CN218027730U - Bored pile combination foundation pit enclosure structure - Google Patents
Bored pile combination foundation pit enclosure structure Download PDFInfo
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- CN218027730U CN218027730U CN202222287026.1U CN202222287026U CN218027730U CN 218027730 U CN218027730 U CN 218027730U CN 202222287026 U CN202222287026 U CN 202222287026U CN 218027730 U CN218027730 U CN 218027730U
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Abstract
The utility model discloses a bored pile combined foundation pit support structure, which comprises a bored 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 bored pile group (1), and a reinforcing pile group (3) is arranged on the inner side of the bored pile group (1); a horizontal concrete supporting beam (4) is also arranged at the top of the bored pile group (1); the horizontal concrete supporting beam is characterized by also comprising a steel structure diagonal brace (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 utility model has the characteristics of can effectively reduce engineering cost.
Description
Technical Field
The utility model relates to a foundation ditch retaining structure, especially a bored concrete pile combination foundation ditch retaining structure.
Background
The types of the existing foundation pit support structures can be summarized into the following 6 types: the foundation pit support structure comprises a sheet pile type foundation pit support structure, a column type foundation pit support structure, an underground continuous wall foundation pit support structure, a self-standing cement-soil retaining wall foundation pit support structure, a combined type foundation pit support structure and an open caisson (box) method. 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 cofferdam has 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 Laker Mo Na 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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a bored concrete pile makes up foundation ditch retaining structure. The utility model has the characteristics of can effectively reduce engineering cost.
The technical scheme of the utility model: the bored pile combined foundation pit support structure comprises a 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 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.
In the cast-in-situ bored pile combined foundation pit support structure, 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, the reinforcing pile group is a double-shaft cement stirring pile group.
In the cast-in-situ bored pile combined foundation pit support structure, the triangular soil stacking layer is located below the steel structure diagonal brace.
In the cast-in-situ bored pile combined foundation pit support structure, the length of the steel structure diagonal brace is 6-9.4m.
Compared with the prior art, the utility model consists of a bored concrete pile group, a waterproof curtain, a reinforced pile group, a horizontal concrete supporting beam and a steel structure diagonal brace, wherein the bored concrete pile group, the waterproof curtain and the reinforced pile group are positioned on the outer edge surface of the foundation pit; and simultaneously, the utility model discloses a set up the triangle soil and stack the layer and be used for stacking triangle soil between drilling bored concrete pile group and bracket, this structure can reduce the pile bolck displacement at to a great extent under the same condition of excavation degree of depth, and ground deformation reduces greatly behind the messenger pile, avoids causing destruction to the surrounding environment, can also reduce pile body moment of flexure, and then makes the design strength reduction of pile body, and the reduction of design strength is favorable to reducing engineering cost. To sum up, the utility model has the characteristics of can effectively reduce engineering cost.
Drawings
FIG. 1 is a floor plan of a foundation pit enclosure;
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 labels in the figures 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 stacking layer.
Detailed Description
The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.
Examples are given. The bored pile combined foundation pit support structure 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, as shown in figures 1 to 6; 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 the design strength, the basement bottom plate and the bearing platform bottom are excavated layer by layer and block according to the 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 arranging a steel structure diagonal brace after the bottom plate and the bracket reach 80% of design strength, wherein the length of the steel structure diagonal brace is about 6-9.4m. After the steel structure inclined strut is arranged, triangular soil is excavated, and then a force transmission belt of the underground chamber foundation and the bottom plate beside the construction pit 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 and tamping in layers. The thickness of each layer is not more than 250 mm by manual compaction and not more than 300mm by mechanical compaction, and the waterproof layer is prevented from being damaged. The backfilled soil can not use silt, ploughed soil, frozen soil, expansive soil, domestic garbage and soil with organic matter content more than 5%. 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 (5)
1. Drilling bored concrete pile combination foundation ditch envelope, its characterized in that: the foundation pit water-stopping curtain is characterized by comprising a bored pile group (1) positioned on the outer edge surface of a foundation pit, wherein a water-stopping 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); a horizontal concrete supporting beam (4) is also arranged at the top of the bored pile group (1); the horizontal concrete supporting beam is characterized by also comprising a steel structure diagonal brace (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).
2. The cast-in-situ bored pile combined foundation pit support structure of 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 of 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 of 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 of claim 1, wherein: the length of the steel structure diagonal brace (6) is 6-9.4m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222287026.1U CN218027730U (en) | 2022-08-29 | 2022-08-29 | Bored pile combination foundation pit enclosure structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222287026.1U CN218027730U (en) | 2022-08-29 | 2022-08-29 | Bored pile combination foundation pit enclosure structure |
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| CN218027730U true CN218027730U (en) | 2022-12-13 |
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| CN202222287026.1U Active CN218027730U (en) | 2022-08-29 | 2022-08-29 | Bored pile combination foundation pit enclosure structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115233698A (en) * | 2022-08-29 | 2022-10-25 | 浙江大学建筑设计研究院有限公司 | Bored pile combined foundation pit support structure reserved with triangular soil and construction method |
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2022
- 2022-08-29 CN CN202222287026.1U patent/CN218027730U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115233698A (en) * | 2022-08-29 | 2022-10-25 | 浙江大学建筑设计研究院有限公司 | Bored pile combined foundation pit support structure reserved with triangular soil and construction method |
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