CN107401176A - A kind of bridge bearing platform foundation pit structure for excavating protection subway - Google Patents
A kind of bridge bearing platform foundation pit structure for excavating protection subway Download PDFInfo
- Publication number
- CN107401176A CN107401176A CN201710624873.3A CN201710624873A CN107401176A CN 107401176 A CN107401176 A CN 107401176A CN 201710624873 A CN201710624873 A CN 201710624873A CN 107401176 A CN107401176 A CN 107401176A
- Authority
- CN
- China
- Prior art keywords
- small
- foundation
- subway
- cushion cap
- foundation ditch
- 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
- 239000004567 concrete Substances 0.000 claims abstract description 17
- 238000009412 basement excavation Methods 0.000 claims abstract description 14
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 239000010959 steel Substances 0.000 claims description 25
- 239000011378 shotcrete Substances 0.000 claims description 15
- 238000007569 slipcasting Methods 0.000 claims description 8
- 229920002472 Starch Polymers 0.000 claims 1
- 235000019698 starch Nutrition 0.000 claims 1
- 239000008107 starch Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
-
- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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
The present invention relates to a kind of cushion cap foundation pit structure for excavating protection subway, cushion cap foundation ditch is divided into several small foundation ditches, several described small foundation ditches comprise at least the small foundation ditch of a row being arranged on directly over subway and the two small foundation ditches of row positioned at subway both sides, wherein pile foundation of bearing platform is arranged in the small foundation ditch of subway both sides, corresponding piecemeal cushion cap concrete is poured into a mould after each small excavation of foundation pit, the edge of each small foundation ditch reserves certain distance between cushion cap, after each small pattern foundation pit supporting structure is abolished, the reinforcing bar of each piecemeal cushion cap pours into a mould expansive concrete and treats that intensity reaches design requirement after being attached, apply prestressing force and nine small cushion caps are formed into overall suspended deck structure, so as to form overall cushion cap stress system.Existing subway be present suitable for bridge bearing platform foundation ditch bottom and need to protect subway in the present invention.
Description
Technical field
The present invention relates to protection subway scheme, and in particular to a kind of bridge bearing platform foundation pit structure for excavating protection subway, fits
Existing subway be present for bridge bearing platform foundation ditch bottom and need situation to be protected.
Background technology
The overall mileage of urban rail transit in China is in rapid growth, and at some in the process of construction of Urban Bridge engineering
In the case of will have no alternative but existing subway top carry out cushion cap foundation ditch excavation, because the macroscopic destruction of cushion cap foundation ditch is often led to
There is the phenomenon integrally to float in existing structure of the subway, so as to have influence on the normal operation of subway safety.Intend proposing for this present invention
A kind of bridge bearing platform excavation of foundation pit protects subway technical scheme, plans due to unfavorable to existing subway caused by cushion cap excavation of foundation pit
Influence reduce, so as to ensure the normal operation of subway.
The content of the invention
It is on existing subway it is an object of the invention to propose a kind of bridge bearing platform foundation pit structure for excavating protection subway
The excavation of bridge bearing platform foundation ditch provides strong technical support.
To achieve the above object, technical scheme is characterised by：A kind of bridge bearing platform base for excavating protection subway
Cheat structure, it is characterised in that cushion cap foundation ditch is divided into several small foundation ditches, and several described small foundation ditches comprise at least and are arranged on subway
The small foundation ditch of a row of surface and the two small foundation ditches of row positioned at subway both sides, arrangement is held wherein in the small foundation ditch of subway both sides
Platform pile foundation, pours into a mould corresponding piecemeal cushion cap concrete after each small excavation of foundation pit, the edge of each small foundation ditch with piecemeal cushion cap
Certain distance is reserved between concrete, after each small pattern foundation pit supporting structure is abolished, the reinforcing bar of each piecemeal cushion cap is poured into a mould after being attached and mended
Repay shrinkage concrete and treat that intensity reaches design requirement, apply prestressing force and nine small cushion caps are formed into overall suspended deck structure, so as to
Form overall cushion cap stress system.
Preferably, several described small foundation ditches use gunite concrete+anchor pole+reinforced mesh+bracing members or steel grating
Combined bolting and shotcrete protected.
Preferably, fore shaft circle is set at the top of small foundation ditch, while in order to ensure fore shaft circle and supporting entirety stress, in fore shaft
Circle sets dowel with combined bolting and shotcrete.
Preferably, to ensure safety of the small foundation ditch in excavation, Bracing Process, there is provided slip casting steel floral tube to be propped up in advance
Shield, and slip casting steel floral tube is fixed in fore shaft circle.
Preferably, cushion cap foundation ditch is divided into 3 rows 3 and arranges totally 9 small foundation ditches.
Preferably, the support of steel gusset is respectively provided with all small foundation ditches.
The present invention proposes a kind of bridge bearing platform foundation pit structure for excavating protection subway, by the way that bridge bearing platform foundation ditch is divided into
Several small foundation ditches, corresponding piecemeal cushion cap concrete each is poured into a mould after small excavation of foundation pit, each piecemeal cushion cap is connected into whole
The form of body will be due to reducing, so as to ensure the normal fortune of subway caused by cushion cap excavation of foundation pit to existing subway detrimental effect
Battalion.
Brief description of the drawings
Fig. 1 bridge bearing platform foundation ditch sectional plans.
Fig. 2 is A-A profiles shown in Fig. 1.
Fig. 3 is that fore shaft circle is connected drawing with supporting.
Fig. 4 is B-B profiles shown in Fig. 3.
Fig. 5 is shaft support full-page proof.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Figure includes：Subway 1, pile foundation of bearing platform 2, steel gusset support 3, shaft support 4, fore shaft circle 5, slip casting steel floral tube 6, steel change
Support 7, concrete force transmission element 8, cushion cap 9, pea gravel concreten bed course 10, dowel 11, double layer bar 12, bracing members or steel grating
13rd, reinforcing bar 14 is connected.
As depicted in figs. 1 and 2, bridge bearing platform foundation ditch is divided into I ~ Ⅸ area, totally nine subregions, that is, nine small foundation ditches, and
Bridge entirety cushion cap is also resolved into corresponding nine pieces of small cushion caps by each small foundation ditch, wherein Ith area, IVth area, VIIth area are located at subway
Side, IIth area, Vth area, VIIIth area are located at the opposite side of subway, and IIIth area, VIth area, Ⅸth area are located at the surface of subway.Described each point
Shaft support 4 is set around area, and the shaft support 4 is using gunite concrete+anchor pole+reinforced mesh+bracing members or steel
The combined bolting and shotcrete of grid.Fore shaft circle 5 is set at the top of small foundation ditch, I ~ Ⅸ area is provided with slip casting steel floral tube and carries out advance support, and
Slip casting steel floral tube 6 is fixed in fore shaft circle 5.Steel support replacement 7 and concrete force transmission element 8 are also set up on the inside of shaft support.Foundation ditch
Bottom sets pea gravel concreten bed course 10, and cushion cap 9 is arranged on pea gravel concreten bed course 10.
Each partitions sizes a, b can be according to field engineering geology and correlation computations determination, gunite concrete thickness c, steel branch
Support or steel grating model, double layer bar specification determine according to field engineering geology and correlation computations, excavate cyclic advance d every time
Determined according to field engineering geology and correlation computations.
As shown in Figure 3 and Figure 4, fore shaft circle 5 is set at the top of small foundation ditch, dowel is set in fore shaft circle 5 and combined bolting and shotcrete 4
11, the dowel 11 uses Φ 20 dowel, and 0.4 ~ 0.6m of ring spacing of adjacent dowel.
As shown in figure 5, shaft support 4 includes double layer bar 12, at least twice between the double steel bar 12
Bracing members or steel grating 13, adjacent bracing members or steel grating support also set up connection reinforcing bar 14, the ring of the connection reinforcing bar 14
It is 1m to spacing.
A kind of bridge bearing platform foundation ditch construction method of excavation protection subway of the present invention, it is characterised in that the construction method
Including following characteristics：
First, a range of soil body in the existing periphery of subway 1 carries out foundation stabilization；
2nd, bridge bearing platform foundation ditch is divided into several small foundation ditches, general to comprise at least the small foundation ditch of row being arranged on directly over subway
And the two small foundation ditches of row positioned at subway both sides, according to the present embodiment, the bridge bearing platform foundation ditch is divided into I ~ Ⅸ area, nine totally points
Area（Each partitions sizes a, b can determine according to field engineering geology and correlation computations）, and each small foundation ditch integrally holds bridge
Platform also resolves into corresponding nine pieces of small cushion caps, then carries out Support of Foundation Pit Excavation successively according to the order in I ~ Ⅸ area in figure, so
The cushion cap in each area is poured into a mould afterwards；
3rd, in order to reduce because excavation of foundation pit causes existing subway to float, in the small foundation ditch positioned at subway both sides（As shown in FIG.
Ith area, IIth area, IVth area, Vth area, VIIth area, VIIIth area totally six subregions）Arrange pile foundation of bearing platform 2 so that pile foundation of bearing platform 2 not only by
Vertical pressure is produced to support superstructure load action, and can play by pit accident and caused vertically pull out
Power；
4th, the small foundation ditch directly over existing subway is considered（IIIth area, VIth area, Ⅸth area as illustrated in the drawing）Due to not arranging pile foundation and
There may be the adverse effect of pit accident, the piecemeal cushion cap of the small foundation ditch scope in IIIth area, VIth area, Ⅸth area directly over subway pours
Note and reach timely ballast after intensity, prevent bottom heave；
5th, totally nine small foundation ditches of cushion cap are respectively provided with shaft support 4 in I ~ Ⅸ area, and the shaft support 4 is using gunite concrete+anchor
The combined bolting and shotcrete of bar+reinforced mesh+bracing members or steel grating（Gunite concrete thickness c, bracing members or steel grating model, bilayer
Bar-mat reinforcement specification determines according to field engineering geology and correlation computations）Protected, excavate cyclic advance d every time according to live work
Journey geology and correlation computations determine；
6th, in order to ensure safety of I ~ Ⅸ area in totally nine small Excavation Process, fore shaft circle 5 is set at the top of small foundation ditch, together
When in order to ensure fore shaft circle and supporting entirety stress, dowel 11 is set in fore shaft circle 5 and combined bolting and shotcrete, the dowel 11 is adopted
With Φ 20 dowel, and 0.4 ~ 0.6m of ring spacing of adjacent dowel；
7th, in order to reduce the stress of combined bolting and shotcrete, it is provided with slip casting steel floral tube in I ~ Ⅸ area and carries out advance support, and by slip casting steel
Floral tube 6 is fixed in fore shaft circle 5；
8th, in view of by the connection of totally nine cushion caps is integral in I ~ Ⅸ area, beneficial to overall stress, being reserved between small foundation ditch and cushion cap
Certain distance, after each small pattern foundation pit supporting structure is abolished, the reinforcing bar of each piecemeal cushion cap pours into a mould expansive concrete simultaneously after being attached
Treat that intensity reaches design requirement, applying prestressing force, totally nine small cushion caps form overall suspended deck structure by I ~ Ⅸ area, whole so as to be formed
Body cushion cap stress system.
Claims (5)
- A kind of 1. bridge bearing platform foundation pit structure for excavating protection subway, it is characterised in that cushion cap foundation ditch is divided into several small foundation ditches, Several described small foundation ditches comprise at least the small foundation ditch of a row being arranged on directly over subway and arranged positioned at the two of subway both sides small Pile foundation of bearing platform is arranged in the small foundation ditch of foundation ditch, wherein subway both sides, corresponding piecemeal cushion cap is poured into a mould after each small excavation of foundation pit Concrete, the edge of each small foundation ditch reserve certain distance between cushion cap, and after each small pattern foundation pit supporting structure is abolished, each piecemeal is held The reinforcing bar of platform pours into a mould expansive concrete after being attached and treats that intensity reaches design requirement, applies prestressing force and is held nine small Platform forms overall suspended deck structure, so as to form overall cushion cap stress system.
- 2. the as claimed in claim 1 bridge bearing platform foundation pit structure for excavating protection subway, it is characterised in that described several are small Foundation ditch is protected using the combined bolting and shotcrete of gunite concrete+anchor pole+reinforced mesh+bracing members or steel grating.
- 3. the bridge bearing platform foundation pit structure as claimed in claim 1 for excavating protection subway, it is characterised in that at the top of small foundation ditch Fore shaft circle is set, while in order to ensure fore shaft circle and supporting entirety stress, dowel is set in fore shaft circle and combined bolting and shotcrete.
- 4. the bridge bearing platform foundation pit structure as claimed in claim 3 for excavating protection subway, it is characterised in that small foundation ditch sets note Starch steel floral tube and carry out advance support, and slip casting steel floral tube is fixed in fore shaft circle.
- 5. the bridge bearing platform foundation pit structure as claimed in claim 1 for excavating protection subway, it is characterised in that in all small foundation ditches It is respectively provided with the support of steel gusset.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624873.3A CN107401176A (en) | 2017-07-27 | 2017-07-27 | A kind of bridge bearing platform foundation pit structure for excavating protection subway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624873.3A CN107401176A (en) | 2017-07-27 | 2017-07-27 | A kind of bridge bearing platform foundation pit structure for excavating protection subway |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107401176A true CN107401176A (en) | 2017-11-28 |
Family
ID=60401613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710624873.3A Pending CN107401176A (en) | 2017-07-27 | 2017-07-27 | A kind of bridge bearing platform foundation pit structure for excavating protection subway |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107401176A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101200897A (en) * | 2007-11-20 | 2008-06-18 | 中铁大桥局集团第二工程有限公司 | Construction method for grouting curtain combined with steel reinforced concrete guard ring |
| CN101550698A (en) * | 2009-05-05 | 2009-10-07 | 上海隧道工程股份有限公司 | Constructing method for basic pit at the upper part of shield tunnel |
| CN103321230A (en) * | 2013-07-12 | 2013-09-25 | 上海隧道工程股份有限公司 | Excavation method for deep and big foundation pit in long-distance crossing field for shallow-buried subway |
| CN204827454U (en) * | 2015-06-02 | 2015-12-02 | 青岛城建集团有限公司 | Subway construction engineering construction shaft |
| CN205907692U (en) * | 2016-08-08 | 2017-01-25 | 中国十九冶集团有限公司 | A reinforced concrete arch ring structure that is used for bridge main pier bearing platform foundation ditch on basement rock of river course abrupt slope |
| CN106869147A (en) * | 2017-03-10 | 2017-06-20 | 山东科技大学 | One kind is in marine site ultra-deep without support fore shaft collar tie beam |
-
2017
- 2017-07-27 CN CN201710624873.3A patent/CN107401176A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101200897A (en) * | 2007-11-20 | 2008-06-18 | 中铁大桥局集团第二工程有限公司 | Construction method for grouting curtain combined with steel reinforced concrete guard ring |
| CN101550698A (en) * | 2009-05-05 | 2009-10-07 | 上海隧道工程股份有限公司 | Constructing method for basic pit at the upper part of shield tunnel |
| CN103321230A (en) * | 2013-07-12 | 2013-09-25 | 上海隧道工程股份有限公司 | Excavation method for deep and big foundation pit in long-distance crossing field for shallow-buried subway |
| CN204827454U (en) * | 2015-06-02 | 2015-12-02 | 青岛城建集团有限公司 | Subway construction engineering construction shaft |
| CN205907692U (en) * | 2016-08-08 | 2017-01-25 | 中国十九冶集团有限公司 | A reinforced concrete arch ring structure that is used for bridge main pier bearing platform foundation ditch on basement rock of river course abrupt slope |
| CN106869147A (en) * | 2017-03-10 | 2017-06-20 | 山东科技大学 | One kind is in marine site ultra-deep without support fore shaft collar tie beam |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106758841B (en) | A kind of whole construction process of the double rope face low-pylon cable-stayed bridges of double tower | |
| CN107119711B (en) | Connecting structure for large-range adjacent existing transfer station and construction method | |
| CN107604924A (en) | A kind of construction method of bridge bearing platform excavation of foundation pit protection subway | |
| CN102226398A (en) | Soft rock four-line large-span tunnel compound double-side wall bracing cable conversion excavation construction method | |
| CN107218046A (en) | Mechanical assistance sealing Station structure and construction method in a kind of pilot tunnel | |
| CN101914897A (en) | Construction method of single main cable inclined-suspender earth anchored suspension bridge | |
| CN210598987U (en) | Subway station based on single-layer four-guide-hole and middle-guide-hole inner pile foundation | |
| CN206844120U (en) | It is a kind of be adapted to adjacent foundation pits supporting to draw anchor cable structure | |
| CN103184722B (en) | Large-span double-layer Bailey truss structure and construction method thereof | |
| CN106012872B (en) | Continuous rigid frame bridge without dorsal funciculus oblique pull reinforcement system and construction method | |
| CN207063982U (en) | Mechanical assistance sealing Station structure in a kind of pilot tunnel | |
| CN102031785A (en) | Foundation pit supporting technique for replacing temporary enclosing purlin by using plate belt of permanent structure | |
| CN110486034A (en) | Subway station and construction method based on pile foundation in four pilot tunnel of single layer and middle drift | |
| CN104294769A (en) | Built abutment structure reinforced through combination of pile supplementing and abutment cap enlarging and construction method | |
| CN110159323B (en) | Construction method suitable for extra-large section underground chamber excavation and steel arch frame fixing | |
| CN105862610A (en) | Offset correction structure and method for urban rail transit viaduct structure in soft soil area | |
| CN102953385A (en) | Construction method for changing support of foundation pit at irregular place of rampway | |
| CN103334778A (en) | Construction technology of step temporary support and partial double side walls | |
| CN112922646B (en) | Building method of underground excavation station excavated by large-section single-span support through superposed arch-wall integrated type | |
| CN105386779A (en) | Arch column method for building large-scale underground structure in shallow buried rock stratums | |
| CN110159312B (en) | Method for repairing straight wall circular arch tunnel lining | |
| CN107237342A (en) | New low pile cap foundation structure and its construction method | |
| CN207228142U (en) | A kind of bridge bearing platform foundation pit structure | |
| CN107401176A (en) | A kind of bridge bearing platform foundation pit structure for excavating protection subway | |
| CN214787427U (en) | Tunnel arch bridge type tunnel bottom structure |
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 |