CN108049418A - Underground parking controls construction method with the Resistant heave of ultra-deep open caisson - Google Patents
Underground parking controls construction method with the Resistant heave of ultra-deep open caisson Download PDFInfo
- Publication number
- CN108049418A CN108049418A CN201711106737.1A CN201711106737A CN108049418A CN 108049418 A CN108049418 A CN 108049418A CN 201711106737 A CN201711106737 A CN 201711106737A CN 108049418 A CN108049418 A CN 108049418A
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- Prior art keywords
- open caisson
- ultra
- hole bottom
- construction method
- deep
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
-
- 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
- E02D17/18—Making embankments, e.g. dikes, dams
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention relates to a kind of underground parking Resistant heaves of ultra-deep open caisson to control construction method, solves ultra-deep parking well Foundation Pit bottom rebound in the prior art, hole bottom uplift of soil is unstable, be easy to cause the defects of foundation pit structure destroys, includes the following steps：（1）Open caisson construction is carried out using caisson sinking construction method, until open caisson makes a reservation for cheat bottom；（2）Then continue to excavate enough depth downwards from reservation hole bottom；（3）Then backfilled since actual pit bottom, be backfilling into predetermined hole bottom；（4）Back cover construction is carried out to predetermined hole bottom.Predetermined hole bottom back cover and does not continue lower dig and increases cutting depth, is backfilled on actual pit bottom, passes through and backfill dead weight, make hole subsoil body stress balance, back cover finally is carried out to predetermined hole bottom again, reduces construction risk, it avoids hole bottom to dash forward phenomena such as gushing, ensures ultra-deep parking well foundation pit structure stability.
Description
Technical field
The present invention relates to a kind of construction method of open caisson, especially a kind of underground parking is controlled with the Resistant heave of ultra-deep open caisson
Construction method.
Background technology
To solve the problems, such as city " parking difficulty ", ultra-deep parking well construction is just progressively risen, and work progress relates generally to stake
Wall supporting and retaining system is excavated and structure underground sinks two ways.If the well foundation depth that stops is very big, such as more than 25m, structure underground sinks
The security and technical advantage of mode become apparent from, even if running into deep weak soil geological conditions, muddy water inside and outside well can also be used and put down
The modes such as weighing apparatus construction ensure that open caisson sinks safely.
Existing open caisson construction technique is used in pithead position, prefabricated caisson cutting edge and one section of borehole wall, then in the borehole wall
Going along with sb. to guard him under by constantly cutting the earth out of well, open caisson is made gradually to sink under Gravitative Loads, when well sinking in place after sunk
Well back cover.
Ultra-deep parking well foundation pit area is small, but excavate it is very deep, it is square directly proportional due to earth lateral pressure and cutting depth
Relation, with cutting depth inversely, the hole bottom for the well foundation pit that stops and caisson retaining wall will for Foundation Pit bottom Resistant heave safety coefficient
Bear very big soil pressure.Well sinking in place, removes all support systems, and before carrying out back cover, Foundation Pit bottom is in most endangering
Dangerous state, extremely unstable, hole bottom stability against heave cannot be guaranteed, if directly soil body rebound most probably occurs for back cover, destroy foundation pit
Bottom plate, in the presence of having artesian water when underground, it may occur that the soil body, which is dashed forward, the accidents such as gushes.
The content of the invention
The present invention solves ultra-deep parking well Foundation Pit bottom rebound in the prior art, and hole bottom uplift of soil is unstable, easily
The defects of foundation pit structure is caused to destroy, provides a kind of Resistant heave control construction method of underground parking ultra-deep open caisson, and increase is opened
The depth of digging, the position below predetermined hole bottom are backfilled, by dead weight, balance bottom heave, foundation pit structure is avoided to be broken
It is bad.
The technical solution adopted by the present invention to solve the technical problems is：A kind of Resistant heave of underground parking ultra-deep open caisson
Construction method is controlled, is included the following steps：(1) open caisson construction is carried out using caisson sinking construction method, until open caisson makes a reservation for cheat
Bottom；(2) then continue to excavate enough depth downwards from reservation hole bottom；(3) then backfill, be backfilling into predetermined since actual pit bottom
Cheat bottom；(4) back cover construction is carried out to predetermined hole bottom.Predetermined hole bottom back cover and does not continue lower dig and increases cutting depth, in actual pit
It is backfilled on bottom, is conducted oneself with dignity by backfilling, make hole subsoil body stress balance, back cover finally is carried out to predetermined hole bottom again, reduces construction
Risk avoids hole bottom and dashes forward phenomena such as gushing, and ensures ultra-deep parking well foundation pit structure stability.
Preferably, the open caisson cutting depth below predetermined hole bottom is calculated according to engineering geological condition, calculation
Foundation pit Resistant heave is taken to check modeIn formula：H- is determined by parking well floor level requirement
Excavation of foundation pit depth (m)；D- is by the present invention claims increased cutting depths (m)；γ1、γ2- it is respectively open caisson wall outside and hole bottom
Soil body severe (kN/m3)；Q- overcharge on ground (kPa)；Nc, Nq- factor of soil bearing capacity, Ks- Resistant heave safety coefficients.
Preferably, using Prandtl calculation formula, wherein Nc, Nq is respectively：WithSafety coefficient requires Ks≤1.10-1.20, calculates
Ks=1.20 is taken during d minimum values.
Preferably, using Terzaghi calculation formula, Nc, Nq are respectively：WithSafety coefficient requires Ks≤1.15-1.25, and Ks=1.25 is taken when calculating d minimum values.
Either clay or concrete preferably, backfill use is banketed.
The beneficial effects of the invention are as follows：Predetermined hole bottom back cover and does not continue lower dig and increases cutting depth, actual pit bottom it
Upper backfill is conducted oneself with dignity by backfilling, makes hole subsoil body stress balance, is finally carried out back cover to predetermined hole bottom again, is reduced construction risk,
It avoids hole bottom to dash forward phenomena such as gushing, ensures ultra-deep parking well foundation pit structure stability.
Description of the drawings
Fig. 1 is a kind of structure diagram of the present invention；
In figure：1st, open caisson wall, 2, backfill, 3, predetermined hole bottom, 4, ground elevation, 5, actual pit bottom, the increased cutting depths of d, h bases
Cheat cutting depth, γ2Cheat subsoil weight degree, γ1Soil body severe on the outside of open caisson wall, q overcharge on ground.
Specific embodiment
Below by specific embodiment, and with reference to attached drawing, the technical solutions of the present invention will be further described.
Embodiment：A kind of underground parking controls construction method with the Resistant heave of ultra-deep open caisson, includes the following steps：
(1) the predetermined open caisson cutting depth cheated below bottom is calculated according to engineering geological condition, calculation takes foundation pit Resistant heave
Checking computations modeIn formula：H- is by the definite excavation of foundation pit depth of parking well floor level requirement
(m)；D- is by the present invention claims increased cutting depths (m)；γ1、γ2- be respectively open caisson wall on the outside of and hole bottom soil body severe
(kN/m3)；Q- overcharge on ground (kPa)；Nc, Nq- factor of soil bearing capacity, Ks- Resistant heave safety coefficients.
(2) open caisson construction is carried out using caisson sinking construction method, from ground elevation 4 until open caisson makes a reservation for cheat bottom 3；
(3) then continue to excavate enough depth d downwards from reservation hole bottom, and form open caisson wall 1；
(4) the then backfill 2 since actual pit bottom 5 is backfilling into predetermined hole bottom 3；
(5) back cover construction is carried out to predetermined hole bottom.
The present embodiment is constructed for 30m ultra-deep underground parking wells foundation pit open caisson, and address situation see the table below：
| Sequence number | Foundation soil type | Thickness | Severe |
| Ⅰ | It bankets | 3.0m | 17.5 |
| Ⅱ | Silty clay | 6.90m | 17.8 |
| Ⅲ | Very soft sill clay | 17.20m | 17.3 |
| Ⅳ | Silty clay | 8.0m | 18.4 |
| Ⅴ | Circle gravel | 2.70m | 20.5 |
Wherein overcharge on ground q is 30kPa, and the backfill parameter used is severe γ2For 21kN/m3, cohesive strength c=18kPa is interior
Angle of friction φ=25 °.Nc, Nq are calculated using Prandtl formula：
Bring Resistant heave safety coefficient formula, K intoSTake the safety coefficient upper limit 1.2：
Obtain d=1.46m, it is known that construction rank
Section should excavate minimum 1.46m more.
Embodiment described above is a kind of preferred version of the present invention, not makees limit in any form to the present invention
System also has other variants and remodeling on the premise of without departing from the technical solution recorded in claim.
Claims (5)
1. a kind of underground parking controls construction method with the Resistant heave of ultra-deep open caisson, it is characterised in that includes the following steps：(1) adopt
Open caisson construction is carried out with caisson sinking construction method, until open caisson makes a reservation for cheat bottom；(2) then from subscribing, the continuation of hole bottom is downward to excavate
Enough depth；(3) then backfilled since actual pit bottom, be backfilling into predetermined hole bottom；(4) back cover construction is carried out to predetermined hole bottom.
2. underground parking according to claim 1 controls construction method with the Resistant heave of ultra-deep open caisson, it is characterised in that pre-
Surely cheat the open caisson cutting depth below bottom to be calculated according to engineering geological condition, calculation takes foundation pit Resistant heave checking computations side
FormulaIn formula：H- is by the definite excavation of foundation pit depth (m) of parking well floor level requirement；D- is pressed
The present invention claims increased cutting depths (m)；γ1、γ2- respectively soil body severe (the kN/m at open caisson wall outside and hole bottom3)；q-
Overcharge on ground (kPa)；Nc, Nq- factor of soil bearing capacity, Ks- Resistant heave safety coefficients.
3. underground parking according to claim 2 controls construction method with the Resistant heave of ultra-deep open caisson, it is characterised in that adopts
With Prandtl calculation formula, wherein Nc, Nq is respectively：WithSafety coefficient requires Ks≤1.10-1.20, and Ks=1.20 is taken when calculating d minimum values.
4. underground parking according to claim 2 controls construction method with the Resistant heave of ultra-deep open caisson, it is characterised in that adopts
With Terzaghi calculation formula, Nc, Nq are respectively：WithSafety coefficient
It is required that Ks≤1.15-1.25, Ks=1.25 is taken when calculating d minimum values.
5. the underground parking according to claim 1 or 2 or 3 or 4 controls construction method with the Resistant heave of ultra-deep open caisson, special
Sign is that backfilling use bankets either clay or concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711106737.1A CN108049418A (en) | 2017-11-10 | 2017-11-10 | Underground parking controls construction method with the Resistant heave of ultra-deep open caisson |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711106737.1A CN108049418A (en) | 2017-11-10 | 2017-11-10 | Underground parking controls construction method with the Resistant heave of ultra-deep open caisson |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108049418A true CN108049418A (en) | 2018-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711106737.1A Pending CN108049418A (en) | 2017-11-10 | 2017-11-10 | Underground parking controls construction method with the Resistant heave of ultra-deep open caisson |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109137931A (en) * | 2018-09-07 | 2019-01-04 | 广东省建工设计院有限公司 | A kind of anchorage length and uplift capacity calculation method suitable for narrow foundation pit |
| CN116240899A (en) * | 2023-05-12 | 2023-06-09 | 山东建筑大学 | Foundation pit excavation deformation control process based on inverted arch reinforcement |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191222914A (en) * | 1912-10-08 | 1913-06-19 | Francois Hennebique | Ferro-concrete Floating Blocks adapted to be Sunk for Submerged Constructional Work. |
| CN104314092A (en) * | 2014-10-30 | 2015-01-28 | 中交四航局第三工程有限公司 | Open caisson construction method based on substitution method |
-
2017
- 2017-11-10 CN CN201711106737.1A patent/CN108049418A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191222914A (en) * | 1912-10-08 | 1913-06-19 | Francois Hennebique | Ferro-concrete Floating Blocks adapted to be Sunk for Submerged Constructional Work. |
| CN104314092A (en) * | 2014-10-30 | 2015-01-28 | 中交四航局第三工程有限公司 | Open caisson construction method based on substitution method |
Non-Patent Citations (2)
| Title |
|---|
| 林家富: "富含水的软弱地基中大直径沉井底板施工技术", 《建筑施工》 * |
| 蒋国盛等: "《基坑工程》", 30 November 2000, 中国地质大学出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109137931A (en) * | 2018-09-07 | 2019-01-04 | 广东省建工设计院有限公司 | A kind of anchorage length and uplift capacity calculation method suitable for narrow foundation pit |
| CN109137931B (en) * | 2018-09-07 | 2019-12-24 | 广东省建工设计院有限公司 | Method for calculating embedding length suitable for narrow foundation pit |
| CN116240899A (en) * | 2023-05-12 | 2023-06-09 | 山东建筑大学 | Foundation pit excavation deformation control process based on inverted arch reinforcement |
| CN116240899B (en) * | 2023-05-12 | 2023-08-15 | 山东建筑大学 | Foundation pit excavation deformation control process based on inverted arch reinforcement |
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Application publication date: 20180518 |