CN111676982A - Cement-soil enclosure wall-precast pile cantilever type combined support - Google Patents
Cement-soil enclosure wall-precast pile cantilever type combined support Download PDFInfo
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- CN111676982A CN111676982A CN202010514736.6A CN202010514736A CN111676982A CN 111676982 A CN111676982 A CN 111676982A CN 202010514736 A CN202010514736 A CN 202010514736A CN 111676982 A CN111676982 A CN 111676982A
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- pile
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- soil
- precast
- enclosure wall
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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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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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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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
A cantilever type combined support of a cement-soil enclosure wall and a precast pile is characterized in that the precast pile is sleeved and driven in a tension area outside the cement-soil mixing pile enclosure wall, and the combined support is formed by utilizing the binding force between the cement-soil mixing pile and the precast pile; inserting steel pipes and reinforcing steel bars into the cement mixing pile enclosure wall to increase the strength of the cement mixing pile enclosure wall; the combined supporting roof is provided with a concrete crown beam and a coping plate, and the steel bar of the precast pile is anchored into the crown beam, the dowel bar of the cement mixing pile and the steel pipe are anchored into the coping plate, so that the integrity of the enclosure structure is improved; and the pit bottom is reinforced, so that the stability of the enclosure structure is improved, and the bulging deformation of the pit bottom is controlled. The invention can be used for the conditions that the construction condition of the enclosure structure is limited or a building needs to be protected outside the pit, can effectively increase the rigidity of the enclosure structure under the condition that the width of the enclosure structure is not increased, reduces the lateral displacement of the enclosure structure and the surface settlement outside the pit, reduces the influence on the surrounding environment caused by excavation of the foundation pit, reduces the construction period of the project, and has good applicability and social benefit.
Description
Technical Field
The invention relates to the field of geotechnical engineering, in particular to a cantilever type combined support of a cement soil enclosure wall-precast pile.
Background
When a building is newly constructed in an urban area, a large amount of foundation pit supporting engineering is needed, the construction conditions are often limited, and the construction conditions are mainly represented by the following three aspects: (1) the general overall arrangement in current situation urban area is regular, the space is compact, underground pipe network is complicated and complicated, and the construction space often can receive the restriction of peripheral structure (building) and pipeline, and the foundation ditch does not generally possess the slope excavation condition. (2) The normal operation of the peripheral pipelines and the structures (buildings) is ensured during the new construction, and the displacement of the peripheral structures (buildings) and underground pipelines is strictly controlled during the construction process. (3) The project close to the surrounding residential area needs to avoid long-time construction, and the construction period needs to avoid great influence on the surrounding environment. Due to the limitations of the above aspects, the design and construction of new building foundation pit supports have great challenges, and the design of foundation pit supports under soft soil geological conditions is more difficult.
Disclosure of Invention
The invention aims to provide a cantilever type combined support of a cement-soil enclosure wall and a precast pile, which is used for the condition that the construction condition of an enclosure structure is limited or a structure (building) needs to be protected outside a pit, can effectively increase the rigidity of the enclosure structure under the condition that the width of the enclosure structure is not increased, reduces the lateral displacement of the enclosure structure and the surface settlement outside the pit, reduces the influence on the surrounding environment caused by excavation of a foundation pit, reduces the construction period of engineering and overcomes the defects of the traditional support mode.
In order to achieve the above object, the measures of the invention are: a kind of cement soil enclosure wall-cantilever type combination support of precast pile, including cement soil mixing pile enclosure wall, characterized by that to put the precast pile into the tensile area outside the cement soil mixing pile enclosure wall, utilize the cohesive force between precast pile and the cement soil mixing pile to form the entirety, deform together, cooperate the atress, form the combination support; inserting steel pipes and reinforcing steel bars into the enclosure wall of the cement-soil mixing pile to increase the strength of the enclosure wall of the cement-soil mixing pile; the combined supporting roof is provided with a concrete crown beam and a coping plate, and the steel bar of the precast pile is anchored into the concrete crown beam, the dowel bar of the cement mixing pile and the steel pipe are anchored into the coping plate, so that the integrity of the enclosure structure is improved; and the pit bottom is reinforced, so that the stability of the enclosure structure is improved, and the bulging deformation of the pit bottom is controlled.
Furthermore, the precast pile is located in a tension area outside the enclosure structure and mainly bears tension, and the cement soil mainly bears pressure, so that after the combined support is formed, the stress performance of the enclosure structure can be improved, and the rigidity of the enclosure structure is increased.
Furthermore, the prefabricated square pile or the pipe pile is inserted into the outer side before the cement-soil mixing pile is completely hardened, the prefabricated square pile or the pipe pile is inserted within 30 minutes after the cement-soil mixing pile is constructed, and the prefabricated square pile or the pipe pile is inserted by means of dead weight.
Further, prefabricated square pile or tubular pile are formed by connecting a plurality of festival section, and adjacent prefabricated square pile or tubular pile attach fitting position stagger each other, and vertical stagger distance is not less than 1 m.
Furthermore, according to different requirements of peripheral environment protection, the prefabricated square pile or tubular pile can adopt the forms of one-jump insertion, two-jump insertion and the like.
Furthermore, the enclosure mode is suitable for foundation pits with the excavation depth of 3-6 m, and the insertion depth of the enclosure structure below the pit bottom is 1.0-1.5 times of the depth of the foundation pit.
Furthermore, the length of the prefabricated square pile or the pipe pile is as long as that of the cement mixing pile or longer than that of the cement mixing pile by 1-3 m.
Furthermore, the side length or the diameter of the prefabricated square pile or the pipe pile is smaller than the diameter of the cement mixing pile, the side length of the prefabricated square pile is 45-55% of the diameter of the cement mixing pile, and the diameter of the pipe pile is 50-60% of the diameter of the cement mixing pile. Preferably, for a cement mixing pile with a diameter of 700mm, a prefabricated square pile with a side length of 350mm or a pipe pile with a diameter of 400 mm can be adopted.
Furthermore, a steel pipe and a steel bar are inserted into the cement soil enclosure wall, the steel pipe is inserted 1-3 m below the bottom of the foundation pit, the length of the steel bar is 1-3 m, and the bending strength of the cement soil wall is increased.
The combined support can be used for foundation pit engineering with excavation depth of 3-6 m and is determined according to the buried depth requirement of a to-be-constructed (building).
A construction method of a cantilever type combined support of a cement-soil enclosure wall-precast pile is characterized by comprising the following steps: A. firstly, constructing a cement-soil mixing pile enclosure wall, sleeving a precast pile on the outer side before the cement-soil mixing pile is completely hardened, forming a whole by utilizing the binding force between the cement-soil mixing pile and the precast pile, jointly deforming, and cooperatively stressing to form a combined support; B. inserting steel pipes and steel bars into the cement soil enclosure wall to increase the strength of the cement soil enclosure wall; C. the combined supporting roof is provided with a concrete crown beam and a coping plate, and the steel bar of the precast pile is anchored into the concrete crown beam, the dowel bar of the cement mixing pile and the steel pipe are anchored into the coping plate, so that the integrity of the enclosure structure is improved; D. and the pit bottom is reinforced, so that the stability of the enclosure structure is improved, and the bulging deformation of the pit bottom is controlled.
The invention can be used for the conditions that the construction condition of the enclosure structure is limited or a building needs to be protected outside the pit, can effectively increase the rigidity of the enclosure structure under the condition that the width of the enclosure structure is not increased, reduces the lateral displacement of the enclosure structure and the surface settlement outside the pit, reduces the influence on the surrounding environment caused by excavation of the foundation pit, reduces the construction period of the project, and has good applicability and social benefit.
Drawings
Fig. 1 is a structural front view of the present invention.
Fig. 2 is a horizontal sectional view of fig. 1.
In the figure: 1-cement soil enclosure wall, 2-precast pile, 3-concrete pressure top plate, 4-steel pipe, 5-steel bar, 6-pit bottom reinforcement, 7-building (building) and 8-concrete crown beam.
Detailed Description
The invention provides a cement-soil enclosure wall-precast pile cantilever type combined support which is further described in detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Referring to fig. 1-2, the embodiment discloses a cement-soil enclosure wall-precast pile cantilever type combined support, which includes a cement-soil enclosure wall 1, the precast pile 2 is sleeved and driven outside the cement-soil enclosure wall 1 to form the combined support, the combined support top is provided with a concrete crown beam 8 and a top pressing plate 3 to increase the integrity of an enclosure structure, a steel pipe 4 and a steel bar 5 are inserted into the cement-soil enclosure wall to increase the strength of the cement-soil wall, a pit bottom reinforcement 6 is used for foundation pit bottom construction to increase the stability of the enclosure structure, and the whole combined support is implemented for realizing a planned construction (building) structure 7. Compared with the condition that only the coping plate is arranged, the cross section and the rigidity of the crown beam are larger, the effective anchoring length of the precast pile steel bar can be ensured, and all precast piles are connected together to be cooperatively stressed and deformed.
Optionally, the precast pile 2 is located in a tension area outside the enclosure structure and mainly bears tension, and the cement soil 1 mainly bears pressure, so that after the combined support is formed, the stress performance of the enclosure structure can be improved, and the rigidity of the enclosure structure is increased.
Optionally, a steel pipe 4 and a steel bar 5 are inserted into the cement soil enclosure wall, the steel pipe 4 is inserted 1-3 m below the bottom of the foundation pit, the steel bar 5 is 1-3 m long, and the bending strength of the cement soil wall 1 is increased.
Optionally, the combined supporting roof is provided with a concrete crown beam 8 and a coping plate 3, the precast pile 2 is anchored into the crown beam 8 through steel bars, the steel bars 5 of the cement mixing pile 1 and the steel pipes 4 are anchored into the coping plate 3, and the integrity of the enclosure structure is improved.
Optionally, the combined supporting form is a cantilever structure, an inner support does not need to be arranged during excavation, and the construction period can be effectively shortened.
Optionally, pit bottom reinforcement 6 in a certain range is constructed at the bottom of the foundation pit, so that the stability of the building enclosure is improved, and the bulging deformation of the pit bottom is controlled.
In conclusion, the invention provides the cement-soil enclosure wall-precast pile cantilever type combined support, which can be used for the conditions that the construction condition of an enclosure structure is limited or a structure (building) needs to be protected outside a pit, can effectively increase the rigidity of the enclosure structure under the condition that the width of the enclosure structure is not increased, reduces the lateral displacement of the enclosure structure and the surface settlement outside the pit, reduces the influence on the surrounding environment caused by excavation of the pit, reduces the construction period of engineering, and has good applicability and social benefit.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (7)
1. A kind of cement soil enclosure wall-cantilever type combined support of precast pile, including cement soil mixing pile enclosure wall, characterized by that to put the precast pile into the tensile area outside the cement soil mixing pile enclosure wall, utilize the cohesive force between precast pile and the cement soil mixing pile to form the combined support; inserting steel pipes and reinforcing steel bars into the enclosure wall of the cement-soil mixing pile to increase the strength of the enclosure wall of the cement-soil mixing pile; the combined supporting roof is provided with a concrete crown beam and a coping plate, and the steel bar of the precast pile is anchored into the concrete crown beam, the dowel bar of the cement mixing pile and the steel pipe are anchored into the coping plate, so that the integrity of the enclosure structure is improved; and the pit bottom is reinforced, so that the stability of the enclosure structure is improved, and the bulging deformation of the pit bottom is controlled.
2. The cement-soil enclosure wall-precast pile cantilever type combined support as claimed in claim 1, wherein the cement-soil enclosure wall-precast pile cantilever type combined support is suitable for a foundation pit with a foundation pit excavation depth of 3-6 m, and the insertion depth of an enclosure structure below the pit bottom is 1.0-1.5 times of the foundation pit depth.
3. The cantilever type combined support of cement-soil enclosure wall-precast pile as claimed in claim 1, wherein the precast square pile or pipe pile is inserted into the outer side before the cement-soil mixing pile is completely hardened, the insertion of the precast square pile or pipe pile is completed within 30 minutes after the construction of the cement-soil mixing pile, and the precast square pile or pipe pile is inserted by its own weight.
4. The cantilever type combined support of the cement-soil enclosure wall and the precast pile as claimed in claim 3, wherein the length of the precast square pile or the pipe pile is the same as or 1 to 3m longer than that of the cement-soil mixing pile.
5. The cement-soil enclosure wall-precast pile cantilever type combined support of claim 3, wherein the side length or diameter of the precast square pile or the pipe pile is smaller than the diameter of the cement mixing pile, the side length of the precast square pile is 45-55% of the diameter of the cement mixing pile, and the diameter of the pipe pile is 50-60% of the diameter of the cement mixing pile.
6. The cement-soil enclosure wall-precast pile cantilever type combined support as claimed in claim 1, wherein a steel pipe and a steel bar are inserted into the cement-soil enclosure wall, the steel pipe is inserted 1-3 m below the bottom of the foundation pit, the steel bar is 1-3 m long, and the strength of the cement-soil wall is increased.
7. The construction method of the cantilever type combination support of the cement-soil enclosure wall-precast pile as claimed in claim 1, wherein the construction method comprises the following steps: A. firstly, constructing a cement-soil mixing pile enclosure wall, sleeving a precast pile on the outer side before the cement-soil mixing pile is completely hardened, forming a whole by utilizing the binding force between the cement-soil mixing pile and the precast pile, jointly deforming, and cooperatively stressing to form a combined support; B. inserting steel pipes and steel bars into the cement soil enclosure wall to increase the strength of the cement soil enclosure wall; C. the combined supporting roof is provided with a concrete crown beam and a coping plate, and the steel bar of the precast pile is anchored into the crown beam, the dowel bar of the cement mixing pile and the steel pipe are anchored into the coping plate, so that the integrity of the enclosure structure is improved; D. and the pit bottom is reinforced, so that the stability of the enclosure structure is improved, and the bulging deformation of the pit bottom is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010514736.6A CN111676982A (en) | 2020-06-08 | 2020-06-08 | Cement-soil enclosure wall-precast pile cantilever type combined support |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010514736.6A CN111676982A (en) | 2020-06-08 | 2020-06-08 | Cement-soil enclosure wall-precast pile cantilever type combined support |
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| CN111676982A true CN111676982A (en) | 2020-09-18 |
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| CN202010514736.6A Pending CN111676982A (en) | 2020-06-08 | 2020-06-08 | Cement-soil enclosure wall-precast pile cantilever type combined support |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112854204A (en) * | 2021-01-07 | 2021-05-28 | 中铁十九局集团第三工程有限公司 | Construction method for overhead bridge drilling pile in tunnel dock type structure range |
| CN113389206A (en) * | 2021-07-05 | 2021-09-14 | 中国建筑第八工程局有限公司 | Foundation pit enclosure system and construction method thereof |
| CN113756315A (en) * | 2021-08-25 | 2021-12-07 | 杭州市市政工程集团有限公司 | Construction method of foundation pit supporting structure spanning important building structures below |
-
2020
- 2020-06-08 CN CN202010514736.6A patent/CN111676982A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112854204A (en) * | 2021-01-07 | 2021-05-28 | 中铁十九局集团第三工程有限公司 | Construction method for overhead bridge drilling pile in tunnel dock type structure range |
| CN113389206A (en) * | 2021-07-05 | 2021-09-14 | 中国建筑第八工程局有限公司 | Foundation pit enclosure system and construction method thereof |
| CN113756315A (en) * | 2021-08-25 | 2021-12-07 | 杭州市市政工程集团有限公司 | Construction method of foundation pit supporting structure spanning important building structures below |
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