CN105862874A - Protection method for controlling deformation of building structure close to foundation pit - Google Patents
Protection method for controlling deformation of building structure close to foundation pit Download PDFInfo
- Publication number
- CN105862874A CN105862874A CN201610231358.4A CN201610231358A CN105862874A CN 105862874 A CN105862874 A CN 105862874A CN 201610231358 A CN201610231358 A CN 201610231358A CN 105862874 A CN105862874 A CN 105862874A
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- China
- Prior art keywords
- gasbag
- structures
- deformation
- excavation
- foundation ditch
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Classifications
-
- 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
- E02D1/00—Investigation of foundation soil in situ
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
Abstract
The invention relates to a protection method for controlling deformation of a building structure close to a foundation pit. The protection method comprises the following steps that (1) a soil pressure meter is buried in the side, close to the building structure, of a foundation, a foundation pit deformation inclinometer tube is buried in the side close to the foundation pit, and settlement observation points are distributed on the building structure; (2) holes are vertically drilled between the foundation pit and the building structure, air bags capable of being inflated/grouted are guided into the drilling holes through guide pipes, and the orifice sections are sealed; (3) when the foundation pit is excavated, pressurizing equipment is started according to the situations of soil pressure, surrounding ground displacement and settlement changes of the building structure, and the air bags are inflated by opening an air guide pipe so as to conduct pressure compensation on unloading caused by excavation; and (4) after excavation of the foundation pit is completed, the air bags are deflated one by one, grouting is conducted at the same time, and a pile body with certain rigidity is formed. The protection method has the advantages of being high in construction speed, high in adaptability, high in efficiency, small in disturbance, low in cost and the like, and is a very effective settlement control protection method.
Description
Technical field
The invention belongs to foundation pit construction technical field, concretely relate to a kind of control and close on base
The means of defence of hole construction of structures deformation.
Background technology
In recent years, the urban construction and development of China is abnormal rapidly, and underground engineering gets more and more, and gushes
Reveal substantial amounts of base pit engineering.These deep big foundation pit surroundings being positioned at down town are gathered all kinds of
Underground utilities, close on the facilities such as all kinds of construction of structures and subway tunnel.Owing to down town is the biggest
Foundation pit construction narrow field, the construction period is tight, excavation of foundation pit is deep (degree of depth is generally 15～25m),
Excavation of foundation pit area is big, and execution conditions are complicated；In addition the stratum residing for engineering is essentially saturated containing
Current are moulded or soft plastic clay layer, and hole when compressibility is big, shearing strength is low, sensitivity is high
Feature.The off-load of deep basal pit inevitably results in the stress field of foundation ditch and surrounding soil and changes,
Foundation ditch and foundation ditch surrounding soil strata deformation cause the uplift of soil in foundation ditch, the side of building enclosure
To deformation and the sedimentation on foundation ditch periphery earth's surface.And in soft clay area deep pit excavation, not only want
Meet intensity and the safety and stability of deep basal pit itself, but also caused by deep pit digging to be controlled
Deformation and generation cheat outer earth's surface sedimentation, with the requirement of satisfied protection surrounding enviroment.
At present, employing routine isolation pile technical protection closes on the method for the construction of structures of excavation pit
Obtain certain application, but when excavation of foundation pit has resulted in the construction of structures closing on excavation pit
When sedimentation and deformation is excessive, conventional isolation pile technology just loses effect；It addition, when closing on excavation base
When the construction of structures in hole uses pile foundation, also there is employing (i.e. away from foundation ditch side) outside isolation pile
The protected mode of grouting and reinforcing, but the method is not suitable for shallow foundation facility, because noting outside stake
The main purpose of slurry is to improve the side frictional resistance of the construction of structures pile foundation being closed on excavation pit by protection
Power, improves its pile foundation non-deformability, and under shallow foundation facility, direct slip casting can cause on the contrary
Lift on building is uneven, cause bulge fracture.
It addition, double-row pile technology has obtained certain development in recent years, at next-door neighbour's existing building base
Hole slope retaining has some superiority, but Double-row Piles Support is relatively costly, the pattern foundation pit supporting structure degree of depth
Also having certain limitations, supporting safety coefficient is relatively low, and the construction of rear campshed is by the environment shadow after side slope
Ring bigger.
In sum, it is provided that a kind of means of defence controlling closing foundation ditch construction of structures deformation is this
One important technological problems of skilled person.
Summary of the invention
In order to overcome defect present in prior art, the invention provides one and be prone to construction,
Can control to close on the means of defence of excavation pit construction of structures deformation, close on excavation in order to protect
Foundation ditch construction of structures.
A kind of means of defence controlling closing foundation ditch construction of structures deformation, comprises the following steps:
(1) in the ground of construction of structures side, earth pressure gauge is being buried underground, near foundation ditch one
Side buries foundation pit deformation inclinometer pipe underground, and lays settlement observation point in construction of structures；
(2) vertically hole near foundation ditch side between foundation ditch and existing construction of structures,
After pore-forming, utilizing guide pipe to be imported in boring by the gasbag of inflatable/slip casting, aperture section is entered
Row seals；
(3) at excavation of foundation pit simultaneously, according to soil pressure, surrounding soil displacement and construction of structures
Sedimentation situation of change, starts pressurized equipment, opens airway and be inflated gasbag, is formed
One Exhaust airbag post, carries out pressure compensation with the off-load causing excavation；
(4) after excavation of foundation pit completes, one by one the air in release air bag, is carried out simultaneously
Slip casting, forms the pile body with certain rigidity.
The setting of settlement observation point of the present invention should be by designing unit according to the engineering of ground
The feature of geologic information and building structure determines, the mark burial place of settlement observation point should simultaneously
Sight line is open, does not block.
As preferably, if described foundation ditch is spaced setting arterial highway cross-brace, described horizontal stroke from top to bottom
Fluid pressure type telescopic pole is used and in uniformly laying to strut.Its quantity is according to construction of structures
Long (wide) degree determines.
As preferably, boring aperture controls 100～300mm.Forming hole method does not limits.
As preferably, the gasbag of inflatable/slip casting uses the cloth bag of geotechnique's sealed air-tight；
The colligation of two ends up and down of described gasbag is on guide pipe, and gasbag upper end colligation point is away from guide pipe
Upper port 2～3m, imports in boring by guide pipe by gasbag, and gasbag imports in boring
After, utilize bentonite to seal in the range of its aperture section 2～3 meters；Gasbag sends into boring
It being carried out sealing propertytest, in the excavation stage, the valve of the exhaustor of gasbag is all the time before
It is closed.
As preferably, guide pipe is steel pipe or the PE pipe with certain diameter, and internal diameter controls
100～200mm；Guide pipe bassets and is partly connected with subtube, and guide pipe passes air bag
Part in Dai, perforate in the range of its pipe shaft bottom 1/2, aperture 50mm；Guide pipe hypomere
Stretch out gasbag certain length, its sealed bottom.Guide pipe can also serve as gas tube and Grouting Pipe,
Gas or serosity can enter gasbag by the eyelet on guide pipe.
As preferably, through the soil body sliding area foundation ditch and surrounding building bottom gasbag
And embed the solum of bottom, soil body sliding area.
As preferably, earth pressure gauge is embedded between excavation pit and vertically disposed gasbag,
The depth of burying determines according to the position of each excavation face during excavation of foundation pit；Described foundation pit deformation deviational survey
Pipe is embedded between excavation pit and vertically disposed gasbag and is located close to foundation ditch side.
As preferably, described earth pressure gauge buries two rows underground in excavation base along excavation of foundation pit depth direction
Between hole and vertically disposed gasbag；Wherein a casting piezometer is vertically buried underground, another draining
Put down and bury underground；Described soil pressure meter is connected with real-time monitoring system.The earth pressure gauge vertically buried underground is used
It is used for measuring vertical earth pressure to soil pressure, horizontally embedded earth pressure gauge in the level of measurement.
As preferably, described guide pipe is connected with pressurized equipment, and described pressurized equipment is air
Compressor or grouting equipment.Realize inflating in pneumatophore by air compressor, pass through slip casting
Equipment realizes slip casting in pneumatophore.
As preferably, the top of vertically disposed pneumatophore is by the steel pipe preset in the coupling beam of top
Flexibly connect with top coupling beam.
The beneficial effects of the present invention is:
(1) this means of defence use the gasbag of inflatable/slip casting be inflated/slip casting, energy
Uniformly diffuse to inflation/grouting pressure be protected in the foundation soil under construction of structures, can avoid
Lift protuberance on the direct construction of structures that slip casting causes in ground is uneven, reduce the wave of slurry
Take；
(2) grouting pressure, slip casting can be adjusted according to earth pressure gauge and Excavation Settlement measured result
Amount and slip casting progress, carried out the Stress Release of the surrounding soil caused due to excavation of foundation pit in time
Compensate, to control periphery construction of structures sedimentation, effectively reduce excavation of foundation pit and the construction closed on is built
The disturbance of thing；
(3) can be by improving the body surface that the shear resistance of slide surface is provided with structure self
Collateral resistance and rigidity limit the development of deformation of the soil body after means of defence, build after reducing means of defence
The sedimentation of structures and deformation；
(4) certain anti-floating bearing capacity can be provided；
(5) simple for production, speed of application is fast, and strong adaptability, efficiency are high, low cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the vertically disposed inflatable/slip casting bag plane of arrangement schematic diagram of the present invention；
Fig. 3 is the structural representation of inflatable/slip casting bag.
Detailed description of the invention
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but institute of the present invention
Scope of protection is not limited to this.
With reference to Fig. 1～3, a kind of means of defence controlling closing foundation ditch construction of structures deformation, bag
Include following steps:
(1) in the ground of construction of structures 2 side, earth pressure gauge 6 is being buried underground, near base
Cheat 1 side and bury foundation pit deformation inclinometer pipe 7 underground, and in construction of structures, lay settlement observation point 8,
And carry out initial settlement observation, using the control reference as subsequent construction；Settlement observation point
Setting should be determined according to the engineering geological data of ground and the feature of building structure by designing unit,
The mark burial place of settlement observation point answers sight line open simultaneously, does not block；
Earth pressure gauge 6 is embedded between excavation pit 1 and vertically disposed gasbag 9, buries underground
The degree of depth determines according to the position of each excavation face during excavation of foundation pit；Described foundation pit deformation inclinometer pipe 7
It is embedded between excavation pit 1 and vertically disposed gasbag 9 and is located close to foundation ditch 1 one
Side；Concrete, described earth pressure gauge 6 buries two rows underground in excavation base along excavation of foundation pit depth direction
Between hole and vertically disposed gasbag；Wherein a casting piezometer is vertically buried underground, is used for measuring
Level is to soil pressure, and another row of horizontal is buried underground, is used for measuring vertical earth pressure；Described soil pressure meter
It is connected with real-time monitoring system.
(2) building enclosure 4 is set intending excavation pit avris, simultaneously foundation ditch 1 with close on
Vertically hole near foundation ditch 1 side between excavation pit construction of structures 2, boring aperture control
System, 100～300mm, after pore-forming, utilizes guide pipe 10 by the gasbag of inflatable/slip casting
9 import in boring, carry out sealing formation with bentonite and seal in the range of aperture section 2～3 meters
Section 3, it is ensured that exhaustor 11 upper valve of gasbag 9 is closed；
The gasbag 9 of inflatable/slip casting uses the cloth bag of geotechnique's sealed air-tight, described air bag
The colligation of two ends up and down of bag is on guide pipe 10, and gasbag upper end colligation point is away from guide pipe upper end
Mouth 2～3m；Gasbag carries out sealing propertytest to it before sending into boring, in the excavation stage,
The valve of the exhaustor 11 of gasbag is closed all the time；
Guide pipe 10 is to have the steel pipe of certain diameter or PE pipe, internal diameter control 100～
200mm；Guide pipe bassets and is partly connected with subtube 16, and guide pipe passes gasbag
Interior part, perforate in the range of its pipe shaft bottom 1/2, aperture 50mm；Guide pipe hypomere is stretched
Go out gasbag 60cm, its sealed bottom；Guide pipe 10 can also serve as gas tube and Grouting Pipe, gas
Body or serosity can enter gasbag 9 by the eyelet 12 on guide pipe；
The pneumatophore 9 of described inflatable/slip casting is positioned close to foundation ditch 1 side, bottom it
Through described foundation ditch 1 and the soil body sliding area closed on excavation pit construction of structures 2, and deeply
Enter in the solum of bottom, soil body sliding area；Described foundation ditch 1 in digging process from top to bottom between
If every arranging arterial highway cross-brace 5, described cross struts use fluid pressure type telescopic pole and in
Uniformly lay.
(3) at excavation of foundation pit simultaneously, according to soil pressure, surrounding soil displacement and construction of structures
Sedimentation situation of change, is inflated maintaining pressure stability；Guide pipe 10 is (empty with pressurized equipment 14
Air compressor) it is connected, start air compressor, open airway and gasbag 9 is filled
Gas, making the gasbag 9 of inflatable/slip casting, micro-swollen (before excavation of foundation pit completes, guide pipe begins
It is connected with pressurized equipment eventually, keeps the pressure after inflating each time steady in this process
Fixed), form an Exhaust airbag post, gasbag 9 volumetric expansion of inflatable/slip casting is formed to be had relatively
Major diameter and the pile body of certain rigidity, and adjust gas according to soil pressure and Excavation Settlement measured result
Pressure in pouch, is carried out the Stress Release of the surrounding soil caused due to excavation of foundation pit in time
Compensate；
The pneumatophore 9 of inflatable/slip casting can be according to condition of construction by pressurized equipment 14 (air
Compressor/grouting equipment) it is allowed to full to swelling with total pipeline 15, subtube 16, simultaneously can
The real-time pressure of each pneumatophore is known in real time, it is achieved to each by real-time monitoring system 17
Control alone or in combination, easy and simple to handle；
The pneumatophore 9 of vertically disposed inflatable/slip casting, its end utilizes and flexibly connects one
Rise, and casting concrete, at earth's surface, form entirety；So, can improve vertically disposed
The integral rigidity of the pneumatophore 9 of inflatable/slip casting, thus reduce foundation pit construction further to facing
The impact of nearly excavation pit construction of structures 2；
The pneumatophore 9 of vertically disposed inflatable/slip casting is primarily subjected to excavation pit 1 excavation and executes
Soil lateral pressure that work causes and the frictional resistance that ground relative settlement produces, and vertically disposed
The pneumatophore 9 of inflatable/slip casting can reduce to a certain extent and acts on excavation pit 1
Soil pressure in building enclosure 4；When the soil body produces sliding deformation, pass through real-time monitoring system
17 inflate/slip casting to the pneumatophore 9 of vertically disposed inflatable/slip casting, by improving slide surface
Shear resistance and the pile side resistance that provides of pile body and rigidity to limit the deformation of the soil body after stake
Development, thus by sedimentation and the deformation of protection Architectural Equipment after reducing stake；
The closely connected arranged of pneumatophore 9 of vertically disposed inflatable/slip casting, each pneumatophore
There is the most independent guide pipe 10, exhaustor 11, corresponding valve and respective real-time prison
Examining system 17 (Pressure gauge).By to its inflation/slip casting, pneumatophore is made to form inflation/slip casting
Utricule, it is possible to uniformly diffuse to close on excavation pit construction of structures 2 times by inflation/grouting pressure
Foundation soil in, can avoid directly in ground inflation/slip casting cause close on excavation pit
Protuberance is lifted on construction of structures 2 is uneven.
(4) after excavation of foundation pit completes, one by one the air in release air bag, is carried out simultaneously
Slip casting, forms the pile body with certain rigidity；Concrete, total valve is closed, by total pipeline
It is removed and connected to from air compressor on grouting equipment, opens total valve, slowly beat simultaneously
Drive the exhaustor 11 of the pneumatophore 9 of inflation/slip casting, make slurry slowly be full of bag；The row for the treatment of
After trachea 11 has slurry to overflow a period of time, i.e. it is believed that the pneumatophore 9 of this inflation/slip casting
Already filled with, now close the valve in respective branch；Pneumatophore 9 in all inflation/slip castings
After all filling slurry, the pneumatophore 9 of inflation/slip casting is carried out sealing of hole, and to all vertical rows
The top of the pneumatophore of row is flexibly connected with top coupling beam by the steel pipe preset in the coupling beam of top.
The present invention is inflatable/and the gasbag volumetric expansion of slip casting is formed has larger diameter and certain
The pile body of rigidity, and can open due to foundation ditch according to soil pressure and foundation pit deformation sedimentation measured result
The Stress Release digging the surrounding soil caused compensates, to control periphery construction of structures sedimentation,
Effectively reduce the disturbance of the excavation of foundation pit construction of structures to closing on.The present invention solves closing foundation ditch
The problem that construction of structures settlement Control is difficult, overcomes other means of defences and there is cost height, disturbance
The defects such as big and efficiency is low.The present invention has that speed of application is fast, strong adaptability, real-time, effect
Rate is high, disturbance is little, low cost and other advantages, is a kind of very effective settlement Control means of defence.
Claims (10)
1. the means of defence controlling closing foundation ditch construction of structures deformation, it is characterised in that include following
Step:
(1) in the ground of construction of structures side, burying earth pressure gauge underground, burying near foundation ditch side
If foundation pit deformation inclinometer pipe, and in construction of structures, lay settlement observation point；
(2) vertically hole near foundation ditch side between foundation ditch and existing construction of structures, pore-forming
After, utilize guide pipe to be imported in boring by the gasbag of inflatable/slip casting, aperture section carries out close
Envelope；
(3) at excavation of foundation pit simultaneously, settle according to soil pressure, surrounding soil displacement and construction of structures
Situation of change, starts pressurized equipment, opens airway and be inflated gasbag, and shape is in a row
Air bag post；
(4) after excavation of foundation pit completes, one by one the air in release air bag, carries out slip casting simultaneously,
Form the pile body with certain rigidity.
The means of defence of control closing foundation ditch construction of structures the most according to claim 1 deformation, its
It is characterised by: if described foundation ditch is spaced setting arterial highway cross-brace, described horizontal support from top to bottom
Bar uses fluid pressure type telescopic pole and in uniformly laying.
The means of defence of control closing foundation ditch construction of structures the most according to claim 1 deformation, its
It is characterised by: boring aperture controls 100～300mm.
The means of defence of control closing foundation ditch construction of structures the most according to claim 1 deformation, its
It is characterised by: the gasbag of inflatable/slip casting uses the cloth bag of geotechnique's sealed air-tight；Described
The colligation of two ends up and down of gasbag is on guide pipe, and gasbag upper end colligation point is away from guide pipe upper end
Mouth 2～3m, imports in boring by guide pipe by gasbag, after gasbag imports in holing,
Bentonite is utilized to seal in the range of its aperture section 2～3 meters；Before gasbag sends into boring
It is carried out sealing propertytest, and in the excavation stage, the valve of the exhaustor of gasbag is in all the time
Closed mode.
The means of defence of control closing foundation ditch construction of structures the most according to claim 1 deformation, its
Be characterised by: guide pipe is to have the steel pipe of certain diameter or PE pipe, internal diameter control 100～
200mm；Guide pipe bassets and is partly connected with subtube, and guide pipe passes in gasbag
Part, perforate in the range of its pipe shaft bottom 1/2, aperture 50mm；Guide pipe hypomere stretches out gas
Pouch certain length, its sealed bottom.
The means of defence of control closing foundation ditch construction of structures the most according to claim 1 deformation, its
It is characterised by: through the soil body sliding area foundation ditch and surrounding building embedding bottom gasbag
Enter the solum of bottom, soil body sliding area.
The means of defence of control closing foundation ditch construction of structures the most according to claim 1 deformation, its
It is characterised by: earth pressure gauge is embedded between excavation pit and vertically disposed gasbag, buries underground
The degree of depth determines according to the position of each excavation face during excavation of foundation pit；Described foundation pit deformation inclinometer pipe buries
It is located between excavation pit and vertically disposed gasbag and is located close to foundation ditch side.
The means of defence of control closing foundation ditch construction of structures the most according to claim 7 deformation, its
Be characterised by: described earth pressure gauge along excavation of foundation pit depth direction bury underground two rows in excavation pit with
Between vertically disposed gasbag；Wherein a casting piezometer is vertically buried underground, and another row of horizontal is buried
If；Described soil pressure meter is connected with real-time monitoring system.
The means of defence of control closing foundation ditch construction of structures the most according to claim 1 deformation, its
Being characterised by: described guide pipe is connected with pressurized equipment, described pressurized equipment is air compression
Machine or grouting equipment.
The means of defence of control closing foundation ditch construction of structures the most according to claim 1 deformation,
It is characterized in that: the top of vertically disposed pneumatophore by the steel pipe preset in the coupling beam of top with
Top coupling beam flexibly connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610231358.4A CN105862874B (en) | 2016-04-14 | 2016-04-14 | A kind of means of defence for controlling closing foundation ditch construction of structures to deform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610231358.4A CN105862874B (en) | 2016-04-14 | 2016-04-14 | A kind of means of defence for controlling closing foundation ditch construction of structures to deform |
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| CN105862874A true CN105862874A (en) | 2016-08-17 |
| CN105862874B CN105862874B (en) | 2017-09-19 |
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ID=56637828
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| CN113431110A (en) * | 2021-07-14 | 2021-09-24 | 中国矿业大学 | Active protection method for eliminating influence of stratum settlement on existing building |
| CN113463619A (en) * | 2021-07-07 | 2021-10-01 | 中铁大桥勘测设计院集团有限公司武汉分公司 | Self-adaptation subtracts bloated dissipation structure |
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