CN110284497A - A kind of control soft soil foundation pit underlies the foundation reinforcement method of existing tunnel malformation - Google Patents
A kind of control soft soil foundation pit underlies the foundation reinforcement method of existing tunnel malformation Download PDFInfo
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- CN110284497A CN110284497A CN201910553513.8A CN201910553513A CN110284497A CN 110284497 A CN110284497 A CN 110284497A CN 201910553513 A CN201910553513 A CN 201910553513A CN 110284497 A CN110284497 A CN 110284497A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- General Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Underlie the foundation reinforcement method of existing tunnel malformation the invention discloses a kind of control soft soil foundation pit, by in existing tunnel structure two sides, intermediate position and top use varying depth, ash quantity is mixed in change and variable-diameter cement-soil stirring piles carry out foundation stabilization, and single-layer or multi-layer plate soil cement reinforcing layer is formed by expanding reinforcing body diameter at position below newly-built underground structure bottom plate, pass through uplift pile simultaneously, newly-built underground structure bottom plate effectively couples the whole door case type safeguard structure of formation with plate soil cement reinforcing layer three's, protect the existing tunnel structure therein that underlies, influence of the top Underground Construction disturbance to the existing tunnel structure that underlies can be greatly reduced, ensure its safe operation.
Description
Technical field
The invention belongs to civil construction technical field of transportation, and in particular to a kind of control soft soil foundation pit underlies existing tunnel knot
The foundation reinforcement method of structure deformation.
Background technique
With the large-scale development of urban underground space, when different depth level, different spatial relationship, difference are developed
Phase the old and new's underground engineering structure of construction influences each other generation, wherein (such as town road tunnel, underground are comprehensive for newly-built underground engineering
Close piping lane etc.) influence of the open cut deep basal pit to the existing tunnel structure that underlies be a kind of typical operating condition.Existing processing method packet
Including to be formed using bored concrete pile or sheet pile in existing tunnel structure two sides and top protects wall (frame) to protect existing underground structure,
Carry out full hall stiffening basic ground above existing tunnel simultaneously, the former cost is huge, and the construction off-load disturbance of the latter is to underliing
The engineering structures such as subterranean tunnel are affected, cases show that the foundation stabilization staged construction carried out above existing tunnel is disturbed
Subway tunnel deflection caused by dynamic reaches 50% or more of total protuberance deflection, even more than grand caused by the later period excavation stage
Deflection is played, therefore is badly in need of proposing that a kind of control soft soil foundation pit underlies the foundation stabilization side of existing underground engineering structure protuberance deformation
The foundation treatment mode that method replaces existing full hall to reinforce, to reduce the construction disturbance in foundation stabilization stage, and it is subsequent to reach control
Excavate the effect that the underground structure deformation that causes to underlie is swelled in ground off-load.
Summary of the invention
To solve the above problems, underliing the ground of existing tunnel malformation the invention discloses a kind of control soft soil foundation pit
Reinforcement means, influence of the foundation stabilization construction to the existing tunnel that underlies when can greatly reduce the construction of top underground structure, it is ensured that
Underlie the operation security of existing tunnel.
In order to achieve the above objectives, technical scheme is as follows:
A kind of control soft soil foundation pit underlies the foundation reinforcement method of existing tunnel malformation, includes the following steps:
(1) it is required according to existing tunnel malformation control of underliing, calculates and determine ground reinforcing scope and Design of Reinforcement parameter；
(2) the cement mixing method strengthening construction on the outside of existing tunnel structure both sides that underlies is completed first；Secondly, completing in two tunnels
Between position cement mixing method strengthening construction；Existing tunnel superstructure position cement mixing method reinforcing of underliing finally is carried out again
Construction；
(3) construction of newly-built underground structure uplift pile is completed, and stake side is carried out with lower portion in newly-built underground structure bottom plate
Grouting behind shaft or drift lining；
(4) foundation pit enclosure structure construction is completed, is excavated to projected depth, casting concrete bottom plate, and couple with uplift pile；
(5) newly-built underground structure side wall, top board construction are completed；Backfill, and restore road surface, complete construction.
Preferably, it in step (1), is analyzed using finite element numerical computational methods and creates underground under different ground Scheme of Strengthening
Influence of the structure construction to the tunnel structure that underlies determines therefrom that foundation stabilization design parameter, including reinforcing scope, different parts add
Gu depth, cement mixing method stake spacing, cement earth pile variable diameter parameter (variable diameter position, reinforcing body enlarged diameter and height).
Preferably, in step (2), on the outside of the existing tunnel structure that underlies both sides and intermediate position cement mixing method should be reinforced
5m depth is no less than below to the existing tunnel structural base that underlies；The existing tunnel superstructure position cement mixing method that underlies adds
Gu deep-controlled in 1m depth many at the top of tunnel structure.
Preferably, in step (2), control different depth cement mixing method mixes grey (cement) amount, from earth's surface to newly-builtly
Flowering structure ceiling location is that low-mix ash quantity reinforces section, mixes ash quantity to control and be advisable 5%；It is between newly-built underground structure roof and floor
Medium ash quantity of mixing reinforces section, and mix ash content control is advisable in 10%-15%；The following are highly doped ash quantity to reinforce for newly-built underground structure bottom plate
Section, mix ash content control is advisable in 25-40%.
Preferably, in step (2), creating the following cement mixing method reinforcing body raised-diameter segment of underground structure bottom plate should be by
Certain size overlaps (250mm), to form certain thickness plate reinforcing layer.
Preferably, in step (3), after resistance to plucking pile driving construction, by behind the stake side for passing through soil cement plate reinforcing layer position
Slip casting effectively couples with plate reinforcing layer and newly-built underground structure concrete floor, to form the reinforcing knot of whole door case type
Structure, and then play a protective role to the existing tunnel structure therein that underlies is located at.
A kind of control soft soil foundation pit underlies the foundation reinforcement method of existing tunnel malformation, and foundation reinforcing structure includes
Newly-built underground structure；Underlie existing tunnel structure；Prime stratum；The uplift pile of newly-built underground structure；Cement mixing method；
Mixing pile low-mix ash quantity segment；Mixing pile is medium to mix ash quantity segment；The highly doped ash quantity of mixing pile and variable diameter segment；The a variety of changes of reducer
Diameter mode；Existing underground tunnel structure two sides stabilization zone；Stabilization zone among existing underground tunnel structure；Existing underground tunnel structure
Top stabilization zone；Reducer overlaps the plate reinforcing layer to be formed.
Preferably, create underground structure and be located at and underlie existing tunnel superstructure, in the two plane can it is orthogonal thereto or
Oblique, newly-built underground structure can for urban municipal road tunnel, subway tunnel, pipe gallery, humanoid underpass or its
Its underground structure, existing tunnel structure can be the works such as town road tunnel, subway tunnel or pipe gallery.
Preferably, the following are highly doped ash quantity and variable diameter segment three can use different variable diameter moulds for newly-built underground structure bottom plate
Formula forms the direct expanding reach of reinforcing body, including top variable diameter, middle part variable diameter, lower part variable diameter or upper middle lower part variable diameter in different location
Combination.
Preferably, reducer segment three can apply pillar raised-diameter segment using different construction machineries or sawtooth pattern is straight
Diameter expanding reach or other possible stake diameters expand mode (including screw-type, screw, spherical etc.).
Preferably, uplift pile and newly-built underground structure bottom plate, plate reinforcing layer are coupled to each other that form whole door case type anti-
Protection structure.
Beneficial effects of the present invention:
The present invention is by mixing ash quantity and variable diameter cement using varying depth, change in existing tunnel structure two sides, intermediate position and top
Native mixing pile carries out foundation stabilization, and forms single layer by expanding reinforcing body diameter at position below newly-built underground structure bottom plate
Or multilayer plate soil cement reinforcing layer, while being reinforced by uplift pile, newly-built underground structure concrete bottom plate and plate book soil
Effective connection of layer three forms whole door case type safeguard structure, protects existing tunnel structure therein, can greatly reduce
Influence of the square Underground Construction to the existing tunnel structure that underlies, it is ensured that its safe operation.
Detailed description of the invention
Fig. 1 is positional structure schematic diagram of the invention.
Fig. 2 is cement mixing method different structure schematic diagram of the invention.
Fig. 3 is different parts cement mixing method reinforcing scope schematic diagram of the invention.
Fig. 4 is that cement mixing pile variable diameter of the invention overlaps the plate reinforcing layer schematic diagram to be formed.
Fig. 5 is diameter changeable agitation plane bridging method schematic diagram.
Wherein, 1, newly-built underground structure；2, underlie existing tunnel structure；3, prime stratum；4, uplift pile；5, soil cement
Mixing pile；6, mixing pile low-mix ash quantity segment one；7, mixing pile is medium mixes ash quantity segment two；8, the highly doped ash quantity of mixing pile and variable diameter
Segment three；9, a variety of variable diameter modes of reducer；10, existing underground tunnel structure two sides stabilization zone；11, existing underground tunnel structure
Intermediate stabilization zone；12, stabilization zone above existing underground tunnel structure；13, plate reinforcing layer.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated, it should be understood that following specific embodiments are only
For illustrating the present invention rather than limiting the scope of the invention.It should be noted that word " preceding " used in the following description,
" rear ", "left", "right", "up" and "down" refer to that the direction in attached drawing, word "inner" and "outside" refer respectively to direction or remote
Direction from geometric center of specific component.
The foundation reinforcement method of existing tunnel malformation as shown in Figure 1, a kind of control soft soil foundation pit underlies, structure packet
It includes: newly-built underground structure 1；Underlie existing tunnel structure 2；Prime stratum 3；The uplift pile 4 of newly-built underground structure；Cement
Native mixing pile 5；Mixing pile low-mix ash quantity segment 6；Mixing pile is medium to mix ash quantity segment 7；The highly doped ash quantity of mixing pile and variable diameter segment
8；The a variety of variable diameter modes 9 of reducer；Existing underground tunnel structure two sides stabilization zone 10；Stabilization zone among existing underground tunnel structure
11；Stabilization zone 12 above existing underground tunnel structure；Reducer overlaps the plate reinforcing layer 13 to be formed.
A kind of control soft soil foundation pit underlies the foundation reinforcement method of existing tunnel malformation, specifically comprise the following steps:
(1) according to the requirement of the Deformation control for the existing tunnel structure 2 that underlies, carry out Finite Element Numerical Simulation analysis, to different grounds
Top creates the deformation of existing tunnel structure 2 of underliing caused by underground structure 1 is constructed and carries out analysis comparison under the conditions of Scheme of Strengthening,
Ground reinforcement design scheme is selected accordingly, specifies ground reinforcing scope and Design of Reinforcement parameter；
(2) it according to ground reinforcement design scheme, carries out subregion strengthening construction: carrying out underlie outside 2 both sides of existing tunnel structure first
10 cement mixing method strengthening construction of side；It is stirred secondly, carrying out two intermediate 11 soil cements of position of existing tunnel structure 2 that underlie
Mix a strengthening construction；Finally, carrying out 2 top position of existing tunnel structure, the 12 cement mixing method strengthening construction that underlies.Newly-built ground
When the following cement-soil stirring pile construction of 1 bottom plate of flowering structure object, overlap mixing pile to form single-layer or multi-layer different depth is expanding
Plate reinforcing layer 13；
(3) it constructs and creates the uplift pile 4 of underground structure, and after newly-built 1 bottom plate of underground structure carries out stake side with lower portion
Uplift pile 4 is coupled the first road entirety door case type safeguard structure of formation by slip casting with single-layer or multi-layer plate reinforcing layer 13；
(4) carry out open-cut foundation ditch building enclosure construction, excavation pit to projected depth, pour underground structure bottom plate and by its with
The connection of uplift pile 4 forms secondary protection structure；
(5) continue construct newly-built 1 side wall of underground structure and top plate；The soil body is backfilled, and restores road surface, completes construction.
In step (1), Finite Element Numerical Simulation analysis is carried out to different ground Scheme of Strengthening, under the conditions of obtaining different reinforcings
Underlie tunnel structure deformation numerical value caused by newly-built Underground Construction, and then is required according to deformation controlling standards, selectes ground
Scheme of Strengthening and its Design of Reinforcement parameter, including foundation stabilization planar range, different parts reinforcement depth, cement mixing method stake
Spacing, cement earth pile variable diameter parameter (reinforcing body enlarged-diameter position and enlarged diameter expand height).
In step (2), 2 two sides of the existing tunnel structure that underlies and intermediate portion position cement mixing method depth should reach and underlie both
There is 2 bottom plate of tunnel structure or less 5m or more；2 top cement mixing method depth of the existing tunnel structure that underlies should distance underlie existing tunnel
It is not less than 1m above 2 top plate of road structure.
In step (2), cement mixing method 5 is mixed ash quantity and is changed from top to bottom, and creating 1 top plate of underground structure, the above are low
Ash quantity segment 1 is mixed, mixes ash quantity no more than 5%；Be between newly-built underground structure roof and floor it is medium mix ash quantity segment 27, mix ash quantity
Control is advisable in 10%-15%；The following are highly doped ash quantity segments 38 to mix ash quantity according to characteristics of soft clay and answer for newly-built underground structure bottom plate
Control is advisable in 25-40%.
In step (2), the following direct expanding reach of cement mixing method reinforcing body of 1 bottom plate of underground structure is created with a scale
Very little overlap joint (general 250mm) forms plate horizontal reinforcing layer 13.
In step (3), uplift pile 4 and plate horizontal reinforcing layer 13, newly-built 1 bottom plate connecting of underground structure form integral door
The ruggedized construction of frame.
The present invention mixes ash quantity using varying depth, change by the position among existing tunnel structure two sides, two tunnels and top
And variable-diameter cement-soil stirring piles carry out foundation stabilization, and pass through expansion reinforcing body at position below newly-built underground structure bottom plate
Diameter forms single-layer or multi-layer plate soil cement reinforcing layer, while passing through uplift pile, newly-built underground structure concrete bottom plate and plate
Effective connection of shape soil cement reinforcing layer three forms whole door case type safeguard structure, protects the existing tunnel knot therein that underlies
Structure can greatly reduce influence of the top Underground Construction to the existing tunnel structure that underlies, it is ensured that its safe operation.
The technical means disclosed in the embodiments of the present invention is not limited only to technological means disclosed in above embodiment, further includes
Technical solution consisting of any combination of the above technical features.
Claims (10)
- The foundation reinforcement method of existing tunnel malformation 1. a kind of control soft soil foundation pit underlies, which is characterized in that including as follows Step:(1) according to the deformation controlling standards of existing tunnel structure, the method analyzed using Finite Element Numerical Simulation, to different ground Base Scheme of Strengthening is compared, and specifies ground reinforcing scope and Design of Reinforcement parameter；(2) existing tunnel structure two sides, centre and the construction of top different parts Reinforcement with Cement-mixed Piles are completed；(3) resistance to plucking pile driving construction is completed, and carries out a side grouting behind shaft or drift lining；(4) foundation pit enclosure structure construction is completed, is excavated to projected depth, casting concrete bottom plate, and couple with uplift pile；(5) newly-built underground structure side wall, top board construction are completed；Backfill, and restore road surface, complete construction.
- The foundation stabilization side of existing underground tunnel structure protuberance deformation 2. control soft soil foundation pit as described in claim 1 underlies Method,It is characterized in that, foundation stabilization design parameter specifically includes plane reinforcing scope, different parts are reinforced deeply in step (1) Degree, cement mixing method stake spacing, cement earth pile variable diameter parameter, reinforcing body enlarged-diameter position and enlarged diameter expand height.
- The foundation stabilization side of existing underground tunnel structure protuberance deformation 3. control soft soil foundation pit as described in claim 1 underlies Method,It is characterized in that, existing tunnel two sides position cement mixing method strengthening construction is completed first, secondly, complete in step (2) At intermediate position cement mixing method strengthening construction；Finally, completing position cement mixing method strengthening construction above existing tunnel； The construction of cement mixing method variable diameter is completed by design requirement in newly-built underground structure bottom plate following depth, and passes through expanding reach Overlap joint forms complete plate reinforcing layer.
- The foundation reinforcement method of existing tunnel malformation 4. a kind of control soft soil foundation pit underlies, which is characterized in that its ground adds Fixing structure includes:Newly-built underground structure (1)；The existing tunnel structure that underlies (2)；Prime stratum (3)；The uplift pile of newly-built underground structure (4)；Cement mixing method (5)；Mixing pile low-mix ash quantity segment (6)；Mixing pile is medium to mix ash quantity segment (7)；Mixing pile is highly doped Ash quantity and variable diameter segment (8)；The a variety of variable diameter modes (9) of reducer；Existing underground tunnel structure two sides stabilization zone (10)；Existingly Among lower tunnel structure stabilization zone (11)；Above existing underground tunnel structure stabilization zone (12)；Reducer overlaps the plate to be formed Reinforcing layer (13).
- The foundation reinforcement method of existing tunnel malformation 5. control soft soil foundation pit as claimed in claim 4 underlies, feature It is, orthogonal thereto or oblique in newly-built underground structure (1) and existing tunnel structure (2) plane that underlies creates underground structure (1) include urban municipal road tunnel, subway tunnel, pipe gallery, humanoid underpass or other underground structures, underlie both Having tunnel structure (2) includes town road tunnel, subway tunnel, pipe gallery or other underground structures.
- The foundation reinforcement method of existing tunnel malformation 6. control soft soil foundation pit as claimed in claim 4 underlies, feature It is, the existing tunnel structure that underlies (2) two sides, centre and top position are respectively adopted cement mixing method (5) and carry out at reinforcing Reason；The existing tunnel structure that underlies (2) two sides stabilization zone (10) and intermediate stabilization zone (11) reinforcement depth are to the existing tunnel knot that underlies 5m is no less than below structure (2) bottom；Existing tunnel superstructure stabilization zone (12) distance that underlies underlie existing tunnel structure (2) top Portion is no less than 1m depth.
- The foundation reinforcement method of existing tunnel malformation 7. control soft soil foundation pit as described in claim 1 underlies, feature It is, the ash quantity of mixing of cement mixing method (5) is segmented adjustment from earth's surface down: from earth's surface to newly-built underground structure (1) top plate Position is low-mix ash quantity segment one (6), and mixing ash quantity is 5%；It is medium to mix ash quantity section between newly-built underground structure (1) roof and floor Two (7) of section, mixing ash quantity is 10%-15%；Underground structure (1) bottom plate is created the following are highly doped ash quantity and variable diameter segment three (8), is mixed Ash quantity is 25-40%.
- The foundation reinforcement method of existing tunnel malformation 8. control soft soil foundation pit as described in claim 1 underlies, feature It is, creating underground structure (1) bottom plate, the following are cement mixing method reducer (9), according to underlie existing tunnel structure (2) Deformation control requirement, different depth position expand stake diameter, by adjacent studs raised-diameter segment it is mutual overlap formed single layer or Multilayer plate horizontal reinforcing layer (13).
- The foundation reinforcement method of existing tunnel malformation 9. control soft soil foundation pit as described in claim 1 underlies, feature It is, the highly doped ash quantity of cement mixing method and variable diameter segment three (8) are formed in different location using different variable diameter modes and reinforced Body raised-diameter segment, including top variable diameter, middle part variable diameter, lower part variable diameter or the combination of upper middle lower part variable diameter；Cement mixing method is high Mix ash quantity and variable diameter segment three (8) using different construction machineries apply pillar raised-diameter segment or sawtooth pattern raised-diameter segment or Screw-type, screw, spherical stake diameter expand mode.
- The foundation reinforcement method of existing tunnel malformation 10. control soft soil foundation pit as described in claim 1 underlies, feature Be, uplift pile (4) couples position with single-layer or multi-layer plate reinforcing layer (13) in stake side grouting behind shaft or drift lining, it is ensured that uplift pile (4) with Effectively connection forms whole door case type safeguard structure between each other for newly-built underground structure (1) bottom plate, plate reinforcing layer (13).
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| CN110670631A (en) * | 2019-10-16 | 2020-01-10 | 宏润建设集团股份有限公司 | Supporting structure and excavation method of comprehensive pipe gallery foundation pit |
| CN112942300A (en) * | 2021-02-07 | 2021-06-11 | 杭州市市政工程集团有限公司 | Reinforcing structure of soil body above existing tunnel and construction method thereof |
| CN113802564A (en) * | 2021-09-24 | 2021-12-17 | 中水珠江规划勘测设计有限公司 | Construction method of deep foundation pit between existing operation tunnels |
| CN115450252A (en) * | 2022-09-05 | 2022-12-09 | 中铁四局集团第二工程有限公司 | Road tunnel construction structure above existing subway tunnel, foundation slab cushion layer and waterproof manufacturing method |
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| CN113802564B (en) * | 2021-09-24 | 2022-09-02 | 中水珠江规划勘测设计有限公司 | Construction method of deep foundation pit between existing operation tunnels |
| CN115450252A (en) * | 2022-09-05 | 2022-12-09 | 中铁四局集团第二工程有限公司 | Road tunnel construction structure above existing subway tunnel, foundation slab cushion layer and waterproof manufacturing method |
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| CN110284497B (en) | 2021-07-02 |
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