CN106677189A - Inclined pile wall bearing type foundation pit support structure and construction method thereof - Google Patents
Inclined pile wall bearing type foundation pit support structure and construction method thereof Download PDFInfo
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- CN106677189A CN106677189A CN201611169748.XA CN201611169748A CN106677189A CN 106677189 A CN106677189 A CN 106677189A CN 201611169748 A CN201611169748 A CN 201611169748A CN 106677189 A CN106677189 A CN 106677189A
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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
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Abstract
The invention discloses an inclined pile wall bearing type foundation pit support structure. The inclined pile wall bearing type foundation pit support structure is characterized by comprising an inclined pile wall, a bearing pile and a crown beam, the inclined pile wall is obliquely arranged, the top of the inclined pile wall is inclined towards the interior of a foundation pit, the bottom of the inclined pile wall obliquely enters a soil body outside the foundation pit, the bearing pile is vertically arranged below the top of the inclined pile wall, the top of the bearing pile and the top of the inclined pile wall are connected, and the bottom of the bearing pile is arranged in the soil body at the bottom of the foundation pit. Compared with the prior art, the inclined pile wall bearing type foundation pit support structure has the following beneficial effects that a horizontal diagonal brace system in the pit is eliminated, a good plane operation space is provided for foundation pit earth excavation and basement structure construction, the construction efficiency is greatly improved, and the manufacturing cost is saved; and a horizontal anchor cable anchored in the soil body outside the pit is eliminated, and the problem that the anchor cable exceeds the property line and infringes rights is solved.
Description
Technical field
The invention belongs to Geotechnical Engineering field, is related to a kind of taper pile wall supporting type foundation ditch in construction pit method for protecting support
Supporting construction and its construction method.
Background technology
The deep big foundation pit larger for planar dimension and cutting depth, at present the domestic foundation pit supporting method for adopting is main
For：Inner support supporting construction, anchored pile supporting, Retaining Structure with Double-row Piles.
The periphery building enclosure of inner support supporting construction and anchored pile supporting is typically prolonged foundation ditch periphery and arranges vertical post
Column campshed, diaphram wall, stiffening cement cob wall or interlocking pile etc..
The inner support horizontal layout form of inner support supporting construction mainly has：Grid type, to support truss, angle brace truss, side
Truss, annular brace etc..Supporting member is divided into horizontal shore and vertical support column, and column is arranged on Liang Liang and crosses node position
Put, material is steel pipe or shaped steel lattice, and per root post a pile base is divided into, and is primarily subjected to vertical load, while being also subjected to support
The part of horizontal load being delivered on column.Column spacing is generally 8~12 meters, for planar dimension is more than 100x100 rice
Deep big foundation pit, hole inner column can reach tens of even up to a hundred.When basement construction is planned to build, column is needed through basement
Base plate and floor.
In the stable soil body of the anchorage cable anchoring of anchored pile supporting outside foundation ditch, it is locked in and is arranged at building enclosure surface
On waist rail, anchor cable total length is located in the soil body, and freedom length is not less than 5 meters, and anchoring section is according to soil condition and design value of thrust
Size be not quite similar, common anchor cable length be 15~40 meters.
The double-row pile of Retaining Structure with Double-row Piles is connected as by front two rows piling wall by being arranged on the Guan Liang and coupling beam at top
Entirety, front two rows piling wall and inter-pile soil collective effect, form " gate-type " soil-baffling structure.
At present there are the following problems for technology：
1. for inner support supporting construction：
Due to a large amount of columns are distributed with foundation ditch, when foundation ditch carries out every layer of earth excavation, excavator operation and the earthwork are transported outward
When need avoid column, greatly reduce shoveling work efficiency, in addition the synergistic effect such as weather and appearance of the city control so that pit earthwork is opened
Degree of digging into is slow, so as to extend foundation ditch use time and overall duration, deep pit monitor, project progress is adversely affected.
Due to there is a large amount of supporting members and column in foundation ditch so that working space office when planning to build basement structure construction
Promote, work efficiency is reduced.
Because column spacing is less, and for steel construction, various equipment easily cause to damage to it during earth excavation, from
And affect deep pit monitor.
A large amount of columns are needed through basement bottom board, although column is worn and be respectively provided with base plate steel plate for sealing water, but due to underground
The waterproof layer of room base plate is worn out by column, and waterproof slab effect is difficult to ensure that.
Because every root post has pile foundation, the cost of inner support support engineering is significantly increased, especially in soft clay area.
2. for anchored pile supporting：
Anchor cable total length in pile-anchor retaining is arranged in the soil body beyond foundation ditch, often surmounts land red-line, to red line outside
Adjacent engineering construction forms obstacle, or even invades opposite field ground property rights.
3. for Retaining Structure with Double-row Piles：
Although Retaining Structure with Double-row Piles significantly enhances the rigidity of building enclosure by " gate-type " structure, cantilever is increased
Shield height, eliminates the adverse effect of inner support or anchor cable, but remain as cantilever beam because it accepts mechanism, when foundation depth compared with
When depth or poor soil property, lateral pressure is very big, then the diameter of double-row pile needs very greatly, and cost is very high, and is difficult to strict control
Deformation.
Further, since front two rows stake is set, and it is larger to plane site demand, it is difficult to when excavation face is close to construction of structures
Implement.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, there is provided a kind of taper pile wall brace type foundation pit supporting construction
And its construction method.
The present invention is achieved by the following technical solutions：
A kind of taper pile wall brace type foundation pit supporting construction, it is characterised in that：Taper pile wall brace type foundation pit supporting construction includes
Taper pile wall, supporting pile and Guan Liang, taper pile wall is obliquely installed, and taper pile wall top is towards foundation ditch inner inclination, and the bottom of taper pile wall is oblique
To in the soil body outside foundation ditch, supporting pile is vertically arranged at taper pile wall top lower section, supporting pile top and taper pile wall top phase
Even, supporting pile bottom is arranged in the soil body of bottom of foundation ditch.
As further improvement of these options, the continuous body of wall that taper pile wall is made up of the taper pile for being mutually twisted overlap joint,
Taper pile includes meat or fish stake and plain stake, wherein meat or fish stake configuration reinforcement cage, is reinforced concrete pile, and plain stake does not configure steel reinforcement cage, is that element is mixed
The stake of solidifying soil.
Used as further improvement of these options, the length of meat or fish stake is more than the length of plain stake, and meat or fish passes through obliquely downwards latent
In slip-crack surface, in anchoring into the stable soil body below Foundation Pit bottom, plain stake is arranged in the interval between meat or fish stake, is engaged with meat or fish stake and is taken
Connect.
As further improvement of these options, taper pile coping is provided with Guan Liang, Guan Liang connects all meat or fish stakes
With the top of plain stake, supporting pile is connected with the meat or fish stake in taper pile wall at Guan Liang.
Used as further improvement of these options, taper pile wall lower section is additionally provided with the second taper pile wall, the second taper pile wall
Structure is identical with the structure of taper pile wall, and the second taper pile coping arranges waist rail, and waist rail is connected with the waist of supporting pile.For depth
The larger foundation ditch of degree, can adopt the scheme of multilamellar taper pile wall supporting.
The present invention also provides a kind of construction method of taper pile wall brace type foundation pit supporting construction, it is characterised in that step is such as
Under：
Step one, form taper pile wall, and while supporting pile of constructing in the stake of natural ground construction meat or fish and plain stake；
Step 2, after meat or fish stake, plain stake and supporting pile driving construction are finished, in the top construction hat of meat or fish stake, plain stake and supporting pile
Supporting pile and taper pile wall are connected as entirety by beam；
Step 3, overall excavation pit all complete to bottom, pattern foundation pit supporting structure and earth excavation is cheated, and transfer civil engineering unit
Carry out basement structure construction.
The present invention also provides the construction method of Double-layer oblique piling wall brace type foundation pit supporting construction, it is characterised in that step is such as
Under：
Step one, taper pile wall, and supporting pile of constructing are formed in the stake of natural ground construction meat or fish and plain stake, while construction second is oblique
Piling wall, bear is set to staying between natural ground in the stake top of meat or fish stake and the plain stake of the second taper pile wall；
Step 2, after step one construction is finished, meat or fish stake, plain stake and supporting pile top construction Guan Liang by supporting pile and
Taper pile wall is connected as entirety；
Step 3, excavation pit to middle excavation face, the height of middle excavation face are flushed with the position height of waist rail, applied
Work waist rail, by the second taper pile wall and supporting pile entirety is connected as；
Step 4, foundation ditch bottom is excavated to, pattern foundation pit supporting structure and earth excavation all complete, transferring civil engineering unit carries out ground
Lower cell structure construction.
The present invention has compared to existing technology advantages below：Present invention eliminates column of the level to support and below, only
One row's Vertical Pile and taper pile are set in margin of foundation pit, taper pile pile body inclining is entered in the outer soil body of foundation ditch, is not take up earth's surface place, nothing
Horizontal support and anchor cable, excavate for pit earthwork and basement structure construction provide good plane operation space, carry significantly
High efficiency of construction, so as to reduce foundation ditch open-assembly time, shortens the duration.Taper pile is significantly smaller than anchor into the size outside foundation ditch
Rope, solves anchor cable and surmounts land red-line infringement problem.The present invention will act at the level in traditional building enclosure by taper pile
Soil pressure load major part is changed into vertical gravity laod, then is undertaken by vertical supporting pile, changes the stress of building enclosure
Pattern, effect is better than conventional boom-mounted double-row pile, is significantly reduced building enclosure sectional dimension, saving construction cost.
Description of the drawings
Fig. 1 is sectional view of the present invention for monolayer taper pile wall.
Fig. 2 is sectional view of the present invention for two-layer taper pile wall.
Fig. 3 is the top view of the present invention.
Fig. 4 present invention is used for the construction process schematic diagram one of monolayer taper pile wall.
Fig. 5 present invention is used for the construction process schematic diagram two of monolayer taper pile wall.
Fig. 6 present invention is used for the construction process schematic diagram one of two-layer taper pile wall.
Fig. 7 present invention is used for the construction process schematic diagram two of two-layer taper pile wall.
Fig. 8 present invention is used for the construction process schematic diagram three of two-layer taper pile wall.
Specific embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out under premised on technical solution of the present invention
Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following enforcements
Example.
Embodiment 1
The brace type foundation pit supporting construction of monolayer taper pile wall 2, it is characterised in that：The brace type foundation pit supporting construction bag of taper pile wall 2
Taper pile wall 2, supporting pile 3 and Guan Liang 4 are included, taper pile wall 2 is obliquely installed, the top of taper pile wall 2 is towards foundation ditch inner inclination, taper pile wall 2
The oblique entrance foundation ditch in bottom outside the soil body in, supporting pile 3 is vertically arranged at the top of taper pile wall 2 lower section, the top of supporting pile 3 with it is oblique
The top of piling wall 2 is connected, and the bottom of supporting pile 3 is arranged in the soil body at 6, foundation ditch bottom.Generally the angle of inclination of taper pile wall is 10~30
Degree, depending on the depth profile according to soil property situation and foundation ditch.
Conventional foundation pit supporting construction needs to arrange widely distributed supporting construction in foundation ditch, makes the space quilt in foundation ditch
Segmentation is taken, efficiency of construction is substantially reduced；Common anchored pile supporting, the restriction that under tension is required, anchor cable is met mostly
Face the problem stretched out land red-line 7 and cannot use；Common Retaining Structure with Double-row Piles need to meet certain front and rear row away from, because
And more plane site is taken, often do not possess execution conditions when periphery place is less.
By this programme, only taper pile wall 2 and supporting pile 3 are set at the edge of foundation ditch, by the level of the foundation ditch periphery soil body
The pressure conversion in direction is the power of vertical direction, and is delivered to 6, foundation ditch bottom by supporting pile 3；Taper pile wall 2 inclines insertion foundation ditch
Outward, earth's surface place will not be taken, without horizontal support and anchor cable, is excavated for pit earthwork and basement structure construction is provided well
Plane operation space, substantially increase efficiency of construction, so as to reduce foundation ditch open-assembly time, shorten the duration；Taper pile is entered
Size outside foundation ditch is significantly smaller than anchor cable, solves the problems, such as that anchor cable surmounts the infringement of land red-line 7.The present invention will be acted on by taper pile
Horizontal earth pressure load major part in traditional building enclosure is changed into vertical gravity laod, then is held by vertical supporting pile 3
Load, changes the force modes of building enclosure, and effect is better than conventional boom-mounted double-row pile, is significantly reduced building enclosure section chi
It is very little, saving construction cost.
The continuous body of wall that taper pile wall 2 is made up of the taper pile for being mutually twisted overlap joint, taper pile includes meat or fish stake 21 and plain stake 22, wherein
The configuration reinforcement cage of meat or fish stake 21, is reinforced concrete pile, and plain stake 22 does not configure steel reinforcement cage, is plain concrete pile.
The length of meat or fish stake 21 is more than the length of plain stake 22, and meat or fish passes through obliquely downwards Potential failure surface 1, anchors into Foundation Pit bottom 6
In the following stable soil body, plain stake 22 is arranged in the interval between meat or fish stake 21, and with meat or fish stake 21 overlap joint is engaged.Meat or fish stake 21 is main
Load-carrying members, plain stake 22 be soil-baffling structure, plain stake 22 fills up in the gap between meat or fish stake 21 to form continuous body of wall, by foundation ditch
The load transmission of the outer soil body is to meat or fish stake 21；Plain stake 22 only undertakes the effect of gear soil, therefore it need not be anchored in the stable soil body, only
Need embedment hole bottom a small amount of depth below 6.
The top of taper pile wall 2 is provided with Guan Liang 4, Guan Liang 4 connects the top of all meat or fish stakes 21 and plain stake 22, supporting pile 3
It is connected at Guan Liang 4 with the meat or fish stake 21 in taper pile wall 2.Guan Liang 4 is typically flush to nature ground 5 and arranges, and will be supported by Guan Liang 4
Stake 3 is connected as one with meat or fish stake 21, can be good at transmitting the extruding force that taper pile wall 2 is subject to, and makes whole foundation pit supporting construction more
Plus it is reliable and stable.
The wall thickness 800 of taper pile wall 2, using interlocking pile technique, the diameter 800 of supporting pile 3, using cast-in-situ bored pile, referring to Fig. 1.
Meat or fish stake 21 and the plain diameter of stake 22 are 800mm, mutually overlap 200mm.Meat or fish stake 21 is reinforced concrete pile, and sectional reinforcement is 16
20 worm steels, the long 15m of stake.Plain stake 22 is plain concrete pile, does not configure steel reinforcement cage, the long 10m of stake.Supporting pile 3 is mixed for reinforcing bar
The stake of solidifying soil, sectional reinforcement is 12 20 worm steels, the long 15m of stake, pile spacing 7.2m.Meat or fish stake 21 is with supporting pile 3 by arranging
Guan Liang 4 at natural ground 5 connects.The elongated setting of Guan Liang 4, is reinforced beam, and sectional dimension is 2000x600.
Embodiment 2
The construction method of the brace type foundation pit supporting construction of taper pile wall 2 in embodiment 1, it is characterised in that step is as follows：
Step one, form taper pile wall 2, and while supporting pile 3 of constructing in natural ground 5 construction meat or fish stake 21 and plain stake 22；
Step 2, after meat or fish stake 21, plain stake 22 and the construction of supporting pile 3 are finished, in meat or fish stake 21, plain stake 22 and supporting pile 3
Supporting pile 3 and taper pile wall 2 are connected as entirety by top construction Guan Liang 4；
Step 3, overall excavation pit all complete to bottom 6, pattern foundation pit supporting structure and earth excavation is cheated, and transfer civil engineering list
Position carries out basement structure construction.
Embodiment 3
The brace type foundation pit supporting construction of Double-layer oblique piling wall 2, on the basis of embodiment 1, is additionally provided with below taper pile wall 2
Second taper pile wall 23, the structure of the second taper pile wall 23 is identical with the structure of taper pile wall 2, and the top of the second taper pile wall 23 arranges waist rail
8, waist rail 8 is connected with the waist of supporting pile 3.The foundation ditch larger for depth, can adopt the scheme of the supporting of multilamellar taper pile wall 2.With
The depth of foundation ditch increases, and surrounding soil needs higher supporting construction to provide support force, and the structure of monolayer taper pile wall 2 cannot
Enough support force is provided, we are layered supporting using the structure of multilamellar taper pile wall 2, then by waist rail 8 and support column by multilamellar
Taper pile wall 2 connects into the support frame of an entirety, the soil body around foundation ditch is fixed and is supported.Each layer of taper pile wall 2 is not only propped up
The weight of the soil body above it is supportted, while will also play a part of anchoring, whole supporting construction foundation ditch week is firmly fixed on into
In the soil body for enclosing, prevent it from toppling.
As shown in Fig. 2 agent structure is planned to build in foundation ditch for underground two-layer, and excavation of foundation pit depth 11m, 120 meters of plane span,
Deformation control of foundation pit is required stricter.Pattern foundation pit supporting structure overall plan adopts the supporting type foundation pit supporting construction of Double-layer oblique piling wall 2.
Two-layer taper pile wall 2, wall thickness 900, using interlocking pile technique, the diameter 1000 of supporting pile 3, using brill are set from top to bottom
Hole pouring pile, referring to Fig. 2.Meat or fish stake 21 and the plain diameter of stake 22 are 900mm, mutually overlap 200mm.Meat or fish stake 21 is armored concrete
Stake, sectional reinforcement is 16 22 worm steels, and 21 long 19m of meat or fish stake of taper pile wall 2, the meat or fish stake 21 of the second taper pile wall 23 is long
15m.Plain stake 22 is plain concrete pile, does not configure steel reinforcement cage, the long 6.5m of stake of the plain stake 22 of taper pile wall 2, the second taper pile wall 23
The long 7.5m of stake of plain stake 22.Supporting pile 3 be reinforced concrete pile, sectional reinforcement be 14 22 worm steels, the long 20m of stake,
Away from 7m.The meat or fish stake 21 of taper pile wall 2 is connected with supporting pile 3 by being arranged on the Guan Liang 4 at nature ground 5, the second taper pile wall 23
Meat or fish stake 21 is connected with supporting pile 3 by being arranged on the waist rail 8 of middle excavation face 9.Guan Liang 4 and waist rail 8 are elongated setting, are
Reinforced beam, the sectional dimension of Guan Liang 4 is 2000x600, and the sectional dimension of waist rail 8 is 1500x500.
Embodiment 4
The construction method of the brace type foundation pit supporting construction of taper pile wall 2 in embodiment 3, step is as follows：
Step one, taper pile wall 2, and supporting pile 3 of constructing are formed in natural ground 5 construction meat or fish stake 21 and plain stake 22, while applying
The second taper pile of work wall 23, bear 12 is set to staying between natural ground 5 in the stake top of meat or fish stake 21 and the plain stake 22 of the second taper pile wall 23；
Step 2, after step one construction is finished, meat or fish stake 21, plain stake 22 and supporting pile 3 top construction Guan Liang 4 will
Hold stake 3 and taper pile wall 2 is connected as entirety；
Step 3, excavation pit are to middle excavation face 9, and the height of middle excavation face 9 is neat with the position height of waist rail 8
Flat, the second taper pile wall 23 is connected as entirety by waist rail 8 of constructing with supporting pile 3；
Step 4, foundation ditch bottom 6 is excavated to, pattern foundation pit supporting structure and earth excavation all complete, transferring civil engineering unit is carried out
Basement structure construction.
These are only presently preferred embodiments of the present invention, not to limit the present invention, all spirit in the present invention and
Any modification, equivalent and improvement for being made within principle etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of taper pile wall brace type foundation pit supporting construction, it is characterised in that：The taper pile wall brace type foundation pit supporting construction bag
Taper pile wall, supporting pile and Guan Liang are included, the taper pile wall is obliquely installed, towards foundation ditch inner inclination at the top of taper pile wall, taper pile wall
In the soil body outside the oblique entrance foundation ditch in bottom, the supporting pile be vertically arranged at taper pile wall top lower section, supporting pile top with it is oblique
Piling wall top is connected, and supporting pile bottom is arranged in the soil body of bottom of foundation ditch.
2. as claimed in claim 1 a kind of taper pile wall brace type foundation pit supporting construction, it is characterised in that：The inclination of the taper pile wall
Angle is 10 °~30 °.
3. as claimed in claim 1 a kind of taper pile wall brace type foundation pit supporting construction, it is characterised in that：The taper pile wall is by mutual
The continuous body of wall of the taper pile composition of occlusion overlap joint, the taper pile includes meat or fish stake and plain stake, wherein meat or fish stake configuration reinforcement cage, is reinforcing bar
Concrete-pile, plain stake does not configure steel reinforcement cage, is plain concrete pile.
4. as claimed in claim 3 a kind of taper pile wall brace type foundation pit supporting construction, it is characterised in that：The length of the meat or fish stake is big
In the length of the plain stake, meat or fish passes through obliquely downwards Potential failure surface, in anchoring into the stable soil body below Foundation Pit bottom, the element
Stake is arranged in the interval between meat or fish stake, and with meat or fish stake overlap joint is engaged.
5. as claimed in claim 4 a kind of taper pile wall brace type foundation pit supporting construction, it is characterised in that：Set in taper pile coping
Guan Liang is equipped with, the Guan Liang connects the top of all meat or fish stakes and plain stake, and the meat or fish stake in the supporting pile and taper pile wall is in the hat
Liang Chu connects.
6. as claimed in claim 5 a kind of taper pile wall brace type foundation pit supporting construction, it is characterised in that：The taper pile wall lower section is also
The second taper pile wall is provided with, the structure of the second taper pile wall is identical with the structure of taper pile wall, the second taper pile coping
Waist rail is set, and the waist rail is connected with the waist of supporting pile.
7. the construction method of taper pile wall brace type foundation pit supporting construction described in a kind of claim 3, it is characterised in that step is as follows：
Step one, form taper pile wall, and while supporting pile of constructing in the stake of natural ground construction meat or fish and plain stake；
Step 2, after meat or fish stake, plain stake and supporting pile driving construction are finished, will in the top construction Guan Liang of meat or fish stake, plain stake and supporting pile
Supporting pile and taper pile wall are connected as entirety；
Step 3, overall excavation pit all complete to bottom, pattern foundation pit supporting structure and earth excavation is cheated, and transferring civil engineering unit is carried out
Basement structure construction.
8. the construction method of taper pile wall brace type foundation pit supporting construction described in a kind of claim 6, it is characterised in that step is as follows：
Step one, taper pile wall, and supporting pile of constructing are formed in the stake of natural ground construction meat or fish and plain stake, while the second taper pile of constructing
Wall, bear is set to staying between natural ground in the stake top of meat or fish stake and the plain stake of the second taper pile wall；
Step 2, after step one construction is finished, meat or fish stake, plain stake and supporting pile top construction Guan Liang by supporting pile and taper pile
Wall is connected as entirety；
, to middle excavation face, the height of middle excavation face is flushed with the position height of waist rail, is applied for step 3, excavation pit
Work waist rail, by the second taper pile wall and supporting pile entirety is connected as；
Step 4, foundation ditch bottom is excavated to, pattern foundation pit supporting structure and earth excavation all complete, transferring civil engineering unit carries out basement
Structure construction.
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| CN113529730A (en) * | 2021-07-28 | 2021-10-22 | 中建八局天津建设工程有限公司 | Construction method of foundation pit |
| CN115262573A (en) * | 2022-07-13 | 2022-11-01 | 上海勘察设计研究院(集团)有限公司 | Combined type multilayer vertical self-stabilizing enclosure structure and construction method |
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