CN221372167U - Pile foundation underpinning structure - Google Patents
Pile foundation underpinning structure Download PDFInfo
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- CN221372167U CN221372167U CN202322488146.2U CN202322488146U CN221372167U CN 221372167 U CN221372167 U CN 221372167U CN 202322488146 U CN202322488146 U CN 202322488146U CN 221372167 U CN221372167 U CN 221372167U
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- underpinning
- supporting
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- bearing platform
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- 238000009424 underpinning Methods 0.000 title claims abstract description 93
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 239000004567 concrete Substances 0.000 claims description 15
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007943 implant Substances 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of pile foundation underpinning, and discloses a pile foundation underpinning structure, which is arranged under an existing pier, an existing bearing platform is arranged under the pier, an underpinned pile is arranged under the bearing platform, the underpinning structure comprises an underpinning beam and underpinning piles, the existing bearing platform is wrapped by the underpinning beam, two sides of the underpinning beam are supported by the underpinning piles, a pre-jacking bearing platform is arranged at the top of the underpinning pile, a connecting section is arranged between the underpinning beam and the pre-jacking bearing platform on each underpinning pile, and a supporting device is arranged at the connecting section. The utility model solves the technical problems that the underpinned pile foundation of the existing pile foundation underpinning structure is easy to subside, the durability of the original planted bar structure between the underpinning beam and the existing bearing platform is poor, the subsidence deformation is controlled within a smaller range, and the construction quality and the durability of the underpinning structure are enhanced.
Description
Technical Field
The utility model relates to the technical field of pile foundation underpinning, in particular to a pile foundation underpinning structure.
Background
The pile foundation underpinning technology is generally used for the reconstruction of an underground foundation of a building, is a mode for carrying out foundation treatment and reinforcement, and mainly solves the problems that the foundation of an existing building is reinforced, the underground engineering needs to be built under the foundation of the existing building, the new building engineering needs to be processed when the existing building is influenced to be safe, and the like.
Disclosure of utility model
The utility model aims to provide a pile foundation underpinning structure for solving the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
The pile foundation underpinning structure is arranged under an existing pier, an existing bearing platform is arranged under the pier, an underpinned pile is arranged under the existing bearing platform, the underpinning structure comprises underpinning beams and underpinning piles, the existing bearing platform is wrapped by the underpinning beams, two sides of each underpinning beam are supported by the underpinning piles, a pre-jacking bearing platform is arranged at the top of each underpinning pile, a connecting section is arranged between each underpinning beam and the pre-jacking bearing platform on each underpinning pile, and a supporting device is arranged on each connecting section; the supporting device comprises a plurality of jacks and a plurality of supporting and adjusting devices, wherein the supporting and adjusting devices and the jacks are sequentially and circumferentially distributed along the underpinning pile center from inside to outside, and the supporting and adjusting devices are formed by a plurality of steel tube concrete columns in a surrounding and close arrangement mode.
Further, prop up the top device and include 3 jacks and 3 support adjusting device, every support adjusting device carries out the delta arrangement by 3 steel core concrete columns and forms, and the upper and lower end of the reinforced concrete column group that the delta was arranged is equipped with the clamp plate.
Specifically, the jack is equipped with steel sheet cushion with the underpinning roof beam contact surface.
Further, before underpinning, the supporting device of the connecting section is provided with a 500mm jacking space; and pouring concrete for sealing after underpinning.
Further, a plurality of tooth grooves 8 are formed on the outer surface of the existing bearing platform 4, which is in contact with the underpinning beam 2.
Specifically, holes are drilled in the tooth grooves, the diameter of each hole is d, and the distance between the two holes is more than or equal to 5d.
Specifically, the embedded bars are anchored in the holes, and hooks are arranged at the exposed parts of the embedded bars.
Further, the planting bars are anchored to the steel bars of the underpinning beam through hooks, and the planting bars in each row are arranged in a quincuncial shape.
Further, a plurality of tooth grooves are formed in the outer surface of the existing bearing platform, which is in contact with the underpinning beam.
Specifically, holes are drilled in the tooth grooves, and the diameter d and the distance between the holes are more than or equal to 5d.
Specifically, the embedded bars are anchored in the holes, and hooks are added to the exposed parts of the embedded bars.
Further, the bar planting steel bars are anchored to the steel bars of the underpinning beam through hooks, and the bar planting bars in each row are arranged in a quincuncial shape.
Compared with the prior art, the utility model has the beneficial effects that: the pile foundation underpinning structure solves the technical problem that the existing pile foundation underpinning structure is easy to settle, the original steel bar planting structure between the underpinning beam and the existing bearing platform is poor in durability, settlement deformation is controlled within a small range, and construction quality and durability of the underpinning structure are improved.
Drawings
FIG. 1 is a schematic diagram of a pile foundation underpinning structure of the present utility model;
FIG. 2 is a schematic diagram of the arrangement of the roof supporting device during underpinning of pile foundation according to the present utility model;
FIG. 3 is a view showing the interface processing construction of the underpinning beam and the existing bridge pier according to the present utility model;
FIG. 4 is a front elevation view of the connection of the existing platform and the joist of the present utility model;
In the figure: 1-pier, 2-underpinning beam, 3-existing bearing platform, 4-underpinning pile, 40-pre-jacking bearing platform, 5-underpinned pile, 6-connecting section, 7-bar planting, 8-jack, 81-steel plate cushion block, 9-supporting and adjusting device, 90-steel pipe concrete column, 91-pressing plate, 10-tooth socket and 11-hole.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1-4, an embodiment of the present utility model, a pile foundation underpinning structure, is provided under an existing pier, an existing bearing platform is provided under the pier, an underpinned pile is provided under the bearing platform, the underpinning structure includes an underpinning beam and underpinning piles, the underpinning beam wraps the existing bearing platform, two sides of the underpinning beam are supported by the underpinning piles, a pre-jacking bearing platform is provided at the top of the underpinning pile, a connection section is provided between the underpinning beam and the pre-jacking bearing platform on each underpinning pile, and a supporting device is arranged at the connection section; the supporting device comprises a plurality of jacks and a plurality of supporting and adjusting devices, wherein the supporting and adjusting devices and the jacks are sequentially and circumferentially distributed along the underpinning pile center from inside to outside, and the supporting and adjusting devices are formed by a plurality of steel tube concrete columns in a surrounding and close arrangement mode. The underpinning beam adopts a common reinforced concrete structure, C40 concrete, the bottom die of the underpinning beam adopts a cushion soil die, and the cushion concrete adopts C20 concrete with the thickness of 10cm.
In another implementation manner of this embodiment, the supporting device includes 3 jacks and 3 supporting and adjusting devices, each supporting and adjusting device is formed by arranging 3 steel tube concrete columns in a delta shape, and pressing plates are arranged at the upper end and the lower end of the delta-shaped arranged steel tube concrete column group.
The jack is equipped with the steel sheet cushion with the underpinning roof beam contact surface, the steel sheet cushion has increased the area of contact between the two, has reduced pressure to have the cushioning effect.
Before underpinning, the supporting device of the connecting section has a 500mm jacking space; and after underpinning, concrete is poured for sealing, so that the underpinning beam and the underpinning pile are firmly and safely connected.
Further, the outer surface of the existing bearing platform contacted with the underpinning beam is provided with a plurality of tooth grooves, the depth is 20mm, the groove width is 200mm, the interval is 200mm, the design of the tooth grooves increases the contact area, and the friction force is increased.
Specifically, holes are drilled in the tooth grooves, the diameter of each hole is d, and the distance between the two holes is more than or equal to 5d.
Specifically, implant muscle is anchored in the downthehole, implant muscle exposes the part and is equipped with the crotch, sets up at the crotch and conveniently has cushion cap and underpinning the roof beam and anchor.
Further, the embedded bars are anchored to the steel bars of the underpinning beam through hooks, and the embedded bars in each row are arranged in a quincuncial shape, so that the joint of the embedded bars and the steel bars of the underpinning beam is uniformly stressed and has high stability.
Preferably, the contact parts of the original piles and the bearing platforms and the underpinning beams are planted with bars by adopting a chemical bar planting method, the planted bars are HRB400phi 20 steel bars, the planted bars are anchored into concrete for 320mm, and hooks are added on the exposed parts. The spacing between the bar planting holes on the side surface of the original bearing platform is 420 multiplied by 300mm, the drilling diameter is 25mm, and the hole depth is 320mm. And (5) placing high-performance chemical bar planting glue, and hammering the implanted steel bars. Drilling holes at two positions corresponding to two sides of the foundation at different heights, wherein the height difference is not less than 10cm.
The structure of the utility model can realize the dynamic adjustment and control of the load and deformation of the upper part of the original building through the supporting device, apply the load to the newly built piles and the underpinning system, eliminate the long-term denaturation effect of part of the original building structure, and control the sedimentation deformation within a smaller range; the steel bars are anchored to the steel bars of the underpinning beam through hooks, and the structure of quincuncial arrangement among the rows of steel bars enhances the construction quality and durability of the underpinning structure.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. Pile foundation underpinning structure establishes under existing pier (1), existing cushion cap (3) have under pier (1), existing cushion cap (3) have by underpinning stake (5), its characterized in that: the underpinning structure comprises underpinning beams (2) and underpinning piles (4), the existing bearing platforms (3) are wrapped in the underpinning beams (2), two sides of each underpinning beam (2) are supported by the underpinning piles (4), a pre-jacking bearing platform (40) is arranged at the top of each underpinning pile (4), a connecting section (6) is arranged between each underpinning beam (2) and the pre-jacking bearing platform (40) on each underpinning pile, and supporting devices are arranged on the connecting sections (6); the supporting device comprises a plurality of jacks (80) and a plurality of supporting and adjusting devices (9), wherein the supporting and adjusting devices (9) and the jacks (80) are sequentially and circumferentially distributed along the underpinning pile core from inside to outside, and the supporting and adjusting devices (9) are formed by a plurality of steel pipe concrete columns which are circumferentially and closely arranged; the supporting device comprises 3 jacks (80) and 3 supporting and adjusting devices (9), each supporting and adjusting device (9) is formed by arranging 3 steel tube concrete columns (90) in a delta shape, and pressing plates (91) are arranged at the upper end and the lower end of the delta-shaped arranged reinforced concrete column groups; a steel plate cushion block (81) is arranged on the contact surface of the jack (80) and the underpinning beam (2); before underpinning, the supporting device of the connecting section (6) is provided with a 500mm jacking space; pouring concrete for sealing after underpinning; the outer surface of the existing bearing platform (3) contacted with the underpinning beam (2) is provided with a plurality of tooth grooves (10).
2. Pile foundation underpinning structure according to claim 1, characterized in that: holes (11) are drilled in the tooth grooves (10), the diameter of each hole (11) is d, and the distance between the two holes is more than or equal to 5d.
3. Pile foundation underpinning structure according to claim 2, characterized in that: the embedded bar (7) is anchored in the hole (11), and a hook is arranged at the exposed part of the embedded bar (7).
4. A pile foundation underpinning structure as claimed in claim 3, characterized in that: the planting bars (7) are anchored to the steel bars of the underpinning beam (2) through hooks, and the planting bars (7) in each row are arranged in a quincuncial shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322488146.2U CN221372167U (en) | 2023-09-13 | 2023-09-13 | Pile foundation underpinning structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322488146.2U CN221372167U (en) | 2023-09-13 | 2023-09-13 | Pile foundation underpinning structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221372167U true CN221372167U (en) | 2024-07-19 |
Family
ID=91864065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322488146.2U Active CN221372167U (en) | 2023-09-13 | 2023-09-13 | Pile foundation underpinning structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221372167U (en) |
-
2023
- 2023-09-13 CN CN202322488146.2U patent/CN221372167U/en active Active
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