CN216839463U - Combined support of welt local deep foundation pit in foundation pit - Google Patents
Combined support of welt local deep foundation pit in foundation pit Download PDFInfo
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- CN216839463U CN216839463U CN202122680808.7U CN202122680808U CN216839463U CN 216839463 U CN216839463 U CN 216839463U CN 202122680808 U CN202122680808 U CN 202122680808U CN 216839463 U CN216839463 U CN 216839463U
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Abstract
The utility model discloses a combined support of a welt local deep foundation pit in a foundation pit, which comprises the following components: the enclosure structure comprises a circle of foundation pit enclosure piles arranged along the outer edge of the foundation pit and cast-in-situ piles arranged along the outer edge of the welt local deep foundation pit, wherein two sides of each cast-in-situ pile are respectively connected to the inner sides of the foundation pit enclosure piles, and the cast-in-situ piles and the foundation pit enclosure piles form a closed space in an enclosure manner; the inner support structure comprises an inclined cast support and a horizontal support, the inclined cast support stretches across the upper part of the welt local deep foundation pit, the horizontal support is arranged in the welt local deep foundation pit, the upper end of the inclined cast support is connected to the inner side of the foundation pit fender post, the lower end of the inclined cast support is connected to a foundation pit bottom plate, and the horizontal support is connected between the inner side of the foundation pit fender post and the inner side of the cast-in-situ bored pile; the first reinforcing pile is attached to the inner side of the foundation pit fender post; and the second reinforcing pile is abutted against the outer side of the cast-in-situ bored pile. The utility model solves the problems of long construction and high construction cost of the welt local deep foundation pit in the foundation pit by adopting a conventional supporting structure.
Description
Technical Field
The utility model relates to the technical field of building construction, in particular to a combined support of a welt local deep foundation pit in a foundation pit.
Background
In the construction process of some underground structures, welt local pits are excavated in deep foundation pits, and the excavation depth of the welt local pits is up to tens of meters. For the deep foundation pit with the local deep pit excavated at the welt, the construction period of the conventional supporting structure is long, and the manufacturing cost is high.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, a combined support of the welt local deep foundation pit in the foundation pit is provided so as to solve the problems of long construction and high construction cost of the welt local deep foundation pit a in the foundation pit by adopting a conventional support structure.
In order to achieve the above object, a combined support for a welt local deep foundation pit in a foundation pit is provided, which comprises:
the enclosure structure comprises a foundation pit enclosure pile and a cast-in-situ pile, wherein the foundation pit enclosure pile is arranged along the outer edge of a foundation pit in a circle, the cast-in-situ pile is arranged along the outer edge of a local deep foundation pit at the welt, two sides of the cast-in-situ pile are respectively connected to the inner side of the foundation pit enclosure pile, and the cast-in-situ pile and the foundation pit enclosure pile are enclosed to form a closed space;
the inner support structure comprises an inclined cast support and a horizontal support, the inclined cast support stretches across and is arranged above the welt local deep foundation pit, the horizontal support is arranged in the welt local deep foundation pit, the upper end of the inclined cast support is connected to the inner side of the foundation pit fender post, the lower end of the inclined cast support is connected to the bottom plate of the foundation pit, and the two ends of the horizontal support are respectively connected between the inner side of the foundation pit fender post and the inner side of the bored pile;
The first reinforcing pile is used for supporting the bottom plate of the welt local deep foundation pit, is arranged on the inner side of the foundation pit fender post and is attached to the inner side of the foundation pit fender post; and
and the second reinforcing pile is used for supporting the bottom plate of the welt local deep foundation pit, is arranged on the outer side of the cast-in-situ bored pile and is abutted against the outer side of the cast-in-situ bored pile.
Further, the first reinforcing pile and the second reinforcing pile are cement mixing piles.
Furthermore, the horizontal support is a section steel support.
Furthermore, the inclined throwing support is a steel pipe inclined throwing support.
The utility model has the advantages that the combined support of the welt local deep foundation pit in the foundation pit adopts a combined support form of row piles (namely foundation pit enclosing piles and cast-in-situ piles) and inner supports, one of the two inner supports of the welt local deep pit is an inclined cast support, and the other one is a section steel inner support.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural view of a combined support of a welt local deep foundation pit in a foundation pit according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a horizontal support according to an embodiment of the present invention.
Fig. 3 is a sectional view of a combined support of a welt partial deep foundation pit in the foundation pit according to the embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not to be construed as limiting the utility model. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 to 3, the present invention provides a combined support for a welt partial deep foundation pit in a foundation pit, including: the building envelope structure comprises a building envelope structure 1, an inner support structure 2, a first reinforcing pile 3 and a second reinforcing pile 4.
The building enclosure 1 comprises a foundation pit guard pile 11 and a cast-in-situ bored pile 12. The foundation pit fender pile 11 and the cast-in-situ bored pile 12 are row piles.
In this embodiment, a foundation pit fender pile 11 is embedded in the outer edge of the foundation pit a. The foundation pit fender pile 11 sets up the round along the outer edge of foundation pit A and is closed structure. The enclosure structure of the combined support of the welt local deep foundation pit in the foundation pit is characterized in that three-side cast-in-situ bored piles 12 are newly built by means of original foundation pit enclosure piles, and the newly built cast-in-situ bored piles 12 are arranged along the outer edge of the welt local deep foundation pit a. Two sides of the cast-in-situ bored pile 12 are connected to the inner side of the foundation pit fender pile 11, respectively. The cast-in-situ bored pile 12 and the foundation pit fender pile 11 enclose to form a closed space.
The inner support structure 2 comprises an inclined throwing support and a horizontal support. As shown in fig. 1 and 3, the first-course inner support above the welt local deep foundation pit is an inclined cast support 21, and the inclined cast support spans over the welt local deep foundation pit a. The upper end of the inclined cast-off support 21 is connected to the upper part of the inner side of the foundation pit fender post 11, and the lower end of the inclined cast-off support 21 is connected to the bottom plate B of the foundation pit A.
As shown in fig. 1 and 2, the first-course inner support above the welt local deep foundation pit is a horizontal support. The horizontal support is arranged in the welt local deep foundation pit a. One end of the horizontal support 22 is connected to the inner side of the foundation pit fender pile 11, and the other end of the horizontal support 22 is connected to the inner side of the cast-in-situ bored pile 12.
The combined support of the welt local deep foundation pit in the foundation pit further comprises a first reinforcing pile 3 for supporting the bottom plate b of the welt local deep foundation pit a and a second reinforcing pile 4 for supporting the bottom plate b of the welt local deep foundation pit a.
Wherein, first reinforcement pile 3 sets up in the inboard of foundation ditch fender pile 11, and just first reinforcement pile 3 laminates in the inboard of foundation ditch fender pile 11.
The second reinforcement piles 4 are arranged outside the cast-in-place piles 12 and the second reinforcement piles 4 abut against the outside of the cast-in-place piles 12.
Compared with the conventional scheme, the combined support of the welt local deep foundation pit in the foundation pit can maximally approach the side line of the basement to the ground red line on the premise of ensuring safety and quality, has short project construction period and low comprehensive cost, reduces the using amount of reinforcing steel bars required by the conventional trestle bridge and breaks away the generated building waste, and is favorable for improving the overall benefits of the project.
In the present embodiment, the first and second reinforcing piles 3 and 4 are cement mixing piles.
As a preferred implementation mode, the foundation pit fender pile is formed by inserting section steel into a triaxial cement-soil mixing pile.
In the present embodiment, the horizontal brace 22 is a steel brace. The inclined throwing support 21 is a steel pipe inclined throwing support. The steel pipe inclined throwing support is formed by combining a concrete capping beam with the steel pipe inclined throwing support. The local part of the horizontal support adopts a reinforced concrete corner support.
The cross section of the concrete top ring beam is 1200mm multiplied by 800mm, and the concrete strength grade is C30; the end part of the steel pipe in the steel pipe inclined throwing support is provided with a loose head capable of applying prestress, the concrete capping beam can apply prestress to the steel support after reaching the design strength, and each steel pipe support applies 800KN of prestress in two times, wherein 400KN is applied each time.
The cast-in-situ bored pile 12 is used as a partial temporary fender pile, and the concrete design strength rating of the cast-in-situ bored pile is C30 (underwater C30), the cross-sectional dimension of the purlin at the top of the cast-in-situ bored pile is 900mm × 600mm, and the strength rating of the cast-in-situ bored pile is C30.
When a welt local deep foundation pit is excavated, slope excavation is carried out within the width range of about 12m of the pit edge, earthwork chamber jumping excavation is carried out, steel pipe inclined throwing support installation and prestress application are carried out after the bottom plate inclined throwing support bracket reaches the design strength, and then earthwork excavation and bottom plate construction in the soil excavation region are carried out.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (4)
1. The utility model provides a combination of welt local deep basal pit in foundation ditch is strutted, its characterized in that includes:
the enclosure structure comprises a foundation pit enclosure pile and a cast-in-situ pile, wherein the foundation pit enclosure pile is arranged along the outer edge of a foundation pit in a circle, the cast-in-situ pile is arranged along the outer edge of a local deep foundation pit at the welt, two sides of the cast-in-situ pile are respectively connected to the inner side of the foundation pit enclosure pile, and the cast-in-situ pile and the foundation pit enclosure pile are enclosed to form a closed space;
the inner support structure comprises an inclined cast support and a horizontal support, the inclined cast support stretches over the welt local deep foundation pit, the horizontal support is arranged in the welt local deep foundation pit, the upper end of the inclined cast support is connected to the inner side of the foundation pit fender post, the lower end of the inclined cast support is connected to the bottom plate of the foundation pit, and the two ends of the horizontal support are respectively connected between the inner side of the foundation pit fender post and the inner side of the bored pile;
The first reinforcing pile is used for supporting the bottom plate of the welt local deep foundation pit, is arranged on the inner side of the foundation pit fender post and is attached to the inner side of the foundation pit fender post; and
and the second reinforcing pile is used for supporting the bottom plate of the welt local deep foundation pit, is arranged on the outer side of the cast-in-situ bored pile and is abutted against the outer side of the cast-in-situ bored pile.
2. The combination support for a welt partial deep foundation pit in a foundation pit according to claim 1, wherein the first and second reinforcing piles are cement-mixed piles.
3. The combined support for a welt partial deep foundation pit in a foundation pit according to claim 1, wherein the horizontal support is a steel section support.
4. The combination support for a welt partial deep foundation pit in a foundation pit according to claim 1, wherein the inclined throw brace is a steel pipe inclined throw brace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122680808.7U CN216839463U (en) | 2021-11-04 | 2021-11-04 | Combined support of welt local deep foundation pit in foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122680808.7U CN216839463U (en) | 2021-11-04 | 2021-11-04 | Combined support of welt local deep foundation pit in foundation pit |
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| Publication Number | Publication Date |
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| CN216839463U true CN216839463U (en) | 2022-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122680808.7U Active CN216839463U (en) | 2021-11-04 | 2021-11-04 | Combined support of welt local deep foundation pit in foundation pit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115506362A (en) * | 2022-09-02 | 2022-12-23 | 中国建筑第二工程局有限公司 | Muddy soil body deep and shallow foundation pit supporting structure and construction method thereof |
-
2021
- 2021-11-04 CN CN202122680808.7U patent/CN216839463U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115506362A (en) * | 2022-09-02 | 2022-12-23 | 中国建筑第二工程局有限公司 | Muddy soil body deep and shallow foundation pit supporting structure and construction method thereof |
| CN115506362B (en) * | 2022-09-02 | 2023-07-25 | 中国建筑第二工程局有限公司 | Mucky soil deep and shallow foundation pit supporting structure and construction method thereof |
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