CN209620032U - Active inclination double-row pile foundation pit support structure - Google Patents
Active inclination double-row pile foundation pit support structure Download PDFInfo
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- CN209620032U CN209620032U CN201821945655.6U CN201821945655U CN209620032U CN 209620032 U CN209620032 U CN 209620032U CN 201821945655 U CN201821945655 U CN 201821945655U CN 209620032 U CN209620032 U CN 209620032U
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- pile
- foundation pit
- row
- stake
- support pile
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Abstract
The utility model discloses a kind of active inclination double-row pile foundation pit support structures, including be arranged on foundation pit edge to cheating tilted front-seat support pile and to the heel row support pile of hole outer incline, at the rear of heel row support pile, water seal curtain is set, in the stake top of every front-seat support pile, one jack is set, crown beam is respectively set on front-seat support pile and heel row support pile, the crown beam of front-seat support pile and the crown beam of heel row support pile are linked to be entirety using coupling beam.The utility model applies control expansive force by using jack pair front row support pile, to reduce the soil body and displacement at pile top, displacement at pile top can largely be reduced, reduce bending, reduce project cost, increases cutting depth, reduce a possibility that overturning occurs for foundation pit, it 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, reduce campshed overturning possibility or reduce campshed design strength to reduce the foundation pit supporting project of cost.
Description
Technical field
The utility model relates to a kind of foundation pit supporting construction, especially a kind of active inclination double-row pile pattern foundation pit supporting structure knot
Structure.
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
Protection structure is the urgent need of existing market development.
Summary of the invention
The utility model is to solve technical problem present in well-known technique and provide a kind of active double pile foundation of inclination
Pit supporting construction, the structure can largely reduce displacement at pile top, reduce bending, reduce project cost, increase
Cutting depth reduces a possibility that overturning occurs for foundation pit.
The utility model is adopted the technical scheme that solve technical problem present in well-known technique: a kind of active
Tilt double-row pile foundation pit support structure, which is characterized in that including the front-seat supporting tilted to hole being arranged on foundation pit edge
Stake and to hole outer incline heel row support pile, the heel row support pile rear be arranged water seal curtain, at the every front row
A jack is arranged in the stake top of support pile, crown beam is respectively set on the front-seat support pile and the heel row support pile, institute
The crown beam of the crown beam and the heel row support pile of stating front-seat support pile is linked to be entirety using coupling beam.
On the basis of above scheme, the utility model has also done following improvement:
The tilt angle of the front row support pile is greater than 0 degree and is less than or equal to 30 degree.
The tilt angle of the heel row support pile is greater than 0 degree and is less than or equal to 30 degree.
The front row support pile and heel row support pile stake bottom depth are 2~2.5 times of excavation of foundation pit depth.
The front row support pile and the heel row support pile stake spacing are 2~2.5 times of stake diameters.
The front row support pile and the heel row support pile diameter are 300~600mm.
The width of the crown beam be more than or equal to support pile stake diameter connected to it or stake section side length, highly be more than or equal to
0.6 times of its connect 0.6 times of support pile stake diameter or section side length.
Both sides respectively expand 1/2 diameter or 1/2 section side length to the crown beam in the width direction.
The even depth of beam is 300~400mm, and width is 200~300mm.
The utility model has the advantages and positive effects of:
One) active control, the knot in the identical situation of cutting depth are carried out using jack pair inclination double-row pile displacement
Structure can largely reduce displacement at pile top, greatly reduce ground deformation after stake, avoid damaging ambient enviroment,
It can reduce bending simultaneously, make the reduction of pile body design strength, to reduce project cost, have a great economic significance.
Two) using jack pair inclination double-row pile displacement carry out active control, when stake is long and stake design strength and commonly arrange
When stake is identical, cutting depth can be made to increase, there is preferable technological value；Since excavation face tilts, foundation pit topples brokenly
Bad a possibility that, greatly reduces, very big for the security implications of base pit engineering；
Three) active control is carried out using jack pair inclination double-row pile displacement, due to tilting the excellent of Double-row Piles Support above
Point may need originally using Internal-shoring Supporting or draw the base pit engineering of anchor formula supporting, at this time can merely with cantilever pile supporting
To meet design requirement, to keep design and construction easier, and material is saved, to reduce engineering cost.
In conclusion the utility model 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, reduce campshed overturning possibility or reduces campshed design strength to reduce the foundation pit support of cost
Journey.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
In figure: 1, crown beam；2, bottom is cheated；3, foundation pit edge；4, front-seat support pile；5, heel row support pile；6, coupling beam；7, very heavy
Top.
Specific embodiment
For the invention, features and effects that can further appreciate that the utility model, the following examples are hereby given, and cooperates
Detailed description are as follows for attached drawing:
Referring to Fig. 1, a kind of active inclination double-row pile foundation pit support structure, including be arranged on foundation pit edge 3 to
Cheat tilted front-seat support pile 4 and the heel row support pile 5 to hole outer incline, at the rear of the heel row support pile 5 setting every
A jack 7 is arranged in the stake top of the every front-seat support pile 4, in the front-seat support pile 4 and the heel row in water curtain
Crown beam 1 is respectively set on support pile 5, the crown beam 1 of the front row support pile 4 and the crown beam 1 of the heel row support pile 5 use coupling beam
6 are linked to be entirety.
The basic principle of the utility model 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.The utility model is based on this thought, in the case where place allows, using with constant slope
Campshed to foundation pit carry out supporting.Meanwhile when carrying out pattern foundation pit supporting structure with taper pile, the sphenoid after stake with tendency toward sliding is than stake
Sphenoid when vertical is small, the reason is that sphenoid is because the gradient has lacked a part after stake.Therefore, the soil body can be big to the active force of stake
Width reduces, and 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 utility model is based on this thought, sets in front-seat stake top
Jack is set, axial control expansive force is applied by jack pair pile body and utilizes jack so that horizontal thrust component can be generated
Effective control in real time is carried out 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, double-row pile tilt angle can reduce using the utility model, the stake for shortening double-row pile is long, contracting
Stub spacing reduces stake diameter.It is needed before construction according to site condition and calculates analysis, determine optimal inclination double-row pile inclination angle
Degree, it is long to stake to be designed with pile strength.The utility model is only applicable in cantilever pile support pattern.The utility model is recommended front-seat
The tilt angle of support pile 4 is greater than 0 degree and is less than or equal to 30 degree；The tilt angle of heel row support pile 5 is greater than 0 degree and is less than or equal to 30
Degree；5 bottom depth of front-seat support pile 4 and heel row support pile are 2~2.5 times of excavation of foundation pit depth；Front-seat support pile 4 and heel row branch
5 spacing of fender pile are 2~2.5 times of stake diameters.Front-seat support pile 4 and 5 diameter of heel row support pile are 300~600mm.
The concrete construction method of the utility model:
One) operation is carried out using prefabricated pile by the inclination double-row pile that isometric front-seat support pile 4 and heel row support pile 5 form,
It will be squeezed into tilted front-seat support pile 4 is cheated to stake bottom designed elevation along the inside of foundation pit edge 3, it will be to the heel row of hole outer incline
Support pile 5 is squeezed into stake bottom designed elevation, while water seal curtain is arranged at the rear of heel row support pile 5.Front-seat support pile 4 is with after
Jump pile construction method can be used in row's support pile 5, and 1~2 pile of interval is pressed into next prefabricated pile.Apart from heel row support pile 5
Cement mixing pile water seal curtain, the mixing pile stake bottom of water seal curtain are set at stake top 0.2L (L is that the stake of heel row support pile is long) position
Absolute altitude is identical as inclination double-row pile stake bottom absolute altitude, and inclination double-row pile described herein is by isometric front-seat support pile 4 and heel row
Support pile 5 forms.
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 7 is set in the stake top of every front-seat 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 respectively set on front-seat support pile 4 and heel row support pile 5, using coupling beam 6 by front-seat support pile and
Crown beam 1 on heel row support pile is linked to be entirety；The width of crown beam 1 is recommended to be more than or equal to support pile stake diameter connected to it or stake section
Face side length, highly more than or equal to 0.6 times (circle stake) of support pile stake diameter connected to it or 0.6 times of (side of stake section side length
Stake)；Preferable design is: both sides respectively expand 1/2 diameter (circle stake) or 1/2 section side length (square pile) to crown beam 1 in the width direction.
The height for recommending coupling beam 6 is 300~400mm, and width is 200~300mm.
The construction of above-mentioned crown beam 1 and coupling beam 6:
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 manually flattens to crown beam or connects bottom elevation, and rams packing reality.
3) reinforcement fabrication can be carried out by crown beam, coupling beam section arrangement of reinforcement after pile crown is abolished.Steel Reinforcing Bar Material, binding error ensure
Meet design and construction code requirement.
4) check simultaneously installation template to crown beam, coupling beam absolute altitude.Must ensure when template support form stable, securely, with
Template deformation when preventing pouring concrete, template sectional dimension are made by crown beam, coupling 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 front-seat support pile to hole 2 designed elevation of bottom is excavated to adopt during excavation or before excavating
Apply control expansive force with jack pair front row support pile, to reduce the soil body and displacement at pile top.It can use and " first control and open afterwards
Dig " and " being controlled when excavating " two methods, first method, which first applies pile body, controls pre-expansion 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, thus to soil
Body generates a certain size pre- thrust, can be carried out the excavation of soil layer after stablizing.
For the foundation pit of stage excavation, above-mentioned construction procedure is repeated until being excavated to the bottom 2 of foundation pit.
Although being described above in conjunction with preferred embodiment of the attached drawing to the utility model, the utility model is not
It is confined to above-mentioned specific embodiment, the above mentioned embodiment is only schematical, is not restrictive, ability
The those of ordinary skill in domain is not departing from the utility model aims and claimed under the enlightenment of the utility model
In the case where range, many forms can also be made, these are belonged within the protection scope of the utility model.
Claims (9)
1. a kind of active inclination double-row pile foundation pit support structure, which is characterized in that including be arranged on foundation pit edge to hole
Tilted front-seat support pile and the heel row support pile to hole outer incline, are arranged water proof curtain at the rear of the heel row support pile
A jack is arranged in the stake top of the every front-seat support pile, in the front-seat support pile and the heel row support pile in curtain
On be respectively set crown beam, the crown beam of the front row support pile and the crown beam of the heel row support pile are linked to be entirety using coupling beam.
2. active inclination double-row pile foundation pit support structure according to claim 1, which is characterized in that the front row supporting
The tilt angle of stake is greater than 0 degree and is less than or equal to 30 degree.
3. active inclination double-row pile foundation pit support structure according to claim 1, which is characterized in that the heel row supporting
The tilt angle of stake is greater than 0 degree and is less than or equal to 30 degree.
4. active inclination double-row pile foundation pit support structure according to claim 1, which is characterized in that the front row supporting
Stake and heel row support pile stake bottom depth are 2~2.5 times of excavation of foundation pit depth.
5. active inclination double-row pile foundation pit support structure according to claim 1, which is characterized in that the front row supporting
Stake and the heel row support pile stake spacing are 2~2.5 times of stake diameters.
6. active inclination double-row pile foundation pit support structure according to claim 1, which is characterized in that the front row supporting
Stake and the heel row support pile diameter are 300~600mm.
7. active inclination double-row pile foundation pit support structure according to claim 1, which is characterized in that the width of the crown beam
Degree is more than or equal to support pile stake diameter connected to it or stake section side length, highly more than or equal to support pile stake diameter connected to it
0.6 times of 0.6 times or section side length.
8. active inclination double-row pile foundation pit support structure according to claim 7, which is characterized in that the crown beam is along wide
Degree direction both sides respectively expand 1/2 diameter or 1/2 section side length.
9. active inclination double-row pile foundation pit support structure according to claim 1, which is characterized in that the height of the coupling beam
Degree is 300~400mm, and width is 200~300mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821945655.6U CN209620032U (en) | 2018-11-24 | 2018-11-24 | Active inclination double-row pile foundation pit support structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821945655.6U CN209620032U (en) | 2018-11-24 | 2018-11-24 | Active inclination double-row pile foundation pit support structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209620032U true CN209620032U (en) | 2019-11-12 |
Family
ID=68444142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821945655.6U Active CN209620032U (en) | 2018-11-24 | 2018-11-24 | Active inclination double-row pile foundation pit support structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209620032U (en) |
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2018
- 2018-11-24 CN CN201821945655.6U patent/CN209620032U/en active Active
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