CN108842820A - A kind of subway station transfer node section foundation ditch construction method - Google Patents

A kind of subway station transfer node section foundation ditch construction method Download PDF

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Publication number
CN108842820A
CN108842820A CN201810944500.9A CN201810944500A CN108842820A CN 108842820 A CN108842820 A CN 108842820A CN 201810944500 A CN201810944500 A CN 201810944500A CN 108842820 A CN108842820 A CN 108842820A
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China
Prior art keywords
foundation pit
construction
area
section
pit
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CN201810944500.9A
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熊胜
尹晨
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China Railway No 5 Engineering Group Co Ltd
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China Railway No 5 Engineering Group Co Ltd
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Priority to CN201810944500.9A priority Critical patent/CN108842820A/en
Publication of CN108842820A publication Critical patent/CN108842820A/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • E02D29/05Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
    • E02D29/055Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench further excavation of the cross-section proceeding underneath an already installed part of the structure, e.g. the roof of a tunnel
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C1/00Design or layout of roads, e.g. for noise abatement, for gas absorption
    • E01C1/04Road crossings on different levels; Interconnections between roads on different levels
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges

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  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)

Abstract

The present invention provides a kind of subway station transfer node section foundation ditch construction method, including divides construction area, construction foundation pit building enclosure, applies crown beam and top concrete support, set up steel suspension bridge, successively excavate foundation pit paragraph by paragraph and set up waist rail, excavate pit under node area, applying bottom plate.Section is changed to because unearthed hole or hole for hoist can not be arranged in subway station, foundation pit construction relative difficulty, using technical solution provided by the invention, take first construction reference area depth bounds foundation pit, it constructs again pit under node area, and work nest and linking gug are set in node area bottom of foundation ditch, effectively solve the problems, such as that node section excavation of foundation pit is unearthed and equipment passes in and out.Using technical solution provided by the invention, construction technology is easy, speed is fast, less investment, under the premise of guaranteeing security of foundation ditch construction and quality, work efficiency can be improved, shortens the construction period, reduce cost, road pavement traffic order is avoided to have an impact, brings preferable economic benefit and social benefit to construction enterprises.

Description

A kind of subway station transfer node section foundation ditch construction method
Technical field
The present invention relates to Metro station excavation technical field of construction more particularly to a kind of subway station transfer node section foundation pits Construction method.
Background technique
In the process of construction of subway station, excavation of foundation pit is an important working procedure, and the selection of construction method is not Only meet the use function of engineering itself, while meeting rationally using ground, the requirement of the underground useful space, and consider due to construction The influence that surrounding enviroment are generated.Subway station main construction method has cut and cover method, cap excavation method, subsurface excavation method at this stage, is located at steel Transfer node section generally uses top-down straight method method to construct under suspension bridge.Because needing open city road normal traffic above steel suspension bridge, and Unearthed hole or hole for hoist can not be set, transfer node section deep foundation pit construction is limited by limited working space, local job's distance compared with Greatly, construct relative difficulty, especially transfer node section foundation pit under pit excavation construction because being limited by the confined space, construction efficiency compared with Low, construction speed is slow, and security risk is big, causes large effect to station integral construction duration and cost control.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of subway station transfer node section foundation ditch construction methods.
The present invention is achieved by the following technical programs, is included the following steps:
Step 1:Divide construction area:Construction area is set in the place for needing to excavate foundation pit, construction area is divided into Node area and standard regions, node area is for being arranged subway station transfer node;
Step 2:Along construction area inside edge below ground described in step 1, by machine drilling, steel pipe soil compaction or The means such as manpower excavation form stake holes in layer of ground soil, and coagulate after placing steel reinforcement cage, concrete perfusion in it to concrete Gu several cast-in-situ bored piles are made later, then below ground buries several interim central posts in the middle part of the construction area;
Step 3:A gutter is excavated along construction area outer ledge, removes all ponding in construction area;
Step 4:The earthwork between adjacent two cast-in-situ bored piles described in step 2 is excavated to preset depth using excavator After degree, then the top of above-mentioned two cast-in-situ bored piles of chipping, at the top of above-mentioned two cast-in-situ bored piles on set up one section of crown beam Section, then the casting concrete on the crown beam section again, obtains concrete support section;
Step 5:Step 4 is repeated, the multistage crown beam section obtained is made successively will to be connected to one at the top of all cast-in-situ bored piles It rises, obtains top crown beam, so that the Multi-section concrete supporting section obtained is linked together and form top concrete support;
Step 6:Layer of ground soil within construction area is excavated using excavator, will be excavated according to the length of construction area Journey is divided into multistage excavation, excavates paragraph by paragraph along construction area length direction, one section of Component units section foundation pit of every excavation, every segment unit Spacing or cast-in-situ bored pile and adjacent interim between any adjacent two interim central post described in section foundation pit width and step 2 Spacing is consistent between central post;
Step 7:The mining process of every segment unit section foundation pit is divided into multilayer according to preset foundation pit excavating depth to excavate, It successively being excavated according to top-down direction, one layer of Component units layer foundation pit of every excavation often excavates a layer unit layer foundation pit, if The elementary layer foundation pit is located within standard regions, then set up within the elementary layer foundation pit connection cast-in-situ bored pile with temporarily in Steel pipe support between column or between the adjacent two interim central posts of connection is as waist rail, if the elementary layer foundation pit is located at node Within area, then a concrete support is set up as waist rail using the method for concreting within the elementary layer foundation pit;
Step 8:Step 6 is repeated to step 7, so that all elementary section foundation pits excavated is interconnected becomes foundation pit;
Step 9:Correspond to node area or less at the Foundation Pit bottom excavated and excavate the earthwork, excavates section in bottom of foundation ditch Pit under point area, then pit two sides adjacent domain excavates work nest respectively under node area;
Step 10:Concrete is filled to work nest slot bottom described in step 9, after filled concrete setting, forms bottom Plate, then all steel pipe supports and concrete support are removed.
Foundation ditch construction method is further comprising the steps of at the subway station transfer:
It is carrying out between step 5 and step 6, is being supported using the top concrete as support, in the top coagulation A steel suspension bridge is set up on soil support.
It is embedded in cast-in-situ bored pile depth within node area ground in step 2 it is greater than and is embedded in the standard regions Cast-in-situ bored pile depth 2m~3m within ground.
When burying interim central post in step 2, if the interim central post is located within standard regions, the interim central post Lattice column is used, if the interim central post is located within node area, which uses concrete filled steel tubular column.
It along the sequence that construction area length direction excavates elementary section foundation pit is paragraph by paragraph by construction area described in step 6 It is symmetrically excavated paragraph by paragraph to both sides at middle part.
Pit surrounding inner wall is relative to perpendicular into the slope surface at 30 °~45 ° inclination angles under node area described in step 9.
It further include to the elementary layer foundation pit surrounding excavated during successively excavating elementary layer foundation pit described in step 8 Inner wall uses Bolt net and jet gib or Larsen steel sheet pile gib.
It further include being excavated using step roll-back method slope during successively excavating elementary layer foundation pit described in step 8, The step gradient is 1:1.
The beneficial effects of the present invention are:Using technical solution provided by the invention, according to " longitudinal divisions, vertical layered " " fluting support, first support digs afterwards, with digging with supportting, forbid to backbreak " principle, node area foundation pit is with standard regions foundation pit with depth model Foundation pit synchronous construction by their entirety in enclosing, take from node area foundation pit two sides toward intermediate symmetry, segmentation, stage excavation sequence, have Effect solves the problems, such as that node area foundation pit construction is limited by the confined space;In pit under excavating node area, by the way that work is arranged Slot and linking gug, expand construction space, provide lower pit operation platform, can be convenient construction equipment into Out, make construction more convenient, so as to shorten the construction period, improve construction efficiency, using construction method provided by the invention, apply Work process is simple, and required investment technological equipment or resource are less, and avoid the influence of road pavement traffic order, to apply Work enterprise brings good economic benefit and social benefit.
Detailed description of the invention
Fig. 1 is section structure diagram of the present invention along construction area transverse cross sectional;
Fig. 2 is section structure diagram of the present invention along construction area longitudinally cutting.
In figure:1- cast-in-situ bored pile, the interim central post of 2-, the top 3- crown beam, the support of 4- top concrete, 5- steel suspension bridge, 6- waist rail, 7- bottom plate, the standard regions 8-, 9- node area, pit under 10- node area, 11- work nest.
Specific embodiment
Be described further below technical solution of the present invention, but claimed range be not limited to it is described.
The present invention provides a kind of subway station transfer node section foundation ditch construction method, as shown in Figure 1 and Figure 2, including following step Suddenly:
Step 1:Divide construction area:Construction area is set in the place for needing to excavate foundation pit, construction area is divided into Node area 9 and standard regions 8, node area 9 is for being arranged subway station transfer node;
Step 2:Along step 1 construction area inside edge below ground, pass through machine drilling, steel pipe soil compaction or manpower The means such as excavate and form stake holes in layer of ground soil, and place in it steel reinforcement cage, after concrete perfusion to concrete setting it After several cast-in-situ bored piles 1 are made, then below ground buries several interim central posts 2 in the middle part of construction area;Further Ground is further embedded in 1 depth of cast-in-situ bored pile within 9 ground of node area and is greater than and be embedded within 8 ground of standard regions 1 depth 2m~3m of cast-in-situ bored pile.When burying interim central post 2, if the interim central post 2 is located within standard regions 8, this faces When central post 2 use lattice column, if the interim central post 2 is located within node area 9, the interim central post 2 use steel pipe concrete Column.Further, spacing is 20m~30m between any adjacent two cast-in-situ bored pile 1.
Step 3:A gutter is excavated along construction area outer ledge, removes all ponding in construction area;
Step 4:The earthwork between adjacent two cast-in-situ bored piles 1 of step 2 is excavated to preset depth using excavator Afterwards, then the top of above-mentioned two cast-in-situ bored piles 1 of chipping, one section of crown beam is set up on above-mentioned two cast-in-situ bored piles, 1 top Section, then the casting concrete on the crown beam section again, obtains concrete support section;
Step 5:Step 4 is repeated, the multistage crown beam section obtained is made successively will to be connected to one at the top of all cast-in-situ bored piles 1 It rises, obtains top crown beam 3, so that the Multi-section concrete supporting section obtained is linked together and form top concrete support 4;
Step 6:Layer of ground soil within construction area is excavated using excavator, will be excavated according to the length of construction area Journey is divided into multistage excavation, excavates paragraph by paragraph along construction area length direction, one section of Component units section foundation pit of every excavation, every segment unit In section foundation pit width and step 2 between any adjacent two interim central post 2 spacing or cast-in-situ bored pile 1 and it is adjacent it is interim in Spacing is consistent between column 2;It further, is by applying along the sequence that construction area length direction excavates elementary section foundation pit paragraph by paragraph It is symmetrically excavated paragraph by paragraph in the middle part of the domain of work area to both sides.Further, elementary section foundation pit length is not more than 6m in step 6.
Step 7:The mining process of every segment unit section foundation pit is divided into multilayer according to preset foundation pit excavating depth to excavate, It successively being excavated according to top-down direction, one layer of Component units layer foundation pit of every excavation often excavates a layer unit layer foundation pit, if The elementary layer foundation pit is located within standard regions 8, then set up within the elementary layer foundation pit connection cast-in-situ bored pile 1 with temporarily Steel pipe support between central post 2 or between the adjacent two interim central posts 2 of connection is as waist rail 6, if the elementary layer foundation pit position Within node area 9, then a concrete support conduct is set up using the method for concreting within the elementary layer foundation pit Waist rail 6;Further, elementary layer foundation depth is not more than 3m.
Step 8:Step 6 is repeated to step 7, so that all elementary section foundation pits excavated is interconnected becomes foundation pit;Into One step, it further include to the elementary layer foundation pit surrounding inner wall excavated using anchor net during successively excavating elementary layer foundation pit Spray gib or Larsen steel sheet pile gib.It further include being fallen back using step during successively excavating elementary layer foundation pit Method slope is excavated, and the step gradient is 1:1.Further, step 8 further includes interconnecting all elementary section foundation pits excavated mutually The earthwork that is logical and then being 0.3 meter by manual method excavating depth, keeps the space excavated and all elementary section foundation pits mutual Connection forms foundation pit.
Step 9:Correspond to 9 or less node area at the Foundation Pit bottom excavated and excavate the earthwork, excavates section in bottom of foundation ditch Pit 10 under point area, then 10 two sides adjacent domain of pit excavates work nest 11 respectively under node area;Further, work nest 11 specification is length × wide × depth=6m × 4m × 2m.Under node area 10 surrounding inner wall of pit be relative to perpendicular at The slope surface at 30 °~45 ° inclination angles.
Step 10:Concrete is filled to 11 slot bottom of step 9 work nest, after filled concrete setting, forms bottom plate 7, then all steel pipe supports and concrete support are removed.
Further, foundation ditch construction method is further comprising the steps of at the transfer of subway station:
It is carrying out between step 5 and step 6, using top concrete support 4 as support, is supporting 4 in top concrete On set up a steel suspension bridge 5.
Further, subway station transfer node section foundation ditch construction method further includes after carrying out step 8, in foundation pit Within corner excavate sump, inwardly excavate several open drains along foundation pit inner sidewall, arbitrary neighborhood two rows At a distance of 20m between the bright ditch of water.
Using technical solution provided by the invention, according to " longitudinal divisions, vertical layered " and " fluting support, first support dig afterwards, With digging with supportting, forbid to backbreak " principle, node area foundation pit and standard regions foundation pit in depth bounds by their entirety foundation pit synchronize apply Work, take from node area foundation pit two sides toward intermediate symmetry, segmentation, stage excavation sequence, efficiently solve node area foundation pit and apply The problem of work is limited by the confined space;In pit under excavating node area, by setting work nest and linking gug, expand Construction space provides lower pit operation platform, can be convenient construction equipment pass in and out, make construction it is more convenient, thus The construction period is shortened, construction efficiency is improved, using construction method provided by the invention, construction technique is simple, required It puts into technological equipment or resource is less, and avoid the influence of road pavement traffic order, brought for construction enterprises good Economic benefit and social benefit.

Claims (8)

1. a kind of subway station transfer node section foundation ditch construction method, it is characterised in that:Include the following steps:
Step 1:Divide construction area:Construction area is set in the place for needing to excavate foundation pit, construction area is divided into node Area (9) and standard regions (8), node area (9) are for being arranged subway station transfer node;
Step 2:Along construction area inside edge below ground described in step 1, pass through machine drilling, steel pipe soil compaction or manpower The means such as excavate and form stake holes in layer of ground soil, and place in it steel reinforcement cage, after concrete perfusion to concrete setting it After several cast-in-situ bored piles (1) are made, then below ground buries several interim central posts in the middle part of the construction area (2);
Step 3:A gutter is excavated along construction area outer ledge, removes all ponding in construction area;
Step 4:The earthwork between adjacent two cast-in-situ bored piles (1) described in step 2 is excavated to preset depth using excavator After degree, then the top of above-mentioned two cast-in-situ bored piles (1) of chipping, one is set up on above-mentioned two cast-in-situ bored piles (1) top Duan Guanliang sections, then the casting concrete on the crown beam section again, obtains concrete support section;
Step 5:Step 4 is repeated, the multistage crown beam section obtained is made successively one will to be connected at the top of all cast-in-situ bored piles (1) It rises, obtains top crown beam (3), so that the Multi-section concrete supporting section obtained is linked together and form top concrete support (4);
Step 6:Layer of ground soil within construction area is excavated using excavator, is divided mining process according to the length of construction area For multistage excavation, excavated paragraph by paragraph along construction area length direction, one section of Component units section foundation pit of every excavation, every segment unit Duan Ji Spacing or cast-in-situ bored pile (1) face with adjacent between any adjacent two interim central post (2) described in hole width and step 2 When central post (2) between spacing it is consistent;
Step 7:The mining process of every segment unit section foundation pit is divided into multilayer according to preset foundation pit excavating depth to excavate, according to Top-down direction is successively excavated, and one layer of Component units layer foundation pit of every excavation often excavates a layer unit layer foundation pit, if the list First layer foundation pit is located within standard regions (8), then set up within the elementary layer foundation pit connection cast-in-situ bored pile (1) with temporarily Steel pipe support between central post (2) or between the adjacent two interim central posts (2) of connection is as waist rail (6), if the elementary layer Foundation pit is located within node area (9), then sets up a concrete using the method for concreting within the elementary layer foundation pit Support is used as waist rail (6);
Step 8:Step 6 is repeated to step 7, so that all elementary section foundation pits excavated is interconnected becomes foundation pit;
Step 9:Correspond to node area (9) at the Foundation Pit bottom excavated and excavate the earthwork below, excavates egress in bottom of foundation ditch Pit (10) under area, then pit (10) two sides adjacent domain excavates work nest (11) respectively under node area;
Step 10:Concrete is filled to work nest described in step 9 (11) slot bottom, after filled concrete setting, forms bottom Plate (7), then all steel pipe supports and concrete support are removed.
2. foundation ditch construction method at a kind of subway station transfer according to claim 1, it is characterised in that:The subway Foundation ditch construction method at transfer of standing is further comprising the steps of:
It is carrying out between step 5 and step 6, using top concrete support (4) as support, in the top concrete It supports and sets up a steel suspension bridge (5) on (4).
3. foundation ditch construction method at a kind of subway station transfer according to claim 1, it is characterised in that:It is buried in step 2 Cast-in-situ bored pile (1) depth within node area (9) ground, which is greater than, to be embedded within the standard regions (8) ground Cast-in-situ bored pile (1) depth 2m~3m.
4. foundation ditch construction method at a kind of subway station transfer according to claim 1, it is characterised in that:It is buried in step 2 If when interim central post (2), if the interim central post (2) is located within standard regions (8), which uses lattice Structure column, if the interim central post (2) is located within node area (9), which uses concrete filled steel tubular column.
5. foundation ditch construction method at a kind of subway station transfer according to claim 1, it is characterised in that:Institute in step 6 State along the sequence that construction area length direction excavates elementary section foundation pit paragraph by paragraph be from the middle part of construction area to both sides symmetrically by Section is excavated.
6. foundation ditch construction method at a kind of subway station transfer according to claim 1, it is characterised in that:Institute in step 9 Stating pit (10) surrounding inner wall under node area is the slope surface relative to perpendicular at 30 °~45 ° inclination angles.
7. a kind of subway station transfer node section foundation ditch construction method according to claim 1, it is characterised in that:Step 8 Described in successively excavate elementary layer foundation pit during, further include to the elementary layer foundation pit surrounding inner wall excavated using Bolt net and jet Gib or Larsen steel sheet pile gib.
8. a kind of subway station transfer node section foundation ditch construction method according to claim 1, it is characterised in that:Step 8 Described in successively excavate elementary layer foundation pit during, further include using step roll-back method slope excavate, the step gradient be 1:1.
CN201810944500.9A 2018-08-19 2018-08-19 A kind of subway station transfer node section foundation ditch construction method Pending CN108842820A (en)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN109487798A (en) * 2018-12-29 2019-03-19 中交(广州)建设有限公司 Station asymmetry excavation supporting structure and construction technology
CN113153313A (en) * 2021-04-13 2021-07-23 中铁十四局集团有限公司 Punching method for communicating transfer hall
CN114197476A (en) * 2021-11-16 2022-03-18 中铁四局集团第四工程有限公司 Square support construction method for deep foundation pit of urban railway underground station transfer section
CN116607364A (en) * 2023-07-19 2023-08-18 华侨大学 Construction vehicle supporting platform arranged on upper part of foundation pit crown beam

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109487798A (en) * 2018-12-29 2019-03-19 中交(广州)建设有限公司 Station asymmetry excavation supporting structure and construction technology
CN109487798B (en) * 2018-12-29 2024-03-22 中交(广州)建设有限公司 Asymmetric excavation construction process for station
CN113153313A (en) * 2021-04-13 2021-07-23 中铁十四局集团有限公司 Punching method for communicating transfer hall
CN114197476A (en) * 2021-11-16 2022-03-18 中铁四局集团第四工程有限公司 Square support construction method for deep foundation pit of urban railway underground station transfer section
CN114197476B (en) * 2021-11-16 2024-01-23 中铁四局集团第四工程有限公司 Construction method for deep foundation pit-mouth-shaped support of transfer section of urban railway underground station
CN116607364A (en) * 2023-07-19 2023-08-18 华侨大学 Construction vehicle supporting platform arranged on upper part of foundation pit crown beam
CN116607364B (en) * 2023-07-19 2023-09-15 华侨大学 Construction vehicle supporting platform arranged on upper part of foundation pit crown beam

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Application publication date: 20181120