CN105951864A - Prevention method for soft soil foundation settlement caused by open caisson manufacturing - Google Patents
Prevention method for soft soil foundation settlement caused by open caisson manufacturing Download PDFInfo
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- CN105951864A CN105951864A CN201610357583.2A CN201610357583A CN105951864A CN 105951864 A CN105951864 A CN 105951864A CN 201610357583 A CN201610357583 A CN 201610357583A CN 105951864 A CN105951864 A CN 105951864A
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- open caisson
- cutting shoe
- soft soil
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- shoe
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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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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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Abstract
The invention relates to a prevention method for soft soil foundation settlement caused by open caisson manufacturing. The prevention method comprises the following steps that the open caisson wall friction resistance is increased; construction of an open caisson top structure is postponed, and after an open caisson barrel body is stably sunk, the open caisson top structure is together constructed according to the actually measured elevation; the bottom area of an open caisson is increased, and the width of annular edge feet is increased; and a cross beam is additionally arranged at the bottom of the open caisson, so that the situation that the edge feet are damaged due to uneven stress in the sinking process of the open caisson is prevented. Compared with the prior art, the prevention method for soft soil foundation settlement caused by open caisson manufacturing has the advantages that 1, the application range is wide, and open caisson sudden settlement or inclination can be prevented with regard to open caisson manufacturing and construction on a soft soil foundation and other various foundations insufficient in bearing capacity according to the actual requirement of a construction site and the method provided by the invention; 2, application is convenient and can be achieved through the targeted improvement of the open caisson structure; and 3, the safety and the reliability are achieved, and potential safety hazards brought by sudden settlement or inclination in the open caisson manufacturing process to a project can be effectively avoided.
Description
Technical field
The invention belongs to open caisson manufacture technical field, particularly relate to the soft soil base sedimentation preventing and treating side that a kind of open caisson manufacture causes
Method.
Background technology
Open caisson is a kind of device collecting sewage, builds up on foundation ditch, sinks to certain absolute altitude with long-armed digging machine, then uses push pipe
Being connected, carry out chute, just close the lid can, lid is the most cast-in-place, and density is good, and the prefabricated duration is short.
Well foundation is the underground structure with drop shaft sinking construction and a kind of pattern of deep foundation.It is first to be fabricated to one on earth's surface
The works (open caisson) of pit shaft shape, then by constantly cutting the earth in well under the going along with sb. to guard him of the borehole wall, makes open caisson at Gravitative Loads
Under gradually sink, after reaching predetermined design absolute altitude, then carry out back cover, construct internal structure.Be widely used in bridge, chimney,
The basis of water tower；The deep-well structures such as pump house, oil cellar, pond vertical shaft and shield or the active well of push pipe.
Open caisson is the works of pit shaft shape, overcomes the form of wall friction resistance to sink with self gravitation of cutting the earth in well, rely on.
Well sinking is to after designed elevation, through concrete sealing bottom and clog wellhole, becomes the basis of Bridge Pier or other works.
Due to open caisson have in Construction of Deep Foundation floor space little, without supporting, be suitable for the advantages such as wide, the investment reduction of soil property scope,
Be widely used in the foundation ditch of Bridge Piers, sewage pumping station, large equipment base, people's air defense shelter, shield assembly well,
The construction of underground roadways and station water conservancy project foundation construction enclosure device etc..
Owing to being restricted by geological conditions and construction environment, open caisson usually makes on soft soil foundation.In manufacturing process, with
Gradually completing of making, the pressure of ground is gradually increased by open caisson.Mainly big by natural moisture content, the compression due to weak soil
Property high, the mud deposit composition of bearing capacity difference, its integral anti-shearing intensity is relatively low with bearing capacity, often leads to open caisson unexpected
Sedimentation or inclination, bring great hidden danger to engineering safety and construction quality.
Summary of the invention
The technical problem to be solved is to provide the soft soil base sedimentation prevention and controls that a kind of open caisson manufacture causes, and solves
Open caisson is built on soft soil foundation, often leads to open caisson and settles suddenly or tilt, brings greatly to engineering safety and construction quality
The problem of hidden danger.
The technical solution adopted for the present invention to solve the technical problems is: provide the soft soil base sedimentation that a kind of open caisson manufacture causes
Prevention and controls, including following steps:
A () increases caisson wall frictional resistance；
B () open caisson top structure postpones construction, after open caisson cylinder sinks and stablizes, according to actual measurement absolute altitude, together by open caisson top
Structure completes construction；
C () increases open caisson floor space, increase the width of annular cutting shoe；
D () increases rood beam bottom open caisson, prevent cutting shoe unbalance stress during well sinking and destroy.
The further technical scheme of the present invention is, in described step (a), during making open caisson, for increasing open caisson well
The frictional resistance of wall can start from open caisson, after caisson wall height is more than 5m outside open caisson after earth excavation to-5m
Carry out a cubic metre of earth back-filling in layers compacting.
The further technical scheme of the present invention is, in described step (b), postponing boundary of works area is open caisson top structure
In the range of the 3m of top.
The further technical scheme of the present invention is, in described step (c), cutting shoe is ladder configuration, reduces and increases width
The open caisson base drag that degree causes.
The further technical scheme of the present invention is, described cutting shoe is followed successively by outside cutting shoe, middle part cutting shoe and inner side from top to bottom
Cutting shoe, is increased, by annular cutting shoe width, the extra base drag of open caisson caused for reducing.
The further technical scheme of the present invention is, described outside cutting shoe is enclosed by outside cutting shoe horizontal plane and outside cutting shoe inclined plane
Becoming, middle part cutting shoe is surrounded by middle part cutting shoe horizontal plane and middle part cutting shoe inclined plane, and inner side cutting shoe is by inner side cutting shoe horizontal plane and interior
Side edge foot inclined plane surrounds.
The further technical scheme of the present invention is, described outside cutting shoe inclined plane is 45 °～85 ° with the angle of horizontal plane,
The angle of described middle part cutting shoe inclined plane and horizontal plane is 45 °～75 °, described inner side cutting shoe inclined plane overlaps with vertical,
It it is 90 ° with the angle of horizontal plane.
First described outside cutting shoe touches orlop soil, relies on the self gravitation of open caisson, cuts the soil body, and will cut
The soil body after cutting passes to middle part cutting shoe by outside cutting shoe inclined plane；Described middle part cutting shoe relies on the self gravitation of open caisson, enters
The soil body is cut by one step, and the soil body soil body after cutting and outside cutting shoe passed over is by middle part cutting shoe inclined plane
Pass to inner side cutting shoe；The soil body that middle part cutting shoe passes over is further transferred in open caisson cylinder by described inner side cutting shoe, finally
By cutting the earth, this part soil body is dug out.
The further technical scheme of the present invention is, in described step (d), the geometric center of described rood beam aligns open caisson
Geometric center, make rood beam all can realize the support to open caisson at vertical and horizontal, described rood beam longitudinal end with laterally
End is securely supported on open caisson respectively, it is achieved rood beam support to cutting shoe in machine and transverse direction.
The further technical scheme of the present invention is, in described step (d), described rood beam is a kind of armored concrete ten
Word beam, horizontal profile are " ten " font.
Beneficial effect
Compared with prior art, advantages of the present invention and beneficial effect include:
(1) present invention is applied widely, for the open caisson manufacture on soft soil foundation and other kinds Lack of support ground and
Construction, can being actually needed according to job site, the method provided according to the present invention, the suddenly sedimentation of preventing and treating open caisson or tilt；
(2) present invention is easy to application, by the specific aim of caisson structure is improved and can be realized；
(3) present invention is safe and reliable, settles suddenly or tilt the peace brought to engineering during can being prevented effectively from open caisson manufacture
Full hidden danger.
Accompanying drawing explanation
Fig. 1 is cutting shoe of the present invention and rood beam profile.
Fig. 2 is figure cutting shoe profile of the present invention.
Wherein: 1, open caisson, 2, rood beam, 3, foundation soil, 4, cutting shoe, 5, outside cutting shoe, 6, middle part cutting shoe, 7,
Inner side cutting shoe, 8, outside cutting shoe horizontal plane, 9, outside cutting shoe inclined plane, 10, middle part cutting shoe horizontal plane, 11, middle part sword
Foot inclined plane, 12, inner side cutting shoe horizontal plane, 13, inner side cutting shoe inclined plane.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is expanded on further.Should be understood that these embodiments be merely to illustrate the present invention and
It is not used in restriction the scope of the present invention.In addition, it is to be understood that after having read the content that the present invention lectures, people in the art
The present invention can be made various changes or modifications by member, and these equivalent form of values fall within the application appended claims equally and limited
Scope.
Embodiment 1
As illustrated in fig. 1 and 2, the soft soil base sedimentation prevention and controls that a kind of open caisson manufacture causes, it is characterised in that: include with
Lower step:
A () increases open caisson 1 wall friction resistance；
B () open caisson 1 top structure postpones construction, after open caisson 1 cylinder sinks and stablizes, according to actual measurement absolute altitude, together by open caisson
1 top structure completes construction；
C () increases open caisson 1 floor space, increase the width of annular cutting shoe 4；
D () increases rood beam 2 bottom open caisson 1, prevent cutting shoe unbalance stress in open caisson 1 sinking watching from destroying.
In described step (a), during making open caisson 1, the earthwork can be opened for increasing the frictional resistance of open caisson 1 borehole wall
Dig to-5m and start from open caisson 1, after open caisson 1 borehole wall height is more than 5m, outside open caisson 1, carries out a cubic metre of earth back-filling in layers
Compacting.
In described step (b), in the range of postponing the top 3m that boundary of works area is open caisson 1 top structure.
In described step (c), cutting shoe 4 is ladder configuration, reduces and increases open caisson 1 base drag that width causes；Institute
State cutting shoe 4 and be followed successively by outside cutting shoe 5, middle part cutting shoe 6 and inner side cutting shoe 7 from top to bottom, for reducing by annular cutting shoe width
Degree increases the extra base drag of open caisson 1 caused；Described outside cutting shoe 5 is tilted by outside cutting shoe horizontal plane 8 and outside cutting shoe
Face 9 surrounds, and middle part cutting shoe 6 is surrounded by middle part cutting shoe horizontal plane 10 and middle part cutting shoe inclined plane 11, and inner side cutting shoe 7 is by interior
Side edge foot horizontal plane 12 and inner side cutting shoe inclined plane 13 surround；Described outside cutting shoe inclined plane 9 is 45 with the angle of horizontal plane
°～85 °, described middle part cutting shoe inclined plane 11 is 45 °～75 ° with the angle of horizontal plane, described inner side cutting shoe inclined plane
13 overlap with vertical and the angle of horizontal plane is 90 °, as shown in Figure 2.
First described outside cutting shoe 5 touches orlop soil, relies on the self gravitation of open caisson 1, cuts the soil body, and
The soil body after cutting is passed to middle part cutting shoe 6 by outside cutting shoe inclined plane 9；Described middle part cutting shoe 6 relies on open caisson 1
Self gravitation, cuts the soil body further, and is passed through by the soil body that the soil body after cutting and outside cutting shoe 5 pass over
Middle part cutting shoe inclined plane 11 passes to inner side cutting shoe 7；The soil body that middle part cutting shoe 6 passes over is entered one by described inner side cutting shoe 7
Step is delivered in open caisson cylinder, is dug out by this part soil body finally by cutting the earth.
In described step (d), the geometric center of described rood beam 2 aligns the geometric center of open caisson 1, makes rood beam 2 exist
Vertical and horizontal all can realize the support to open caisson 1, and described rood beam 2 longitudinal end is securely supported at respectively with lateral ends
On open caisson 1, it is achieved rood beam 2 support to cutting shoe 4 in machine and transverse direction；Described rood beam 2 is a kind of reinforced concrete
Soil rood beam, horizontal profile are " ten " font.
Detailed description of the invention is:
(1) survey report with passing through and obtain clay distribution and the bearing capacity of open caisson region；Bearing capacity according to each soil layer is special
Value indicative, it is judged that the stability during open caisson manufacture；If can not keep stable, then take following measure；
(2) take to increase the technical measures of caisson wall frictional resistance, can open after earth excavation to-5m in manufacturing process
Begin to make open caisson, after caisson wall height is more than 5m, outside open caisson, carries out a cubic metre of earth back-filling in layers compacting；
(3) open caisson 1 top structure is postponed construction；As a example by Whirlwind tank, control requirement for meeting absolute altitude, reach simultaneously
Alleviate the purpose of deadweight, rotational flow settling pond outer wall top 3m scope can be postponed construction.After open caisson 1 cylinder sinks and stablizes,
During construction rotational flow settling pond inner core top board, together rotational flow settling pond top outer tube wall is constructed according to actual measurement absolute altitude.So
The deadweight of open caisson 1 can be alleviated, the absolute altitude of final end face can be efficiently controlled again；
(4) bottom open caisson, rood beam is increased；Rood beam counter blade sole mouth can be used to reinforce according to open caisson diameter；
Preresearch estimates rood beam depth of section is the 1/16～1/8 of open caisson diameter, and width is the 1/10～1/8 of open caisson diameter；
(5) caisson cutting edge is changed cutting shoe form provided by the present invention into, while ensureing cutting shoe soil cutting effect, reduce
Open caisson base drag, beneficially open caisson are sunk smoothly.
Claims (10)
1. the soft soil base sedimentation prevention and controls that an open caisson manufacture causes, it is characterised in that: comprise the following steps:
A () increases open caisson (1) wall friction resistance；
B () open caisson (1) top structure postpones construction, after open caisson (1) cylinder sinks and stablizes, according to actual measurement absolute altitude, together
Open caisson (1) top structure is completed construction；
C () increases open caisson (1) floor space, increase the width of annular cutting shoe (4)；
D () increases rood beam (2) in open caisson (1) bottom, prevent cutting shoe unbalance stress in open caisson (1) sinking watching from destroying.
The soft soil base sedimentation prevention and controls that a kind of open caisson manufacture the most according to claim 1 causes, it is characterised in that: institute
State in step (a), during making open caisson (1), can be by the earthwork for increasing the frictional resistance of open caisson (1) borehole wall
Start from open caisson (1) after being excavated to-5m, enter in open caisson (1) outside after open caisson (1) borehole wall height is more than 5m
Row earthwork back-filling in layers is compacted.
The soft soil base sedimentation prevention and controls that a kind of open caisson manufacture the most according to claim 1 causes, it is characterised in that: institute
State in step (b), in the range of postponement boundary of works area is the top 3m of open caisson (1) top structure.
The soft soil base sedimentation prevention and controls that a kind of open caisson manufacture the most according to claim 1 causes, it is characterised in that: institute
Stating in step (c), cutting shoe (4) is ladder configuration, reduces and increases open caisson (1) base drag that width causes.
The soft soil base sedimentation prevention and controls that a kind of open caisson manufacture the most according to claim 4 causes, it is characterised in that: institute
State cutting shoe (4) and be followed successively by outside cutting shoe (5), middle part cutting shoe (6) and inner side cutting shoe (7) from top to bottom, be used for subtracting
The little extra base drag of open caisson (1) caused by annular cutting shoe width increase.
The soft soil base sedimentation prevention and controls that a kind of open caisson manufacture the most according to claim 5 causes, it is characterised in that: institute
State outside cutting shoe (5) to be surrounded by outside cutting shoe horizontal plane (8) and outside cutting shoe inclined plane (9), middle part cutting shoe (6)
Being surrounded by middle part cutting shoe horizontal plane (10) and middle part cutting shoe inclined plane (11), inner side cutting shoe (7) is by inner side cutting shoe water
Plane (12) and inner side cutting shoe inclined plane (13) surround.
The soft soil base sedimentation prevention and controls that a kind of open caisson manufacture the most according to claim 6 causes, it is characterised in that: institute
The angle stating outside cutting shoe inclined plane (9) and horizontal plane is 45 °～85 °, described middle part cutting shoe inclined plane (11)
Being 45 °～75 ° with the angle of horizontal plane, described inner side cutting shoe inclined plane (13) overlaps with vertical and horizontal plane
Angle be 90 °.
The soft soil base sedimentation prevention and controls that a kind of open caisson manufacture the most according to claim 6 causes, it is characterised in that: institute
State outside cutting shoe (5) and first touch orlop soil, rely on the self gravitation of open caisson (1), the soil body is cut,
And the soil body after cutting is passed to middle part cutting shoe (6) by outside cutting shoe inclined plane (9)；Described middle part cutting shoe (6)
Rely on the self gravitation of open caisson (1), further the soil body is cut, and by the soil body after cutting and outside cutting shoe (5)
The soil body passed over passes to inner side cutting shoe (7) by middle part cutting shoe inclined plane (11)；Described inner side cutting shoe (7)
The soil body that middle part cutting shoe (6) passes over is further transferred in open caisson cylinder, finally by cutting the earth this part soil body
Dig out.
The soft soil base sedimentation prevention and controls that a kind of open caisson manufacture the most according to claim 1 causes, it is characterised in that: institute
Stating in step (d), the geometric center of described rood beam (2) aligns the geometric center of open caisson (1), makes rood beam (2)
The support to open caisson (1), described rood beam (2) longitudinal end and transverse end part all can be realized at vertical and horizontal
It is not securely supported on open caisson (1), it is achieved rood beam (2) support to cutting shoe (4) in machine and transverse direction.
The soft soil base sedimentation prevention and controls that a kind of open caisson manufacture the most according to claim 1 causes, it is characterised in that:
In described step (d), described rood beam (2) be a kind of armored concrete rood beam, horizontal profile be " ten " word
Shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610357583.2A CN105951864A (en) | 2016-05-26 | 2016-05-26 | Prevention method for soft soil foundation settlement caused by open caisson manufacturing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610357583.2A CN105951864A (en) | 2016-05-26 | 2016-05-26 | Prevention method for soft soil foundation settlement caused by open caisson manufacturing |
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| CN105951864A true CN105951864A (en) | 2016-09-21 |
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| CN201610357583.2A Pending CN105951864A (en) | 2016-05-26 | 2016-05-26 | Prevention method for soft soil foundation settlement caused by open caisson manufacturing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108277816A (en) * | 2018-01-04 | 2018-07-13 | 浙江大学城市学院 | A kind of digging-free construction method of well foundation |
| CN112695787A (en) * | 2020-12-25 | 2021-04-23 | 中国水利水电第七工程局有限公司 | Sinking soil taking construction method for open caisson at first section |
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| CN102505702A (en) * | 2011-10-13 | 2012-06-20 | 中国化学工程第十三建设有限公司 | Double-wall concrete open caisson and construction method thereof |
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| CN103556647A (en) * | 2013-11-15 | 2014-02-05 | 中冶赛迪工程技术股份有限公司 | #-shaped reinforced open caisson for soft soil geological rotational flow tank and construction method |
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2016
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| KR100651671B1 (en) * | 2005-12-20 | 2006-12-01 | 주식회사 동경 | Construction method using caisson |
| CN102155020A (en) * | 2011-01-28 | 2011-08-17 | 福建工程学院 | Open caisson construction method of reinforced concrete for soft soil layer |
| CN102505702A (en) * | 2011-10-13 | 2012-06-20 | 中国化学工程第十三建设有限公司 | Double-wall concrete open caisson and construction method thereof |
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| CN103556647A (en) * | 2013-11-15 | 2014-02-05 | 中冶赛迪工程技术股份有限公司 | #-shaped reinforced open caisson for soft soil geological rotational flow tank and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108277816A (en) * | 2018-01-04 | 2018-07-13 | 浙江大学城市学院 | A kind of digging-free construction method of well foundation |
| CN112695787A (en) * | 2020-12-25 | 2021-04-23 | 中国水利水电第七工程局有限公司 | Sinking soil taking construction method for open caisson at first section |
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Application publication date: 20160921 |