CN108842829A - Automatic hydraulic power balance stability against floating structure and method during Underground Construction - Google Patents
Automatic hydraulic power balance stability against floating structure and method during Underground Construction Download PDFInfo
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- CN108842829A CN108842829A CN201810884868.0A CN201810884868A CN108842829A CN 108842829 A CN108842829 A CN 108842829A CN 201810884868 A CN201810884868 A CN 201810884868A CN 108842829 A CN108842829 A CN 108842829A
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- 238000010276 construction Methods 0.000 title claims abstract description 53
- 238000007667 floating Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000004567 concrete Substances 0.000 claims abstract description 31
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000001914 filtration Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 239000003673 groundwater Substances 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 claims 1
- 230000008569 process Effects 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 239000002352 surface water Substances 0.000 description 4
- 239000004746 geotextile Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 206010003830 Automatism Diseases 0.000 description 1
- 206010052428 Wound Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
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- 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
- E02D31/02—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 against ground humidity or ground water
-
- 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
- E02D31/10—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 against soil pressure or hydraulic pressure
- E02D31/12—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 against soil pressure or hydraulic pressure against upward hydraulic pressure
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses automatic hydraulic power balance stability against floating structure and method, methods during a kind of Underground Construction to include：Plain concrete cushion layer and paving waterproof roll are set on the ground of default Foundation Pit bottom, pours and smashes underground structure reinforced concrete foundation and underground structure bottom plate；The cast-in-place side wall of first layer reserving hole is set on underground structure bottom plate；The cast-in-place side wall of the second layer is set in the outside, inside or two sides of the cast-in-place side wall of first layer, and the cast-in-place side wall of first layer and the cast-in-place side wall of the second layer are overlapped；After the cast-in-place side wall of first layer and the second layer cast-in-place side wall overlapping, paving water-tight device and foundation pit is backfilled in time on the cast-in-place side wall of the second layer.It is safe and reliable in structure of the invention；Project cost can be greatly lowered；Working procedure is simply convenient for operating；Applicability is extensive, can cross applied to the construction of underground structure stability against floating measure under various forms, various section configurations and size, various construction methods, various complicated geological environments, various operation sides and various complex working conditions.
Description
Technical field
The present invention relates to technical field of civil engineering, specifically, waterpower during in particular to a kind of Underground Construction
Autobalance stability against floating structure and method.
Background technique
The nearly more than ten years with reform and opening-up further in-depth, the development of China's economic crossover formula driven urbanization into
Journey.The quickening of urbanization process also brings a series of problem, for example urban population is intensive, traffic deterioration, environmental pollution etc.
"urban disease".To solve problems faced in above-mentioned urbanization process, large-scale develops and utilizes the underground space and become city and determine
Inevitable the wanted problems faced of plan person.
Underground structure construction period due to the attached superstructure for building formula underground structure or free-standing underground structure just
Top backfill is in progress, causes underground structure vertical load insufficient, then the stability against floating of its construction period just becomes city
The outstanding problem that city builder faces.
Currently, the traditional measure of anti float of China's underground structure include on underground structure interim preloading or setting uplift pile,
Anti-float anchor rod etc..However, China is still in the exploratory stage for the development and utilization of the underground space, the anti-floating mechanism of underground structure is still
Indefinite, the engineering geology in place and hydrogeology are more complicated especially where underground structure, and engineers and technicians do not have
Full and accurate reliable engineering geology hydrogeologic data can use for reference reference.For the selection of hydrostatic water table mostly with work in engineering design
Based on the subjective experience judgement of journey technical staff, so that (economy is unreasonable) is relatively guarded in design or there are relatively strong winds
Danger (safety is insufficient).
During Underground Construction the exceedingly odious weather such as underground water substantial increase or heavy rain, mountain torrents belong to
Machine process, the event that large-scale underground water or surface water pour in foundation pit during Underground Construction resulting from are possible to
It will not occur, and at present for stability against floating considers and carries out preloading or setting uplift pile, anti-float anchor rod etc. on underground structure and passes
The measure of anti float of system passive type not only causes great economic waste but also will cause claim for eot.
At present for stability against floating considers and carries out preloading ballast or setting uplift pile, anti-float anchor rod etc. on underground structure and passes
The disadvantages of measure of anti float of system passive type has be easy to cause great economic waste or construction delay.
Summary of the invention
In order to solve problems in the prior art, the embodiment of the invention provides hydraulic automatisms during a kind of Underground Construction
Balance stability against floating structure and method.The technical solution is as follows：
On the one hand, a kind of automatic hydraulic power balance stability against floating method during Underground Construction is provided, including：
Plain concrete cushion layer and paving waterproof roll are set on the ground of default Foundation Pit bottom, pour that smash underground structure reinforcing bar mixed
Solidifying earth foundation and underground structure bottom plate；
The cast-in-place side wall of first layer is set on the underground structure bottom plate；
The cast-in-place side wall of the second layer is set in the outside, inside or two sides of the cast-in-place side wall of the first layer, and by described first
The cast-in-place side wall of layer and the cast-in-place side wall overlapping of the second layer；
After the cast-in-place side wall of the first layer and the cast-in-place side wall of the second layer overlap, the paving on the cast-in-place side wall of the second layer
Water-tight device.
Further, the step of cast-in-place side wall of first layer is arranged on the underground structure bottom plate be specially：
Meet and is poured under the requirement of underground structure side wall serviceability limit state and ultimate limit states design thickness
Smash the cast-in-place side wall of underground structure reinforced concrete structure first layer；
The reserving hole on the cast-in-place side wall of the first layer；
The cast-in-place side wall of first layer pours smash maintenance after the completion of, the cast-in-place side wall of the first layer one or both sides be arranged
The interim filtration material such as geotextiles；
Further, the cast-in-place side wall of the second layer is arranged in the outside, inside or two sides in the cast-in-place side wall of the first layer,
And the step of overlapping the cast-in-place side wall of the first layer and the second layer cast-in-place side wall, is specially：
The anti-floating during the Superstructure Construction completion of underground structure or the backfill load right above it meet operation use
After stable requirement, the interim filtration material being arranged on the cast-in-place side wall of first layer is removed；
The concrete for pouring the one or both sides of the cast-in-place side wall of underground structure first layer afterwards forms second layer cast-in-place concrete side
Wall makes the first pouring concrete part of underground structure side wall pour part reinforced concrete wall with after and is superimposed together to form overlapping wall association
Same stress；
Further, described after the cast-in-place side wall of the first layer and the second layer cast-in-place side wall overlapping, in the second layer
Paving water-tight device is specially on cast-in-place side wall：
When after pour the concrete curing of part after the completion of, simultaneously to the side wall paving one or both sides waterproof roll of underground structure
Backfill foundation pit in time.
Further, a kind of automatic hydraulic power balance stability against floating method during Underground Construction further includes：On side wall
Reserving hole, the shape of hole can be round, square, rectangle or other shapes, size, quantity and the spacing of hole and answer
Meet sidewall structure intensity, deformation and the underground water not influenced when level of ground water sharply increases outside side wall to pour in underground structure
Portion is advisable, and away from substrate, a nearest round hole should meet when water level rises by formula (1) stability against floating requirement；
The formula (1) is specially：
In formula：GkIt is self-possessed for first cast-in-place underground structure, unit kN；Nw,kFor buoyancy value, unit kN；KwFor
Stability against floating safety coefficient can use 1.05 under normal circumstances.
On the other hand, automatic hydraulic power balance stability against floating structure and method during a kind of Underground Construction, packet are provided
It includes：Default foundation pit, the cast-in-place bottom plate of underground structure, the cast-in-place side wall of first layer, underground structure casting top slab, the cast-in-place side wall of the second layer with
And foundation pit side-wall；
The underground structure bottom plate is set to the bottom of underground structure, and the underground structure top board is set to the underground knot
The top of structure；The underground structure bottom plate is connect by the cast-in-place side wall of the first layer with the underground structure top board；Described
Reserving hole is provided on one layer of cast-in-place side wall；The cast-in-place side wall of the second layer is set to the outer of the cast-in-place side wall of the first layer
Side, inside or two sides are arranged simultaneously；
The foundation pit side-wall is set to around the cast-in-place side wall of the first layer and the cast-in-place side wall of the second layer, the foundation pit side
Wall is inclination or upright side wall.
Further, plain concrete cushion layer and paving waterproof roll are provided on the default Foundation Pit bottom ground.
Further, the shape of the reserving hole can be round, square or rectangle, arrangement form and can be
Rectangle is quincunx.
Further, the junction of the cast-in-place side wall of the first layer and the cast-in-place side wall of the second layer is provided with shear reinforcement
Or steel bar girder.
Further, the cast-in-place side wall profile type of the first layer of the underground structure can for "] " type, " [" type, " ︱ " type
Or " I " type.
Technical solution bring beneficial effect provided in an embodiment of the present invention is：
The present invention provides automatic hydraulic power balance stability against floating construction methods during a kind of cut and cover method Underground Construction.It should
Method can construction period not under by the exceedingly odious weather condition such as variation of groundwater dynamic or heavy rain, mountain torrents under the influence of cause
Underground water or surface water pour in foundation pit on a large scale to the catastrophic event that causes underground structure to float.It can be effectively
Solve the problems, such as the stability against floating of underground structure.The invention belongs to a kind of underground structure stability against floating construction parties that Almightiness type is active
Method, no matter whether the exceedingly odious weather such as substantial increase or heavy rain, mountain torrents occurs pacify construction period level of ground water
Entirely, it economically copes with.
Belong to chance event in view of the event to float during Underground Construction, therefore proposed by the present invention a kind of complete
Can the active underground structure stability against floating construction method of type be able to solve the Underground Construction in various situations during it is anti-
Floating stable problem.Its advantage has the following：1. safe and reliable in structure；2. project cost can be greatly lowered；3. constructing
Process is simply convenient for operating；4. influencing to ignore on the duration, it is smaller 5. to influence on other working procedures；6. applicability is extensive, energy
It crosses and makees applied to various forms, various section configurations and size, various construction methods, various complicated geological environments, various constructions
Construction of underground structure stability against floating measure under industry face and various complex working conditions.
Therefore the present invention can save extensive fund in stability against floating consideration during Underground Construction, shorten the construction period,
It is a kind of underground structure stability against floating strategy being worthy of popularization.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 be the embodiment of the present invention Underground Construction during automatic hydraulic power balance stability against floating method method flow
Figure；
Fig. 2 be the embodiment of the present invention Underground Construction during automatic hydraulic power balance stability against floating structure underground structure
Side wall elevation；
Fig. 3 is the underground structure side wall sectional view of A-A in Fig. 2 of the embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Automatic hydraulic power balance stability against floating structure and method during a kind of Underground Construction are provided, referring to Fig. 1, packet
It includes：
S100：Plain concrete cushion layer and paving waterproof roll are set on the ground of default Foundation Pit bottom, pours and smashes underground structure
Reinforced concrete foundation and underground structure bottom plate；
S200：The cast-in-place side wall of first layer is set on the underground structure bottom plate；
S300：The cast-in-place side wall of the second layer is set in the outside, inside or two sides of the cast-in-place side wall of the first layer, and will be described
The cast-in-place side wall of first layer and the cast-in-place side wall overlapping of the second layer；
S400：After the cast-in-place side wall of the first layer and the cast-in-place side wall of the second layer overlap, in the cast-in-place side wall of the second layer
Upper paving water-tight device.
Further, the step of cast-in-place side wall of first layer is arranged on the underground structure bottom plate be specially：
Meet and is poured under the requirement of underground structure side wall serviceability limit state and ultimate limit states design thickness
Smash the cast-in-place side wall of underground structure reinforced concrete structure first layer；
The reserving hole on the cast-in-place side wall of the first layer；
The cast-in-place side wall of first layer pours smash maintenance after the completion of, the cast-in-place side wall of the first layer one or both sides be arranged
The interim filtration material such as geotextiles；
Further, the cast-in-place side wall of the second layer is arranged in the outside, inside or two sides in the cast-in-place side wall of the first layer,
And the step of overlapping the cast-in-place side wall of the first layer and the second layer cast-in-place side wall, is specially：
The anti-floating during the Superstructure Construction completion of underground structure or the backfill load right above it meet operation use
After stable requirement, the interim filtration material being arranged on the cast-in-place side wall of first layer is removed；
The concrete for pouring the one or both sides of the cast-in-place side wall of underground structure first layer afterwards forms second layer cast-in-place concrete side
Wall makes the first pouring concrete part of underground structure side wall pour part reinforced concrete wall with after and is superimposed together to form overlapping wall association
Same stress；
Further, described after the cast-in-place side wall of the first layer and the second layer cast-in-place side wall overlapping, in the second layer
Paving water-tight device is specially on cast-in-place side wall：
When after pour the concrete curing of part after the completion of, simultaneously to the side wall paving one or both sides waterproof roll of underground structure
Backfill foundation pit in time.
Further, a kind of automatic hydraulic power balance stability against floating method during Underground Construction further includes：On side wall
Reserving hole, the shape of hole can be round, square, rectangle or other shapes, size, quantity and the spacing of hole and answer
Meet sidewall structure intensity, deformation and the underground water not influenced when level of ground water sharply increases outside side wall to pour in underground structure
Portion is advisable, and away from substrate, a nearest round hole should meet when water level rises by formula (1) stability against floating requirement；
The formula (1) is specially：
In formula：GkIt is self-possessed for first cast-in-place underground structure, unit kN；Nw,kFor buoyancy value, unit kN；KwFor
Stability against floating safety coefficient can use 1.05 under normal circumstances.
Specifically, in the present embodiment, automatic hydraulic power balance anti-floating is steady during providing a kind of cut and cover method Underground Construction
Determine construction method, is described in detail by taking side wall as an example.
It includes following steps：
Step 1: plain concrete cushion layer and paving waterproof roll are arranged on the ground of default Foundation Pit bottom, pour and smash underground knot
Structure reinforced concrete foundation and underground structure bottom plate；
Step 2: meeting wanting for underground structure side wall serviceability limit state and ultimate limit states design thickness
It asks down to pour and smashes the cast-in-place side wall of underground structure reinforced concrete structure first layer.The cast-in-place side wall profile type of underground structure first layer can
Think "] ", " [", " ︱ ", " I " or other forms.The reserving hole on the cast-in-place side wall of first layer, the shape of hole can be circle
Shape, square, rectangle or other shapes, the arrangement form of hole can be rectangle or quincunx, the size of hole, quantity and
Spacing should meet sidewall structure intensity, deformation and the underground water not influenced when level of ground water sharply increases outside side wall and pour in underground
Inside configuration is advisable, and away from substrate, a nearest round hole should meet when water level rises by formula (1) stability against floating requirement.Reinforcing bar is mixed
The solidifying soil cast-in-place side wall of first layer pours smash maintenance after the completion of and in filtration materials such as side wall one or both sides setting geotextiles.
Step 3: use for reference superimposed sheet construction technology mature at present, when the Superstructure Construction of underground structure complete or its
During the backfill load satisfaction operation use of surface after the requirement of stability against floating, interim filtration material is removed, is poured for the second time
The concrete for smashing the one or both sides of underground structure side wall makes the first pouring concrete part of underground structure side wall pour part steel with after
Reinforced concrete wall is superimposed together to form overlapping wall cooperative bearing.Notice that first pouring concrete side wall answers exposed shear reinforcement, reinforcing bar
Truss or joint bar are to meet the front and back hole that cast-in-place concrete side wall cooperative bearing will be reserved on first pouring concrete side wall simultaneously twice
The pea gravel concreten of the high label in hole backfills vibration compacting.
Step 4: when after pour the concrete curing of part after the completion of, to the cast-in-place side wall paving one of the second layer of underground structure
Side or two sides waterproof roll simultaneously backfill foundation pit in time.
On the other hand, automatic hydraulic power balance stability against floating structure during a kind of Underground Construction is provided, referring to fig. 2-
3, including：Default foundation pit, the cast-in-place bottom plate 1 of underground structure, the cast-in-place side wall 2 of first layer, underground structure casting top slab 3, the second layer are existing
Pour side wall 6 and foundation pit side-wall 7；
The underground structure bottom plate is set to the bottom of underground structure, and the underground structure top board is set to the underground knot
The top of structure；The underground structure bottom plate is connect by the cast-in-place side wall of the first layer with the underground structure top board；Described
Reserving hole 4 is provided on one layer of cast-in-place side wall；The cast-in-place side wall of the second layer is set to the outer of the cast-in-place side wall of the first layer
Side, inside or two sides；
The foundation pit side-wall is set to around the cast-in-place side wall of the first layer and the cast-in-place side wall of the second layer, the foundation pit side
Wall is inclination or upright side wall.
Further, it presets and is provided with plain concrete cushion layer and paving waterproof roll on the ground of Foundation Pit bottom.
Further, the shape of the reserving hole can be round, square or rectangle, the arrangement of reserving hole
Form can be rectangle or quincunx.
Further, the junction of the cast-in-place side wall of the first layer and the cast-in-place side wall of the second layer is provided with shear reinforcement
Or steel bar girder 5.
Further, the cast-in-place side wall profile type of the first layer of the underground structure can for "] " type, " [" type, " ︱ " type
Or " I " type.
Specifically, in the present embodiment, with it is attached build formula underground structure "] " exterior wall cross-sectional diagram explanation：It is attached to build formula underground structure
Or the exterior wall section overlapping construction method of free-standing underground structure other shapes is also in the column of the protection of the application.
In the present embodiment, the shortcomings that in view of traditional float Structure, the present invention can satisfy underground structure in construction and maintenance and
Superstructure not yet construct it is complete it is attached build formula underground structure or its just on not yet backfill free-standing underground structure in construction period
Stability against floating requirement.When construction period occur underground water amplitude significantly rise so that underground water pour in foundation pit or heavy rain,
When surface water caused by the exceedingly odious weather such as mountain torrents pours in foundation pit on a large scale, the water outside the side wall of underground structure can pass through underground
The hole that (to be not limited only to the side wall of underground structure, be also possible to the bottom plate in underground structure) on structure side wall reserved is continually
The inside for leaking into underground structure.The waterpower inside and outside connection underground structure is linked up by way of reserving hole to reach equilibrium-like
State to meeting underground structure stability against floating requirement, at this point, entire underground structure like one sink under water it is riddled with gaping wounds
" broken ship " and the buoyancy for being not subjected to water.The superstructure that formula underground structure is built when attached complete or free-standing underground structure just on
When the backfill of side is completed and is able to satisfy the stability against floating during underground structure operation use, the water inside underground structure will be leaked into and taken out
It is dry, the filtration material being temporarily disposed on the cast-in-place side wall of first layer is removed, then pour the concrete of side wall one or both sides part afterwards,
So that front and back pours the armored concrete side wall smash twice and forms overlapping wall cooperative bearing.
Not yet go out when the exceedingly odious weather such as underground water substantial increase or heavy rain, mountain torrents does not occur for construction period generation
It is existing.It attached ought equally build after the completion of the backfill right above the superstructure completion or free-standing underground structure of formula underground structure, remove
Filtration material on underground structure side wall, after pour side wall one or both sides part concrete make front and back pour the reinforcing bar smash twice
Concrete side wall forms overlapping wall cooperative bearing.
The present invention construction period regardless of level of ground water either with or without rise or surface water either with or without foundation pit is poured in, can expire
The stability against floating requirement of sufficient structure.So as to avoid because of setting uplift pile, anti-float anchor rod or the preloading ballast on underground structure
And lead to economic loss or construction delay.
The foregoing is merely a prefered embodiment of the invention, is not intended to limit the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of automatic hydraulic power balance stability against floating method during Underground Construction, which is characterized in that including：
Plain concrete cushion layer and paving waterproof roll are set on the ground of default Foundation Pit bottom, pours and smashes underground structure armored concrete
Basis and underground structure bottom plate；
The cast-in-place side wall of first layer is set on the underground structure bottom plate；
The cast-in-place side wall of the second layer is set in the outside, inside or two sides of the cast-in-place side wall of the first layer, and the first layer is showed
Pour side wall and the cast-in-place side wall overlapping of the second layer；
After the cast-in-place side wall of the first layer and the cast-in-place side wall of the second layer overlap, the paving waterproof on the cast-in-place side wall of the second layer
Device.
2. the method as described in claim 1, which is characterized in that the cast-in-place side wall of first layer is arranged on the underground structure bottom plate
Step is specially：
Meet to pour under the requirement of underground structure side wall serviceability limit state and ultimate limit states design thickness and smashes ground
The cast-in-place side wall of flowering structure reinforced concrete structure first layer；
The reserving hole on the cast-in-place side wall of the first layer；
The cast-in-place side wall of first layer pours smash maintenance after the completion of, the cast-in-place side wall of the first layer one or both sides be arranged geotechnique
The interim filtration material such as cloth.
3. method according to claim 2, which is characterized in that it is described the outside of the cast-in-place side wall of the first layer, inside or
The cast-in-place side wall of the second layer is arranged in two sides, and the step of cast-in-place side wall of the first layer and the cast-in-place side wall of the second layer are overlapped is specific
For：
The stability against floating during the Superstructure Construction completion of underground structure or the backfill load right above it meet operation use
Requirement after, remove the interim filtration material that is arranged on the cast-in-place side wall of first layer；
The concrete for pouring the one or both sides of the cast-in-place side wall of underground structure first layer afterwards forms second layer cast-in-place concrete side wall, makes
The first pouring concrete part of underground structure side wall poured with after part reinforced concrete wall be superimposed together to be formed overlapping wall cooperate with by
Power.
4. method as claimed in claim 3, which is characterized in that described to work as the cast-in-place side wall of the first layer and the cast-in-place side of the second layer
After wall overlapping, paving water-tight device is specially on the cast-in-place side wall of the second layer：
When after pour the concrete curing of part after the completion of, side wall paving one or both sides waterproof roll to underground structure is simultaneously timely
Backfill foundation pit.
5. method according to claim 2, which is characterized in that further include：
The reserving hole on side wall, the shape of hole can be round, square, rectangle or other shapes, the size of hole,
Quantity and spacing should meet sidewall structure intensity, deformation and the underground water not influenced when level of ground water sharply increases outside side wall and gush
Entering is advisable inside underground structure, and away from substrate, a nearest round hole should meet when water level rises by formula (1) stability against floating requirement；
The formula (1) is specially：
In formula：GkIt is self-possessed for first cast-in-place underground structure, unit kN；Nw,kFor buoyancy value,
Unit is kN；KwFor stability against floating safety coefficient, it can use 1.05 under normal circumstances.
6. automatic hydraulic power balance stability against floating structure during a kind of Underground Construction, which is characterized in that including：Default foundation pit,
The cast-in-place side wall of underground structure bottom plate, first layer, underground structure top board, the cast-in-place side wall of the second layer and foundation pit side-wall；
The underground structure bottom plate is set to the bottom of the default foundation pit, and the underground structure top board is set to the underground knot
The top of structure；The underground structure bottom plate is connect by the cast-in-place side wall of the first layer with the underground structure top board；Described
Reserving hole is provided on one layer of cast-in-place side wall；The cast-in-place side wall of the second layer be set to the described first prefabricated side wall outside,
Inside or two sides are arranged simultaneously；
The foundation pit side-wall is set to around the cast-in-place side wall of the first layer and the cast-in-place side wall of the second layer, and the foundation pit side-wall is
Inclination or upright side wall.
7. automatic hydraulic power balance stability against floating structure during Underground Construction as claimed in claim 6, which is characterized in that institute
It states and is provided with plain concrete cushion layer and paving waterproof roll on the ground of default Foundation Pit bottom.
8. automatic hydraulic power balance stability against floating structure during Underground Construction as claimed in claim 6, which is characterized in that institute
The shape for stating reserving hole can be round, square or rectangle, arrangement form can be rectangle or quincunx.
9. automatic hydraulic power balance stability against floating structure during Underground Construction as claimed in claim 6, which is characterized in that institute
The junction for stating the cast-in-place side wall of first layer and the cast-in-place side wall of the second layer is provided with shear reinforcement or steel bar girder.
10. automatic hydraulic power balance stability against floating structure during Underground Construction as claimed in claim 6, which is characterized in that
The side wall profile type of the underground structure can for "] " type, " [" type, " ︱ " type or " I " type.
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| CN108842829B (en) | 2024-06-04 |
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