CN209722983U - Close on the irregular deep basal pit group comprehensive support structure of high-speed railway - Google Patents
Close on the irregular deep basal pit group comprehensive support structure of high-speed railway Download PDFInfo
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- CN209722983U CN209722983U CN201920174665.2U CN201920174665U CN209722983U CN 209722983 U CN209722983 U CN 209722983U CN 201920174665 U CN201920174665 U CN 201920174665U CN 209722983 U CN209722983 U CN 209722983U
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Abstract
The utility model discloses a kind of irregular deep basal pit group comprehensive support structures for closing on high-speed railway.A kind of irregular deep basal pit group comprehensive support structure for closing on high-speed railway includes the north side property foundation pit and southern side property foundation pit, diaphram wall, three axes agitating pile reinforcing body, large circle concrete inner support of high-speed railway, middle part Metro station excavation and its two sides.The surrounding of north side property foundation pit is arranged in the diaphram wall；The outside with high-speed railway apart from nearest diaphram wall is arranged in the three axes agitating pile reinforcing body；The large circle concrete inner support is arranged on the longitudinal direction of north side property foundation pit, southern side property foundation pit.The utility model comprehensively utilizes strengthening supporting rigidity, reinforces isolation and the measure of bottomed sealing in advance, effectively controls deep basal pit group's construction period to the adverse effect of high-speed railway, it is ensured that railway operation safety.
Description
Technical field
The utility model belongs to underground space development field, and in particular to be a kind of to close on not advising for high-speed railway
Then deep basal pit group comprehensive support structure.
Background technique
Increasing recently as Urban Underground Space Excavation project, it is big, irregular, multiple that base pit engineering shows scale
The high development trend of miscellaneous degree, how in the intensive city of construction of structures safety, economical, efficient carry out the underground space and open
Hair, it has also become one of each scientific research institution, the key issues of designing unit's research.It, can not in each stage of Design of Excavation Project
The restriction by surrounding enviroment factor avoided, such as major urban arterial highway, urban viaduct, railway and building, excavation of foundation pit
Certain disturbance is generated to the construction of structures that these are closed on, and causes greatly design and construction risk；Especially closing on high iron wire
When road region carries out large-scale deep pit digging, more strict requirements are proposed to the supporting measure of deep basal pit.
To protect the construction of structures for closing on deep pit digging, excavation of foundation pit is reduced to the unfavorable shadow of periphery construction of structures bring
It rings, engineering circles propose many safeguard measures in recent years.As " a kind of support reinforcement structure of deep basal pit " (number of patent application:
201621129478.5), by the way that multiple isolation piles are being arranged between protection building and foundation pit, and between isolation pile and foundation pit
The soil body multiple injected holes be set carry out slip castings as reinforcement measure, it is intended to reduce foundation pit deformation, thus to close to deep basal pit
Building is protected.But the method only protects building by limitation foundation pit active deformation, it is this to high-speed railway right
Deformation has the important protected object effect of strict demand not ideal enough.A kind of for another example " subway of control Nearby Structure deformation
Stand foundation ditch construction method " (number of patent application: 201610150987.4), by using half against method, from construction way
Enclosure wall Time Over Head is controlled, to control the deformation of building enclosure.But this engineering method difficulty of construction is very big, construction organization is wanted
Ask high, convenience for construction poor, it is poor to foundation pit group's applicability that the construction period is nervous and cutting depth is inconsistent.
Utility model content
The purpose of the utility model is to overcome the deficiency of above-mentioned single protection technique, a kind of high-speed railway that closes on is proposed
Irregular deep basal pit group's comprehensive support structure, the utility model utilize strengthening supporting rigidity, in advance reinforcing isolation and bottomed sealing
A series of integrated protection measures, effectively control deep basal pit group's construction period to the adverse effect of high-speed railway.
The purpose of the utility model is to provide a kind of irregular deep basal pit group comprehensive support structures for closing on high-speed railway.One
It includes high-speed railway, middle part Metro station excavation and its two that kind, which closes on the irregular deep basal pit group comprehensive support structure of high-speed railway,
Branch in the north side property foundation pit and southern side property foundation pit, diaphram wall, three axes agitating pile reinforcing body, large circle concrete of side
Support.The surrounding of north side property foundation pit is arranged in the diaphram wall；Three axes agitating pile reinforcing body setting with high-speed iron
Outside of the road apart from nearest diaphram wall；The large circle concrete inner support is arranged in north side property foundation pit, southern side object
On the longitudinal direction of industry foundation pit.
Further, the diaphram wall is made of top stress section and infrastructure section；The construction section enters rock
Depth is not less than 5.0m.
Further, the three axes agitating pile reinforcing body is parallel with high-speed railway, and both ends are each along diaphram wall outer edge
Extension 5.0m, depth are slightly deeper than north side property foundation pit；The three axes agitating pile reinforcing body is by diameter 850mm, and the five of spacing 600mm
Three axes agitating pile is arranged to constitute.
Further, three large circle concrete inner supports are set up in foundation depth side；The large circle concrete
The spacing of inner support is controlled in 5.0m~6.0m；The center of circle of the annulus support and property foundation pit centroid distance are not more than 8.0m.
The utility model has the following beneficial effects:
1. three axes agitating pile reinforcing body is arranged in the foundation pit outer edge for closing on high-speed iron trackside in advance, can both realize to high speed
The protection of railway, and the risk during continuous wall trench underground can be reduced.
2. diaphram wall protrudes into basement rock in a manner of increasing construction section, enclosure wall and water-stop curtain are combined into one, one
Aspect effectively blocks hydraulic connection inside and outside foundation pit, on the other hand reduces working procedure, accelerates construction speed.
3. by advance reinforce isolation, a series of integrated protection measures of strengthening supporting rigidity, bottomed sealing, overcome with
Toward the limitation of single reinforcing method, the deformation in foundation pit group's digging process is effectively limited, is reduced to closing on high-speed iron
The adverse effect on road.
Detailed description of the invention
Foundation pit group's plan view of Fig. 1 the utility model.
Fig. 2 is the irregular deep basal pit group comprehensive support structural schematic diagram for closing on high-speed railway.
Fig. 3 is three axes agitating pile reinforcing body floor map.
Fig. 4 is diaphram wall diagrammatic cross-section.
Fig. 5 is large circle concrete inner support floor map.
Fig. 6 is settlement monitoring curve on the outside of high-speed railway.
In figure: 1-high-speed railway；2-north side property foundation pits；3-middle part Metro station excavations；4-southern side property foundation pits；
5-middle part main structure of subway station；6-three axes agitating pile reinforcing bodies；7-large circle concrete inner supports；The support of 9-annulus；
10-radial rod pieces；11-struts；13-diaphram walls；14-high-speed railway displacement observation points；15-stress sections；16-structures
Make section.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments.
Present embodiment discloses a kind of irregular deep basal pit group comprehensive support structure for closing on high-speed railway, institute referring to Fig.1
Show, embodiment foundation pit group is by the irregular north side property foundation pit 2 of flat shape, middle part Metro station excavation 3, southern side property foundation pit
4 three foundation pit compositions are being high-speed railway 1, total 2.19 ten thousand m of excavation area of foundation pit at 4 about 22.9m of north side property foundation pit2,
Above-mentioned foundation pit group cutting depth is respectively 14.4m, 26.5m and 15.9m.Wherein, southern side and north side do not imply that actual south
Side and north side, it is merely meant that not being the restriction to position in subway two sides.
Referring to shown in Fig. 2, a kind of irregular deep basal pit group comprehensive support structure for closing on high-speed railway further includes that setting exists
The diaphram wall 13 of 2 surrounding of north side property foundation pit is arranged in high-speed railway 1 apart from nearest 13 outside of diaphram wall
Three axes agitating pile reinforcing body 6 is arranged in north side property foundation pit 2, the longitudinal large circle concrete inner support of southern side property foundation pit 4
7。
The construction method for closing on the irregular deep basal pit group comprehensive support structure of high-speed railway, includes the following steps:
Step 1, construction and excavation depth is most deep and apart from the farther away middle part Metro station excavation 3 of high-speed railway 1, applies simultaneously
The three axes agitating pile reinforcing body 6 in 1 outside of work high-speed railway；
Step 2, after the completion of the three axes agitating pile reinforcing body 6 is constructed, the construction bottomed underground of north side property foundation pit 2 is continuous
Wall 13；
Step 3 after at middle part, 5 top plate of main structure of subway station is poured, is constructed farthest apart from high-speed railway 1
Southern side property foundation pit 4；After last one of large circle concrete inner support 7 of southern side property foundation pit 4 forms intensity, distance of constructing
The nearest north side property foundation pit 2 of high-speed railway 1.
As shown in figure 3, high-speed railway 1 and 2 minimum distance of deep basal pit are 22.9m, three axes agitating pile reinforcing body 6 closely under
13 outer wall of diaphragm wall arrangement, length 19m, width 3.25m, depth 15m.Three axes agitating pile reinforcing body 6 by diameter 850mm,
Five row's three axes agitating piles away from 600mm are constituted, and using " one hole method of socket " construction, wherein cement is common using P.O.42.5 grades
Portland cement, cement mixed weight 15%, 1.0~1.5, stirring subsidence velocity is preferably controlled in 0.5m/min for ratio of mud control
~0.8m/min promotes speed and is preferably less than 1.0m/min, and spray pressure is not preferably greater than 0.8MPa, and remains a constant speed or mention
It rises, soil body unconfined compressive strength qu >=1.2MPa after 28d is reinforced.
After the completion of three axes agitating pile reinforcing body 6 is constructed, the bottomed diaphram wall 13 for the north side property foundation pit 2 that can construct, resistance
Hydraulic connection inside and outside disconnected foundation pit, high-speed railway caused by being effectively reduced because of withdrawal settle.As shown in figure 4, bottomed underground
Continuous wall thickness 0.8m, overall length 43m are made of, wherein stress segment length stress section 15 (26m) and construction section 16 (17m) two parts
Degree is according to building enclosure Calculation and Analysis of Force result value.Construction section 16 enters rock depth not less than 5.0m, needs a grooving, connects
It is continuous to pour completion, it is poured using C35P8 impervious concrete.Diaphram wall stress section 15 excavates side arrangement of reinforcementIt meets
Native side arrangement of reinforcementConstructing 16 two sides arrangement of reinforcement of section isTo ensure that ground-connecting-wall has better antiseepage
I-shaped shaped-steel joint, steel section size H686 × 650 × 10 × 10 are arranged between each slot section connector of diaphram wall 13 in performance.
As shown in figure 5, large circle concrete inner support 7 is centered on annulus support 9.The diameter of annulus support 9 is 66m, circle
The heart and North property foundation pit centroid distance are not more than 8m.Foundation pit periphery soil pressure will be transmitted to by strut 11, radial rod piece 10
In annulus support 9.Three large circle concrete inner supports 7 are arranged in elevation 19.324m, 13.624m and 8.624m of property foundation pit,
Above-mentioned three layers of large circle inner support spacing on foundation depth direction is preferably controlled in 5.0m~6.0m, and first layer annulus supports 9 sections
Size 1.4m × 1.0m (wide × high), second layer annulus support 9 sectional dimension 2.5m × 1.2m (wide × high), third layer annulus support 9
Sectional dimension 2.0m × 1.2m (wide × high), radial rod piece 10 and 11 sectional dimension of strut are 1.2m × 1.0m.Pass through Milky Way
After V2015, Tongji University's tri- kinds of software for calculation analytical calculations of Venus FRWS and Midas GTS, caused by North property foundation pit 2 excavates
High-speed railway largest settlement is decreased to 8.124mm, meets high-speed railway and operates normally requirement.
After above-mentioned integrated protection measure, to high-speed railway displacement observation point in 2 digging process of north side property foundation pit
14 carry out periodic monitoring.As shown in fig. 6, can be seen that from monitoring data, the deformation values of high-speed railway 1 reach during the 28-60d that constructs
To maximum value, and rate of deformation is very fast；The deflection of high-speed railway gradually tends towards stability after construction 60d, in non-fragment orbit
Settling amount is not more than in the range of 15mm, to verify, integrated protection measure scheme in the utility model patent is feasible, effect
Preferably.
Foregoing description is only the description to the utility model preferred embodiment, not to any limit of the scope of the utility model
Fixed, any change, the modification that the those of ordinary skill in the utility model field does according to the disclosure above content belong to right and want
Seek the protection scope of book.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
Claims (4)
1. closing on the comprehensive support structure of the irregular deep basal pit group of high-speed railway, which is characterized in that include
High-speed railway (1)；
Deep basal pit group, north side property foundation pit (2), southern side property foundation pit comprising middle part Metro station excavation (3) and its two sides
(4), wherein north side property foundation pit (2) apart from high-speed railway (1) recently, southern side property foundation pit (4) apart from high-speed railway (1) most
Far；
The surrounding in north side property foundation pit (2) is arranged in diaphram wall (13)；
Three axes agitating pile reinforcing body (6) is arranged in the outside with high-speed railway (1) apart from nearest diaphram wall (13)；
Large circle concrete inner support (7), be arranged north side property foundation pit (2), southern side property foundation pit (4) longitudinal direction on.
2. the comprehensive support structure of the irregular deep basal pit group according to claim 1 for closing on high-speed railway, feature exist
In: the diaphram wall (13) is made of top stress section (15) and infrastructure section (16)；Construction section (16) enters
Rock depth is not less than 5.0m.
3. the comprehensive support structure of the irregular deep basal pit group according to claim 1 or 2 for closing on high-speed railway, feature
Be: the three axes agitating pile reinforcing body (6) is parallel with high-speed railway (1), and both ends are each outer along diaphram wall (13) outer edge
Prolong 5.0m, depth is slightly deeper than north side property foundation pit (2)；The three axes agitating pile reinforcing body (6) is by diameter 850mm, spacing 600mm
Five row's three axes agitating piles constitute.
4. the comprehensive support structure of the irregular deep basal pit group according to claim 2 for closing on high-speed railway, feature exist
In: three large circle concrete inner supports (7) are set up in foundation depth side；The large circle concrete inner support (7)
Spacing is controlled in 5.0m~6.0m；The center of circle of the annulus support (9) and property foundation pit centroid distance are not more than 8m.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653212A (en) * | 2019-01-31 | 2019-04-19 | 长江勘测规划设计研究有限责任公司 | Close on the irregular deep basal pit group comprehensive support structure and construction method of high-speed railway |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653212A (en) * | 2019-01-31 | 2019-04-19 | 长江勘测规划设计研究有限责任公司 | Close on the irregular deep basal pit group comprehensive support structure and construction method of high-speed railway |
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