CN105002914B - Deformation-controllable prestressed concrete cantilever supporting structure and design and construction method thereof - Google Patents
Deformation-controllable prestressed concrete cantilever supporting structure and design and construction method thereof Download PDFInfo
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- CN105002914B CN105002914B CN201510471744.6A CN201510471744A CN105002914B CN 105002914 B CN105002914 B CN 105002914B CN 201510471744 A CN201510471744 A CN 201510471744A CN 105002914 B CN105002914 B CN 105002914B
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Abstract
The invention discloses a deformation-controllable prestressed concrete cantilever supporting structure and a design and construction method thereof, and relates to the field of geotechnical engineering. The structure comprises a common concrete cantilever supporting structure, prestressed tendons, fixing ends, and stretching ends. The stretching ends and the fixing ends are respectively on the upper ends and the lower ends of the prestressed tendons. The prestressed tendons and the fixing ends are arranged in the common concrete cantilever supporting structure. The stretching ends are anchored on the top end and/or the side wall of the common concrete cantilever supporting structure. The construction method is: arranging the prestressed tendons and anchorage devices of the prestressed tendon fixing ends in a reinforcement cage; lowering the reinforcement cage in a hole or a groove; concreting and constructing a top beam; and tensioning the prestressed tendons according to a pre-designed tensioning scheme, and anchoring the prestressed tendons on the stretching ends, so as to complete construction. The structure and the method solve problems that a common cantilever supporting structure is excessive in deformation, and configuring the prestressed tendons can obviously improve bearing capacity of the supporting structure, and a problem that a common cantilever supporting structure is excessive in size is solved.
Description
Technical field
A kind of the present invention relates to Geotechnical Engineering field, more particularly to the prestressed concrete cantilever retaining structure of controllable deforming
And its design and construction method.
Background technology
More than the foundation ditch of certain depth, its supporting construction adds anchor pole or inner support using support pile or diaphram wall
Pattern, with reduce campshed, the structural internal force of diaphram wall, reduce malformation.At present in actual base pit engineering, using pre-
The supporting construction of stress anchor pole or inner support is increasingly limited by following realistic problems：1) land resource and construction land are received
The restriction of red line, prestressed anchor certainly will exceed red line, cause and occupy the usufructuary problem of adjacent ground, cause to closing on underground
The adverse effect of space subsequent development, domestic some cities have also put into effect the government for not allowing supporting construction to go out property line successively
Administrative regulation.In addition, as periphery existing building has multi-storey basement, prestressed anchor cannot then be implemented.2) inner support supporting
Though system has a strong impact on normally applying for agent structure without the inner support for occupying setting in the usufructuary problem of adjacent ground, foundation ditch
Work, comprehensive cost are general also higher, are difficult to receive inner support supporting knot in many areas (such as Beijing), developer and contractor
Configuration formula.
Although cantilever supporting structure has the advantages that to avoid above-mentioned two classes problem, the top of cantilever supporting structure
, with the growth that the increase of foundation depth is in geometrical progression, excessive supporting construction displacement can cause soil structures to become for displacement and internal force
Shape is destroyed, and in turn results in surrounding building, surface subsidence and cracking, and this result can not be received；In excessive structure
Power certainly will require supporting construction section is significantly increased, so as to cause being significantly increased for cost.Thus, cantilever supporting structure can be fitted
Foundation depth is limited, it is impossible to solve the support issues of deep basal pit.
The content of the invention
It is an object of the invention to provide a kind of prestressed concrete cantilever retaining structure of controllable deforming and its design are applied
Work method, so that solve foregoing problems present in prior art.
To achieve these goals, the prestressed concrete cantilever retaining structure of controllable deforming of the present invention, described
Protection structure includes：Normal concrete cantilever retaining structure, presstressed reinforcing steel, fixing end, stretching end；
The normal concrete cantilever retaining structure includes：Concrete and the steel reinforcement cage being configured in the concrete；Institute
Stretching end, the fixing end is stated respectively positioned at the upper/lower terminal of the presstressed reinforcing steel；The presstressed reinforcing steel and anchoring it is described it is pre- should
The fixing end of power muscle is arranged in the normal concrete cantilever retaining structure, and with the normal concrete cantilever retaining structure
Synchronous construction；The stretching end is anchored in the Guan Liang on the normal concrete cantilever retaining structure top and/or is anchored at institute
State on the bracket of normal concrete cantilever retaining structure side wall；Beam number >=1 of the presstressed reinforcing steel, the shape of the presstressed reinforcing steel
It is linear and/or shaped form；Being applied to prestressing force on the presstressed reinforcing steel can equally can also be different.
Preferably, the normal concrete cantilever retaining structure is bored concrete pile or diaphram wall；The horizontal stroke of the bored concrete pile
The shape in section can be circular or rectangle, and the shape of the diaphram wall can be rectangle or T-shaped.
Preferably, the normal concrete cantilever retaining structure has one section of fixed section, the build-in below foundation ditch bottom surface
The length of section should also meet outside the requirement of earth pressure balance inside and outside foundation ditch after excavation of foundation pit meeting the cantilever supporting
Structure is limited in the degree of requirement in the displacement at excavation of foundation pit and corner.
Preferably, the presstressed reinforcing steel is post-stress muscle.
Preferably, the fixing end can adopt backing plate Contiuum type intermediate plate anchorage or Extrusion anchor ground tackle or ball Anchorage System to carry out anchor
Gu, the stretching end can be anchored using intermediate plate anchorage.
Preferably, can arrange in the concrete of the stretching end and the fixing end reinforced mesh and/or steel plate and/or
Steel hoop.
Preferably, after the completion of the construction of normal concrete cantilever retaining structure, then the construct Guan Liang and the bracket, institute
The construction for stating bracket can adopt reinforced concrete cast-in-situ, and structure steel fabrication may also be employed.
Preferably, position of the presstressed reinforcing steel in the normal concrete cantilever retaining structure pours described with decentralization
Space used by normal concrete cantilever retaining structure concrete shared by conduit is without common factor；
Space peripheral shared by the conduit decentralization can arrange additional bar cage or iron sheet, the additional bar cage or the ferrum
Skin is fixed in the steel reinforcement cage in advance.
Construction method of the present invention based on the prestressed concrete cantilever retaining structure of controllable deforming, methods described is according under
State step realization：
S1, according to the parameter screwing steel bars cage being pre-designed, and is fixedly installed presstressed reinforcing steel and prestressing force on steel reinforcement cage
The anchorage of muscle fixing end；
S2, steel reinforcement cage is transferred to and is constructed in the hole or groove for completing in advance；
S3, the casting concrete in hole or groove form bored concrete pile or diaphram wall, after concrete final set, construction stake
Top or wall apical cap beam；
S4, by concrete curing to the intensity being pre-designed after, presstressed reinforcing steel is carried out by the stretching plan being pre-designed
Tensioning is simultaneously anchored in stretching end, completes the construction of the prestressed concrete cantilever retaining structure of controllable deforming；
The stretching plan being pre-designed is divided into a step tensioning and substep tensioning, wherein；
The one step tensioning is concretely comprised the following steps：Judge that stretching end is at the top of supporting construction or supporting construction side
Portion：If stretching end is located at the top of supporting construction, directly tensioned prestressing bar is to the prestressing force being pre-designed；If stretching end
Positioned at supporting construction sidepiece, then earth excavation to stretching end, after bracket intensity meets design requirement, open by making bracket
The presstressed reinforcing steel is drawn to the prestressing force being pre-designed；
The substep tensioning is concretely comprised the following steps：First step tensioning is completed by the concrete steps of the step tensioning, is excavated
Cubic metre of earth to lower one presstressed reinforcing steel for needing tensioning lower section, make bracket, after bracket intensity meets design requirement, tensioning this
Road presstressed reinforcing steel then proceedes to earth excavation, one presstressed reinforcing steel under tensioning to the prestressing force being pre-designed, until tensioning is complete setting
Put till all presstressed reinforcing steels in the bored concrete pile or diaphram wall.
Method for designing of the present invention based on the prestressed concrete cantilever retaining structure of controllable deforming, the normal concrete
The design parameter of cantilever retaining structure and presstressed reinforcing steel is according to entering with the change of digging process soil pressure and the requirement of command displacement
Row design, the normal concrete cantilever retaining structure is bored concrete pile or diaphram wall, is specifically realized as steps described below：
B1, under a certain excavating condition of foundation ditch, using supporting construction as calculating object, inside and outside foundation ditch uneven soil pressure and
The prestressing force that tension of prestressed tendon is produced is put in supporting construction as load, applies soil spring simulation passive anti-on the inside of foundation ditch
Power, is calculated deformation and the internal force of supporting construction；
B2, judges whether calculated Supporting Structure deformation and internal force are satisfied by design requirement, if it is not, then adjustment institute
After stating the design parameter of bored concrete pile or diaphram wall and/or presstressed reinforcing steel, calculating process described in repeat step B1, until
The deformation of protection structure and internal force meet design requirement, subsequently into B3；If it is, being directly entered B3；
B3, circulate operation B1 to B2, check the deformation of supporting construction and internal force under each operating mode, until the change of supporting construction
Shape and internal force are satisfied by design requirement in whole digging process, complete the bored concrete pile or diaphram wall and presstressed reinforcing steel ginseng
Several designs；
Wherein, the design parameter of the presstressed reinforcing steel includes：Line style, area of section, prestressing force, position fixed ends and tensioning
End position.
The invention has the beneficial effects as follows：
The Deformation control of supporting construction of the present invention not against prestressed anchor or inner support, but by tying to supporting
Structure itself segmentation substep applies prestressing force, supporting construction is produced towards the deformation tendency outside foundation ditch in advance, after excavation of foundation pit
In permissible range, so as to solve, the deformation of normal concrete cantilever retaining structure is excessive to ask for the horizontal displacement of control supporting construction
Topic.On the other hand, under same cross-sectional size, can significantly improve supporting construction by curved shear resistance capacity, solve common mixed
Coagulate the oversized problem of soil cantilever retaining structure.
Description of the drawings
Fig. 1 is the prestressed concrete cantilever retaining structure side schematic view of controllable deforming；
Fig. 2 is the sectional view in Figure 1A-A directions；
Fig. 3 is the layout drawing of example pre-stressing force cantilever supporting construction pile body prestress wire；
Fig. 4 is the sectional view in Fig. 3 D-D directions；
Fig. 5 is the pile body the drift displacement curve of general cantilever stake and pre-stressing force cantilever stake of the present invention in the example；
The pile body the drift displacement curve of general cantilever stake is represented without the curve of mark, the curve with triangle mark represents that prestressing force hangs
The pile body the drift displacement curve of arm stake；
Wherein, 1 normal concrete cantilever retaining structure；2 presstressed reinforcing steels；3 fixing ends, 4 tensioning
End；5 Guan Liangs；6 brackets, B represent foundation ditch, and C-C ' represents fixed section.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing, the present invention is entered
Row is further described.It should be appreciated that specific embodiment described herein is not used to only to explain the present invention
Limit the present invention.
Embodiment
With reference to Fig. 1, the prestressed concrete cantilever retaining structure of controllable deforming described in the present embodiment includes：Common coagulation
Native cantilever retaining structure, presstressed reinforcing steel, fixing end, stretching end；The normal concrete cantilever retaining structure includes：Concrete and
The steel reinforcement cage being configured in the concrete；The stretching end, the fixing end are respectively positioned at upper and lower the two of the presstressed reinforcing steel
End；The fixing end of the presstressed reinforcing steel and the anchoring presstressed reinforcing steel is arranged in the normal concrete cantilever retaining structure,
And with the normal concrete cantilever retaining structure synchronous construction；The stretching end is anchored at the normal concrete cantilever supporting
In the Guan Liang of structure top end and/or it is anchored on the bracket of the normal concrete cantilever retaining structure side wall.The prestressing force
Beam number >=1 of muscle, the shape of the presstressed reinforcing steel is linear and/or shaped form；Be applied on the presstressed reinforcing steel it is pre- should
Power can equally can also be different.The presstressed reinforcing steel is post-stress muscle.More detailed description is：
(1) after the completion of the construction of normal concrete cantilever retaining structure, then the construct Guan Liang and the bracket, it is described
The construction of bracket adopts reinforced concrete cast-in-situ or adopts structure steel fabrication.Generally, normal concrete cantilever supporting knot
Can all there be Guan Liang on structure top, and not necessarily have bracket, only when need to normal concrete cantilever retaining structure side wall anchoring steel twist
During line, bracket can be just set.
(2) the normal concrete cantilever retaining structure is bored concrete pile or diaphram wall；The cross section of the bored concrete pile
Shape can be circular or rectangle, the shape of the diaphram wall can be rectangle or T-shaped.
The normal concrete cantilever retaining structure has one section of fixed section, the length of the fixed section below foundation ditch bottom surface
Should also meet the cantilever retaining structure after excavation of foundation pit in base outside the requirement of earth pressure balance inside and outside foundation ditch meeting
Displacement and corner at the excavation of hole is limited in the degree of requirement.
(3) fixing end can adopt backing plate Contiuum type intermediate plate anchorage or Extrusion anchor ground tackle or ball Anchorage System to be anchored, institute
State stretching end to be anchored using intermediate plate anchorage.
Reinforced mesh and/or steel plate and/or steel hoop can be set in the concrete of the stretching end and the fixing end,
As the destruction of agent on crack resistance of concrete local compression, anti-splitting, anti-breakaway measure.
(4) position of the presstressed reinforcing steel in the normal concrete cantilever retaining structure pours described general with decentralization
Space used by logical concrete cantilever retaining structure concrete shared by conduit is without common factor；Space peripheral shared by the conduit decentralization
Additional bar cage or iron sheet can be set, and the additional bar cage or the iron sheet are fixed in the steel reinforcement cage in advance.Purpose is
Prevent concreting conduit damaged in collision in decentralization process be set in advance in the steel reinforcement cage it is described pre- should
Power muscle.
(5) stretching end is anchored at the normal concrete cantilever retaining structure top and/or side wall, more specifically
For：When the stretching end is arranged on the cantilever retaining structure top, then it is anchored in Guan Liang, when the stretching end is arranged on
During the cantilever retaining structure sidepiece, then it is anchored on bracket.
Based on the construction method of the prestressed concrete cantilever retaining structure of controllable deforming described in the present embodiment, methods described
Realize as steps described below：
S1, according to the parameter screwing steel bars cage being pre-designed, and is fixedly installed presstressed reinforcing steel and prestressing force on steel reinforcement cage
The anchorage of muscle fixing end；
S2, steel reinforcement cage is transferred to and is constructed in the hole or groove for completing in advance；
S3, the casting concrete in hole or groove form bored concrete pile or diaphram wall, after concrete final set, construction stake
Top or wall apical cap beam；
S4, by concrete curing to the intensity being pre-designed after, presstressed reinforcing steel is carried out by the stretching plan being pre-designed
Tensioning is simultaneously anchored in stretching end, completes the construction of the prestressed concrete cantilever retaining structure of controllable deforming；
The stretching plan being pre-designed is divided into a step tensioning and substep tensioning, wherein；
The one step tensioning is concretely comprised the following steps：Judge that stretching end is at the top of supporting construction or supporting construction side
Portion：If stretching end is located at the top of supporting construction, directly tensioned prestressing bar is to the prestressing force being pre-designed；If stretching end
Positioned at supporting construction sidepiece, then earth excavation to stretching end, after bracket intensity meets design requirement, open by making bracket
The presstressed reinforcing steel is drawn to the prestressing force being pre-designed；
The substep tensioning is concretely comprised the following steps：First step tensioning is completed by the concrete steps of the step tensioning, is excavated
Cubic metre of earth to lower one presstressed reinforcing steel for needing tensioning lower section, make bracket, after bracket intensity meets design requirement, tensioning this
Road presstressed reinforcing steel then proceedes to earth excavation, one presstressed reinforcing steel under tensioning to the prestressing force being pre-designed, until tensioning is complete setting
Put till all presstressed reinforcing steels in the bored concrete pile or diaphram wall.
Based on the method for designing of the prestressed concrete cantilever retaining structure of controllable deforming described in the present embodiment, the perfusion
The design parameter of stake or diaphram wall and presstressed reinforcing steel is according to the change with digging process soil pressure and the requirement of command displacement
It is designed, specifically realizes as steps described below：
B1, under a certain excavating condition of foundation ditch, using supporting construction as calculating object, inside and outside foundation ditch uneven soil pressure and
The prestressing force that tension of prestressed tendon is produced is put in supporting construction as load, applies soil spring simulation passive anti-on the inside of foundation ditch
Power, is calculated deformation and the internal force of supporting construction；
B2, judges whether calculated Supporting Structure deformation and internal force are satisfied by design requirement, if it is not, then adjustment institute
After stating the design parameter of bored concrete pile or diaphram wall and/or presstressed reinforcing steel, calculating process described in repeat step B1, until
The deformation of protection structure and internal force meet design requirement, subsequently into B3；If it is, being directly entered B3；
B3, circulate operation B1 to B2, check the deformation of supporting construction and internal force under each operating mode, until the change of supporting construction
Shape and internal force are satisfied by design requirement in whole digging process, complete the bored concrete pile or diaphram wall and presstressed reinforcing steel ginseng
Several designs；
Wherein, the design parameter of the presstressed reinforcing steel includes：Line style, area of section, prestressing force, position fixed ends and tensioning
End position.
The effect of the present invention is can significantly to reduce the deformation of general cantilever formula supporting construction so that deformation control of foundation pit is being permitted
Perhaps in the range of.The effect of the present invention is illustrated by an example.
Example：Soil body design parameter is, unit weight 20kN/m3, cohesive strength 20kPa, 30 ° of internal friction angle, excavation of foundation pit depth
For 14m, adopt diameter of section for 1000mm circular concrete cantilever supporting pile, pile spacing 1.5m, building-in depth 10m, pile body
Strength grade of concrete is C40.Using Inst. of Foundation, Chinese Inst. of Architectural Sciences's Foundation Pit Support Design business software
RSD3.0 is calculated, and common cantilever retaining structure displacement at pile top is 181mm.Arrangement prestress steel strand wires such as Fig. 3, figure in the pile body
Shown in 4,4 steel strand wires are configured per beam steel strand wires, the control stress for prestressing of presstressed reinforcing steel is 1395kPa.After applying prestressing force, stake
Top displacement is 24mm, and it is 86.7% to reduce amplitude, and pile body maximum displacement is also only 36mm, meets requirement of engineering.Normal concrete
The pile body the drift displacement curve of cantilever pile and prestressed concrete cantilever pile of the present invention is as shown in Figure 5.
By using above-mentioned technical proposal disclosed by the invention, having obtained following beneficial effect：
The Deformation control of supporting construction of the present invention not against prestressed anchor or inner support, but by tying to supporting
Structure itself segmentation substep applies prestressing force, supporting construction is produced towards the deformation tendency outside foundation ditch in advance, controls supporting construction
Horizontal displacement in permissible range, it is excessive so as to solve the problems, such as the deformation of normal concrete cantilever retaining structure.On the other hand, exist
Under same cross-sectional size, supporting construction can be significantly improved by curved shear resistance capacity, normal concrete cantilever retaining structure is solved
Oversized problem.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
Depending on protection scope of the present invention.
Claims (9)
1. the construction method of the prestressed concrete cantilever retaining structure of a kind of controllable deforming, it is characterised in that
The prestressed concrete cantilever retaining structure of the controllable deforming includes：Normal concrete cantilever retaining structure, prestressing force
Muscle, fixing end, stretching end；
The normal concrete cantilever retaining structure includes：Concrete and the steel reinforcement cage being configured in the concrete；Described
Pull end, the fixing end are respectively positioned at the upper/lower terminal of the presstressed reinforcing steel；The presstressed reinforcing steel and the anchoring presstressed reinforcing steel
Fixing end be arranged in the normal concrete cantilever retaining structure, and with the normal concrete cantilever retaining structure synchronization
Construction；The stretching end is anchored in the Guan Liang on the normal concrete cantilever retaining structure top and/or is anchored at described general
On the bracket of logical concrete cantilever retaining structure side wall；Beam number >=1 of the presstressed reinforcing steel, the shape of the presstressed reinforcing steel is straight
Linear and/or shaped form；The prestressing force being applied on the presstressed reinforcing steel is identical or different；
Methods described is realized as steps described below：
S1, according to the parameter screwing steel bars cage that is pre-designed, and is fixedly installed presstressed reinforcing steel and presstressed reinforcing steel is solid on steel reinforcement cage
The anchorage of fixed end；
S2, steel reinforcement cage is transferred to and is constructed in the hole or groove for completing in advance；
S3, the casting concrete in hole or groove form bored concrete pile or diaphram wall, after concrete final set, construction stake top or
Wall apical cap beam；
S4, by concrete curing to the intensity being pre-designed after, tensioning is carried out to presstressed reinforcing steel by the stretching plan being pre-designed
And stretching end is anchored in, complete the construction of the prestressed concrete cantilever retaining structure of controllable deforming；
The stretching plan being pre-designed is divided into a step tensioning and substep tensioning, wherein；
The one step tensioning is concretely comprised the following steps：Judge that stretching end is at the top of supporting construction or supporting construction sidepiece：Such as
Fruit stretching end is located at the top of supporting construction, then direct tensioned prestressing bar is to the prestressing force being pre-designed；If stretching end is located at
Supporting construction sidepiece, then earth excavation to stretching end, make bracket, after bracket intensity meets design requirement, tensioning institute
Presstressed reinforcing steel is stated to the prestressing force being pre-designed；
The substep tensioning is concretely comprised the following steps：First step tensioning, earth excavation are completed by the concrete steps of the step tensioning
To the lower section of lower one presstressed reinforcing steel for needing tensioning, bracket is made, after bracket intensity meets design requirement, this road of tensioning is pre-
Stress rib then proceedes to earth excavation, one presstressed reinforcing steel under tensioning to the prestressing force being pre-designed, until tensioning is complete being arranged on
Till all presstressed reinforcing steels in the bored concrete pile or diaphram wall.
2. the method for designing of the prestressed concrete cantilever retaining structure of a kind of controllable deforming, it is characterised in that
The prestressed concrete cantilever retaining structure of the controllable deforming includes：Normal concrete cantilever retaining structure, prestressing force
Muscle, fixing end, stretching end；
The normal concrete cantilever retaining structure includes：Concrete and the steel reinforcement cage being configured in the concrete；Described
Pull end, the fixing end are respectively positioned at the upper/lower terminal of the presstressed reinforcing steel；The presstressed reinforcing steel and the anchoring presstressed reinforcing steel
Fixing end be arranged in the normal concrete cantilever retaining structure, and with the normal concrete cantilever retaining structure synchronization
Construction；The stretching end is anchored in the Guan Liang on the normal concrete cantilever retaining structure top and/or is anchored at described general
On the bracket of logical concrete cantilever retaining structure side wall；Beam number >=1 of the presstressed reinforcing steel, the shape of the presstressed reinforcing steel is straight
Linear and/or shaped form；The prestressing force being applied on the presstressed reinforcing steel is identical or different；
The design parameter of the normal concrete cantilever retaining structure and presstressed reinforcing steel is according to the change with digging process soil pressure
Requirement with command displacement is designed, and the normal concrete cantilever retaining structure is bored concrete pile or diaphram wall, specifically
Realize as steps described below：
B1, under a certain excavating condition of foundation ditch, using supporting construction as object is calculated, inside and outside foundation ditch, uneven soil pressure is answered with pre-
The prestressing force that the tensioning of power muscle is produced is put in supporting construction as load, applies soil spring simulation passive resisting force on the inside of foundation ditch,
It is calculated deformation and the internal force of supporting construction；
B2, judges whether calculated Supporting Structure deformation and internal force are satisfied by design requirement, if it is not, then the adjustment filling
After the design parameter of note stake or diaphram wall and/or presstressed reinforcing steel, calculating process described in repeat step B1, until supporting is tied
The deformation of structure and internal force meet design requirement, subsequently into B3；If it is, being directly entered B3；
B3, circulate operation B1 to B2, check the deformation of supporting construction and internal force under each operating mode, until supporting construction deformation and
Internal force is satisfied by design requirement in whole digging process, completes the bored concrete pile or diaphram wall and presstressed reinforcing steel parameter
Design；
Wherein, the design parameter of the presstressed reinforcing steel includes：Line style, area of section, prestressing force, position fixed ends and stretching end position
Put.
3. method for designing according to claim 2, it is characterised in that the normal concrete cantilever retaining structure is bored concrete pile
Or diaphram wall；The shape of the cross section of the bored concrete pile is circular or rectangle, and the shape of the diaphram wall is rectangular
Shape or T-shaped.
4. method for designing according to claim 2, it is characterised in that the normal concrete cantilever retaining structure is at foundation ditch bottom
There is one section of fixed section below face, the length of the fixed section should also meet outside the requirement of earth pressure balance inside and outside foundation ditch meeting
The cantilever retaining structure is limited in the degree of requirement in the displacement at excavation of foundation pit and corner after excavation of foundation pit.
5. method for designing according to claim 2, it is characterised in that the presstressed reinforcing steel is post-stress muscle.
6. method for designing according to claim 2, it is characterised in that the fixing end adopt backing plate Contiuum type intermediate plate anchorage or
Extrusion anchor ground tackle or ball Anchorage System are anchored, and the stretching end is anchored using intermediate plate anchorage.
7. method for designing according to claim 2, it is characterised in that in the concrete of the stretching end and the fixing end
Reinforced mesh and/or steel plate and/or steel hoop are set.
8. method for designing according to claim 2, it is characterised in that complete in the construction of normal concrete cantilever retaining structure
Afterwards, then the construct Guan Liang and the bracket, the construction of the bracket adopts reinforced concrete cast-in-situ or adopts structure steel fabrication.
9. method for designing according to claim 2, it is characterised in that the presstressed reinforcing steel is in the normal concrete cantilever
Position in protection structure pours the space used by the normal concrete cantilever retaining structure concrete shared by conduit with decentralization
Without common factor；
Space peripheral shared by the conduit decentralization arranges additional bar cage or iron sheet, and the additional bar cage or the iron sheet are advance
It is fixed in the steel reinforcement cage.
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| CN105926639A (en) * | 2016-06-28 | 2016-09-07 | 南华大学 | Supporting system and monitoring method of foundation pit near city expressway |
| CN106057062A (en) * | 2016-06-29 | 2016-10-26 | 江苏建筑职业技术学院 | Pre-stressed structure danger source identification experience area and construction method thereof |
| KR102405301B1 (en) * | 2020-04-21 | 2022-06-07 | 주식회사 택한 | Self-reliant support for retaining wall |
| CN112982432A (en) * | 2021-02-10 | 2021-06-18 | 建研地基基础工程有限责任公司 | Prestressed concrete foundation pit supporting structure and construction method |
| KR102361565B1 (en) * | 2021-09-07 | 2022-02-14 | 주식회사 택한 | Self-reliant support for retaining wall |
| CN116220006A (en) * | 2023-03-07 | 2023-06-06 | 广州市市政工程试验检测有限公司 | Post Zhang Huan bonded prestressed combined rammed pile and construction method thereof |
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| JP5037387B2 (en) * | 2008-02-29 | 2012-09-26 | 株式会社ピーエス三菱 | Construction method of retaining wall |
| CN102345291A (en) * | 2011-07-21 | 2012-02-08 | 从卫民 | Partially prestressed supporting cantilever pile |
| CN103306282B (en) * | 2013-06-13 | 2015-10-14 | 中铁隧道集团有限公司 | The prestressed concrete pile of subsection reinforcement and construction method |
| CN103774675B (en) * | 2014-01-24 | 2015-06-24 | 中国建筑股份有限公司 | Combined double-row-pile combined vertical prestress anchor rod supporting system and construction method thereof |
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