CN109440778A - Active inclined in two-way method for supporting and protecting row pile pit - Google Patents
Active inclined in two-way method for supporting and protecting row pile pit Download PDFInfo
- Publication number
- CN109440778A CN109440778A CN201811411534.8A CN201811411534A CN109440778A CN 109440778 A CN109440778 A CN 109440778A CN 201811411534 A CN201811411534 A CN 201811411534A CN 109440778 A CN109440778 A CN 109440778A
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- Prior art keywords
- pile
- introversion
- support pile
- stake
- support
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- 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.)
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Classifications
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- 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
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
Abstract
The invention discloses a kind of active inclined in two-way method for supporting and protecting row pile pit, using following steps: 1) staggeredly squeezing into stake bottom designed elevation the flare support pile to the tilted introversion support pile in hole and to hole outer incline on the inside of foundation pit edge, while water seal curtain is arranged at the rear of flare support pile；2) one jack is set in the stake top of every introversion support pile；3) crown beam that all introversion support piles and all flare support piles are connected is set on the inclined in two-way campshed being made of all introversion support piles and all flare support piles；4) the enclosed soil body of introversion support pile is excavated to hole bottom designed elevation, during excavation or before excavating, control expansive force is applied using the jack pair introversion support pile being arranged in step 2), to reduce the soil body and displacement at pile top.The present invention can largely reduce displacement at pile top, reduce bending, reduce project cost, increase cutting depth, reduce a possibility that overturning occurs for foundation pit.
Description
Technical field
The present invention relates to a kind of foundation pit supporting method, especially a kind of active inclined in two-way method for supporting and protecting row pile pit.
Background technique
Row of piles supporting is one of widest pattern foundation pit supporting structure form of current domestic application.Row of piles structure and diaphram wall phase
Than having many advantages, such as construction technology is simple, at low cost, horizontal layout is flexible.Spaced pile row retaining structure is suitable for
No underground water allows the case where cheating outer precipitation, forms continuous wall side by side when setting water-stop curtain or with other hybrid stakes
When, it can also be used to weak aquifer water-bearing stratum.When excavation of foundation pit is shallower, geological conditions is preferable, environmental requirement (especially deformation requirements)
When not high, cantilever pile support form can be used.Campshed supporting can also carry out anchoring or in foundation pit plus each using anchor pole
The support of seed type improves the support capacity of campshed.It, can be with when excavation of foundation pit area is larger, ground is weak, environmental requirement is high
Using Internal-shoring Supporting.When foundation pit soil layer condition is preferable, reaches and draw anchor condition, and when surrounding enviroment are of less demanding, can adopt
With drawing anchor formula supporting.
The shortcomings that common campshed supporting, stake are Vertical Pile, carry out campshed supporting using Vertical Pile mainly has:
First, the displacement at pile top of identical cutting depth is big, and internal force is big, so that ground after stake is generated moderate finite deformation, jeopardizes surrounding
Environment.
Second, it is easy to cause slope protection pile to fracture when the intensity of stake is inadequate and makes instability of foundation pit, and foundation pit can excavate
Depth it is smaller, be easy to that overturning occurs when cutting depth is larger, therefore supporting construction needs bigger section and insertion deep
Degree.
During deep pit digging, due to the off-load of deep basal pit cause surrounding soil and foundation pit itself displacement field and
There is biggish variation and further leads to ground settlement, building enclosure lateral deformation and the foundation pit bottom in hole week in stress field
It is the problems such as uplift of soil, excessive so as to cause displacement at pile top.If applying active control to it, so that it may reduce the soil body and stake top
Displacement.
A kind of domestic and international relatively advanced technology is " deep foundation ditch steel support shaft force Hydrauservo System " at present.However, this
Kind technology relies primarily on horizontally-supported applied hydraulic axle power to carry out active control to foundation pit deformation, and occupied space is big, makes
Valence is high, not environmentally also uneconomical.
Therefore, it researches and develops one kind and is suitable for soft clay area ultra-deep, super foundation, while branch economic, quickly, energy saving, safe
Maintaining method is the urgent need of existing market development.
Summary of the invention
The present invention is to solve technical problem present in well-known technique and provide a kind of active two-way inclined in two-way campshed
Foundation pit supporting method, this method can largely reduce displacement at pile top, reduce bending, reduce project cost, increase
Add cutting depth, reduces a possibility that overturning occurs for foundation pit.
The technical scheme adopted by the present invention to solve the technical problems existing in the known art is that a kind of active two-way
Tilt method for supporting and protecting row pile pit, using following steps: 1) on the inside of the foundation pit edge by cheat tilted introversion support pile and
It is staggeredly squeezed into the flare support pile of hole outer incline to stake bottom designed elevation, while water proof curtain is set at the rear of flare support pile
Curtain；2) one jack is set in the stake top of every introversion support pile；3) by all introversion support piles and all flare supportings
The crown beam that all introversion support piles and all flare support piles are connected is set on the inclined in two-way campshed that stake is constituted；4) it opens
The enclosed soil body of introversion support pile is dug to hole bottom designed elevation, during excavation or before excavating, using setting in step 2)
Jack pair introversion support pile apply control expansive force, to reduce the soil body and displacement at pile top.
On the basis of above scheme, the present invention has also done following improvement:
The step 1), the tilt angle of introversion support pile are greater than 0 degree and are less than or equal to 30 degree.
The step 1), the tilt angle of flare support pile are greater than 0 degree and are less than or equal to 30 degree.
The step 1), introversion support pile and flare support pile stake bottom depth are 2~2.5 times of excavation of foundation pit depth.
The stake spacing of the step 1), adjacent introversion support pile and flare support pile is 2~2.5 times of stake diameters.
The step 1), introversion support pile and flare support pile diameter are 300~600mm.
The step 3), crown beam width are more than or equal to support pile stake diameter connected to it or stake section side length, are highly greater than
Equal to 0.6 times of support pile stake diameter connected to it or 0.6 times of section side length.
The step 3), both sides respectively expand 1/2 diameter or 1/2 section side length to crown beam in the width direction.
The step 1), introversion support pile and flare support pile are spaced 1~2 pile pressure using pile construction method indentation is jumped
Enter next pile.The advantages and positive effects of the present invention are:
One) it is displaced using jack pair inclined in two-way campshed and carries out active control, it should in the identical situation of cutting depth
Method can largely reduce displacement at pile top, greatly reduce ground deformation after stake, avoid causing brokenly ambient enviroment
It is bad, while can reduce bending, make the reduction of pile body design strength, so that project cost is reduced, with very big economic meaning
Justice.
Two) using jack pair inclined in two-way campshed be displaced carry out active control, when stake is long and stake design strength with commonly
When campshed is identical, cutting depth can be made to increase, there is preferable technological value；Since excavation face tilts, foundation pit topples
A possibility that destruction, greatly reduces, very big for the security implications of base pit engineering；
Three) it is displaced using jack pair inclined in two-way campshed and carries out active control, due to the above inclined in two-way campshed supporting
The advantages of, the base pit engineering of anchor formula supporting may be needed using Internal-shoring Supporting or drawn originally, at this time merely with cantilever pile supporting
Design requirement can be met, to keep design and construction easier, and material is saved, to reduce engineering cost.
In conclusion the present invention can be suitable for carrying out pattern foundation pit supporting structure using campshed it is expected to reduce displacement at pile top again, increase
Cutting depth reduces campshed overturning possibility or reduces campshed design strength to reduce the foundation pit supporting project of cost.
Detailed description of the invention
Fig. 1 is using structural schematic diagram of the invention.
In figure: 1, crown beam；2, bottom is cheated；3, foundation pit edge；4, introversion support pile；5, flare support pile；6, jack.
Specific embodiment
In order to further understand the content, features and effects of the present invention, the following examples are hereby given, and cooperate attached drawing
Detailed description are as follows:
Referring to Fig. 1, a kind of active inclined in two-way method for supporting and protecting row pile pit, using following steps:
1) it will be handed over to the tilted introversion support pile 4 in hole and to the flare support pile 5 of hole outer incline along 3 inside of foundation pit edge
Mistake is squeezed into stake bottom designed elevation, while water seal curtain is arranged at the rear of flare support pile 5；
2) one jack 6 is set in the stake top of every introversion support pile 4；
3) being arranged on the inclined in two-way campshed being made of all introversion support piles 4 and all flare support piles 5 will own
The root cap beam 1 that introversion support pile 4 and all flare support piles 5 are connected；
4) the enclosed soil body of introversion support pile 4 is excavated to hole bottom designed elevation, during excavation or before excavating, is used
The jack 6 being arranged in step 2) applies control expansive force to introversion support pile, to reduce the soil body and inclined in two-way campshed stake top
Displacement.
The present invention is the improvement to common row of piles supporting, replaces vertical campshed with inclined in two-way campshed, according to calculate and
Site condition allows pattern foundation pit supporting structure campshed to be alternately tilted a certain angle to foundation pit inner side and outer side, while in introversion support pile
Jack is arranged in stake top, applies axial control force to pile body.
Basic principle of the invention is:
On the one hand, it is well known that grade of side slope is more stable when small bigger than the gradient, more difficult to topple and monolithic stability
Destruction.Similarly there are the side slope of certain slope to stablize than vertical side slope, thus supporting get up it is simpler, to supporting
The requirement of structure is lower.Method of the invention is based on this thought, certain oblique using having in the case where place allows
The campshed of degree carries out supporting to foundation pit.Meanwhile when carrying out pattern foundation pit supporting structure with taper pile, after stake with tendency toward sliding sphenoid than
Sphenoid when stake is vertical is small, the reason is that sphenoid is because the gradient has lacked a part after stake.Therefore, active force meeting of the soil body to stake
Substantially reduce, such displacement at pile top and pile body stress can all reduce very much.
On the other hand, during deep pit digging, since the variation of displacement and stress fields will lead to surrounding soil
Deform, it is excessive so as to cause the soil body and displacement at pile top, if pile body can be given to apply a thrust, thrust direction and the soil body and
The direction of displacement of stake top is on the contrary, then can effective limiting displacement.The present invention is based on this thought, in introversion support pile stake top
Jack is set, axial control expansive force is applied by jack pair pile body, so that horizontal thrust component can be generated, utilization is very heavy
Top carries out effective control in real time for the soil body and displacement at pile top, to largely reduce displacement.
For theoretically, the gradient of stake is bigger, and the stress and displacement at pile top of stake are smaller, thus it is more economical, but stake is oblique
Degree unconfined cannot increase, because due to the limitation of construction site, the gradient of stake may be kept too big without enough spaces,
On the other hand, when the gradient of stake is big, foundation depth stake below is due to reaching foundation pit inner space hereinafter, stake may be will affect
The construction of base.In addition the inclination of stake can make the long increase of stake, offset a part because pile strength reduces bring economy, and make
Support pile difficulty of construction increases.Therefore in actual application, the determination of gradient should fully consider various aspects for taper pile supporting
Factor.
Under the same conditions, it can reduce the tilt angle of inclined in two-way campshed using the present invention, shorten inclined in two-way row
The stake of stake is long, shortens the stake spacing of inclined in two-way campshed, reduces the stake diameter of inclined in two-way campshed.It is needed before construction according to place item
Part and calculating analysis, determine optimal inclined in two-way campshed tilt angle, long to stake to be designed with pile strength.The present invention is only
It is applicable in cantilever pile support pattern.The present invention recommends the tilt angle of introversion support pile 4 to be greater than 0 degree less than or equal to 30 degree；Flare branch
The tilt angle of fender pile 5 is greater than 0 degree and is less than or equal to 30 degree；5 bottom depth of introversion support pile 4 and flare support pile are 2~2.5 times
Excavation of foundation pit depth；The stake spacing of adjacent introversion support pile 4 and flare support pile 5 is 2~2.5 times of stake diameters.4 He of introversion support pile
5 diameter of flare support pile is 300~600mm.
Concrete construction method of the invention:
One) the inclined in two-way campshed being made of isometric introversion support pile 4 and flare support pile 5 is made using prefabricated pile
Industry.Jump pile construction method can be used in introversion support pile 4 and flare support pile 5, and 1~2 pile of interval is pressed into next prefabricated pile.
Cement mixing pile water seal curtain is being set at inclined in two-way campshed stake top 0.2L (L is that the stake of flare support pile is long) position, every
The mixing pile stake bottom absolute altitude of water curtain is identical as inclined in two-way campshed stake bottom absolute altitude, inclined in two-way campshed described herein by etc.
Long introversion support pile 4 and flare support pile 5 form.
The construction method of above-mentioned cement mixing pile water seal curtain:
1) position: deep mixer arrival refers to fixed pile, centering.
2) it stirs sinking in advance: after the cooling water of deep mixer circulation is normal, starting mixer motor, loosen blender and hang
Rope makes blender cut native sinking along leading truck stirring.
3) it prepares cement slurry: when deep mixer sinks to certain depth, that is, starting to stir by the determining match ratio of design
Cement slurry is mixed, pours into cement slurry in aggregate bin before mud jacking.
4) it promotes whitewashing stirring: after deep mixer sinks to projected depth, opening slurry pump for cement slurry and be pressed into ground
In, and side whitewashing, Bian Xuanzhuan, while deep mixer is promoted in strict accordance with the determining promotion speed of design.
5) upper and lower stirring: cement slurry when deep mixer is promoted to the top surface absolute altitude of projected depth, in aggregate bin is repeated
It should just empty.For when weak soil and cement slurry stir evenly, can again by blender while rotation while sink in soil, until design reinforcement
Blender is lifted out ground again after depth.
6) it cleans: cleaning cement slurry remaining in whole pipelines, and the weak soil for being adhered to stirring-head is cleaned up.
7) it shifts: deep mixer being moved into next position, is repeated the above steps.
Two) one jack 6 is set in the stake top of every introversion support pile 4, jack control route is connected to scene and applies
Work control centre can control pile body displacement by jack at any time by the detection soil body and displacement at pile top.
Three) crown beam 1 is set on introversion support pile 4 and flare support pile 5.The width of recommendation crown beam 1 is more than or equal to and it
The support pile stake diameter or stake section side length (square pile) of connection, highly more than or equal to 0.6 times of (circle of support pile stake diameter connected to it
Stake) or stake section side length 0.6 times (square pile)；Preferable design is: both sides respectively expand 1/2 diameter (circle to crown beam 1 in the width direction
Stake) or 1/2 section side length (square pile).
The construction of above-mentioned crown beam 1:
1) the crown beam earthwork is excavated using mechanical subregion, is first excavated the first layer earthwork to support pile and is designed stake top absolute altitude, removes
Start to abolish pile crown laitance to designed elevation after remaining soil, the concrete of stake core top surface wants dabbing to handle, and removes stake top dross, such as sets
Design requirement is not achieved in meter absolute altitude pile crown concrete strength, must continue to abolish until concrete quality reaches design requirement, insufficient absolute altitude section is poured
Pouring molding together when crown beam concrete.
2) inter-pile soil is manually flattened to hat bottom elevation, and rams packing reality.
3) reinforcement fabrication can be carried out by crown beam section arrangement of reinforcement after pile crown is abolished.Steel Reinforcing Bar Material, binding error ensure to meet
Design and construction code requirement.
4) check simultaneously installation template to crown beam absolute altitude.Must ensure when template support form stable, securely, to prevent pouring
Template deformation when concrete, template sectional dimension are made by crown beam section.
5) reinforced bar engineering is completed.Muscle is indulged preferably with HRB335 grades or HRB400 grades of reinforcing bars, stirrup and tension rib should use
HPB300 grades and HRB335 grades of reinforcing bars.
6) concreting and maintenance are completed.Strength grade of concrete is not lower than C25, and campshed main reinforcement anchors into crown beam and do not answer
Less than 35d (d is bar diameter).
Four) the enclosed soil body of introversion support pile to hole 2 designed elevation of bottom is excavated to adopt during excavation or before excavating
Apply control expansive force with the jack pair introversion support pile being arranged in step 2), to reduce the soil body and displacement at pile top.It can adopt
With " first control and excavate afterwards " and " controlling when excavating " two methods, first method first applies control pre-expansion to pile body
Power excavates the soil body afterwards；Second method is each stage in digging process, according to the soil body and displacement at pile top, applies control
Expansive force can be carried out the excavation of soil layer to generate a certain size pre- thrust to the soil body after stablizing.
For the foundation pit of stage excavation, above-mentioned construction procedure is repeated until being excavated to the bottom of foundation pit.
Although the preferred embodiment of the present invention is described above in conjunction with attached drawing, the invention is not limited to upper
The specific embodiment stated, the above mentioned embodiment is only schematical, be not it is restrictive, this field it is common
Technical staff under the inspiration of the present invention, in the case where not departing from present inventive concept and scope of the claimed protection, goes back
Many forms can be made, within these are all belonged to the scope of protection of the present invention.
Claims (9)
1. a kind of active inclined in two-way method for supporting and protecting row pile pit, which is characterized in that use following steps:
1) the flare support pile to the tilted introversion support pile in hole and to hole outer incline is staggeredly squeezed on the inside of foundation pit edge
To stake bottom designed elevation, while at the rear of flare support pile, water seal curtain is set；
2) one jack is set in the stake top of every introversion support pile；
3) it is arranged on the inclined in two-way campshed being made of all introversion support piles and all flare support piles by all introversion branch
The root cap beam that fender pile and all flare support piles are connected；
4) the enclosed soil body of introversion support pile is excavated to hole bottom designed elevation, during excavation or before excavating, using step
2) the jack pair introversion support pile being arranged in applies control expansive force, to reduce the soil body and displacement at pile top.
2. active inclined in two-way method for supporting and protecting row pile pit according to claim 1, which is characterized in that the step
1), the tilt angle of introversion support pile is greater than 0 degree and is less than or equal to 30 degree.
3. active inclined in two-way method for supporting and protecting row pile pit according to claim 1, which is characterized in that the step
1), the tilt angle of flare support pile is greater than 0 degree and is less than or equal to 30 degree.
4. active inclined in two-way method for supporting and protecting row pile pit according to claim 1, which is characterized in that the step
1), introversion support pile and flare support pile stake bottom depth are 2~2.5 times of excavation of foundation pit depth.
5. active inclined in two-way method for supporting and protecting row pile pit according to claim 1, which is characterized in that the step
1), the stake spacing of adjacent introversion support pile and flare support pile is 2~2.5 times of stake diameters.
6. active inclined in two-way method for supporting and protecting row pile pit according to claim 1, which is characterized in that the step
1), introversion support pile and flare support pile diameter are 300~600mm.
7. active inclined in two-way method for supporting and protecting row pile pit according to claim 1, which is characterized in that the step
3), the width of crown beam is more than or equal to support pile stake diameter connected to it or stake section side length, is highly more than or equal to connected to it
0.6 times of 0.6 times of support pile stake diameter or section side length.
8. active inclined in two-way method for supporting and protecting row pile pit according to claim 7, which is characterized in that the step
3), both sides respectively expand 1/2 diameter or 1/2 section side length to crown beam in the width direction.
9. active inclined in two-way method for supporting and protecting row pile pit according to claim 1, which is characterized in that the step
1), introversion support pile and flare support pile are spaced 1~2 pile and are pressed into next pile using pile construction method indentation is jumped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811411534.8A CN109440778B (en) | 2018-11-24 | 2018-11-24 | Active bidirectional inclined row pile foundation pit supporting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811411534.8A CN109440778B (en) | 2018-11-24 | 2018-11-24 | Active bidirectional inclined row pile foundation pit supporting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109440778A true CN109440778A (en) | 2019-03-08 |
| CN109440778B CN109440778B (en) | 2020-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811411534.8A Active CN109440778B (en) | 2018-11-24 | 2018-11-24 | Active bidirectional inclined row pile foundation pit supporting method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110735433A (en) * | 2019-06-25 | 2020-01-31 | 广东力源液压机械有限公司 | double-row construction method and construction equipment for unsupported precast inclined pile support of foundation pit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1502716A1 (en) * | 1987-07-07 | 1989-08-23 | Новосибирский инженерно-строительный институт им.В.В.Куйбышева | Pile foundation |
| JP2006328716A (en) * | 2005-05-24 | 2006-12-07 | Shimizu Corp | Structure and method for underpinning of existing structure and method of constructing new structure near existing structure |
| CN107574825A (en) * | 2017-07-27 | 2018-01-12 | 天津大学 | Foundation pit supporting method and raked pile |
| CN207700207U (en) * | 2017-11-09 | 2018-08-07 | 海南大学 | A kind of settlement Control device of raft foundation |
-
2018
- 2018-11-24 CN CN201811411534.8A patent/CN109440778B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1502716A1 (en) * | 1987-07-07 | 1989-08-23 | Новосибирский инженерно-строительный институт им.В.В.Куйбышева | Pile foundation |
| JP2006328716A (en) * | 2005-05-24 | 2006-12-07 | Shimizu Corp | Structure and method for underpinning of existing structure and method of constructing new structure near existing structure |
| CN107574825A (en) * | 2017-07-27 | 2018-01-12 | 天津大学 | Foundation pit supporting method and raked pile |
| CN207700207U (en) * | 2017-11-09 | 2018-08-07 | 海南大学 | A kind of settlement Control device of raft foundation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110735433A (en) * | 2019-06-25 | 2020-01-31 | 广东力源液压机械有限公司 | double-row construction method and construction equipment for unsupported precast inclined pile support of foundation pit |
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| Publication number | Publication date |
|---|---|
| CN109440778B (en) | 2020-12-29 |
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