CN221193375U - Foundation pit prestressed ring frame beam supporting structure - Google Patents
Foundation pit prestressed ring frame beam supporting structure Download PDFInfo
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- CN221193375U CN221193375U CN202323299171.2U CN202323299171U CN221193375U CN 221193375 U CN221193375 U CN 221193375U CN 202323299171 U CN202323299171 U CN 202323299171U CN 221193375 U CN221193375 U CN 221193375U
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- frame beam
- foundation pit
- concrete ring
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 59
- 239000010959 steel Substances 0.000 claims abstract description 59
- 238000004873 anchoring Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 abstract description 8
- 239000002689 soil Substances 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 7
- 210000001015 abdomen Anatomy 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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Abstract
The utility model relates to a foundation pit prestress ring frame beam supporting structure, and belongs to the technical field of underground engineering foundation pit support. The support structure comprises a concrete ring frame beam, wherein the periphery of the concrete ring frame beam is fixedly connected with foundation pit support piles at the periphery in a foundation pit; the middle part of each frame of the concrete ring frame beam is fixedly connected with a widening table; at least one corrugated pipe is reserved in the widening table, and steel stranded wires Zhang Lacao and anchoring ends are respectively arranged at two ends of the widening table; each corrugated pipe passes through a bundle of prestress steel strands; one end of the prestress steel strand is connected with an anchoring end, and the other end of the prestress steel strand is arranged in a steel strand stretching groove. According to the utility model, the concrete ring frame beam is widened by adopting the widening table, the prestressed steel strands are arranged in the widening table, and the steel strands Zhang Lacao are tensioned to apply prestress, so that a certain reverse pre-loading is generated to offset part of side soil pressure load, the deformation of the supporting structure is effectively controlled, and the method is easy to popularize and apply.
Description
Technical Field
The utility model belongs to the technical field of underground engineering foundation pit support, and particularly relates to a foundation pit prestress ring frame beam supporting structure.
Background
In the existing underground deep foundation pit supporting engineering, the design that the foundation pit is used as a temporary construction channel and is used as a main body function is widely adopted in an underground space, for example, a hidden excavation station does not have a inclined shaft channel condition, a vertical shaft foundation pit is used as a temporary construction channel, a vertical shaft later stage is used as a station air channel or an access, similar foundation pit supporting construction needs larger space, and deformation control is more strict.
The traditional foundation pit inner support supporting system has contradiction and conflict between deformation and operation space, and the foundation pit with strict deformation control requires small support spacing, so that the operation space is insufficient and the construction cannot be unfolded. The prestressed ring frame beam supporting structure can solve the direct contradiction between deformation control and operation space, can control foundation pit deformation by applying prestressing force in advance, can optimize supporting arrangement and fully release operation space, and improves construction efficiency to a greater extent.
Under the conventional condition, the stress form of the ring frame beam is that the outer side and the middle inner side of the support are pulled, and the support has larger hogging moment and can be handled by adopting the modes of mutual anchoring arrangement of stress reinforcing steel bars, plate support arrangement and the like. However, excessive mid-span bending moments can only be handled by increasing the beam cross section or increasing the support, which is a relatively wasteful of engineering material and space. Therefore, how to overcome the defects of the prior art is a problem to be solved in the technical field of underground engineering foundation pit supporting paint.
Disclosure of utility model
The utility model aims to solve the defects in the prior art and provides a foundation pit prestress ring frame beam supporting structure. The concrete ring frame beam is widened in the abdomen on the support pile, prestressed steel strands are arranged at the abdomen of the concrete ring frame beam, the prestressing force is applied by adopting a post-tensioning method, and the prestressing force is applied to the tension part in the concrete ring frame beam span to generate certain reverse prestressing force so as to offset partial side soil pressure load and control foundation pit deformation.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
The foundation pit prestressed ring frame beam supporting structure is characterized by comprising a concrete ring frame beam, wherein the periphery of the concrete ring frame beam is fixedly connected with foundation pit supporting piles at the periphery in a foundation pit;
the middle part of each frame of the concrete ring frame beam is fixedly connected with a widening table;
The length of the widening table is 1/3-4/5 of the length of the fixedly connected frame, the height of the widening table is the same as the height of the fixedly connected frame, and the width of the widening table is 0.8-2 times of the width of the fixedly connected frame;
at least one corrugated pipe is reserved in the widening table, and steel stranded wires Zhang Lacao and anchoring ends are respectively arranged at two ends of the widening table; the number of the steel strand tensioning grooves and the number of the anchoring ends are the same as the number of the corrugated pipes;
Each corrugated pipe passes through a bundle of prestress steel strands; one end of the prestress steel strand is connected with an anchoring end, and the other end of the prestress steel strand is arranged in a steel strand stretching groove.
Further, preferably, each corner of the foundation pit is provided with a plate support; the top of the plate support is fixedly connected with the bottom of the concrete ring frame beam; and the height of the plate support is smaller than that of the concrete ring frame beam.
Further, it is preferable that the height of the slab support is 1/5~2/5 of the height of the concrete ring frame.
Further, it is preferable that the periphery of the concrete ring frame beam and the foundation pit supporting piles on the periphery in the foundation pit are fixedly connected by adopting mutual anchors of reinforcing steel bars.
Further, it is preferable that a plurality of stress steel bars are arranged in the concrete ring frame beam and the widening table.
The concrete ring frame beam is characterized in that the concrete ring frame beam is arranged at the inner side of the widened table, and the concrete ring frame beam is arranged at the inner side of the widened table.
The concrete ring frame beam and the widening table are of an integrated structure, so that the concrete ring frame beam is obtained through belly widening.
When the foundation pit supporting piles around the concrete ring frame beam and the foundation pit are fixedly connected by adopting the mutual anchors of the steel bars, the specific arrangement positions and the method of the mutual anchors of the steel bars are not limited, and the foundation pit supporting piles are arranged according to the conventional technical method in the field.
The utility model adopts the mode of increasing prestress to optimize the beam section and the reinforcement to a great extent, and increases the working space.
The number of the steel strand tensioning grooves and the number of the anchoring ends are the same as the number of the corrugated pipes; each corrugated pipe passes through a bundle of prestress steel strands; one end of the prestress steel strand is connected with an anchoring end, and the other end of the prestress steel strand is arranged in a steel strand stretching groove. That is, only one bundle of prestress steel strand is fixed at one anchoring end, and only one steel strand stretching groove is used for stretching one bundle of prestress steel strand. When in tensioning, a post-tensioning method can be used for applying prestress, and the prestress is applied to the tension part in the concrete ring frame beam span to generate certain reverse preload so as to offset part of side soil pressure load and effectively control the deformation of the supporting structure.
In the utility model, two adjacent widening stages can be provided with a steel strand Zhang Lacao at one end and an anchoring end at the other end, but can also be not provided, for example, a first widening stage is provided with a steel strand Zhang Lacao at one end and an anchoring end at the other end, a second widening stage is provided with an anchoring end at one end and a steel strand Zhang Lacao at the other end; the utility model is preferably arranged in a second way, which facilitates the tensioning operation, i.e. reduces the number of movements of the tensioning device.
The concrete ring frame beam is not limited to the concrete ring frame beam in specific shape, and can be provided with four frames, five frames, six frames and the like according to the prior art, and the concrete ring frame beam is not limited to the concrete ring frame beam.
Compared with the prior art, the utility model has the beneficial effects that:
The concrete ring frame beam adopts the widening table to widen the abdomen, prestressed steel strands are arranged in the widening table, and the steel strands Zhang Lacao are tensioned to apply prestress, so that a certain reverse pre-loading is generated to offset part of side soil pressure load, and the deformation of the supporting structure is effectively controlled; meanwhile, the bearing capacity is improved;
the use of the utility model can reduce the number of foundation pit supporting piles, namely, the arrangement interval of the foundation pit supporting piles is increased;
compared with the traditional foundation pit inner support supporting system, the construction space is increased, so that the construction efficiency is improved;
The utility model has novel structure, convenient use and convenient popularization.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic plan view of one embodiment of a foundation pit prestressed ring frame beam support structure of the present utility model;
FIG. 2 is a partial three-dimensional schematic view of one embodiment of a foundation pit prestressed ring frame beam support structure of the present utility model;
FIG. 3 is a schematic plan view of another embodiment of a foundation pit prestressed ring frame beam support structure of the present utility model;
Fig. 4 is a schematic diagram of a stressed rebar arrangement;
In the figure, 1, foundation pit supporting piles; 2. concrete ring frame beams; 3. prestress steel strand; 4. steel strand Zhang Lacao; 5. an anchor end; 6. a plate support; 7. a stress steel bar; 8. anchoring the steel bars mutually; 9. a bellows; 10. widening the table.
Detailed Description
The present utility model will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the present utility model and should not be construed as limiting the scope of the utility model. The specific techniques, connections, or conditions are not identified in the examples and are set forth in accordance with the techniques, connections, conditions, or in accordance with the product specifications described in the literature in this field. The materials, instruments or equipment used are conventional products available from commercial sources, not identified to the manufacturer.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more. The orientation or state relationship indicated by the terms "inner", "upper", "lower", etc. are orientation or state relationship based on the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the utility model.
In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "provided" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model is understood by those of ordinary skill in the art according to the specific circumstances.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Example 1
As shown in fig. 1 and 2, the prestressed ring frame beam supporting structure of the foundation pit comprises a concrete ring frame beam 2, wherein the periphery of the concrete ring frame beam 2 is fixedly connected with foundation pit supporting piles 1 around in the foundation pit;
The middle part of each frame of the concrete ring frame beam 2 is fixedly connected with a widening table 10;
The length of the widening table 10 is 1/3-4/5 of the length of the fixedly connected frame, the height is the same as the height of the fixedly connected frame, and the width is 0.8-2 times of the width of the fixedly connected frame;
at least one corrugated pipe 9 is reserved in the widening table 10, and steel strand tensioning grooves 4 and anchoring ends 5 are respectively arranged at two ends of the widening table 10; the number of the steel strand tensioning grooves 4 and the number of the anchoring ends 5 are the same as the number of the corrugated pipes 9;
Each corrugated pipe 9 passes through a bundle of prestress steel strands 3; one end of the prestress wire 3 is connected with an anchoring end 5, and the other end is arranged in a wire tensioning groove 4.
In this embodiment, two adjacent widening stages 10 are each provided with a steel strand pulling groove 4 at one end and an anchoring end 5 at the other end, as shown in fig. 1.
Example 2
As shown in fig. 3, the foundation pit prestressed ring frame beam supporting structure comprises a concrete ring frame beam 2, wherein the periphery of the concrete ring frame beam 2 is fixedly connected with foundation pit supporting piles 1 at the periphery in a foundation pit;
The middle part of each frame of the concrete ring frame beam 2 is fixedly connected with a widening table 10;
The length of the widening table 10 is 1/3-4/5 of the length of the fixedly connected frame, the height is the same as the height of the fixedly connected frame, and the width is 0.8-2 times of the width of the fixedly connected frame;
at least one corrugated pipe 9 is reserved in the widening table 10, and steel strand tensioning grooves 4 and anchoring ends 5 are respectively arranged at two ends of the widening table 10; the number of the steel strand tensioning grooves 4 and the number of the anchoring ends 5 are the same as the number of the corrugated pipes 9;
Each corrugated pipe 9 passes through a bundle of prestress steel strands 3; one end of the prestress wire 3 is connected with an anchoring end 5, and the other end is arranged in a wire tensioning groove 4.
Each corner of the foundation pit is provided with a plate support 6; the top of the plate support 6 is fixedly connected with the bottom of the concrete ring frame beam 2; and the height of the plate support 6 is smaller than that of the concrete ring frame beam 2.
The height of the plate support 6 is 1/5~2/5 of the height of the concrete ring frame beam 2.
In this embodiment, for two adjacent widening stages 10, the first widening stage 10 has one end provided with a strand stretching groove 4 and the other end provided with an anchoring end 5, and the second widening stage 10 has one end provided with an anchoring end 5 and the other end provided with a strand stretching groove 4, as shown in fig. 3.
The specific manufacturing implementation method of the embodiment is as follows:
1. Foundation pit excavation is below the concrete ring frame beam 2, the stressed steel bars 7 of the concrete ring frame beam 2, the plate support 6 and the widening table 10 are bound, wherein the support of the concrete ring frame beam 2 is mutually anchored with the tensioned steel bars 8, the bellows 9 is reserved in the widening table 10, a steel strand tensioning groove 4 is formed in one end of the bellows, and then the concrete ring frame beam 2, the plate support 6 and the widening table 10 are poured by a formwork. The concrete ring frame beam 2 and the widening table 10 are of an integrated structure;
2. When the concrete of the concrete ring frame beam 2 and the widening table 10 reaches 80% of the design strength, the prestress steel strand 3 is penetrated through the reserved corrugated pipe 9, the prestress is applied to the prestress steel strand 3 according to the design requirement, and after tensioning and locking, the foundation pit can be excavated downwards due to stable deformation.
3. The first point to be noted is that the corner of the foundation pit should be provided with a plate support 6 to strengthen the internal corner support, and the height of the plate support 6 is smaller than that of the concrete ring frame beam 2 so as to improve the foundation of the tensioning equipment.
4. The second point to be described is that when the concrete ring frame beam 2 and the widening table 10 are poured, the steel strand stretching grooves 4 and the anchoring ends 5 should avoid a certain space of the foundation pit supporting piles 1 so as to stretch the operable space of the equipment.
Example 3
As shown in fig. 3 and 4, the prestressed ring frame beam supporting structure of the foundation pit comprises a concrete ring frame beam 2, wherein the periphery of the concrete ring frame beam 2 is fixedly connected with foundation pit supporting piles 1 around in the foundation pit;
The middle part of each frame of the concrete ring frame beam 2 is fixedly connected with a widening table 10;
The length of the widening table 10 is 1/3-4/5 of the length of the fixedly connected frame, the height is the same as the height of the fixedly connected frame, and the width is 0.8-2 times of the width of the fixedly connected frame;
at least one corrugated pipe 9 is reserved in the widening table 10, and steel strand tensioning grooves 4 and anchoring ends 5 are respectively arranged at two ends of the widening table 10; the number of the steel strand tensioning grooves 4 and the number of the anchoring ends 5 are the same as the number of the corrugated pipes 9;
Each corrugated pipe 9 passes through a bundle of prestress steel strands 3; one end of the prestress wire 3 is connected with an anchoring end 5, and the other end is arranged in a wire tensioning groove 4.
Each corner of the foundation pit is provided with a plate support 6; the top of the plate support 6 is fixedly connected with the bottom of the concrete ring frame beam 2; and the height of the plate support 6 is smaller than that of the concrete ring frame beam 2 so as to provide a foundation for tensioning the prestressed steel strand 3.
The height of the plate support 6 is 1/5~2/5 of the height of the concrete ring frame beam 2.
The periphery of the concrete ring frame beam 2 and the foundation pit supporting piles 1 around in the foundation pit are fixedly connected by adopting steel bar mutual anchors 8.
A plurality of stress steel bars 7 are arranged in the concrete ring frame beam 2 and the widening table 10.
In this embodiment, for two adjacent widening stages 10, the first widening stage 10 has one end provided with a strand stretching groove 4 and the other end provided with an anchoring end 5, and the second widening stage 10 has one end provided with an anchoring end 5 and the other end provided with a strand stretching groove 4, as shown in fig. 3.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (5)
1. The foundation pit prestressed ring frame beam supporting structure is characterized by comprising a concrete ring frame beam (2), wherein the periphery of the concrete ring frame beam (2) is fixedly connected with foundation pit supporting piles (1) at the periphery in a foundation pit;
The middle part of each frame of the concrete ring frame beam (2) is fixedly connected with a widening table (10);
The length of the widening table (10) is 1/3-4/5 of the length of the fixedly connected frame, the height of the widening table is the same as the height of the fixedly connected frame, and the width of the widening table is 0.8-2 times of the width of the fixedly connected frame;
At least one corrugated pipe (9) is reserved in the widening table (10), and steel strands Zhang Lacao (4) and an anchoring end (5) are respectively arranged at two ends of the widening table (10); the number of the steel strands Zhang Lacao (4) and the number of the anchoring ends (5) are the same as the number of the corrugated pipes (9);
Each corrugated pipe (9) passes through a bundle of prestress steel strands (3); one end of the prestress wire (3) is connected with an anchoring end (5), and the other end is arranged in a steel strand Zhang Lacao (4).
2. The foundation pit prestress ring frame beam supporting structure according to claim 1, characterized in that each corner of the foundation pit is provided with a plate support (6); the top of the plate support (6) is fixedly connected with the bottom of the concrete ring frame beam (2); and the height of the plate support (6) is smaller than that of the concrete ring frame beam (2).
3. Foundation pit prestressed ring frame girder supporting structure according to claim 1, characterized in that the height of the slab braces (6) is 1/5~2/5 of the height of the concrete ring frame girder (2).
4. The foundation pit prestressed ring frame beam supporting structure according to claim 1, wherein the periphery of the concrete ring frame beam (2) is fixedly connected with the foundation pit supporting piles (1) at the periphery in the foundation pit by adopting steel bar mutual anchors (8).
5. The foundation pit prestressed ring frame beam supporting structure according to claim 1, wherein a plurality of stress steel bars (7) are arranged in the concrete ring frame beam (2) and the widening table (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323299171.2U CN221193375U (en) | 2023-12-05 | 2023-12-05 | Foundation pit prestressed ring frame beam supporting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323299171.2U CN221193375U (en) | 2023-12-05 | 2023-12-05 | Foundation pit prestressed ring frame beam supporting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221193375U true CN221193375U (en) | 2024-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323299171.2U Active CN221193375U (en) | 2023-12-05 | 2023-12-05 | Foundation pit prestressed ring frame beam supporting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221193375U (en) |
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2023
- 2023-12-05 CN CN202323299171.2U patent/CN221193375U/en active Active
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