CN115233698A - Bored pile combined foundation pit support structure reserved with triangular soil and construction method - Google Patents
Bored pile combined foundation pit support structure reserved with triangular soil and construction method Download PDFInfo
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- CN115233698A CN115233698A CN202211040289.0A CN202211040289A CN115233698A CN 115233698 A CN115233698 A CN 115233698A CN 202211040289 A CN202211040289 A CN 202211040289A CN 115233698 A CN115233698 A CN 115233698A
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- 239000002689 soil Substances 0.000 title claims abstract description 42
- 238000010276 construction Methods 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 8
- 230000009191 jumping Effects 0.000 claims abstract description 4
- 238000011065 in-situ storage Methods 0.000 claims description 17
- 239000004568 cement Substances 0.000 claims description 12
- 230000010485 coping Effects 0.000 claims description 12
- 238000005553 drilling Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 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
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
-
- 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)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Foundations (AREA)
Abstract
The invention discloses a bored pile combined foundation pit support structure for reserving triangular soil and a construction method, wherein the structure comprises a bored pile group positioned on the outer edge surface of a foundation pit, a waterproof curtain is arranged on the outer side of the bored pile group, and a reinforcing pile group is arranged on the inner side of the bored pile group; a horizontal concrete supporting beam is also arranged at the top of the bored pile group; the steel structure inclined strut is positioned between the horizontal concrete supporting beam and the foundation pit bracket; and a triangular soil stacking layer is also arranged between the bored pile group and the foundation pit bracket. The construction method comprises the steps of firstly constructing the pile foundation, then constructing the horizontal concrete support beam, reserving triangular soil in the area between the bored pile group and the foundation pit bracket when the capping beam and the bracket reach 80% of the design strength, jumping and digging in a subarea manner, pouring a cushion layer in time, and then constructing a middle bottom plate, a bearing platform and the bracket of the pit; and after the middle bottom plate and the corbel in the pit reach 80% of design strength, arranging a steel structure inclined strut. The invention has the characteristic of effectively reducing the construction cost.
Description
Technical Field
The invention relates to a foundation pit enclosure structure, in particular to a bored pile combined foundation pit enclosure structure with reserved triangular soil and a construction method.
Background
The types of the existing foundation pit support structures can be summarized into the following 6 types: the foundation pit support structures are of plate pile type, column type, underground continuous wall type, self-supporting cement retaining wall type, combined type and open caisson (box) method, have some limitations, and are suitable for different geological environments. The steel sheet pile cofferdam is the most common type of sheet pile cofferdam, and the steel sheet pile is a type of section steel with a locking notch, and the section of the steel sheet pile is in a straight plate shape, a groove shape, a Z shape and the like, has various sizes and interlocking forms, and is commonly in a Laerson type, a Rackvenna type and the like. The cast-in-place pile system is a pile formed by forming pile holes in foundation soil through mechanical drilling, steel pipe soil extrusion or manual excavation and the like on an engineering site, placing a reinforcement cage and cast-in-place concrete in the pile holes, and according to different hole forming methods, the cast-in-place pile can be divided into a immersed tube cast-in-place pile, a cast-in-place pile and the like, and the cast-in-place pile is a pile type defined according to the classification of the pile forming method. The combined type is the combination of a cast-in-place pile and a stirring pile, and the combined type enclosure structure has the advantages of being suitable for environments with high requirements on the surrounding environment, less pile top displacement, river water around a foundation pit and the like, but has the defect of high engineering cost. Therefore, the existing combined type enclosure structure has the problem of high manufacturing cost.
Disclosure of Invention
The invention aims to provide a cast-in-situ bored pile combined foundation pit support structure with reserved triangular soil and a construction method. The invention has the characteristic of effectively reducing the construction cost.
The technical scheme of the invention is as follows: the cast-in-situ bored pile combined foundation pit support structure with reserved triangular soil comprises a cast-in-situ bored pile group positioned on the outer edge surface of a foundation pit, wherein a waterproof curtain is arranged on the outer side of the cast-in-situ bored pile group, and a reinforcing pile group is arranged on the inner side of the cast-in-situ bored pile group; a horizontal concrete supporting beam is also arranged at the top of the bored pile group; the steel structure diagonal brace is positioned between the horizontal concrete support beam and the foundation pit bracket; and a triangular soil stacking layer is also arranged between the drilling cast-in-place pile group and the foundation pit bracket.
In the cast-in-situ bored pile combined foundation pit support structure reserved with the triangular soil, the waterproof curtain is a triaxial cement mixing pile group and/or a biaxial cement mixing pile group.
In the cast-in-situ bored pile combined foundation pit support structure reserved with the triangular soil, the reinforcing pile group is a double-shaft cement stirring pile group.
In the cast-in-situ bored pile combined foundation pit support structure reserved with the triangular soil, the triangular soil stacking layer is positioned below the steel structure inclined strut.
In the cast-in-situ bored pile combined foundation pit support structure with the reserved triangular soil, the length of the steel structure diagonal brace is 6-9.4m.
The construction method of the cast-in-situ bored pile combined foundation pit support structure with reserved triangular soil comprises the following steps of:
1) Generally surveying a site, removing obstacles, dredging and backfilling the current site, trimming to a designed surface elevation, constructing a waterproof curtain, constructing cast-in-situ bored piles, and constructing a reinforced pile group to complete pile foundation construction;
2) Construction of horizontal concrete support beams: after the pile foundation construction is finished, excavating to the bottom of a coping beam for constructing a coping beam and a horizontal concrete supporting beam;
3) Construction of the steel structure diagonal bracing: after the construction of the pile foundation is finished, excavating to the bottom of a coping beam, constructing the coping beam and a bracket, reserving triangular soil in an area between a bored cast-in-place pile group and a foundation pit bracket according to design requirements after the coping beam and the bracket reach 80% of design strength, jumping and excavating in a subarea manner and pouring a cushion layer in time, and then constructing a middle bottom plate, a cushion cap and the bracket of the pit; and after the middle bottom plate and the corbel in the pit reach 80% of design strength, arranging a steel structure inclined strut.
Compared with the prior art, the invention consists of a bored concrete pile group positioned on the outer edge surface of the foundation pit, a waterproof curtain, a reinforced pile group, a horizontal concrete supporting beam positioned at the top of the bored concrete pile group and a steel structure diagonal brace positioned between the horizontal concrete supporting beam and a bracket of the foundation pit, so that the integral strength and firmness of the enclosure structure can be effectively improved on one hand, and a good waterproof effect is also realized on the other hand; meanwhile, the triangular soil stacking layer is arranged between the bored pile group and the bracket and used for stacking triangular soil, so that pile top displacement can be reduced to a great extent under the condition of the same excavation depth, the ground deformation behind the pile is greatly reduced, the damage to the surrounding environment is avoided, the bending moment of the pile body can be reduced, the design strength of the pile body is reduced, and the reduction of the design strength is beneficial to the reduction of the engineering cost. In conclusion, the invention has the characteristic of effectively reducing the construction cost.
Drawings
Fig. 1 is a floor plan of a foundation pit support structure;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a floor plan of the pit support;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is a schematic plan view of a mound of deltoid;
fig. 6 is a partially enlarged view of fig. 5.
The symbols in the drawings are: 1-bored cast-in-place pile group, 2-waterproof curtain, 3-reinforced pile group, 4-horizontal concrete supporting beam, 5-foundation pit bracket, 6-steel structure diagonal brace and 7-triangular soil piling layer.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Examples are given. A bored pile combined foundation pit support structure reserved with triangular soil is formed as shown in figures 1 to 6 and comprises a bored pile group 1 positioned on the outer edge surface of a foundation pit, a waterproof curtain 2 is arranged on the outer side of the bored pile group 1, and a reinforcing pile group 3 is arranged on the inner side of the bored pile group 1; the top of the bored pile group 1 is also provided with a horizontal concrete support beam 4; the horizontal concrete supporting beam is characterized by further comprising a steel structure inclined strut 6 positioned between the horizontal concrete supporting beam 4 and the foundation pit corbel 5; and a triangular soil stacking layer 7 is also arranged between the drilling cast-in-place pile group 1 and the foundation pit bracket 5.
The waterproof curtain 2 is a triaxial cement mixing pile group and/or a biaxial cement mixing pile group.
The reinforcing pile group 3 is a double-shaft cement stirring pile group.
The triangular soil stacking layer 7 is positioned below the steel structure inclined strut 6.
The length of the steel structure diagonal brace 6 is 6-9.4m.
The construction process of the foundation pit support structure comprises the following steps:
1) The method comprises the steps of generally surveying a site, removing obstacles, dredging and backfilling a current pond, trimming to a designed ground surface elevation, constructing engineering piles and fender piles (firstly constructing waterproof curtains (triaxial cement mixing piles and biaxial cement mixing piles), then constructing cast-in-situ bored piles, and finally constructing a reinforcing pile group.
2) Horizontal support locations (i.e. horizontal concrete support beams): after the construction of the pile foundation is finished, the pile foundation is excavated to the bottom of the top beam for construction of the top beam and the horizontal concrete supporting beam, and the steel bar stressometers are embedded. After the capping beam and the horizontal concrete supporting beam reach 80% of design strength, the basement bottom plate and the bearing platform bottom are excavated in layers and blocks according to design requirements, and then the basement foundation and the bottom plate force transmission belt are constructed.
3) Diagonal bracing portion (steel structural diagonal bracing): and after the pile foundation construction is finished, excavating to the bottom of the coping beam for construction of the coping beam and the bracket. And after the capping beam and the bracket reach 80% of design strength, reserving triangular soil in an area between the bored pile group and the bracket of the foundation pit according to design requirements, jumping and digging in a subarea manner, pouring a cushion layer in time, and then constructing a middle bottom plate, a bearing platform and the bracket of the pit. And after the bottom plate and the bracket reach 80% of design strength, arranging a steel structure inclined strut, wherein the length of the steel structure inclined strut is about 6-9.4m. After the steel structure inclined strut is arranged, triangular soil is excavated, and then a force transmission belt of a foundation and a bottom plate of the pit edge underground chamber is constructed.
And after the construction of the foundation pit support structure is finished, continuously constructing the basement outer wall and the basement top plate. And after the outer wall and the top plate of the basement reach 80% of design strength, backfilling plain soil is tamped in layers. The thickness of each layer is manually tamped to be not more than 250 mm, and the thickness of each layer is mechanically tamped to be not more than 300mm, and the waterproof layer is prevented from being damaged. The backfill soil can not use silt, ploughed soil, frozen soil, expansive soil, domestic garbage and soil with the organic matter content of more than 5 percent. The backfill soil compaction coefficient requirement is as follows: the range from the floor cushion layer to the bottom surface of the foundation is not less than 0.94, and the rest parts are not less than 0.92; and finishing the construction of the foundation pit.
Claims (6)
1. Reserve drilling bored concrete pile combination foundation ditch envelope of triangle soil, its characterized in that: the construction method comprises a drilling cast-in-place pile group (1) positioned on the outer edge surface of a foundation pit, wherein a waterproof curtain (2) is arranged on the outer side of the drilling cast-in-place pile group (1), and a reinforcing pile group (3) is arranged on the inner side of the drilling cast-in-place pile group (1); a horizontal concrete supporting beam (4) is also arranged at the top of the bored pile group (1); the steel structure inclined strut (6) is positioned between the horizontal concrete support beam (4) and the foundation pit bracket (5); and a triangular soil stacking layer (7) is also arranged between the drilling cast-in-place pile group (1) and the foundation pit bracket (5).
2. The cast-in-situ bored pile combined foundation pit support structure provided with the triangular soil as claimed in claim 1, wherein: the waterproof curtain (2) is a triaxial cement mixing pile group and/or a biaxial cement mixing pile group.
3. The cast-in-situ bored pile combined foundation pit support structure provided with the triangular soil as claimed in claim 1, wherein: the reinforcing pile group (3) is a double-shaft cement stirring pile group.
4. The cast-in-situ bored pile combined foundation pit support structure provided with the triangular soil as claimed in claim 1, wherein: the triangular soil stacking layer (7) is positioned below the steel structure inclined strut (6).
5. The cast-in-situ bored pile combined foundation pit support structure provided with the triangular soil as claimed in claim 1, wherein: the length of the steel structure diagonal brace (6) is 6-9.4m.
6. The construction method for the foundation pit enclosure structure by using the bored pile with the reserved triangular soil as set forth in any one of claims 1 to 5, characterized by comprising the steps of:
1) Generally surveying a site, removing obstacles, dredging and backfilling the current site, trimming to a designed surface elevation, constructing a waterproof curtain, constructing cast-in-situ bored piles, and constructing a reinforced pile group to complete pile foundation construction;
2) Construction of horizontal concrete support beams: after the pile foundation construction is finished, excavating to the bottom of a coping beam for constructing a coping beam and a horizontal concrete supporting beam;
3) And (3) construction of the steel structure inclined strut: after the construction of the pile foundation is finished, excavating to the bottom of a coping beam, constructing the coping beam and a bracket, reserving triangular soil in an area between a bored cast-in-place pile group and a foundation pit bracket according to design requirements after the coping beam and the bracket reach 80% of design strength, jumping and excavating in a subarea manner and pouring a cushion layer in time, and then constructing a middle bottom plate, a cushion cap and the bracket of the pit; and after the middle bottom plate and the bracket in the pit reach 80% of design strength, arranging a steel structure inclined strut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211040289.0A CN115233698A (en) | 2022-08-29 | 2022-08-29 | Bored pile combined foundation pit support structure reserved with triangular soil and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211040289.0A CN115233698A (en) | 2022-08-29 | 2022-08-29 | Bored pile combined foundation pit support structure reserved with triangular soil and construction method |
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| CN115233698A true CN115233698A (en) | 2022-10-25 |
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| CN202211040289.0A Pending CN115233698A (en) | 2022-08-29 | 2022-08-29 | Bored pile combined foundation pit support structure reserved with triangular soil and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118223492A (en) * | 2024-05-17 | 2024-06-21 | 中航建设集团有限公司 | Building construction method for simultaneously treating waste residue pile after ground method mining during construction |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204551485U (en) * | 2015-02-11 | 2015-08-12 | 浙江中成建工集团有限公司 | Semi-inverse method throws support formula foundation ditch combined enclosure structure |
| CN218027730U (en) * | 2022-08-29 | 2022-12-13 | 浙江大学建筑设计研究院有限公司 | Bored pile combination foundation pit enclosure structure |
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- 2022-08-29 CN CN202211040289.0A patent/CN115233698A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204551485U (en) * | 2015-02-11 | 2015-08-12 | 浙江中成建工集团有限公司 | Semi-inverse method throws support formula foundation ditch combined enclosure structure |
| CN218027730U (en) * | 2022-08-29 | 2022-12-13 | 浙江大学建筑设计研究院有限公司 | Bored pile combination foundation pit enclosure structure |
Non-Patent Citations (1)
| Title |
|---|
| 岑仰润等: "滨江•金色蓝庭地下室基坑支护工程实例", 工程勘察 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118223492A (en) * | 2024-05-17 | 2024-06-21 | 中航建设集团有限公司 | Building construction method for simultaneously treating waste residue pile after ground method mining during construction |
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Application publication date: 20221025 |