CN217419658U - Underground vehicle base foundation pit enclosure structure - Google Patents
Underground vehicle base foundation pit enclosure structure Download PDFInfo
- Publication number
- CN217419658U CN217419658U CN202220871883.3U CN202220871883U CN217419658U CN 217419658 U CN217419658 U CN 217419658U CN 202220871883 U CN202220871883 U CN 202220871883U CN 217419658 U CN217419658 U CN 217419658U
- Authority
- CN
- China
- Prior art keywords
- pit
- foundation pit
- support
- branch
- vehicle base
- 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.)
- Active
Links
Images
Landscapes
- Foundations (AREA)
Abstract
The utility model relates to a foundation pit construction technical field, in particular to a foundation pit retaining structure of an underground vehicle base, wherein the foundation pit is divided into a foundation pit group consisting of a plurality of sub pits along the direction of a relative long edge of the foundation pit; constructing a retaining wall and an inner support in each branch pit of the foundation pit group respectively, wherein the inner support comprises three supports arranged from top to bottom along the depth direction of the foundation pit; and adjacent branch pits are separated and supported through an intermediate wall. The utility model has the advantages that: aiming at the problem that no engineering case or technical guide exists in super-large-scale super-large net high deep foundation pit engineering brought by underground vehicle bases in China, particularly in soft soil areas at present, a novel foundation pit engineering scheme is systematically provided after reasonable argument; not only can provide technical reference for similar projects, but also can effectively guide later-stage construction, thereby achieving the purposes of improving the construction efficiency, saving the construction cost, improving the construction quality and realizing fine-quality projects.
Description
Technical Field
The utility model belongs to the technical field of the foundation ditch construction technique and specifically relates to an underground vehicle base foundation ditch retaining structure.
Background
At present, the large foundation pit in China, particularly the large foundation pit in a soft soil area, has fewer project cases. The vehicle base belongs to an industrial building with super-large scale and ultrahigh headroom due to the particularity of process requirements and the like. When the vehicle base is buried underground, the vehicle base is an underground space body with larger buried depth, and a special design method of a foundation pit support structure in the excavation and construction process of the foundation pit needs to be fully considered in the engineering implementation process.
At present, most of domestic underground spaces are multi-layer basements, longitudinal and transverse walls in a plane are staggered, and vertical walls are arranged in a layered mode. The foundation pit supporting scheme is simple and clear in the force transmission path under the back-building working condition, and the foundation pit deformation is easy to control. The investigation of more domestic large foundation pit cases shows that most foundation pits select the angle contact between the pit divisions implemented at the same time when dividing the pits, so that the strongly-related areas of mutual influence of the foundation pits are reduced.
When the rail transit or urban railway vehicle base is placed underground, the size of the foundation pit is usually 200 meters wide and 1000 meters long. In large-scale foundation pit engineering, particularly foundation pit engineering in soft soil areas, the project experience of the pit division scheme is temporarily unavailable for reference. The vehicle base is arranged underground, the burial depth of the vehicle base is generally as high as that of a conventional 3-layer basement, but the vehicle base belongs to a high-clearance single-layer basement, due to process requirements, the vehicle base is generally arranged into a frame structure, a whole dozens of thousands of square underground spaces are not provided with shear wall intermediate walls, lateral stiffness cannot be effectively provided in the back construction stage, lateral soil pressure cannot be effectively transmitted to adjacent foundation pits, namely foundation pit engineering brought by the underground vehicle base belongs to super-large-scale super-large-clearance deep foundation pit engineering, the arrangement scheme of a foundation pit supporting system needs to be specially designed, and no corresponding scheme exists at present.
Disclosure of Invention
The utility model aims at providing an underground vehicle base foundation pit retaining structure according to the not enough of above-mentioned prior art, through adopting reasonable branch hole scheme and interior support arrangement form, realize the foundation ditch construction of the underground vehicle base of super large scale, super high headroom, not only can provide the technique for similar engineering and reference, still can effectively guide the later stage construction to reach the purpose that improves the efficiency of construction, practices thrift construction cost, promotes construction quality, realizes the fine work engineering.
The utility model discloses the purpose is realized accomplishing by following technical scheme:
the utility model provides an underground vehicle base foundation ditch retaining structure for the foundation ditch construction of super large-scale, super high headroom's underground vehicle base, its characterized in that: the foundation pit is divided into a foundation pit group consisting of a plurality of branch pits along the direction of the relative long edge of the foundation pit; constructing a retaining wall and an inner support in each branch pit of the foundation pit group respectively, wherein the inner support comprises three supports arranged from top to bottom along the depth direction of the foundation pit; and adjacent branch pits are separated and supported through an intermediate wall.
The first support of the inner support is connected with the enclosure wall through a crown beam, and the second support and the third support are respectively connected with the enclosure wall or the intermediate wall through a second waist beam and a third waist beam.
The enclosure wall and the main structure side wall are connected through steel bars to form an integral structure.
And the second waist rail and the third waist rail are reserved with steel bar connectors, and the second waist rail and the third waist rail can pass through the steel bar connectors to be connected with the side walls and wall columns of the main structure.
The elevation of the second support and the elevation of the third support in each branch pit are the same.
The inner support is provided with a supporting upright post, an underground base engineering pile is arranged in the branch pit, and the supporting upright post is arranged on the underground base engineering pile.
And the inner support is provided with an overhanging part corresponding to the position of the support upright post.
The utility model has the advantages that:
1) aiming at the problem that no engineering case or technical guide exists in super-large-scale super-large net high deep foundation pit engineering brought by underground vehicle bases in China, particularly in soft soil areas at present, a novel foundation pit engineering scheme is systematically provided after reasonable argument; not only can provide technical reference for similar projects, but also can effectively guide later-stage construction, thereby achieving the purposes of improving the construction efficiency, saving the construction cost, improving the construction quality and realizing fine-quality projects.
2) The length and the number of the intermediate walls are effectively controlled, and the main body structure is convenient to build; the mutual influence among the branch pits of the foundation pit group is greatly reduced, particularly the space influence at the sharp corners of the adjacent branch pits is greatly reduced, the safety during the construction of the foundation pit is improved, and the control of the settlement of the peripheral earth surface is facilitated; furthermore, a more regular, open material yard and traffic route is provided for the construction period.
3) The enclosure wall of the foundation pit and the side wall of the main structure are connected into a whole, so that higher lateral rigidity is provided, the size of the side wall can be effectively reduced, and meanwhile, the side wall is favorable for water resistance.
4) The wale, the side wall of the main structure and the wall column are connected into a whole, so that the lateral force resistance is improved, and the earthquake force resistance is facilitated.
5) When the support is arranged, the position of the engineering pile of the underground vehicle base is taken into consideration by the arrangement position of the stand column, the engineering pile of the underground base is used as the pile foundation of the temporary stand column to the greatest extent, the utilization rate is up to 80 percent, the temporary engineering quantity of foundation pit support can be effectively reduced, the construction period is saved, the construction is convenient, and the manufacturing cost is reduced.
Drawings
FIG. 1 is a schematic view of a pit division scheme of a foundation pit in the utility model;
fig. 2 is a schematic plan view of the foundation pit supporting structure of the utility model;
fig. 3 is a schematic view of the sectional layout of the supporting structure of the foundation pit of the utility model;
fig. 4 is the utility model discloses support in the well foundation ditch and the plane layout sketch map of support post.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:
as shown in fig. 1-4, reference numerals 1-17 in the drawings denote: no. 1, No. 2, No. 3, No. 4, No. 5, mid-board 6, enclosure wall 7, major structure side wall 8, wall column 9, interior support 10, first support 11, second support 12, third support 13, waist rail 14, crown beam 15, upright column 16, support column 17.
Example (b): the underground vehicle base foundation enclosure structure in the embodiment is used for constructing the foundation pit shown in fig. 1, and the foundation pit meets the requirements of an underground vehicle base on ultra-large scale and ultra-high clearance.
With reference to fig. 1 to 4, the enclosure structure of the present embodiment is implemented by the following steps:
1) firstly, the foundation pit is divided into a foundation pit group consisting of a first branch pit 1, a second branch pit 2, a third branch pit 3, a fourth branch pit 4 and a fifth branch pit 5 along the long side direction of the longer side of the foundation pit, and all the branch pits are adjacent in sequence. The foundation pit group is constructed in stages, the stage construction is divided into a first-stage foundation pit and a second-stage foundation pit in an interval mode, in the embodiment, a first-stage pit 1, a third-stage pit 3 and a fifth-stage pit 5 are used as the first-stage foundation pit, and a second-stage pit 2 and a fourth-stage pit 4 are used as the second-stage foundation pit.
2) Constructing a retaining wall 7, a crown beam 15 and a first support 11 of a first stage foundation pit (a first pit 1, a third pit 3 and a fifth pit 5), and applying the supporting force of the first support 11 on the retaining wall 7 through the crown beam 15. And after the construction is finished, maintaining the structure until the designed strength is reached.
3) And synchronously excavating earthwork layer by layer in the first branch pit 1, the third branch pit 3 and the fifth branch pit 5 to the elevation of the second support 12, applying the second support 12 and a wale 14 corresponding to the second support, and applying the supporting force of the second support 12 to the enclosure wall 7 through the wale 14. After the application is completed, the second support 12 is cured to reach the designed strength.
4) And synchronously excavating earthwork layer by layer in the first branch pit 1, the third branch pit 3 and the fifth branch pit 5 until the elevation of a third support 13, applying the third support 13 and a wale 14 corresponding to the third support 13, and applying the supporting force of the third support 13 to the enclosure wall 7 through the wale 14. After the construction is completed, the third support 13 is cured until the design strength is reached.
5) And synchronously excavating earthwork in the first branch pit 1, the third branch pit 3 and the fifth branch pit 5 layer by layer until the elevation of the substrate, constructing a cushion layer, pouring a main structure bottom plate, and maintaining until the design strength is reached.
6) Building main structure side walls 8 and wall pillars 9 in the first branch pits 1, the third branch pits 3 and the fifth branch pits 5, and simultaneously completing the connection of the main structure side walls 8 and the enclosure walls 7, the main structure side walls 8 and the wall pillars 9 and the wales 14; and (5) performing back construction until the main structure top plate is completely poured and reaches the design strength. Through passing through the steel bar connection formation wholly with 7 two walls of enclosure wall and the 8 walls of major structure side wall, can not only provide higher lateral rigidity, waterproof also good to underground structure side wall, still can have the wall thickness and the arrangement of reinforcement that reduce little major structure side wall 8, avoid under the super high headroom condition, singly lean on the major structure wall to resist the side soil pressure and make the wall body thicker and the very big condition of arrangement of reinforcement.
In this embodiment, the reinforcing bar connectors are respectively reserved on the second wale and the third wale, and when the main structure side wall 8 and the wall post 9 are built back, the reinforcing bars of the second wale and the third wale are connected with the reinforcing bar connectors, so that the wale 14, the main structure side wall 8 and the wall post 9 are connected to form an integral lateral force resisting member, and a great effect is exerted on resisting the earthquake force.
In this embodiment, when the first sub-pit 1, the third sub-pit 3, and the fifth sub-pit 5 as the first stage foundation pit are excavated and built in advance, the second sub-pit 2 and the fourth sub-pit 4 serve as safety isolation zones between the adjacent sub-pits of the first stage foundation pit, that is, the second sub-pit 2 serves as a safety isolation zone between the first sub-pit 1 and the third sub-pit 3, and the fourth sub-pit 4 serves as a safety isolation zone between the third sub-pit 3 and the fifth sub-pit 5, so that mutual influence of construction of the adjacent pits is greatly reduced. Meanwhile, the second stage pit 2 and the fourth stage pit 4 which are used as second stage pits are subjected to the minimum soil pressure on the side of the periphery of the pit during construction, namely, during the excavation of the second stage pit, only two short sides in the vertical direction shown in the figure 1 are directly adjacent to the soil, and the soil pressure on the left side and the right side is greatly reduced due to the friction force of the bottom plate of the return construction structure, so that the safety during the construction of the pit is greatly improved, the control of the settlement of the peripheral earth surface is facilitated, a regular and open material yard and a traffic route are provided for the construction period, and the method is particularly suitable for large deep pits in soft soil areas.
In this embodiment, a retaining wall 7 is used on each soil facing side of the first stage foundation pit and the second stage foundation pit, and an intermediate wall 6 is used between adjacent sides of the first stage foundation pit and the second stage foundation pit instead of the retaining wall 7 as a partition supporting structure, for example, as shown in fig. 2, an intermediate wall 6 is used between the first stage pit 1 and the second stage pit 2.
7) When the primary foundation pit finishes the main structure roof pouring and reaches the design strength, the enclosure wall 7, the crown beam 15 and the first support 11 of the secondary foundation pit (the second branch pit 2 and the fourth branch pit 4) are constructed at the same time and reach the design strength.
8) And excavating earthwork in the second pit division 2 and the fourth pit division 4 synchronously and hierarchically until the elevation of the second support 12, and constructing the second support 12 and a waist beam 14 corresponding to the second support 12. The second support 12 is cured to the design strength. The elevation of the second support 12 in the second branch pit 2 and the fourth branch pit 4 is consistent with the elevation of the second support in the first stage foundation pit.
9) And synchronously excavating earthwork layer by layer in the second branch pit 2 and the fourth branch pit 4 until the elevation of the third support 13, and constructing the third support 13 and a waist beam 14 corresponding to the third support 13. And curing the third support 13 to reach the designed strength. The elevation of the third support 13 in the second branch pit 2 and the fourth branch pit 4 is consistent with the elevation of the third support in the first stage foundation pit.
10) And synchronously excavating earthwork in the second branch pit 2 and the fourth branch pit 4 in layers until the elevation of the substrate is reached, constructing a cushion layer, pouring a main structure bottom plate, and maintaining until the design strength is reached.
11) Building the main structure side walls 8 and the wall columns 9 in the second branch pits 2 and the fourth branch pits 4, and simultaneously completing the connection of the main structure side walls 8 and the enclosure walls 7, the main structure side walls 8 and the wall columns 9 with the waist beams 14; and (5) performing back construction until the main structure top plate is completely poured and reaches the design strength.
12) And (3) sequentially removing the third support 13, the second support 12, the first support 11 and the intermediate wall 6, and closing the reserved holes on the top plate of the main body structure. This embodiment is through in the structure stage of building back, and support 12 with the second and support 13 with the third and remain all the time, demolish after reaching intensity until all structure roof seals, guarantee to build back the effective transmission of stage side soil pressure, support effective transmission side soil pressure through the reservation with the height to further ensure the stability and the security of foundation ditch, be particularly suitable for the construction of the big clearance structure of the no intermediate level floor panel of vehicle foundation class.
In the embodiment, in specific implementation: as shown in fig. 4, when the inner support 10 is arranged, it is supported by the support column 17, and the position of the support column 17 is considered as the position of the column pile 16 as the engineering pile of the underground vehicle base, so that the temporary construction amount of foundation pit support can be effectively reduced, the construction period can be saved, the construction is convenient, and the manufacturing cost can be reduced. In the embodiment, in order to further improve the utilization rate, the inner support 10 is cantilevered to be partially extended or the local distance between the inner supports 10 is adjusted, so that the underground vehicle base engineering pile is utilized as the pile foundation of the temporary column to the maximum extent, and meanwhile, the supporting effect of the support column 17 on the inner support 10 can be effectively improved.
Although the conception and the embodiments of the present invention have been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims, and therefore, the description thereof is not repeated herein.
Claims (7)
1. The utility model provides an underground vehicle base foundation ditch retaining structure for the foundation ditch construction of the underground vehicle base of super large-scale, super high headroom, its characterized in that: the foundation pit is divided into a foundation pit group consisting of a plurality of branch pits along the direction of the relative long edge of the foundation pit; constructing a retaining wall and an inner support in each branch pit of the foundation pit group respectively, wherein the inner support comprises three supports which are sequentially arranged from top to bottom along the depth direction of the foundation pit; and adjacent branch pits are separated and supported through an intermediate wall.
2. An underground vehicle base pit enclosure as claimed in claim 1, wherein: the first support of the inner support is connected with the enclosure wall through a crown beam, and the second support and the third support are respectively connected with the enclosure wall or the intermediate wall through a second waist beam and a third waist beam.
3. An underground vehicle base pit enclosure as claimed in claim 2, wherein: the enclosure wall and the side wall of the main structure are connected through steel bars to form an integral structure.
4. An underground vehicle base pit enclosure as claimed in claim 2, wherein: and the second waist rail and the third waist rail are reserved with steel bar connectors, and the second waist rail and the third waist rail can pass through the steel bar connectors to be connected with the side walls and wall columns of the main structure.
5. An underground vehicle base pit enclosure as claimed in claim 1, wherein: the elevation of the second support and the elevation of the third support in each branch pit are the same.
6. An underground vehicle base pit enclosure as claimed in claim 1, wherein: the inner support is provided with a supporting upright post, an underground base engineering pile is arranged in the branch pit, and the supporting upright post is arranged on the underground base engineering pile.
7. The underground vehicle base pit enclosure structure of claim 6, wherein: and the inner support is provided with an overhanging part corresponding to the position of the support upright post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220871883.3U CN217419658U (en) | 2022-04-15 | 2022-04-15 | Underground vehicle base foundation pit enclosure structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220871883.3U CN217419658U (en) | 2022-04-15 | 2022-04-15 | Underground vehicle base foundation pit enclosure structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217419658U true CN217419658U (en) | 2022-09-13 |
Family
ID=83182345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220871883.3U Active CN217419658U (en) | 2022-04-15 | 2022-04-15 | Underground vehicle base foundation pit enclosure structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217419658U (en) |
-
2022
- 2022-04-15 CN CN202220871883.3U patent/CN217419658U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114673162B (en) | Underground vehicle foundation pit construction method | |
| CN106088650B (en) | A kind of method and building suitable for building with brick-concrete structure underground increasing layer | |
| CN108589771B (en) | Construction method for layer-adding transfer node of operated underground station | |
| CN112031026A (en) | Permanent-temporary combined open-cut and smooth-built structure for subway station and construction method | |
| CN104131565B (en) | A kind of against making the construction method that the earthwork is just made to excavate | |
| CN111236241B (en) | Weak water-rich stratum subway foundation pit reinforcing excavation method based on half-cover excavation method | |
| CN109056810B (en) | Transverse expanding excavation structure of underground main body structure of open excavation or cover excavation below existing building and construction method thereof | |
| CN110878562B (en) | Method for in-situ excavation of foundation pit and new addition of underground structure under existing reserved building | |
| CN110593306A (en) | Large-area underground space structure spanning operation subway tunnel and construction method thereof | |
| CN104652444A (en) | Construction method for overall reverse operation of ultra-large type deep foundation pit center island type alternative earth excavation | |
| CN112922646B (en) | Building method of underground excavation station excavated by large-section single-span support through superposed arch-wall integrated type | |
| CN105064711A (en) | Method for constructing underground garage between residential buildings | |
| CN213038379U (en) | Open cut tunnel foundation pit backfilling structure | |
| CN217419658U (en) | Underground vehicle base foundation pit enclosure structure | |
| CN108316314A (en) | A kind of inner supporting structure for solving to cheat biasing problem in depth foundation pit | |
| CN116770888A (en) | Construction method of subway station structure combining cover excavation and underground excavation | |
| CN210797573U (en) | Underground structure internal transportation system based on under-board sliding groove | |
| CN211257899U (en) | Translation construction structure of existing building additional basement | |
| CN210459300U (en) | Enclosure structure for covering and digging station | |
| CN108193708B (en) | Existing underground space horizontal construction method | |
| CN112411556A (en) | Foundation pit structure and construction method thereof | |
| CN215594059U (en) | Inverted frame superposed supporting system suitable for ultra-deep working well | |
| CN111335670A (en) | Method for constructing foundation pit and newly adding underground structure in situ under existing reserved building | |
| CN210975826U (en) | Unequal-height h-shaped supporting structure used for close proximity structure in narrow space | |
| CN219637957U (en) | Subway station structure system combining cover excavation and underground excavation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |