CN112942374A - Open-cut and hidden-support foundation pit supporting structure and construction method thereof - Google Patents
Open-cut and hidden-support foundation pit supporting structure and construction method thereof Download PDFInfo
- Publication number
- CN112942374A CN112942374A CN202110175657.1A CN202110175657A CN112942374A CN 112942374 A CN112942374 A CN 112942374A CN 202110175657 A CN202110175657 A CN 202110175657A CN 112942374 A CN112942374 A CN 112942374A
- Authority
- CN
- China
- Prior art keywords
- foundation pit
- construction
- excavation
- advanced
- grouting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Foundations (AREA)
Abstract
A foundation pit supporting structure of open cut hidden branch and a construction method thereof belong to the technical field of deep foundation pit engineering. It includes that two symmetries set up the big tubular pile in advance in the foundation ditch, two big tubular piles in advance set up between two current situation buildings, top between two big tubular piles in advance is provided with the capping beam, the foundation ditch inner wall and the foundation ditch bottom of both sides all are equipped with first preliminary bracing, be equipped with a plurality of leading slip casting tubules around first preliminary bracing, the outer end of leading slip casting tubule inserts in the foundation ditch inner wall, be located and be equipped with the temporary support on the foundation ditch inner wall between two big tubular piles in advance, big tubular pile in advance, first preliminary bracing, vertical preliminary bracing is constituteed to leading slip casting tubule and temporary support. The structure of the invention adopts the advanced large pipe pile, the advanced grouting small pipe, the grouting reinforcement of the small pipe in the passive region of the basement, the temporary support and hanging of the reinforcing mesh for spraying the concrete primary support and the sequential construction of the cast-in-place secondary lining reinforced concrete, thereby ensuring the safety of the adjacent building and the underground pipe network.
Description
Technical Field
The invention belongs to the technical field of deep foundation pit engineering, and particularly relates to a foundation pit supporting structure of open excavation hidden supports and a construction method thereof.
Background
Along with the acceleration of the urbanization process of China, the situation of urban construction land shortage is continuously worsened, the maximized utilization of underground space becomes an urgent demand of people, and the deep foundation pit engineering is in the process of being transported. The development scale of underground space is getting bigger and bigger, so that the existing foundation pit has the characteristics of depth, big size and the like. In addition, in dense urban centers, surrounding complex environments have great influence on foundation pit construction and need to be strictly controlled, otherwise, great hidden danger is brought to urban safety.
Because the situation of land shortage is increasingly remarkable, the situation that deep foundation pit engineering relates to buildings close to the periphery is more and more common, even sometimes foundation pits need to be arranged along the sides, the implementation space of a large-scale enclosure pile arrangement structure is basically not available, and the safety of the adjacent buildings and an underground pipe network cannot be ensured.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a supporting structure of open-cut and hidden-supported foundation pit and a construction method thereof, which are suitable for the construction situation where the deep foundation pit engineering is close to the surrounding building, even the foundation pit needs to be laid along the edge, and ensure the safety of the adjacent building and the underground pipe network.
The invention provides the following technical scheme: the utility model provides an open cut underground supporting's foundation ditch supporting construction which characterized in that: the pile comprises two large advanced pipe piles symmetrically arranged in a foundation pit, wherein the two large advanced pipe piles are arranged between two current buildings, a capping beam is arranged at the top between the two large advanced pipe piles, first primary supports are arranged on the inner wall of the foundation pit and the bottom of the foundation pit at two sides, a plurality of small advanced grouting pipes are arranged around each first primary support, the outer ends of the small advanced grouting pipes are inserted into the inner wall of the foundation pit, a temporary support is arranged on the inner wall of the foundation pit between the two large advanced pipe piles, and the large advanced pipe piles, the first primary supports, the small advanced grouting pipes and the temporary supports form a vertical primary support; and a secondary lining is arranged inside the vertical primary support.
Preferably, the first primary support main body is an I-shaped steel structure, a reinforcing mesh is arranged in the I-shaped steel structure, and the first primary support is sprayed with concrete.
Preferably, the temporary support comprises a group of longitudinal steel arches, and the steel arches are connected through a group of transverse connecting ribs.
Preferably, the temporary support is an I-shaped steel structure, and concrete is sprayed on the I-shaped steel structure.
Preferably, the top of the capping beam is flush with the ground.
A construction method of an open-cut and underground-supported foundation pit supporting structure is characterized by comprising the following steps: the method comprises the following construction steps:
binding steel bars, casting a secondary lining structure bottom plate in situ, and removing temporary supports at corresponding positions;
binding reinforcing steel bars, casting the side walls and the middle plate of the secondary lining structure in situ, and removing temporary supports at corresponding positions;
and 6, binding steel bars, casting a top plate of the secondary lining structure in situ, removing the temporary supports at the corresponding positions, and backfilling to the original ground.
Preferably, the specific construction process of step 2 is as follows: constructing a first excavation region, constructing a small advanced grouting guide pipe in the excavation region, grouting, stabilizing a soil layer in the excavation region, excavating, arranging a temporary support inside a foundation pit around the foundation pit in the excavation region after the excavation is finished, hanging a reinforcing mesh and spraying concrete, constructing a next excavation region on the same construction layer, excavating the excavation region of the next construction layer along the position of the first excavation region, and constructing sequentially according to a preset excavation sequence until the foundation pit is excavated to a substrate.
By adopting the technology, compared with the prior art, the invention has the following beneficial effects:
when the structure is constructed, according to the principle of minimum supporting and retaining structure space and most convenient construction conditions, the method adopts a large advanced pipe pile, a small advanced grouting guide pipe, a small base passive area advanced grouting guide pipe for grouting reinforcement, temporary support and hanging of a reinforcing mesh sprayed concrete primary support and sequential cast-in-place secondary lining of reinforced concrete according to the following excavation and supporting in a shallow underground excavation method, and ensures the safety of adjacent building structures and underground pipe networks.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic sectional view A-A of FIG. 1;
FIG. 3 is a schematic sectional view of the structure of B-B in FIG. 1;
FIG. 4 is a schematic structural view of the structural construction step 1 of the present invention;
FIG. 5 is a schematic structural view of the structural construction step 2 of the present invention;
FIG. 6 is a schematic structural view of the structural construction step 3 of the present invention;
FIG. 7 is a schematic structural view of the structural construction step 4 of the present invention;
FIG. 8 is a schematic structural view of the structural construction step 5 of the present invention;
FIG. 9 is a schematic structural view of the structural construction step 6 of the present invention;
fig. 10 is a schematic view of the grouting reinforcement arrangement of the present invention.
In the figure: 1. advancing the large tubular pile; 2. pressing a top beam; 3. first primary support; 4. a small conduit for advanced grouting; 5. temporary support; 51. a profile steel arch frame.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
Referring to fig. 1-10, a supporting structure of a foundation pit with open excavation and hidden support comprises two big advanced pipe piles 1 symmetrically arranged in the foundation pit, the two big advanced pipe piles 1 are arranged between two existing buildings, a capping beam 2 is arranged at the top between the two big advanced pipe piles 1, and the top of the capping beam 2 is flush with the ground.
Be located both sides foundation ditch inner wall between two leading big tubular piles 1 and foundation ditch bottom and all be equipped with first preliminary bracing 3, this 3 main parts of first preliminary bracing are the I-steel structure, have arranged the reinforcing bar net in the I-steel structure, and the concrete is spouted on the first preliminary bracing 3 upper meshes.
A plurality of advanced grouting small pipes 4 are arranged around the first primary support 3, the outer ends of the advanced grouting small pipes 4 are inserted into the inner wall of the foundation pit, and temporary supports 5 are arranged on the inner wall of the foundation pit between the two advanced large tubular piles 1.
This support 5 temporarily includes a set of fore-and-aft shaped steel bow member 51, is connected through a set of horizontal splice bar between the shaped steel bow member 51, supports 5 temporarily for the I-steel structure, plain shotcrete on the I-steel structure.
The advanced large tubular pile 1, the first primary support 3, the advanced grouting small conduit 4 and the temporary support 5 form a vertical primary support; and a secondary lining is arranged inside the vertical primary support.
The construction steps of the structure of the invention are as follows:
binding reinforcing steel bars, casting the side walls and the middle plate of the secondary lining structure in situ, and removing the temporary supports 5 at the corresponding positions, as shown in figure 8;
and 6, binding steel bars, casting a top plate of the secondary lining structure in situ, removing the temporary supports 5 at the corresponding positions, and backfilling to the original ground as shown in figure 9.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The utility model provides an open cut underground supporting's foundation ditch supporting construction which characterized in that: the pile comprises two large advanced tubular piles (1) symmetrically arranged in a foundation pit, wherein the two large advanced tubular piles (1) are arranged between two current buildings, a capping beam (2) is arranged at the top between the two large advanced tubular piles (1), the inner walls of the foundation pit and the bottom of the foundation pit at two sides are both provided with first primary supports (3), a plurality of small advanced grouting pipes (4) are arranged around the first primary supports (3), the outer ends of the small advanced grouting pipes (4) are inserted into the inner wall of the foundation pit, temporary supports (5) are arranged on the inner wall of the foundation pit between the two large advanced tubular piles (1), and the large advanced tubular piles (1), the first primary supports (3), the small advanced grouting pipes (4) and the temporary supports (5) form a vertical primary support; and a secondary lining is arranged inside the vertical primary support.
2. The open-cut and hidden-supported foundation pit supporting structure as claimed in claim 1, wherein the main body of the first preliminary support (3) is an i-steel structure, a reinforcing mesh is arranged in the i-steel structure, and concrete is sprayed on the first preliminary support (3).
3. An open-cut and hidden-supported foundation pit supporting structure as claimed in claim 1, wherein said temporary support (5) comprises a set of longitudinal steel arches (51), and the steel arches (51) are connected by a set of transverse connecting ribs.
4. The open-cut and hidden-supported foundation pit supporting structure as claimed in claim 3, wherein the temporary support (5) is of an I-steel structure, and concrete is sprayed on the I-steel structure.
5. An open cut underground supporting excavation supporting construction according to claim 1, characterized in that the top of the capping beam (2) is level with the ground.
6. The construction method of the open cut and underground supported pit supporting structure according to claim 1 to 5, characterized in that: the method comprises the following construction steps:
step 1, constructing an advanced large pipe pile (1) and a capping beam (2);
step 2, excavating a foundation pit by a subsection step method: the foundation pit is divided into a plurality of construction layers, each construction layer is divided into a plurality of excavation areas, and the construction is sequentially carried out according to a preset excavation sequence until the foundation pit is excavated to the base;
step 3, after excavating the foundation pit to the base, arranging bottom-sealing section steel and constructing a small advanced grouting guide pipe (4), grouting, hanging a reinforcing mesh and spraying concrete;
binding steel bars, casting a secondary lining structure bottom plate in situ, and removing temporary supports (5) at corresponding positions;
binding reinforcing steel bars, casting the side walls and the middle plate of the secondary lining structure in situ, and removing temporary supports (5) at corresponding positions;
and 6, binding steel bars, casting a top plate of the secondary lining structure in situ, removing the temporary supports (5) at the corresponding positions, and backfilling to the original ground.
7. The construction method of the open cut and underground branch foundation pit supporting structure according to claim 6, characterized in that the specific construction process of the step 2 is as follows: constructing a first excavation region, constructing a small advanced grouting conduit (4) in the excavation region, grouting, stabilizing a soil layer in the excavation region, excavating, arranging a foundation pit internal temporary support (5) around a foundation pit in the excavation region after the excavation is finished, hanging a reinforcing mesh and spraying concrete, constructing a next excavation region on the same construction layer, excavating the excavation region of the next construction layer along the position of the first excavation region, and constructing sequentially according to a preset excavation sequence until the foundation pit is excavated to a substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110175657.1A CN112942374A (en) | 2021-02-07 | 2021-02-07 | Open-cut and hidden-support foundation pit supporting structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110175657.1A CN112942374A (en) | 2021-02-07 | 2021-02-07 | Open-cut and hidden-support foundation pit supporting structure and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112942374A true CN112942374A (en) | 2021-06-11 |
Family
ID=76244487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110175657.1A Pending CN112942374A (en) | 2021-02-07 | 2021-02-07 | Open-cut and hidden-support foundation pit supporting structure and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112942374A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045260A (en) * | 2022-06-29 | 2022-09-13 | 中建三局四川建筑装备有限公司 | Stirring backfilling method of solidified soil |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469802A (en) * | 2013-09-29 | 2013-12-25 | 中国一冶集团有限公司 | Combined lattice steel frame spray anchoring supporting method and combined lattice steel frame spray anchoring supporting structure |
| CN105370288A (en) * | 2015-10-28 | 2016-03-02 | 北京市市政工程设计研究总院有限公司 | Construction method of shallow-buried large-span tunnels |
| CN207891895U (en) * | 2017-12-22 | 2018-09-21 | 武汉市市政建设集团有限公司 | Walkway shaft excavation supporting construction |
| CN109518699A (en) * | 2019-01-23 | 2019-03-26 | 广州地铁集团有限公司 | Miniature steel pipe pile adds grid spray anchor deep foundation ditch combination supporting scheme system and its construction method |
-
2021
- 2021-02-07 CN CN202110175657.1A patent/CN112942374A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469802A (en) * | 2013-09-29 | 2013-12-25 | 中国一冶集团有限公司 | Combined lattice steel frame spray anchoring supporting method and combined lattice steel frame spray anchoring supporting structure |
| CN105370288A (en) * | 2015-10-28 | 2016-03-02 | 北京市市政工程设计研究总院有限公司 | Construction method of shallow-buried large-span tunnels |
| CN207891895U (en) * | 2017-12-22 | 2018-09-21 | 武汉市市政建设集团有限公司 | Walkway shaft excavation supporting construction |
| CN109518699A (en) * | 2019-01-23 | 2019-03-26 | 广州地铁集团有限公司 | Miniature steel pipe pile adds grid spray anchor deep foundation ditch combination supporting scheme system and its construction method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045260A (en) * | 2022-06-29 | 2022-09-13 | 中建三局四川建筑装备有限公司 | Stirring backfilling method of solidified soil |
| CN115045260B (en) * | 2022-06-29 | 2024-07-23 | 中建三局集团有限公司 | Stirring backfilling method for solidified soil |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107313431B (en) | Close on not contour foundation pit method for synchronously constructing | |
| CN105464686B (en) | Multi-layer underground space curtain posture excavating construction method and supporting construction under existing facility | |
| CN109026064B (en) | Construction method for large-span multi-arch tunnel with semi-bright and semi-dark | |
| CN101509263A (en) | Digging method foundation pit structure of steel cover and plate cover, and construction method | |
| CN104264688A (en) | Manual hole digging non-uniform pile support construction technology | |
| CN102995659B (en) | Method for constructing from central area to periphery of ultra-large type underground engineering | |
| CN107794946B (en) | Underground comprehensive pipe rack structure deeply buried in soft soil and construction method thereof | |
| CN210086295U (en) | Compound assembled underground structure | |
| CN112983478A (en) | Shallow-buried underground tunnel foundation pit construction method under protection of cover plate | |
| CN104184097B (en) | Non-migration suspension protection system and method for communication pipes and cables | |
| CN115653000A (en) | Gravity pipe gallery in-situ protection structure system in foundation pit range and construction method | |
| CN112922646B (en) | Building method of underground excavation station excavated by large-section single-span support through superposed arch-wall integrated type | |
| CN112065467B (en) | Underground engineering supporting structure and construction method thereof | |
| CN213143117U (en) | Assembled keyway basis retaining wall structure | |
| CN109898556A (en) | A kind of underground pipe gallery structure and sunk type construction method | |
| CN111255462B (en) | Pipe curtain cover excavation top-down construction method for subway station construction | |
| CN112942374A (en) | Open-cut and hidden-support foundation pit supporting structure and construction method thereof | |
| CN110761795B (en) | Construction method of shallow tunnel in loess gully | |
| CN110616739B (en) | Vertical construction method for underground space of existing building | |
| CN110939139B (en) | Pile plate wall structure based on rigid contact of post-pile special-shaped retaining wall and construction method thereof | |
| CN110117959B (en) | Construction method for foundation pit support near river | |
| CN209941754U (en) | High-voltage power pipe culvert in-situ protection structure | |
| CN209760299U (en) | light and shade of avoiding house to tear open and move is dug and is combined subway station structure | |
| CN213476893U (en) | Supporting structure for spanning large underground pipeline foundation pit | |
| CN110792440B (en) | Construction method of water-rich loess tunnel penetrating through loess towards valley |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210611 |
|
| RJ01 | Rejection of invention patent application after publication |