CN209924997U - Anti-floating construction structure for crossing existing subway tunnel on urban tunnel - Google Patents
Anti-floating construction structure for crossing existing subway tunnel on urban tunnel Download PDFInfo
- Publication number
- CN209924997U CN209924997U CN201821698101.0U CN201821698101U CN209924997U CN 209924997 U CN209924997 U CN 209924997U CN 201821698101 U CN201821698101 U CN 201821698101U CN 209924997 U CN209924997 U CN 209924997U
- Authority
- CN
- China
- Prior art keywords
- tunnel
- mjs
- urban
- subway tunnel
- piles
- 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
- Lining And Supports For Tunnels (AREA)
Abstract
The utility model discloses an anti-floating construction structure of crossing existing subway tunnel on urban tunnel, existing excavation has in the upper region of subway tunnel the foundation ditch of urban tunnel, its characterized in that anti-floating construction structure is including setting up in the subway tunnel with the MJS ground back up coat between the foundation ditch and set up in each subway tunnel both sides along the drilling uplift pile that its extending direction was arranged, the MJS ground back up coat links as an organic whole with the drilling uplift pile; the inner walls of two sides of the foundation pit are respectively provided with a row of fender piles, two layers of concrete bottom plates are arranged above the MJS reinforcing layer, and the concrete bottom plates, the drilled uplift piles and the fender piles are connected into a whole. The utility model has the advantages that: through setting up drilling uplift pile and MJS ground back up coat, can prevent that existing subway tunnel from floating upward, do not influence its normal operation in the work progress.
Description
Technical Field
The utility model relates to a tunnel construction technical field, concretely relates to urban tunnel goes up anti come-up construction structures who strides existing subway tunnel.
Background
In urban mass business areas and urban tunnel construction, the subway tunnel in operation is often needed to be striden, because the buried depth of the existing subway tunnel is generally shallow, the clear distance between the urban tunnel and the subway tunnel is smaller, if the earth volume above the existing subway tunnel is excavated by a large section, the unloading effect of the soil body below the excavation surface can be caused, and in addition, the construction disturbance to the soil body can often cause the lower subway tunnel to generate uplift deformation. The deformation can be increased along with the reduction of the thickness of an overlying soil layer and the net distance between an urban tunnel and an existing subway tunnel, and the uplift deformation is mainly concentrated on the construction area of the urban tunnel across the existing subway tunnel, so that the existing subway tunnel is easy to crack due to uneven deformation in the longitudinal direction. Thereby can lead to the upper portion ground to cave in, the subway tunnel come-up to seriously influence the normal operation and the safety of subway tunnel.
Disclosure of Invention
The utility model aims at providing an according to the weak point of above-mentioned prior art, provide an anti come-up construction structures of crossing existing subway tunnel on the urban tunnel, this anti come-up construction structures forms MJS ground back up layer through the construction in existing subway tunnel top to at the construction drilling uplift stake in existing subway tunnel both sides, make drilling uplift stake and MJS ground back up layer together form the anti structure of door font, play and prevent that existing subway tunnel from taking place the condition of come-up in urban tunnel work progress.
The utility model discloses the purpose is realized accomplishing by following technical scheme:
an anti-floating construction structure for crossing an existing subway tunnel on the urban tunnel, wherein a foundation pit of the urban tunnel is excavated in an area above the existing subway tunnel, and is characterized in that the anti-floating construction structure comprises an MJS foundation reinforcing layer arranged between the subway tunnel and the foundation pit and drilling uplift piles arranged on two sides of each subway tunnel along the extension direction of the foundation pit, wherein the MJS foundation reinforcing layer and the drilling uplift piles are connected into a whole; the inner walls of two sides of the foundation pit are respectively provided with a row of fender piles, two layers of concrete bottom plates are arranged above the MJS reinforcing layer, and the concrete bottom plates, the drilled uplift piles and the fender piles are connected into a whole.
The cross section of the MJS foundation reinforcing layer along the width direction of the urban tunnel is in a concave shape.
The MJS foundation reinforcing layer comprises a plurality of MJS jet grouting reinforcing piles which are arranged in a soil body above the subway tunnel at intervals.
The diameter of the MJS jet grouting reinforcement pile is 2 m.
The arrangement distance of the MJS jet grouting reinforcement piles in the extending direction of the urban tunnel is 1.6-1.7m, and the arrangement distance of the MJS jet grouting reinforcement piles in the width direction of the urban tunnel is 1.4-1.5 m.
And the top of each row of the fender post is provided with a surrounding purlin.
The inner walls of the two sides of the foundation pit are also provided with net-sprayed concrete enclosure walls, and the net-sprayed concrete enclosure walls and the enclosure piles are connected into a whole.
And reinforced concrete supports are arranged between the two rows of enclosing piles, and two ends of each reinforced concrete support are fixedly connected with the two rows of enclosing purlins respectively.
And a plurality of cast-in-situ bored piles are arranged at intervals in the middle of the foundation pit along the extending direction of the urban tunnel, the bottom of each cast-in-situ bored pile is penetrated into the MJS foundation reinforcing layer, and the upper end part of each cast-in-situ bored pile is fixedly connected with the reinforced concrete support.
And a plurality of lattice columns are vertically arranged at the top of the drilled uplift pile, and the other ends of the lattice columns are fixedly connected with the reinforced concrete support.
The utility model has the advantages that: structural design is reasonable, through setting up drilling uplift pile and MJS ground back up coat, can prevent that existing subway tunnel from floating upward, does not influence its normal operation in the work progress, can stay in the underground formation reinforced structure permanently after urban tunnel builds, guarantees its stability and fastness.
Drawings
Fig. 1 is a schematic plan view of the anti-floating construction structure of the present invention;
FIG. 2 is a schematic structural view of the cross section A-A of FIG. 1 according to the present invention;
fig. 3 is a schematic structural view of a section B-B in fig. 1 according to the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example with reference to the accompanying drawings, for the understanding of those skilled in the art:
referring to fig. 1-3, the labels 1-10 in the figures are: the system comprises a subway tunnel 1, an MJS foundation reinforced layer 2, a lateral MJS foundation reinforced layer 2a, a middle MJS foundation reinforced layer 2b, a drilling uplift pile 3, a fender pile 4, a net-sprayed concrete fender wall 5, a drilling cast-in-place pile 6, a foundation pit 7, a fender purlin 8, a reinforced concrete support 9, a concrete bottom plate 10a and a concrete bottom plate 10 b.
Example (b): as shown in fig. 1-3, the embodiment specifically relates to an anti-floating construction structure for an existing subway tunnel spanned on an urban tunnel, and the anti-floating construction structure comprises an MJS foundation reinforcing layer 2 arranged above the subway tunnel 1 and drilling anti-floating piles 3 arranged at two sides of the subway tunnel 1, wherein the drilling anti-floating piles 3 and the MJS foundation reinforcing layer 2 are fixedly connected into a whole to form a door-shaped structure, so that the situation that the subway tunnel 1 floats upwards in the urban tunnel construction process is prevented.
As shown in fig. 1, the subway tunnel 1 is the existing up and down shield subway tunnel, there is the cross region between the city tunnel to be built and the subway tunnel 1, need to stride this section of subway tunnel 1 in the work progress, in the process of excavating this cross region, if direct excavation, then the constraint condition around the segment lining of subway tunnel 1 will change, the segment resistance to deformation ability will significantly reduce under the effect of negative moment, consequently must keep the original atress operating mode of segment lining structure, prevent subway tunnel 1 come-up.
As shown in fig. 1-3, in the present embodiment, a foundation pit 7 is excavated in an area of the urban tunnel that spans the subway tunnel 1 as a prototype of the urban tunnel, lateral MJS foundation reinforcement layers 2a are disposed on both sides of the urban tunnel, a middle MJS foundation reinforcement layer 2b is disposed above the two subway tunnels 1, the lateral MJS foundation reinforcement layers 2a and the middle MJS foundation reinforcement layer 2b jointly form an MJS foundation reinforcement layer 2 having a cross section in a concave shape along the extending direction of the urban tunnel above the subway tunnel 1, and the MJS foundation reinforcement layer 2 is pressed above the subway tunnel 1 to provide pressure for the subway tunnel 1 to prevent the tunnel from floating up. The lateral MJS foundation reinforcing layers 2a positioned on two sides of the urban tunnel are reinforced by MJS full-section, the reinforcing depth is 5.36m below the bottom of the foundation pit 7, the middle MJS foundation reinforcing layer 2b is reinforced by MJS full-section in the same way, and the reinforcing depth is 5.36m from the ground to the bottom of the foundation pit 7; the MJS foundation reinforcing layer 2 is formed by a plurality of MJS jet grouting reinforcing piles, the diameter of the MJS jet grouting reinforcing piles is 2.0m in the embodiment, the arrangement distance in the extending direction of the urban tunnel is 1.6-1.7m, the arrangement distance in the width direction of the urban tunnel is 1.4-1.5m, and the MJS jet grouting reinforcing piles are symmetrically arranged on two sides of the urban tunnel and two sides of the subway tunnel 1, so that the stress balance is ensured. Compared with the common jet grouting pile, the MJS jet grouting reinforcement pile adopted in the embodiment can effectively reduce the soil squeezing effect in the construction process and reduce the deformation of nearby structures and the ground, thereby furthest reducing the influence on the existing subway tunnel 1 and ensuring that the subway tunnel 1 can still normally operate in the urban tunnel construction process.
As shown in fig. 1-3, in order to further ensure the stability of the subway tunnels 1 during the construction of the urban tunnels, a row of drilled uplift piles 3 are respectively arranged on two sides of each subway tunnel 1, the drilled uplift piles 3 are distributed at intervals along the extending direction of the subway tunnel 1, the lower parts of the drilled uplift piles are penetrated into the soil body below the MJS foundation reinforcing layer 2, the upper parts of the drilled uplift piles are penetrated into the MJS foundation reinforcing layer 2 and fixedly connected with the MJS foundation reinforcing layer 2 into a whole, the drilled uplift piles and the drilled uplift piles form a door-shaped structure, and the pressure of the MJS foundation reinforcing layer 2 and the pulling effect of the drilled uplift piles 3 act on the subway tunnel 1 together, so that the.
As shown in fig. 1-3, a row of fender posts 4 are respectively arranged on the inner walls of two sides of a foundation pit 7 parallel to the extending direction of the urban tunnel, the bottom of each fender post 4 is fixedly connected with an MJS reinforcing layer 2 into a whole, and a purlin 8 is arranged on the top of each row of fender posts 4 to connect the fender posts 4 into a whole, so that the structural strength is enhanced, and meanwhile, a net-sprayed concrete fender wall 5 is constructed at the position of each row of fender posts 4, so that the fender posts 4 and the net-sprayed concrete fender walls 5 form an integrated structure, thereby forming a powerful support for the soil mass on two sides of the foundation pit 7 and preventing the soil mass from collapsing. In order to further enhance the stability of the enclosure structure of the foundation pit 7, reinforced concrete supports 9 are further arranged between the two sides of the net-sprayed concrete enclosure walls 5 at intervals, a plurality of cast-in-situ bored piles 6 are further arranged in the middle of the foundation pit 7 along the extending direction of the urban tunnel, the bottom of each cast-in-situ bored pile 6 is penetrated into the soil body below the MJS foundation reinforcement layer 2, the upper parts of the cast-in-situ bored piles are supported on the reinforced concrete supports 9, and certainly, in order to save the engineering quantity, the cast-in-situ bored piles 6 are not additionally arranged, a plurality of lattice columns are directly and vertically arranged at the tops of the uplift piles 3, so that the bottom ends of the lattice columns are fixedly connected with the uplift piles 3, and the upper.
As shown in fig. 2-3, two concrete bottom plates, namely a concrete bottom plate 10a and a concrete bottom plate 10b, are arranged above the middle MJS foundation reinforcement layer 2b, i.e., at the bottom of the foundation pit 7, so as to ensure the integrity and the waterproof performance of the bottom plates. The drilling uplift pile 3, the fender pile 4 and the drilling cast-in-place pile 6 are poured into a whole with the concrete bottom plate 10a and the concrete bottom plate 10b, and the structural performance is ensured.
As shown in fig. 1 to 3, a specific construction process of the anti-floating construction structure across the existing subway tunnel on the urban tunnel in the embodiment includes the following steps:
(1) constructing a row of drilled uplift piles 3 on each of two sides of each subway tunnel 1, enabling the depth of the bottoms of the drilled uplift piles 3 to be larger than that of the bottoms of the subway tunnels 1, and arranging latticed columns at the tops of the drilled uplift piles 3;
(2) constructing MJS foundation reinforcement layers 2 above the subway tunnel 1 and on two sides of the designed urban tunnel, constructing a lateral MJS foundation reinforcement layer 2a, and then constructing a middle MJS foundation reinforcement layer 2b, wherein the MJS jet grouting reinforcement pile construction is mainly completed by the following steps: a. accurately determining the pile position; b. drilling holes by a drilling machine; c, positioning a machine in the MJS construction method and placing a grouting pipe; d. checking each construction parameter; e. lifting the grouting pipe in sections; f, cleaning and shifting to the next pile position; it should be noted that high-pressure operation around the segment of the subway tunnel 1 should be avoided as much as possible in the construction process of the MJS foundation reinforcement layer 2;
(3) constructing a row of fender piles 4 on two sides of a designed foundation pit 7, constructing a purlin 8 on the top of each row of fender piles 4, constructing a net-sprayed concrete fender wall 5 at the position of each row of fender piles 4, and constructing a reinforced concrete support 9 to support the lattice column on the reinforced concrete support 9;
(4) precipitation is symmetrically carried out on two sides of the subway tunnel 1, and the underground water level is strictly controlled; the first layer soil of excavation foundation ditch 7 after accomplishing the precipitation, guarantee that subway tunnel 1 upper portion earthing thickness is not less than 6m, then the second layer soil of excavation foundation ditch 7, the second layer soil adopts the symmetry excavation of piecemeal, pours concrete bottom plate immediately after the soil block excavation of every group symmetry to with drilling uplift pile 3 be connected into overall structure, prevent the section of jurisdiction lining structure come-up of subway tunnel 1.
The beneficial effect of this embodiment is: structural design is reasonable, through setting up drilling uplift pile and MJS ground back up coat, can prevent that existing subway tunnel from floating upward, does not influence its normal operation in the work progress, can stay in the underground formation reinforced structure permanently after urban tunnel builds, guarantees its stability and fastness.
Claims (10)
1. An anti-floating construction structure for crossing an existing subway tunnel on the urban tunnel, wherein a foundation pit of the urban tunnel is excavated in an area above the existing subway tunnel, and is characterized in that the anti-floating construction structure comprises an MJS foundation reinforcing layer arranged between the subway tunnel and the foundation pit and drilling uplift piles arranged on two sides of each subway tunnel along the extension direction of the foundation pit, wherein the MJS foundation reinforcing layer and the drilling uplift piles are connected into a whole; the inner walls of two sides of the foundation pit are respectively provided with a row of fender piles, two layers of concrete bottom plates are arranged above the MJS foundation reinforcing layer, and the concrete bottom plates, the drilled uplift piles and the fender piles are connected into a whole.
2. The anti-floating construction structure of the urban tunnel across the existing subway tunnel according to claim 1, wherein the cross section of said MJS foundation reinforcement layer along the width direction of said urban tunnel is in a shape of Chinese character 'ao'.
3. The anti-uplift construction structure of the urban tunnel across the existing subway tunnel according to claim 1, wherein the MJS foundation reinforcement layer comprises a plurality of MJS jet grouting reinforcement piles, and the MJS jet grouting reinforcement piles are arranged in a soil body above the subway tunnel at intervals.
4. The upward floating resisting construction structure of the urban tunnel over the existing subway tunnel according to claim 3, wherein the MJS jet grouting reinforcement pile has a pile diameter of 2 m.
5. The upward floating resisting construction structure of the urban tunnel across the existing subway tunnel according to claim 3, wherein the arrangement pitch of the MJS jet grouting reinforcement piles in the extending direction of the urban tunnel is 1.6-1.7m, and the arrangement pitch in the width direction of the urban tunnel is 1.4-1.5 m.
6. The upward floating resisting construction structure of the urban tunnel over the existing subway tunnel according to claim 1, wherein a surrounding purlin is arranged at the top of each row of the surrounding piles.
7. The upward floating resisting construction structure of the urban tunnel over the existing subway tunnel according to claim 1, wherein the inner walls of both sides of the foundation pit are further provided with a net-sprayed concrete enclosure wall, and the net-sprayed concrete enclosure wall and the enclosure pile are connected into a whole.
8. The upward floating resisting construction structure of the urban tunnel over the existing subway tunnel according to claim 6, wherein a reinforced concrete support is arranged between the two rows of fender piles, and two ends of the reinforced concrete support are respectively and fixedly connected with the two rows of surrounding purlins.
9. The upward floating resisting construction structure of the urban tunnel across the existing subway tunnel according to claim 8, wherein a plurality of cast-in-situ bored piles are arranged in the middle of the foundation pit at intervals along the extending direction of the urban tunnel, the bottom of each cast-in-situ bored pile penetrates into the MJS foundation reinforcement layer, and the upper end of each cast-in-situ bored pile is fixedly connected with the reinforced concrete support.
10. The upward floating resisting construction structure of the urban tunnel across the existing subway tunnel according to claim 8, wherein a plurality of lattice columns are vertically arranged on the top of the drilled uplift pile, and the other ends of the lattice columns are fixedly connected with the reinforced concrete supports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821698101.0U CN209924997U (en) | 2018-10-19 | 2018-10-19 | Anti-floating construction structure for crossing existing subway tunnel on urban tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821698101.0U CN209924997U (en) | 2018-10-19 | 2018-10-19 | Anti-floating construction structure for crossing existing subway tunnel on urban tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209924997U true CN209924997U (en) | 2020-01-10 |
Family
ID=69064220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821698101.0U Active CN209924997U (en) | 2018-10-19 | 2018-10-19 | Anti-floating construction structure for crossing existing subway tunnel on urban tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209924997U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113565525A (en) * | 2021-08-28 | 2021-10-29 | 中铁上海工程局集团有限公司 | Construction protection system and construction method for newly-built shield tunnel super-close ultra-shallow buried upper-span existing tunnel |
| CN114086562A (en) * | 2021-11-27 | 2022-02-25 | 哈尔滨工业大学 | Foundation pit construction method for advanced reinforcement right above subway tunnel operated in high and cold region |
| CN114319164A (en) * | 2021-12-21 | 2022-04-12 | 广州市市政工程设计研究总院有限公司 | Open-cut tunnel upper-span existing culvert structure and construction method thereof |
| CN114457849A (en) * | 2022-03-03 | 2022-05-10 | 浙江交工集团股份有限公司 | Construction method for crossing existing subway cross section protection system on open trench tunnel |
-
2018
- 2018-10-19 CN CN201821698101.0U patent/CN209924997U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113565525A (en) * | 2021-08-28 | 2021-10-29 | 中铁上海工程局集团有限公司 | Construction protection system and construction method for newly-built shield tunnel super-close ultra-shallow buried upper-span existing tunnel |
| CN114086562A (en) * | 2021-11-27 | 2022-02-25 | 哈尔滨工业大学 | Foundation pit construction method for advanced reinforcement right above subway tunnel operated in high and cold region |
| CN114319164A (en) * | 2021-12-21 | 2022-04-12 | 广州市市政工程设计研究总院有限公司 | Open-cut tunnel upper-span existing culvert structure and construction method thereof |
| CN114457849A (en) * | 2022-03-03 | 2022-05-10 | 浙江交工集团股份有限公司 | Construction method for crossing existing subway cross section protection system on open trench tunnel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107119711B (en) | Connecting structure for large-range adjacent existing transfer station and construction method | |
| CN209924997U (en) | Anti-floating construction structure for crossing existing subway tunnel on urban tunnel | |
| CN108589771B (en) | Construction method for layer-adding transfer node of operated underground station | |
| CN210529712U (en) | Construction structure for foundation pit crossing underground pipeline area | |
| CN211340800U (en) | Super dark foundation ditch earthwork excavation platform structure | |
| CN114457850B (en) | Construction method for crossing existing subway cross section anti-floating system on open cut tunnel | |
| CN102410031A (en) | Underground space structure constructed by pile wall construction method | |
| CN1333139C (en) | Column supported underground continuous wall | |
| CN208918547U (en) | Across the city tunnel structure of existing subway tunnel on a kind of | |
| CN217974413U (en) | Deep and shallow foundation pit supporting construction structure | |
| CN110847188A (en) | Ultra-deep foundation pit earth excavation platform structure and construction method thereof | |
| CN110952563A (en) | Temporary anti-floating structure for excavation of foundation pit above existing subway tunnel | |
| CN115977165A (en) | Reinforced structure of shield tunnel closely through building | |
| CN110805049A (en) | Construction method of mountain slope ultra-thickness spray anchor permanent supporting structure | |
| CN217053493U (en) | Anti-floating system for crossing section of existing subway on open-cut tunnel | |
| CN216405155U (en) | Box culvert construction is with template board of being convenient for pour | |
| CN213625676U (en) | Combined anti-scour beach fan foundation | |
| CN113737857A (en) | Be used for deep pipe gallery structure and major structure to build connection structure again and worker's method thereof | |
| CN107313454A (en) | A kind of construction method of underground garage | |
| CN112177016A (en) | Composite steel pipe pile foundation pit supporting structure and construction method thereof | |
| CN214169077U (en) | Composite steel pipe pile foundation pit supporting structure | |
| CN216275713U (en) | Foundation pit supporting structure for crossing important building structures below | |
| CN220791240U (en) | Subway tunnel top excavation supporting construction | |
| CN205063369U (en) | Quick transport corridor of super deep basal pit spiral decline material | |
| CN115198787B (en) | Steel tube column type tower crane foundation and construction method thereof, and cover-excavation reverse construction method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |