CN109403339A - The deep basal pit composite supporting construction and its method for protecting support of double-row pile combination method of center island - Google Patents
The deep basal pit composite supporting construction and its method for protecting support of double-row pile combination method of center island Download PDFInfo
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- CN109403339A CN109403339A CN201811203470.2A CN201811203470A CN109403339A CN 109403339 A CN109403339 A CN 109403339A CN 201811203470 A CN201811203470 A CN 201811203470A CN 109403339 A CN109403339 A CN 109403339A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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Abstract
一种双排桩结合中心岛法的深基坑复合支护结构及其支护方法，支护结构包括双排桩、冠梁、连梁和止水帷幕，还包括反压土台、腰梁、主体结构底板、支墩和钢支撑，反压土台为沿基坑中部土体进行中心岛开挖后预留于基坑侧壁周边的土台，钢支撑的一端与腰梁固定连接，钢支撑的另一端与支墩固定连接，钢支撑跨越反压土台或埋入反压土台的上部。本发明的双排桩结合中心岛开挖并辅以钢支撑和坑内预留反压土的支护方法，有效控制基坑水平位移，结合中心岛开挖可有效节省反压土的预留量、后期的挖除工作量，节省了大量内支撑、格构柱和立柱桩等的施工成本，实现坑内大面积无障碍的有效开挖和以及建筑物的快速施工，缩短工期。
A composite support structure for a deep foundation pit with double-row piles combined with a center island method and a support method thereof. The bottom plate, buttresses and steel supports of the main structure, the back pressure soil platform is the soil platform reserved around the side wall of the foundation pit after excavation of the central island along the soil in the middle of the foundation pit. One end of the steel support is fixedly connected to the waist beam, and the The other end is fixedly connected with the buttress, and the steel support spans the back pressure soil platform or is buried in the upper part of the back pressure soil platform. The double-row piles combined with the excavation of the central island and the supporting method of steel support and reserved back-pressure soil in the pit can effectively control the horizontal displacement of the foundation pit, and the reserved amount of the back-pressure soil can be effectively saved in combination with the excavation of the central island. , The excavation workload in the later period saves a lot of construction costs for internal supports, lattice columns and column piles, realizes effective excavation of large areas in the pit without barriers and rapid construction of buildings, and shortens the construction period.
Description
Technical field
The present invention relates to a kind of deep foundation pit supporting structure, especially a kind of double-row pile composite supporting construction and its supporting side
Method.
Background technique
In foundation pit supporting project, the door type structure that double-row pile is formed plus top crown beam and coupling beam has biggish side
To rigidity and overall stability, it can favorably control foundation pit deformation, shorten the construction period and reduce cost.Cantilevered double-row pile theory branch
Depth is protected generally in 10m or so, in conjunction with large area inner support or draws anchor that can increase supporting depth, but anchor support is to surrounding enviroment requirement
Harsh, large area inner support needs to occupy part construction space, extends the construction period.
Summary of the invention
The object of the present invention is to provide a kind of deep basal pit composite supporting construction of double-row pile combination method of center island and its supportings
Method, to solve existing Double-row Piles Support there are depth limits it is larger, surrounding enviroment are required it is harsh, occupy part construct it is empty
Between, construction period longer technical problem.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of deep basal pit composite supporting construction of double-row pile combination method of center island, including double-row pile, crown beam, coupling beam and sealing curtain
Curtain, the double-row pile includes preceding campshed and rear campshed, and preceding campshed and rear campshed are along vertical foundation pit side wall soil body direction time interval
Setting, together with the crown beam is respectively fixedly connected with along the stake top of preceding campshed with the stake top of rear campshed, before the coupling beam is fixedly connected
Twice crown beam afterwards, the rear side setting of campshed before the water-stop curtain is close to,
The deep basal pit composite supporting construction of the double-row pile combination method of center island further includes back-pressure earthen platform, waist rail, main structure bottom
Plate, main structure, buttress and bracing members,
The back-pressure earthen platform is to reserve after carrying out central island excavation along the soil body in the middle part of foundation pit in the earthen platform on foundation pit side-wall periphery, described
The front side of the immediately preceding campshed in back-pressure earthen platform,
The top of the front side of campshed, the top positioned at back-pressure earthen platform or embedment back-pressure earthen platform before the waist rail is fixedly connected on,
The main structure bottom plate is located in the substrate reserved after central island is excavated, and the buttress is fixedly connected on main structure bottom
The end of plate, the end are located at close to the side of foundation pit side-wall,
The bracing members are arranged along foundation pit interval, and one end of bracing members is fixedly connected with waist rail, the face that waist rail is connect with bracing members
It is vertical with bracing members,
The other end of bracing members is fixedly connected with buttress, and the bracing members are across back-pressure earthen platform and are positioned above or are partly embedded into
The top of back-pressure earthen platform.
The downside of coupling beam is fixedly connected at the top of the water-stop curtain, the elevation of bottom of the water-stop curtain is lower than front row
The elevation of bottom of stake and the elevation of bottom of rear campshed.
The cross-sectional shape of the back-pressure earthen platform is right-angled trapezium, and bevel edge tilts down.
The gradient of the bevel edge is 1:1.5-1:2.0.
The width at least 20m on the bottom edge of the back-pressure earthen platform, the back-pressure earthen platform are single-stage step or two stage steps or three
The step width of grade step, two stage steps or three-level step is from top to bottom successively decreased.
The buttress reinforced concrete block or fashioned iron block, the face that buttress is connect with bracing members is vertical with bracing members, the branch
The number of pier and the number of bracing members are identical, are arranged in a one-to-one correspondence with it.
The depth of the foundation pit is greater than 15m.
A kind of method for protecting support of the deep basal pit composite supporting construction using double-row pile combination method of center island, construction procedure is such as
Under:
Step 1 determines the diameter of double-row pile, the pilespacing of every campshed, the pilespacing of front and back campshed and anti-according to design and force analysis
The base width of firming platform, the length of the gradient of bevel edge and bracing members, tilt angle, prestress and construction location；
Step 2, successively construct in order preceding campshed, rear campshed, crown beam, coupling beam and water-stop curtain；
Step 3, foundation pit middle part carry out central island-type excavation, reserve back-pressure earthen platform on foundation pit periphery；
Step 4, when central island-type is excavated to substrate, in base upper portion construction main structure bottom plate；
Step 5, waist rail of constructing on preceding campshed, buttress of constructing on main structure bottom plate；
Step 6 sets up bracing members, while the main structure on main structure bottom plate in the middle part of construction foundation pit between waist rail and buttress；
Step 7, to main structure construction after, excavate back-pressure earthen platform；
Step 8, the construction foundation pit surrounding structure between preceding campshed and main structure exterior wall remove bracing members after completing support replacement.
Compared with prior art the invention has the characteristics that and the utility model has the advantages that
The present invention solves the Double-row Piles Support technical problem larger there are depth limit, and double-row pile combination central island excavation is simultaneously auxiliary
With the method for protecting support of reserved back-pressure soil in bracing members and hole, can be applied to soft clay area, high water level and cutting depth is more than 15m's
In super-sized foundation pit engineering.
Double-row pile combination bracing members and reserved back-pressure soil the central island digging mode phase in conjunction with simple double-row pile of the invention
Than supporting depth can be deepened, effectively control Foundation Pit；The reserved of back-pressure soil can effectively be saved by excavating in conjunction with central island
Amount, later period excavate workload, save the construction cost of a large amount of inner supports, lattice column and stand column pile etc..Present invention solution simultaneously
Having determined, it is harsh to require surrounding enviroment, occupies part construction space, and construction period longer technical problem realizes large area in cheating
It is accessible it is effective excavate and and building rapid construction, shorten the construction period.The present invention combines sealing curtain in high water level area
The use of curtain is effectively truncated or increases the percolation path of underground water inside and outside foundation pit, reduces underground water to the shadow of base pit engineering
It rings.
Detailed description of the invention
The present invention will be further described in detail with reference to the accompanying drawing.
Schematic diagram after the completion of the step of Fig. 1 is structural schematic diagram of the invention, construction method of the present invention six.
Schematic diagram after the completion of the step of Fig. 2 is construction method of the present invention three.
Schematic diagram after the completion of the step of Fig. 3 is construction method of the present invention five.
Schematic diagram after the completion of the step of Fig. 4 is construction method of the present invention seven.
Appended drawing reference: campshed after campshed, 2- before 1-, 3- crown beam, 4- coupling beam, 5- water-stop curtain, 6- bracing members,
7- back-pressure earthen platform, 71- bevel edge, the bottom edge 72-, 8- waist rail, 9- buttress, 10- main structure, 11- main structure bottom plate,
12- substrate.
Specific embodiment
Embodiment is shown in Figure 1, a kind of deep basal pit composite supporting construction of double-row pile combination method of center island, including double
Stake, crown beam 3, coupling beam 4 and water-stop curtain 5, the double-row pile include preceding campshed 1 and rear campshed 2, and preceding campshed 1 and rear campshed 2 are along vertical
Straight foundation pit side-wall soil body direction time interval setting, the crown beam 3 are solid respectively along the stake top of preceding campshed 1 and the stake top of rear campshed 2
Together, the coupling beam 4 is fixedly connected with front and back twice crown beam 3 for fixed connection, the rear side setting of campshed before the water-stop curtain 5 is close to.
The deep basal pit composite supporting construction of the double-row pile combination method of center island further includes back-pressure earthen platform 7, waist rail 8, main body
Structure base slab 11, main structure 10, buttress 9 and bracing members 6.
The back-pressure earthen platform 7 is to reserve after carrying out central island excavation along the soil body in the middle part of foundation pit in the soil on foundation pit side-wall periphery
Platform, the front side of the immediately preceding campshed 1 in the back-pressure earthen platform 7.
The front side of campshed 1, the top positioned at back-pressure earthen platform 7 or embedment back-pressure earthen platform before the waist rail 8 is fixedly connected on
Top.
The main structure bottom plate 11 is located in the substrate 12 reserved after central island is excavated, and the buttress 9 is fixedly connected on
The end of main structure bottom plate 11, the end are located at close to the side of foundation pit side-wall.
The bracing members 6 are arranged along foundation pit interval, and one end of bracing members 6 is fixedly connected with waist rail 8, waist rail 8 and bracing members 6
The face of connection is vertical with bracing members 6.
The other end of bracing members 6 is fixedly connected with buttress 9, the bracing members 6 across back-pressure earthen platform 7 and be positioned above or
It is partly embedded into the top of back-pressure earthen platform 7.
The top of the water-stop curtain 5 is fixedly connected on the downside of coupling beam 4, and the elevation of bottom of the water-stop curtain 5 is lower than
The elevation of bottom of preceding campshed 1 and the elevation of bottom of rear campshed 2.
The cross-sectional shape of the back-pressure earthen platform 7 is right-angled trapezium, and bevel edge 71 tilts down.
The gradient of the bevel edge 71 is 1:1.5-1:2.0.
The width at least 20m on the bottom edge 72 of the back-pressure earthen platform 7, the back-pressure earthen platform be single-stage step or two stage steps or
The step width of three-level step, two stage steps or three-level step is from top to bottom successively decreased.
9 reinforced concrete block of buttress or fashioned iron block, the face that buttress 9 is connect with bracing members 6 is vertical with bracing members 6, institute
The number for stating buttress 9 is identical as the number of bracing members 6, is arranged in a one-to-one correspondence with it.
The depth of the foundation pit is greater than 15m.
The method for protecting support of this deep basal pit composite supporting construction using double-row pile combination method of center island, construction procedure is such as
Under:
Step 1 determines the diameter of double-row pile, the pilespacing of every campshed, the pilespacing of front and back campshed and anti-according to design and force analysis
72 width of bottom edge of firming platform 7, the length of the gradient of bevel edge 71 and bracing members 6, tilt angle, prestress and construction position
It sets.
Step 2, successively construct in order preceding campshed 1, rear campshed 2, crown beam 3, coupling beam 4 and water-stop curtain 5.
Step 3, foundation pit middle part carry out central island-type excavation, reserve back-pressure earthen platform 7 on foundation pit periphery, shown in Figure 2.
Step 4, when central island-type is excavated to substrate 12, on the base 12 portion construct main structure bottom plate 11.
Step 5, waist rail 8 of constructing on preceding campshed, construct on main structure bottom plate 11 buttress 9, in practice of construction, waist
Beam 8 may be arranged at the top of back-pressure earthen platform 7, can also slightly shallow embedding can will be native around inside the upper surface of back-pressure earthen platform 7, when construction
Body is constructed waist rail after digging out.It is shown in Figure 3, it is the case where waist rail 8 may be arranged at the top of back-pressure earthen platform 7.
Step 6 sets up bracing members 6 between waist rail 8 and buttress 9, while on main structure bottom plate 11 in the middle part of construction foundation pit
Main structure 10, in practice of construction, bracing members 6 may be arranged at the top of back-pressure earthen platform 7, can also slightly shallow embedding in back-pressure earthen platform 7
Upper surface inside, construction steel support 6 after slotting can be carried out when construction to the soil body.It is shown in Figure 1, it is the slightly shallow embedding of bracing members 6
Situation inside the upper surface of back-pressure earthen platform 7.
Step 7 excavates back-pressure earthen platform 7 after constructing to main structure 10, shown in Figure 4.
Step 8, the construction foundation pit surrounding structure between 10 exterior wall of preceding campshed 1 and main structure are completed bracing members after support replacement
6 remove.
Claims (8)
1. a kind of deep basal pit composite supporting construction of double-row pile combination method of center island, including double-row pile, crown beam (3), coupling beam (4) and
Water-stop curtain (5), the double-row pile include preceding campshed (1) and rear campshed (2), and preceding campshed (1) and rear campshed (2) are along vertical foundation pit
The setting of side wall soil body direction time interval, the crown beam (3) are solid respectively along the stake top of preceding campshed (1) and the stake top of rear campshed (2)
Together, the coupling beam (4) is fixedly connected with front and back twice crown beam (3) for fixed connection, the rear side of campshed before the water-stop curtain (5) is close to
Setting, it is characterised in that:
The deep basal pit composite supporting construction of the double-row pile combination method of center island further includes back-pressure earthen platform (7), waist rail (8), main body
Structure base slab (11), main structure (10), buttress (9) and bracing members (6),
The back-pressure earthen platform (7) is to reserve after carrying out central island excavation along the soil body in the middle part of foundation pit in the earthen platform on foundation pit side-wall periphery,
The front side of the immediately preceding campshed of the back-pressure earthen platform (7) (1),
The waist rail (8) is fixedly connected on the front side of preceding campshed (1), the top for being located at back-pressure earthen platform (7) or embedment back-pressure earthen platform
(7) top,
The main structure bottom plate (11) is located in the substrate (12) reserved after central island is excavated, and the buttress (9) is fixedly connected
In the end of main structure bottom plate (11), which is located at close to the side of foundation pit side-wall,
The bracing members (6) are arranged along foundation pit interval, and one end of bracing members (6) is fixedly connected with waist rail (8), waist rail (8) and steel
Support the face of (6) connection vertical with bracing members,
The other end of bracing members (6) is fixedly connected with buttress (9), and the bracing members (6) are crossed over back-pressure earthen platform (7) and disposed thereon
Side or the top for being partly embedded into back-pressure earthen platform (7).
2. the deep basal pit composite supporting construction of double-row pile combination method of center island according to claim 1, it is characterised in that: institute
The downside that coupling beam (4) are fixedly connected at the top of water-stop curtain (5) is stated, the elevation of bottom of the water-stop curtain (5) is lower than front row
The stake elevation of bottom of (1) and the elevation of bottom of rear campshed (2).
3. the deep basal pit composite supporting construction of double-row pile combination method of center island according to claim 1, it is characterised in that: institute
The cross-sectional shape for stating back-pressure earthen platform (7) is right-angled trapezium, and bevel edge (71) tilts down.
4. the deep basal pit composite supporting construction of double-row pile combination method of center island according to claim 1, it is characterised in that: institute
The gradient for stating bevel edge (71) is 1:1.5-1:2.0.
5. the deep basal pit composite supporting construction of double-row pile combination method of center island according to claim 4, it is characterised in that: institute
The width at least 20m on the bottom edge (72) of back-pressure earthen platform (7) is stated, the back-pressure earthen platform is single-stage step or two stage steps or three-level platform
The step width of rank, two stage steps or three-level step is from top to bottom successively decreased.
6. the deep basal pit composite supporting construction of double-row pile combination method of center island according to claim 1, it is characterised in that: institute
Buttress (9) reinforced concrete block or fashioned iron block are stated, the face that buttress (9) is connect with bracing members (6) is vertical with bracing members, the buttress
(9) number is identical as the number of bracing members (6), is arranged in a one-to-one correspondence with it.
7. the deep basal pit composite supporting construction of double-row pile combination method of center island according to claim 1, it is characterised in that: institute
The depth for stating foundation pit is greater than 15m.
8. a kind of deep basal pit composite supporting construction using double-row pile combination method of center island described in claim 1-7 any one
Method for protecting support, which is characterized in that construction procedure is as follows:
Step 1 determines the diameter of double-row pile, the pilespacing of every campshed, the pilespacing of front and back campshed and anti-according to design and force analysis
Bottom edge (72) width of firming platform (7), the gradient of bevel edge (71) and length, the tilt angle, prestress of bracing members (6)
And construction location；
Step 2, successively construct in order preceding campshed (1), rear campshed (2), crown beam (3), coupling beam (4) and water-stop curtain (5)；
Step 3, foundation pit middle part carry out central island-type excavation, reserve back-pressure earthen platform (7) on foundation pit periphery；
Step 4 when central island-type is excavated to substrate (12), constructs main structure bottom plate (11) on substrate (12) top；
Step 5 is constructed waist rail (8) on preceding campshed, constructs buttress (9) on main structure bottom plate (11)；
Step 6 sets up bracing members (6) between waist rail (8) and buttress (9), while on main structure bottom plate (11) in construction foundation pit
The main structure (10) in portion；
Step 7 excavates back-pressure earthen platform (7) after constructing to main structure (10)；
Step 8, the construction foundation pit surrounding structure between preceding campshed (1) and main structure (10) exterior wall are completed bracing members after support replacement
(6) it removes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811203470.2A CN109403339B (en) | 2018-10-16 | 2018-10-16 | Deep foundation pit composite supporting structure combining double-row piles with center island method and supporting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811203470.2A CN109403339B (en) | 2018-10-16 | 2018-10-16 | Deep foundation pit composite supporting structure combining double-row piles with center island method and supporting method thereof |
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| CN109403339A true CN109403339A (en) | 2019-03-01 |
| CN109403339B CN109403339B (en) | 2024-01-23 |
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| CN201811203470.2A Expired - Fee Related CN109403339B (en) | 2018-10-16 | 2018-10-16 | Deep foundation pit composite supporting structure combining double-row piles with center island method and supporting method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110318402A (en) * | 2019-07-01 | 2019-10-11 | 广东建星建造集团有限公司 | A kind of deep basal pit back-pressure soil adds diagonal brace form construction method for supporting |
| CN111501776A (en) * | 2020-04-16 | 2020-08-07 | 温州设计集团有限公司 | A device applied to foundation pit oblique throwing support and its construction method |
| CN112921987A (en) * | 2021-04-19 | 2021-06-08 | 湖南大学 | Deep foundation pit supporting structure and deep foundation pit construction method |
| CN113356230A (en) * | 2021-06-24 | 2021-09-07 | 中国建筑第二工程局有限公司 | Foundation pit support construction method based on combination of back pressure soil and prestressed steel support |
| CN114991161A (en) * | 2021-03-02 | 2022-09-02 | 长沙理工大学 | Protection technology for reducing mutual influence of excavation of foundation pit and operation of adjacent tunnel |
| CN116084424A (en) * | 2023-03-15 | 2023-05-09 | 广东省第一建筑工程有限公司 | Deep foundation pit construction method for shallow tunnels of subway in karst development area |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110318402A (en) * | 2019-07-01 | 2019-10-11 | 广东建星建造集团有限公司 | A kind of deep basal pit back-pressure soil adds diagonal brace form construction method for supporting |
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| CN114991161A (en) * | 2021-03-02 | 2022-09-02 | 长沙理工大学 | Protection technology for reducing mutual influence of excavation of foundation pit and operation of adjacent tunnel |
| CN112921987A (en) * | 2021-04-19 | 2021-06-08 | 湖南大学 | Deep foundation pit supporting structure and deep foundation pit construction method |
| CN113356230A (en) * | 2021-06-24 | 2021-09-07 | 中国建筑第二工程局有限公司 | Foundation pit support construction method based on combination of back pressure soil and prestressed steel support |
| CN116084424A (en) * | 2023-03-15 | 2023-05-09 | 广东省第一建筑工程有限公司 | Deep foundation pit construction method for shallow tunnels of subway in karst development area |
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|---|---|
| CN109403339B (en) | 2024-01-23 |
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