cracking and the like are extremely easy to cause.
Disclosure of Invention
In order to protect a shallow foundation structure and ensure construction safety quality, the application provides a protection structure and a construction method for a shallow foundation building close to a deep foundation pit project.
In a first aspect, the application provides a protection structure for a shallow foundation building next to a deep foundation pit engineering, which adopts the following technical scheme:
a protection structure of a shallow foundation building next to a deep foundation pit engineering comprises deep pile foundations arranged next to an original shallow foundation building, wherein the upper ends of the deep pile foundations are connected with connecting beams, and the connecting beams are connected with ring beams of the original shallow foundation building; and a grouting reinforcement layer is also arranged between the deep pile foundation and the newly-built deep foundation pit.
By adopting the technical scheme, the pile foundation arranged on the side wall of the original shallow foundation building can play a role in protecting between the deep foundation pit engineering and the original shallow foundation building, and the influence of the deep foundation pit engineering on the original shallow foundation building is reduced; the connecting beams formed on the pile foundations are connected with the ring beams of the original shallow foundation building, so that a plurality of pile foundations are connected with the original shallow foundation building into a whole, and the plurality of pile foundations bear the deformation of the original shallow foundation building, so that when the soil body at the bottom of the building and the water level change cause settlement, uplift or deformation, the original shallow foundation building deforms along with the deformation of the soil body and can be transmitted to the connecting beams along with the ring beams and then transmitted to the pile foundations, and the pile foundations can provide stable jacking force or uplift force, thereby greatly inhibiting the deformation of the original shallow foundation building and further reducing the influence of deep foundation pit construction on the original shallow foundation building;
and meanwhile, a grouting reinforcement layer is arranged between the pile foundation and the deep foundation pit, so that the grouting reinforcement layer is used for reinforcing the soil body between the deep foundation pit and the original shallow foundation building, an isolation layer is formed, the underground water level fluctuation in the soil body is reduced, the deformation of the deep foundation pit and the deformation and water level change of the soil body at the bottom and the peripheral area of the original shallow foundation building caused by drainage are further reduced, and the stability of the original shallow foundation building is further improved.
Optionally, bar-embedded steel bars are arranged between the connecting beam and the ring beam of the original shallow foundation building, and the connecting beam is formed by firstly binding the steel bars and then pouring concrete.
Through adopting above-mentioned technical scheme, utilize and set up the bar planting reinforcing bar between ring roof beam and pile foundation, carry out concrete placement again and form even roof beam, make its even roof beam of pouring shaping and ring roof beam, pile foundation solidify in an organic whole, reinforcing pile foundation and the stable connectivity between the ring roof beam, improve the stable effort of pile foundation to former shallow foundation building.
Optionally, the construction method further comprises a grouting pipe obliquely placed below the original shallow foundation building, and one end of the grouting pipe extends out of the ground on one side of the pile foundation.
By adopting the technical scheme, after the construction of the deep foundation pit is completed, the soil body under the original shallow foundation building can be subjected to supplementary grouting reinforcement and filled with the settled soil body through the grouting pipe according to the settlement deformation condition of the soil body, the foundation under the original shallow foundation building is stably reinforced, and the deformation of the original shallow foundation building is further reduced.
In a second aspect, the present application provides a deep foundation pit construction method next to a shallow foundation building, which adopts the following technical scheme:
a construction method of a deep foundation pit adjacent to a shallow foundation building comprises the following steps:
By adopting the technical scheme, the deep pile foundation is connected with the ring beam of the original shallow foundation building, so that the foundation force of the original shallow foundation building can be improved, and meanwhile, a reinforcing layer is formed by grouting between the shallow foundation building and the deep foundation pit, so that the disturbance of deep foundation pit engineering on the original shallow foundation building can be reduced, and the influence of the original shallow foundation building on the construction of the deep foundation pit is reduced;
and then the deep foundation pit adopts the construction mode of' reverse first and then forward first, after the roof, the middle plate and the bottom plate are constructed layer by layer first, then the side wall is constructed, because after the roof and the middle plate, the middle plate and the bottom plate are directly excavated (at the moment, the roof, the middle plate, the bottom plate and the enclosure structure form a stable cavity), then the side wall between the middle plate and the bottom plate and between the middle plate and the roof is constructed, the extrusion force to the soil body in the construction process of the side wall can be reduced, thereby the disturbance to the soil body in the peripheral area in the construction process can be reduced, and further the influence to the original shallow foundation building can be reduced.
Optionally, in step 1, pile top concrete is removed after the construction of the deep pile foundation, then a ring beam of the original shallow foundation building is excavated and steel bars are planted, the steel bars are integrally connected with the ring beam and the top steel bars of the deep pile foundation, and then formwork is erected to pour concrete, so that a connecting beam integrated with the ring beam and the deep pile foundation is formed.
Through adopting above-mentioned technical scheme, utilize bar planting reinforcing bar and the whole back of deep pile foundation top steel bar connection, the concrete of pouring again forms the even roof beam integrative with collar tie beam, deep pile foundation, can strengthen the stability of being connected between former shallow foundation building and the deep pile foundation to improve the stable effort of deep pile foundation to former shallow foundation building.
Optionally, in step 2, before the reinforcing layer is formed by grouting, a grouting pipe is pre-buried under the original shallow foundation building, the grouting pipe is obliquely arranged, the opening end of the grouting pipe extends to the ground on one side of the deep pile foundation, and the grouting pipe opening is blocked.
By adopting the technical scheme, after the construction of the deep foundation pit is completed, the soil body under the original shallow foundation building can be subjected to supplementary grouting reinforcement and filled with the settled soil body through the grouting pipe according to the settlement deformation condition of the soil body, the foundation under the original shallow foundation building is stably reinforced, and the deformation of the original shallow foundation building is further reduced.
Optionally, in step 3, during the construction of the enclosure structure, a reinforcing steel bar connector connected with the top plate and the middle plate is reserved on the inner side of the enclosure structure.
By adopting the technical scheme, the construction of the subsequent top plate and the middle plate is facilitated by utilizing the steel bar connector preset on the inner side of the enclosure structure, the stable connectivity among the top plate, the middle plate and the enclosure structure can be improved, and the subsequent construction is facilitated; and the bottom plate is directly abutted against the ground soil, so that the connection with the enclosure structure through the steel bar connector is not needed, and the stability is very high.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the pile foundation is added on the side wall of the original shallow foundation building and is connected with the ring beam of the original shallow foundation building, so that the stability of the original shallow foundation building can be enhanced, the tendency that the original shallow foundation building is deformed by soil deformation is reduced, and the stability of the original shallow foundation building is ensured;
a reinforcing layer is formed between the pile foundation and the deep foundation pit by grouting, and underground water level fluctuation in a soil body in the construction process of the deep foundation pit can be reduced, so that deformation and water level change of the soil body around the original shallow foundation building caused by deformation of the deep foundation pit or drainage are reduced, and the stability of the original shallow foundation building is further improved;
2. the deep foundation pit adopts a construction mode of 'reverse first and then forward', the top plate, the middle part and the bottom plate are constructed layer by layer first, and then the side wall is constructed, so that the extrusion force to the soil body in the construction process can be reduced, the disturbance to the soil body in the peripheral area in the construction process can be reduced, and the influence on the original shallow foundation building can be further reduced.
Drawings
Fig. 1 is a schematic view of step 1 of a deep foundation pit construction method next to a shallow foundation structure according to an embodiment of the present application.
Fig. 2 is a top view of the structure of the deep foundation pit and the next to shallow foundation structure according to the embodiment of the present application.
Fig. 3 is a construction completion structure diagram of a deep foundation pit construction method next to a shallow foundation building according to an embodiment of the present application.
Description of reference numerals: 1. building an original shallow foundation; 2. a ring beam; 3. a deep pile foundation; 4. a deep foundation pit; 5. a reinforcement layer; 6. a sleeve valve tube; 7. connecting the beams; 8. an enclosure structure; 9. a top plate; 10. a middle plate; 11. a base plate; 12. a side wall; 13. and (5) planting reinforcing steel bars.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses a deep foundation pit construction method next to a shallow foundation building, and the method comprises the following steps with reference to fig. 1-3:
step 1.1: and laying detection control points for the original shallow foundation building 1, and collecting initial values, wherein the initial values are the position, the elevation and the real-time displacement parameters of the original shallow foundation building.
Step 1.2: deep pile foundation 3 construction, three sides that are close to newly-built deep basal pit 4 along former shallow basic building 1 carry out deep pile foundation 3 construction, and process flow does not: the method comprises the steps of field leveling → pile position paying-off → slurry pool excavation, slurry ditch → pile casing embedding → drilling machine in-place, hole site correction → hole forming, slurry circulation, waste slurry removal, mud residue → first hole cleaning → quality acceptance → steel reinforcement cage and steel guide pipe → second hole cleaning → underwater concrete pouring → pile forming. In the embodiment, a spiral drilling machine which does not extrude soil and has low vibration can be adopted for forming holes; the deep pile foundation 4 base cloth is established in the excavation scope of 1 time deep foundation ditch 4, and 3 intervals of deep pile foundation can be 3m, and the degree of depth is for 30m, the diameter is for 600 mm.
Step 1.3: after the deep pile foundation 3 is finished, pile top concrete is broken, the ring beam 2 of the original shallow foundation building 1 is excavated manually and steel bars are planted, the steel bars 13 are integrally connected with the ring beam 2 and the top steel bars of the deep pile foundation 3, and then formwork is erected to pour concrete to form the coupling beam 7. In this embodiment, before the concrete is poured, the new and old concrete surfaces are constructed according to the steps of chiseling → washing → wetting and painting the cement-based material, so as to ensure the close connection of the new and old concrete. Meanwhile, the distance between the transverse direction and the longitudinal direction of the steel bar planting reinforcing steel bars 13 can be 150 mm.
Step 2: implanting a grouting pipe between the deep foundation pit 4 and the original shallow foundation building 1, wherein in the embodiment, the grouting pipe can be a sleeve valve pipe 6; grouting the sleeve valve pipe 6 into soil between the deep foundation pit 4 and the original shallow foundation building 1 for reinforcement, wherein in the embodiment, the sleeve valve pipe 6 adopts a retreating grouting method for grouting. Meanwhile, in the process, the grouting slurry is determined according to geological and hydrological conditions, and cement slurry or double-fluid slurry can be selected.
And step 3: and (3) adopting a down-the-hole drilling machine, driving the deep pile foundation 3 into the foundation part of the original shallow foundation through an inclined angle at one side, then placing the sleeve valve pipe 6 into the hole, and plugging the sleeve valve pipe 6 for grouting and reinforcing the soil body at the bottom of the original shallow foundation building 1 after the subsequent foundation pit construction is finished.
And 4, step 4: and (4) constructing a deep foundation pit:
step 4.1: firstly, constructing a foundation pit enclosure structure 8, wherein the enclosure structure 8 can adopt an underground continuous wall, and in the embodiment, the thickness of the underground continuous wall is not less than 600mm, and the depth is not less than 1.5 times of the excavation depth of the deep foundation pit 4; and a reinforcing bar connector is embedded in the inner side of the envelope structure 8 and is used for being connected with a subsequent structural plate.
Step 4.2: excavating earth, namely excavating and taking earth from top to bottom by adopting a long-arm excavator and transporting the earth outwards, stopping excavating after the earth is excavated to the height of the top plate 9, paving a template after fine leveling and fine pressing, and constructing a structure of the top plate 9 (in the process, reinforcing steel bars in the top plate 9 are connected with reinforcing steel bar connectors corresponding to the building enclosure 8); in this embodiment, a reinforcing bar connector is reserved on the top plate 9 for connecting with the subsequent side wall 12.
Step 4.3: after the top plate 9 reaches the design strength, the soil body continues to be excavated downwards, the excavation is stopped after the soil body is excavated to the bottom elevation of the middle plate 10, the template is laid after the fine leveling and the fine pressing, the structure of the middle plate 10 is constructed (in the process, the reinforcing steel bars in the middle plate 10 are connected with the reinforcing steel bar connector corresponding to the enclosure structure 8), and in the embodiment, the reinforcing steel bar connector is reserved on the middle plate 10 and is used for being connected with the subsequent side wall 12.
Step 4.4: after the middle plate 10 reaches the design strength, the soil body continues to be excavated downwards, after the soil body is excavated to the elevation of the bottom plate 11, the excavation is stopped, the template is laid after the fine flattening and the fine pressing, and the structure of the bottom plate 11 is constructed (in the process, the reinforcing steel bars in the bottom plate 11 are connected with the reinforcing steel bar connector corresponding to the enclosure structure 8).
In this embodiment, in the processes of step 4.3 and step 4.4, due to the structural interference of the top plate 9, the soil below the top plate 9 is excavated from the side, and the small excavator is relayed to pour out the projection area of the structural slab and finally is moved out by the long arm excavator.
And 5: construction of the side wall 12: firstly constructing a side wall 12 between a bottom plate 11 and a middle plate 10, and then constructing a side wall 12 between the middle plate 10 and a top plate 9; in the process, the steel bars of the side wall 12 are respectively connected with the steel bar connectors on the middle plate 10 and the top plate 9, so that the side wall 12 structural plates are connected into a whole.
Step 6: in the construction process of the deep foundation pit 4, the deformation, sedimentation and cracking conditions of the structure of the original shallow foundation building 1 need to be strictly detected, and grouting reinforcement is carried out towards the bottom of the original shallow foundation building 1 through the sleeve valve pipe 6.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. The utility model provides a shallow basic building protection architecture of next-door neighbour deep basal pit engineering which characterized in that: the construction method comprises deep pile foundations (3) arranged close to an original shallow foundation building (1), wherein the upper ends of the deep pile foundations (3) are connected with connecting beams (7), and the connecting beams (7) are connected with ring beams (2) of the original shallow foundation building (1); and a grouting reinforcement layer (5) is also arranged between the deep pile foundation (3) and the newly-built deep foundation pit (4).
2. The protection structure for the shallow foundation building next to the deep foundation pit engineering according to claim 1, wherein: and bar-planting reinforcing steel bars (13) are arranged between the connecting beam (7) and the ring beam (2) of the original shallow foundation building (1), and the connecting beam (7) is formed by firstly binding the reinforcing steel bars and then pouring concrete.
3. The protection structure for the shallow foundation building next to the deep foundation pit engineering according to claim 1, wherein: the pile foundation structure is characterized by further comprising a grouting pipe obliquely arranged below the original shallow foundation building (1), wherein one end of the grouting pipe extends out of the ground on one side of the pile foundation.
4. A deep foundation pit construction method using the shallow foundation construction protection structure of any one of claims 1 to 3, characterized in that: the method comprises the following steps:
step 1, newly adding a deep pile foundation (3): the deep pile foundation (3) is arranged towards three sides of a newly-built deep foundation pit (4) along the original shallow foundation building (1), the deep pile foundation (3) is distributed in the excavation range of the deep foundation pit (4) which is not less than 1 time, and the deep pile foundation (3) is connected with a ring beam (2) of the original shallow foundation building (1);
step 2, grouting reinforcement: grouting between the deep foundation pit (4) and the deep pile foundation (3) to form a reinforcing layer (5);
step 3, excavating the deep foundation pit (4): firstly constructing a foundation pit enclosure structure (8), then performing earth excavation from top to bottom, stopping excavation after earth excavation reaches a top plate (9), and laying a template to construct a top plate (9) structure; after the top plate (9) reaches the design strength, continuously excavating the soil body downwards, and constructing a middle plate (10) and a bottom plate (11) in sequence; after the construction of the structural slab is finished, the side walls (12) between the bottom plate (11) and the middle plate (10) and between the middle plate (10) and the top plate (9) are constructed sequentially from bottom to top.
5. A method of constructing a deep foundation pit (4) next to a shallow foundation structure according to claim 4, characterized in that: in the step 1, pile top concrete is removed after the deep pile foundation (3) is constructed, ring beams (2) of the original shallow foundation building (1) are excavated and bar-planted, bar-planted bars (13) are integrally connected with the ring beams (2) and pile foundation top bars, and then formwork is erected to pour concrete, so that connecting beams (7) integrated with the ring beams (2) and the deep pile foundation (3) are formed.
6. The method for constructing a deep foundation pit adjacent to a shallow foundation structure as claimed in claim 4, wherein: and 2, before the reinforcing layer (5) is formed by grouting, embedding a grouting pipe under the original shallow foundation building (1), wherein the grouting pipe is obliquely arranged, and the opening end of the grouting pipe extends to the ground on one side of the deep pile foundation (3) and plugs the grouting pipe opening.
7. The method for constructing a deep foundation pit adjacent to a shallow foundation structure as claimed in claim 1, wherein: in the step 3, when the enclosure structure (8) is constructed, a steel bar connector connected with the top plate (9) and the middle plate (10) is reserved on the inner side of the enclosure structure (8).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110548526.3A CN113431097A (en) | 2021-05-19 | 2021-05-19 | Protection structure of shallow foundation building next to deep foundation pit engineering and construction method |
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| CN202110548526.3A CN113431097A (en) | 2021-05-19 | 2021-05-19 | Protection structure of shallow foundation building next to deep foundation pit engineering and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114108617A (en) * | 2021-11-12 | 2022-03-01 | 山西机械化建设集团有限公司 | Method for removing groove and planting bar for foundation pit supporting pile by using down-the-hole drill |
| CN114775622A (en) * | 2022-05-18 | 2022-07-22 | 中铁二十二局集团有限公司 | Construction method of special-shaped deep foundation pit with construction space limitation of adjacent building structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108617A (en) * | 2021-11-12 | 2022-03-01 | 山西机械化建设集团有限公司 | Method for removing groove and planting bar for foundation pit supporting pile by using down-the-hole drill |
| CN114775622A (en) * | 2022-05-18 | 2022-07-22 | 中铁二十二局集团有限公司 | Construction method of special-shaped deep foundation pit with construction space limitation of adjacent building structure |
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