CN106703059B - Open caisson cross trough-pulling construction method - Google Patents
Open caisson cross trough-pulling construction method Download PDFInfo
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- CN106703059B CN106703059B CN201710017682.0A CN201710017682A CN106703059B CN 106703059 B CN106703059 B CN 106703059B CN 201710017682 A CN201710017682 A CN 201710017682A CN 106703059 B CN106703059 B CN 106703059B
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- open caisson
- kerve
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- 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
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- 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
- E02D23/08—Lowering or sinking caissons
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a kind of open caisson cross trough-pulling construction methods, including：Step 1: after the completion of open caisson connects height, with the center of compartment for criss-cross central excavation cross kerve in the compartment of open caisson, the section of cross kerve is in parabola shaped, and the lower digging depth of the center position of cross kerve is maximum, it will be dug under cross kerve to well sinking, and be connect height again after well sinking to specified absolute altitude；Step 2: above steps may be repeated multiple times one, until at well sinking to designed elevation.Open caisson cross trough-pulling construction method of the invention optimizes well sinking stage structures stress, solves the problems, such as that open caisson tradition is excavated in method for sinking and open caisson drawing crack easily occurs, and for solving, open caisson excavation cannot sink and prominent heavy prevention etc. has preferable effect.
Description
Technical field
The present invention relates to the realm of building construction.It is more particularly related to a kind of open caisson cross kerve construction party
Method.
Background technique
Well foundation buried depth is big, globality is strong, stability is good, obtains in Longspan Bridge anchorage in recent years extensively
Using.Open caisson ontology is made in open caisson construction method first on ground or melt pit, i.e. production has opening, armored concrete
Manufactured sinking well component stack shell, after which reaches some strength, layering shoveling, muck haulage in pit shaft, with native in well
Face gradually decreases, and open caisson stack shell overcomes the frictional resistance between open caisson outer wall and soil layer by its self weight, constantly sinks and reaches pre-
Fixed detail design position.
The 1960s has developed well foundation in Nanjing Yangtze River Bridge construction；Then in Jiangyin Yangtse River suspension bridge north anchor
Heavy stone used as an anchor (open caisson planar dimension 69m × 51m, high 56m)；Four bridge north anchorage of yangtze river in nanjing (open caisson planar dimension 69m × 58m, it is high
52.8m)；Parrot continent Yangtze Bridge north anchorage (the novel open caisson outer diameter 66m in circular hole ring section, high 43m)；Ma'an Mountain's Yangtze Bridge
It is applied in north anchorage (open caisson is having a size of 60.2m × 55.4m, high 41m) etc. multiple sciences of bridge building.
Years development is passed through in open caisson construction, but during sinking construction, when especially engineering is with complicated hydrogeological conditions,
Well sinking still remains the risks such as sinking is stagnated, prominent heavy, structure is destroyed.Therefore it needs to design a kind of open caisson excavation method, make
Open caisson steadily sinks to having very high application value under conditions of meeting structure safety.
Summary of the invention
It is an object of the invention to solve the above problems, and provide the advantages of will be described later.
It is a still further object of the present invention to provide a kind of open caisson cross trough-pulling construction methods, by with the centre bit of open caisson
It is set to central excavation cross kerve and is excavated to the construction method of sinking, solve open caisson tradition and excavate easily to go out in method for sinking
The problem of existing open caisson drawing crack, cannot sink for solution open caisson excavation and heavy prevention etc. of dashing forward has preferable effect.
In order to realize these purposes and other advantages according to the present invention, a kind of open caisson cross kerve construction party is provided
Method includes the following steps：
Step 1: being opened after the completion of open caisson connects height in the compartment of open caisson with the center of compartment for criss-cross center
Dig cross kerve, the section of cross kerve is in parabola shaped, and the cutting depth of the center position of cross kerve
Cross kerve is excavated to well sinking, is connect height again after well sinking to specified absolute altitude by maximum；
Step 2: above steps may be repeated multiple times one, until at well sinking to designed elevation.
Preferably, it before excavating cross kerve in the step 1, is excavated under the partition wall of every two adjacent compartment
Depth is 0.2m.
Preferably, when excavating cross kerve in the step 1, criss-cross each edge is from the partition wall bottom of compartment
One end extend to the opposite other end.
Preferably, when excavating cross kerve in the step 1, criss-cross each edge is opened in the form of symmetrical
It digs.
Preferably, it before excavating cross kerve every time in the step 1, is connect according to ultimate bearing capacity of foundation soil, open caisson
High weight and open caisson and formation-engaging surfaces product, excavation area needed for calculating well sinking calculate cross according to excavation area is corresponding
Then shape kerve groove width excavates cross kerve according to the cross kerve groove width being calculated.
Preferably, after symmetrically being excavated in the step 1 according to the cross kerve groove width being calculated, if open caisson is not
Sink, cross kerve groove width is increased to 1.1~1.5 times of the cross kerve groove width being calculated.
Preferably, after excavating cross kerve in the step 1, the soil body outside cross kerve slot can be uniformly excavated,
Soil body difference in height in the outer soil body of the cross kerve in open caisson compartment and slot is set to be no more than 0.5m.
Preferably, the compartment of open caisson is rectangle in the step 1.
The present invention is include at least the following beneficial effects：
Open caisson cross trough-pulling construction method of the invention makes open caisson each compartment when excavating have soil body support, ties
More optimize in terms of structure stress；Even if can also be stepped up excavation groove width when ultimate bearing capacity of foundation soil is larger and to sink
Underground is heavy, gradually spreads open caisson when excavation method is excavated around from center according to tradition so as to avoid open caisson and is easy to drawing crack
Situation.The inventive method geometry gesture stability during well sinking, the optimization of caisson structure stress, operation are simplified have compared with
Big benefit.Open caisson cross trough-pulling construction method of the invention optimizes well sinking stage structures stress, solves open caisson biography
System, which excavates, easily there is the problem of open caisson drawing crack in method for sinking, reality can be can adapt to according to being actually adjusted by excavating groove width
Border engineering situation complicated and changeable, cannot sink for solution open caisson excavation and heavy prevention etc. of dashing forward has preferable effect.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of open caisson and compartment of the invention；
Fig. 2 is the schematic diagram of the cross kerve excavated in open caisson of the invention；
Fig. 3 is the partial enlargement diagram in open caisson of the invention between adjacent compartment.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples, to enable those skilled in the art's reference
Specification word can be implemented accordingly.
It should be noted that in the description of the present invention, term " transverse direction ", " longitudinal direction ", "upper", "lower", "front", "rear",
The orientation or positional relationship of the instructions such as "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is based on attached drawing institute
The orientation or positional relationship shown, is merely for convenience of description of the present invention and simplification of the description, and is not the dress of indication or suggestion meaning
It sets or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as to limit of the invention
System.
Embodiment 1
Step 1: being opened after the completion of open caisson connects height in the compartment of open caisson with the center of compartment for criss-cross center
Dig cross kerve, the section of cross kerve is in parabola shaped, and the cutting depth of the center position of cross kerve
Cross kerve is excavated to well sinking, is connect height again after well sinking to specified absolute altitude by maximum；
Step 2: above steps may be repeated multiple times one, until at well sinking to designed elevation.
It in embodiment 1, when open caisson excavates, is excavated in compartment by cross kerve mode, compartment may herein
For rectangle, square, circle etc..Since cross kerve is parabola shaped, and removes and excavates the soil body at cross kerve position,
The remaining position soil body does not excavate substantially, so that open caisson either compartment or the case where multiple compartments when excavating, compartment is equal
There is soil body support, stress is more evenly.Cross kerve excavation width can be determining according to caisson structure and engineering geological condition etc., open caisson
It sinks to specify and connect at high position, open caisson connects height, can calculate excavation width needed for cross recess again, and excavation is sunk down into specified again
Absolute altitude.The open caisson data for acquiring different phase in the process realize control by stages construction, apply to the open caisson under different stress conditions
Work can use different cross recess excavation widths instead, using it is more flexible, gear to actual circumstances.Open caisson cross kerve construction of the invention
Method more to optimize in terms of structure stress, when ultimate bearing capacity of foundation soil is larger, can also be stepped up excavation groove width
So that well sinking, gradually spreads open caisson when excavation method is excavated from center according to tradition so as to avoid open caisson around and is easy to
The case where drawing crack, Practical Project situation complicated and changeable can be can adapt to, for open caisson according to being actually adjusted by excavating groove width
Geometry gesture stability in sinking watching, the optimization of caisson structure stress, operation, which simplify and cannot sink for open caisson and dash forward, to sink
Prevention has larger benefit.
In another technical solution, before excavating cross kerve in the step 1, in every two adjacent compartment
Cutting depth is 0.2m under partition wall.In the case where multiple compartments, under the partition wall of every two adjacent compartment it is lower dig make compartment by
Power more evenly, and is conducive to well sinking, further avoids drawing crack situation caused by unbalance stress in sinking watching.
When excavating cross kerve in another technical solution, in the step 1, criss-cross each edge is from compartment
One end of partition wall bottom extend to the opposite other end.
When excavating cross kerve in another technical solution, in the step 1, criss-cross each edge is with right
The form of title is excavated.The two opposite sides in each edge may be selected when construction while excavating, make stress more evenly.
In another technical solution, before excavating cross kerve every time in the step 1, base stage limit in base area is held
Carry power, open caisson connects high weight and open caisson and formation-engaging surfaces product, excavation area needed for calculating well sinking, according to excavation area pair
Cross kerve groove width should be calculated, cross kerve is then excavated according to the cross kerve groove width being calculated.
According to《Code for structural design of water supply and sewerage engineering》(GBJ69-84-2002) 6.1 section of chapter 6 provides in, under open caisson
Heavy coefficient should meet following formula requirement：
kst≥1.05 (1)
kst=(Gk-Ffw,k)/Ffk=(G+G '-Fw)/(R1+R2) (2)
In formula：kstSubsidence factor；
GkOpen caisson deadweight standard value (including the additional standard value for helping heavy amount) (kN)；
G '-construction live load；
Ffw,kThe uplift pressure standard value (kN) of water in sinking watching；
FfkThe total frictional resistance standard value (kN) of the borehole wall；
R1Blade foot and partition wall bottom surface utmost lateral friction；
R2Open caisson threshold friction.
After the completion of open caisson connects height, excavation area needed for well sinking need to be calculated.According to formula (2), when under open caisson
Open caisson can sink when heavy coefficient is 1.05, in known open caisson self weight Gk, open caisson construction load G ', buoyancy Ffw,k, the soil body and open caisson
Between side friction, ultimate bearing capacity of foundation soil, so it is counter push away subsidence factor be 1.05 when, corresponding open caisson utmost lateral friction
R1.Wherein R1For the product of open caisson bearing area and ultimate bearing capacity of foundation soil, according to R1Open caisson can be calculated with foundation bearing capacity
Bearing area, and the difference of open caisson total cross-section area and bearing area is required excavation area.Further basis is calculated
Cross kerve groove width is calculated in required excavation area.After connecing height every time, according to new open caisson self weight GkEtc. data count again
Calculate cross kerve groove width.
In another technical solution, symmetrically excavated in the step 1 according to the cross kerve groove width being calculated
Afterwards, if open caisson does not sink, cross kerve groove width is increased to the 1.1~1.5 of the cross kerve groove width being calculated
Times.If open caisson does not sink in work progress, cross kerve groove width can be incrementally increased, such as according to 1.1 times of calculated value,
1.2 times etc. are gradually incremented by.
In another technical solution, after excavating cross kerve in the step 1, cross kerve can be uniformly excavated
The soil body outside slot makes soil body difference in height in the outer soil body of the cross kerve in open caisson compartment and slot be no more than 0.5m.Due to preparatory
Lower depth of digging is 0.2m under the partition wall of every two adjacent compartment, after excavating cross kerve on this basis, in compartment
Soil body difference in height is greater than 0.2m in the outer soil body of cross kerve and slot, in order to facilitate the later period it is further lower dig cross kerve,
Keep stress in compartment more balanced, soil body difference in height is no more than 0.5m, practice of construction mistake in the outer soil body of control cross kerve and slot
Cheng Zhong, when difference in height will be more than 0.5m, the soil body that can uniformly excavate outside partial cross shape kerve slot reduces height difference.
In another technical solution, the compartment of open caisson is rectangle in the step 1.
Embodiment 2
As shown in Figures 1 to 3, the present invention provides a kind of open caisson cross trough-pulling construction method, includes the following steps：
Step 1: after the completion of open caisson connects height, under the partition wall of the compartment 2 of every two adjacent rectangle be at 3 under dig depth
For 0.2m；
High weight and open caisson and formation-engaging surfaces product are connect according to ultimate bearing capacity of foundation soil, open caisson, is calculated needed for well sinking
Excavation area calculates cross kerve groove width according to excavation area is corresponding, then according to 1 groove width of cross kerve being calculated
Excavate cross kerve 1；
Using the center of open caisson as the center of cross kerve 1 in the compartment of open caisson 2 when excavation, criss-cross
Two opposite sides are excavated in the form of symmetrical, and the section of cross kerve 1 is in parabola shaped, and the centre bit of cross kerve 1
The lower digging depth for setting place is maximum, by the lower digging of cross kerve 1 to well sinking；
If open caisson does not sink, 1 groove width of cross kerve is increased to 1 groove width of cross kerve being calculated
1.1~1.5 times, according to digging in-situ situation, the soil body outside 1 slot of cross kerve can be uniformly excavated, ten in open caisson compartment 2 are made
Soil body difference in height is no more than 0.5m in the outer soil body of font kerve 1 and slot, is connect height again after well sinking to specified absolute altitude；
Step 2: above steps may be repeated multiple times one, until at well sinking to designed elevation.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein and embodiment.
Claims (8)
1. a kind of open caisson cross trough-pulling construction method, which is characterized in that include the following steps：
Step 1: after the completion of open caisson connects height, with the center of compartment for criss-cross central excavation ten in the compartment of open caisson
Font kerve, the section of cross kerve is in parabola shaped, and the cutting depth of the center position of cross kerve is maximum,
Cross kerve is excavated to well sinking, is connect height again after well sinking to specified absolute altitude；
Step 2: above steps may be repeated multiple times one, until at well sinking to designed elevation.
2. open caisson cross trough-pulling construction method as described in claim 1, which is characterized in that excavate cross in the step 1
Before shape kerve, cutting depth is 0.2m under the partition wall of every two adjacent compartment.
3. open caisson cross trough-pulling construction method as claimed in claim 2, which is characterized in that excavate cross in the step 1
When shape kerve, criss-cross each edge extends to the opposite other end from one end under the partition wall of compartment.
4. open caisson cross trough-pulling construction method as described in claim 1, which is characterized in that excavate cross in the step 1
When shape kerve, criss-cross each edge is excavated in the form of symmetrical.
5. open caisson cross trough-pulling construction method as claimed in claim 2, which is characterized in that excavated every time in the step 1
Before cross kerve, high weight and open caisson and formation-engaging surfaces product are connect according to ultimate bearing capacity of foundation soil, open caisson, calculated under open caisson
Excavation area needed for heavy calculates cross kerve groove width according to excavation area is corresponding, is then drawn according to the cross being calculated
Slot groove width excavates cross kerve.
6. open caisson cross trough-pulling construction method as claimed in claim 5, which is characterized in that according to calculating in the step 1
After obtained cross kerve groove width is symmetrically excavated, if open caisson does not sink, cross kerve groove width is increased to and is calculated
1.1~1.5 times of the cross kerve groove width arrived.
7. open caisson cross trough-pulling construction method as claimed in claim 2, which is characterized in that excavate cross in the step 1
After shape kerve, the soil body outside cross kerve slot is uniformly excavated, makes soil in the outer soil body of the cross kerve in open caisson compartment and slot
Body difference in height is no more than 0.5m.
8. open caisson cross trough-pulling construction method as claimed in claim 3, which is characterized in that in the step 1 open caisson every
Cabin is rectangle.
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| CN201710017682.0A CN106703059B (en) | 2017-01-11 | 2017-01-11 | Open caisson cross trough-pulling construction method |
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| CN201710017682.0A CN106703059B (en) | 2017-01-11 | 2017-01-11 | Open caisson cross trough-pulling construction method |
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| CN106703059B true CN106703059B (en) | 2018-11-20 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109881697A (en) * | 2019-01-28 | 2019-06-14 | 中交第二航务工程局有限公司 | A kind of open caisson, which loosens the soil, examines side pressure method for sinking |
| CN110528551B (en) * | 2019-08-08 | 2021-04-06 | 中交第二航务工程局有限公司 | Open caisson W-shaped excavation sinking construction method |
| CN110565670B (en) * | 2019-08-09 | 2020-12-11 | 中铁八局集团有限公司 | Construction method of open caisson non-drainage sinking construction system |
| CN111501809B (en) * | 2020-04-13 | 2021-07-02 | 中铁大桥勘测设计院集团有限公司 | Sinking method of ultra-large open caisson |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61172924A (en) * | 1985-01-25 | 1986-08-04 | Sumitomo Kensetsu Kk | Method of sinking caisson |
| CN87102887A (en) * | 1987-04-16 | 1988-11-02 | 株式会社明治树脂化成 | Gravity structure and manufacture method thereof |
| CN102635124A (en) * | 2012-04-23 | 2012-08-15 | 浙江省建工集团有限责任公司 | Construction method aiming to large open caisson in weak soil area |
| CN205012359U (en) * | 2015-09-08 | 2016-02-03 | 山东科技大学 | Barrel -shaped basis in branch storehouse of direction is passed through to adjustable sinking |
-
2017
- 2017-01-11 CN CN201710017682.0A patent/CN106703059B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61172924A (en) * | 1985-01-25 | 1986-08-04 | Sumitomo Kensetsu Kk | Method of sinking caisson |
| CN87102887A (en) * | 1987-04-16 | 1988-11-02 | 株式会社明治树脂化成 | Gravity structure and manufacture method thereof |
| CN102635124A (en) * | 2012-04-23 | 2012-08-15 | 浙江省建工集团有限责任公司 | Construction method aiming to large open caisson in weak soil area |
| CN205012359U (en) * | 2015-09-08 | 2016-02-03 | 山东科技大学 | Barrel -shaped basis in branch storehouse of direction is passed through to adjustable sinking |
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Effective date of registration: 20171207 Address after: 430048 Wuhan, East Lake District, Hubei Jin Lake Road, No. 11 Applicant after: China Communications 2nd Navigational Bureau Applicant after: ZHONGJIAO WUHAN ZHIXING INTERNATIONAL ENGINEERING CONSULTING CO., LTD. Applicant after: CCCC SHEC Fourth Engineering Co., Ltd. Address before: 430048 Wuhan, East Lake District, Hubei Jin Lake Road, No. 11 Applicant before: China Communications 2nd Navigational Bureau Applicant before: ZHONGJIAO WUHAN ZHIXING INTERNATIONAL ENGINEERING CONSULTING CO., LTD. |
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Effective date of registration: 20210901 Address after: 430048 No. 11 Jinyinhu Road, Dongxihu District, Wuhan City, Hubei Province Patentee after: The Second Harbor Engineering Co. Patentee after: CCCC WUHAN ZHIXING INTERNATIONAL ENGINEERING CONSULTING Co.,Ltd. Patentee after: CCCC SHEC FOURTH ENGINEERING Co.,Ltd. Patentee after: CCCC HIGHWAY BRIDGES NATIONAL ENGINEERING RESEARCH CENTER Co.,Ltd. Address before: 430048 No. 11 Jinyinhu Road, Dongxihu District, Wuhan City, Hubei Province Patentee before: The Second Harbor Engineering Co. Patentee before: CCCC WUHAN ZHIXING INTERNATIONAL ENGINEERING CONSULTING Co.,Ltd. Patentee before: CCCC SHEC FOURTH ENGINEERING Co.,Ltd. |