CN108797641A - A kind of structure and its construction method of Underground Subway Station construction period full station sealing - Google Patents

A kind of structure and its construction method of Underground Subway Station construction period full station sealing Download PDF

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Publication number
CN108797641A
CN108797641A CN201810805502.XA CN201810805502A CN108797641A CN 108797641 A CN108797641 A CN 108797641A CN 201810805502 A CN201810805502 A CN 201810805502A CN 108797641 A CN108797641 A CN 108797641A
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CN
China
Prior art keywords
water
station
construction
sealing
stake
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Pending
Application number
CN201810805502.XA
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Chinese (zh)
Inventor
张金伟
姜华龙
徐骞
营升
熊桂荣
王振
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China Railway 18th Bureau Group Co Ltd
Municipal Engineering Co Ltd of China Railway 18th Bureau Group Co Ltd
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China Railway 18th Bureau Group Co Ltd
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Publication date
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Priority to CN201810805502.XA priority Critical patent/CN108797641A/en
Publication of CN108797641A publication Critical patent/CN108797641A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/04Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
    • 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

Abstract

The invention discloses the structures and its construction method of a kind of full station sealing of Underground Subway Station construction period, the water sealing structure includes water sealing structure, bottom of foundation ditch water-stop curtain between fender post, fender post in Station, water sealing structure cooperatively forms excavation face side wall water sealing structure with fender post between the fender post, the bottom of foundation ditch water-stop curtain is to form water barrier by the bottom of foundation ditch soil body reinforce, and buffer layer is arranged between water barrier and station bottom plate and does not reinforce.The excavation face side wall water sealing structure is combined to form babinet with substrate water-stop curtain, and isolation underground water, which enters, to be excavated in range.The water-stopping method that interlocking pile and jet grouting pile construction are combined is solved the problems, such as Underground Subway Station construction period full station sealing by the present invention in Station construction period, under the premise that security is guaranteed, avoid the waste of groundwater resources in subway dewatering engineering work progress, energy conservation and environmental protection.

Description

A kind of structure and its construction method of Underground Subway Station construction period full station sealing
【Technical field】:
The invention belongs to underground structure field more particularly to a kind of knots of full station sealing of Underground Subway Station construction period Structure and its construction method.
【Background technology】:
Station is constructed, and general precipitation is leading, but to reinforce the management and protection of groundwater in Beijing resource, reduces water The waste of resource prevents related geological disaster, and Construction Commission of Beijing, Bureau of Water Resources of Beijing printed and distributed in 2007《Beijing Engineering construction precipitation management method》, it then follows protection is preferential, rationally extracts, principle that is paid, comprehensively utilizing of drawing water, to building If the supervision and management of engineering construction precipitation.It saves and recycles comprehensively to be pushed further into resource, promotion forms Green Development Mode and life style, the Ministry of Finance, the State Tax Administration, Ministry of Water Resources were in joint publication in 2017《Expand water resource tax reform Pilot implementing method》, groundwater overdraft is strictly controlled, subsequent Beijing has also accordingly issued implementing method, specified north Capital city drainage drop row's underground water amount of tax to be paid is 4.3 yuan/side.Expense of the subway construction as will be still generated great number using dewatering construction, Under policy and the main trend of fwaater resources protection, the Groundwater Control scheme of subway construction need to more use sealing scheme.
Currently, general water-stopping method has ejection for water plugging curtain, freezing process and Structure Method.Freezing process is technically applied to It is practicable that sealing field is excavated in Large Underground space, but its cost is too high;Ejection for water plugging curtain generally uses deep hole to note Slurry and high-pressure rotary jet grouting pile, deep hole grouting are difficult to ensure in rich water pebble layer effect;Structure Method generally use diaphram wall and Interlocking pile, but Station limited space, diaphram wall are difficult to carry out.
Therefore, it is desirable to there is a kind of construction method of Underground Subway Station construction period full station sealing, tunneling can be suitable for Station and the water sealing structure and its construction method that can be constructed in construction period.
【Invention content】:
The object of the present invention is to provide the structures and its construction party of a kind of full station sealing of Underground Subway Station construction period Method solves the above problem of the existing technology.
To achieve the above object, the present invention provides a kind of structure of Underground Subway Station construction period full station sealing, packet Include in Station water sealing structure, bottom of foundation ditch water-stop curtain between fender post, fender post, between the fender post water sealing structure with enclose Fender pile cooperatively forms excavation face side wall water sealing structure, the bottom of foundation ditch water-stop curtain be by the bottom of foundation ditch soil body into Row is reinforced and forms water barrier, and buffer layer is arranged between water barrier and station bottom plate and does not reinforce.The excavation face side wall water sealing structure It is combined to form babinet with substrate water-stop curtain, isolation underground water, which enters, to be excavated in range.
Preferably, water sealing structure is to increase plain concrete pile between fender post AT STATION between the fender post, plain stake with enclose Occlusion is formed between fender pile, occlusion thickness is 300~350mm, and plain stake stake diameter and stake spacing are identical as fender post, and stake is long is longer than foundation pit Bottom 2~3m of water barrier lower sideline.
Preferably, it is 5~6m that the bottom of foundation ditch, which reinforces the impermeable layer thickness to be formed, and water barrier upper sideline is away from station pit 4~5m of bottom is not reinforced as buffer layer.
Preferably, the bottom of foundation ditch, which is reinforced, is arranged rotary churning pile in the water barrier to be formed, blossom type arrangement, stake diameter 1500mm, stake spacing 1300mm, array pitch 1100mm overlap 200mm between stake.
The present invention also provides a kind of construction methods of full station sealing of Underground Subway Station construction period, which is characterized in that Include the following steps:
(1) tunneling metro station construction carries out side wall water sealing structure construction to fender post node, i.e. AB types interlocking pile is applied Work, A type element stakes of first constructing, then Type B reinforced concrete pile of constructing, using mechanical hole building, until whole pile driving constructions are completed.
(2) continue construct station stake top Guan Liang, installation steel pipe column system and construction top beam structure, and reserved main arch two The splice of lining is laid with waterproof layer, backfills the space in top beam, excavate the main arch soil body, performs just branch button arch, paragraph by paragraph dismounting Pilot tunnel abutment wall, is laid with waterproof layer, and formwork erection pours two lining buttons arch;On earth excavation to phreatic line at 1~2m, ensure 4~5m Construction height carries out the water-stop curtain construction of bottom of foundation ditch.
(3) super-spun jet stake back cover is constructed:Pilot hole is carried out to water barrier bottom using all casing drill, is subsequently mounted injection Grouting Pipe to bottom hole carries out jet groutinl, and jet groutinl parameter cement mortar pressure reaches 28~32MPa, and cement mortar slurry flow reaches To 350L/min, air pressure reaches 0.7~1MPa, and air mass flow reaches 5.5m3/ min, you can with spray with turn with promotion, carry 10~15min/m of lifting speed, 8~10r/min of rotary speed, cement mixing content are not less than 35%.
(4) churning back cover is completed, and is set drainage well by the water pump drainage in station pit before earth excavation while being detected sealing Effect:Drainage well is set before earth excavation, SEA LEVEL VARIATION in drainage well is observed by pump drainage water, if unchanged, shows that sealing is imitated Fruit is up to standard.
(5) in digging process record pile body be engaged situation, anticipation side wall leakage water spot set in advance rotary churning pile or slip casting into Row reinforcement, it is ensured that excavated again after safety;
(6) earth excavation, station remaining structure of constructing;After the completion of sealing operation, plate, side wall, bottom girder in station are carried out And the construction of floor structure, if occur seepage point in digging process carries out slip casting closure processing in time.
Preferably, in the step (1), in the step (1), pile driving construction, " jump a dozen one " construction A are engaged for AB types Stake, constructs B again after the completion, and construction process is A1 → A2 →... ... → An → B1 → B2 →... ... → Bn.In Type B stake pore-forming Afterwards, 2 Grouting Pipes are set in hole, are located on the outside of structure, adjacent studs point of intersection, side slip casting is carried out to water-bearing interval.
Preferably, in the step (1), for plain stake, material compression strength is 5~8Mpa, convenient for subsequent construction Reinforced concrete pile Drilling is cut, and can ensure occlusion thickness, has anti-permeability performance, ensures water-stagnating effect.
Preferably, in the step (3), for super-spun jet stake, common rotary churning pile is compared, expanded diameter is in stratum N Sandy soil that value is 50~100 can reach 1.5~2m in cohesive soil, and cement mortar slurry flow reaches 350L/min.
The present invention provides the structures and its construction method of a kind of full station sealing of Underground Subway Station construction period, can The water sealing structure and its construction method that can be constructed suitable for Station and in construction period.
【Description of the drawings】:
Fig. 1 is Underground Subway Station water sealing structure construction schematic diagram in one embodiment.
Fig. 2 is that Underground Subway Station is engaged pile driving construction floor map in one embodiment.
Fig. 3 is Underground Subway Station bottom rotary jet pile driving construction floor map in one embodiment.
In figure:
1, station main hole 2, side wall interlocking pile
3, center pillar 4, Guan Liang
5, top beam 6, first branch button arch
7, two lining button arches 8, side wall construction joint
9, rotary churning pile working face 10, phreatic line
11, station bottom plate 12, substrate churning water barrier
13, buffer layer 14, rotary churning pile
15, A types element stake 16, Type B reinforced concrete pile
17, Grouting Pipe
【Specific implementation mode】:
To keep the purpose, technical scheme and advantage that the present invention is implemented clearer, with reference in the embodiment of the present invention Attached drawing, technical solution in the embodiment of the present invention are further described in more detail.
In a broad embodiment of the invention, a kind of construction method of Underground Subway Station construction period full station sealing, The water-stopping method is the sealing interlocking pile and super-spun jet stake R. concomitans to Station in Station construction period In construction, excavation face side wall interlocking pile and substrate rotary churning pile cooperatively form babinet, and isolation underground water, which enters, to be excavated in range.
As shown in Figs. 1-3, the structure of Underground Subway Station construction period full station sealing includes:Side wall interlocking pile 2, substrate Churning water barrier 12 and buffer layer 13, the side wall interlocking pile increase by one between the fender post stake of side wall diameter 800mm AT STATION The plain concrete pile of a same diameter, every two piles occlusion thickness 300mm, shape closely knit stake in a row prevent underground water from side wall It pours in and excavates region, plain stake stake is longer than bottom of foundation ditch water barrier lower sideline 3m;The substrate churning water barrier is in conjunction with foundation pit The clay and thin silt of bottom carry out reinforcing to station bottom soil body using churning form and form water barrier, prevent underground Water is poured in from station bottom in foundation pit, rotary churning pile diameter 1500mm, stake spacing 1300mm, and array pitch 1100mm is overlapped between stake 200mm, reinforcing impermeable layer thickness are 5m, have between water barrier upper sideline and station pit bottom the boulder bed of 5m as buffer layer not It is reinforced, convenient for live pump drainage water and earth excavation construction.
This embodiment of the present invention also provides a kind of construction method of the full station sealing of Station construction period construction, packet Include following steps:
(1) tunneling metro station construction carries out side wall water sealing structure construction to fender post node:It is used in the present embodiment PBA engineering methods are constructed, and after the completion of main hole excavates, are carried out AB types and are engaged pile driving construction, A type element stakes of first constructing, then Type B reinforcing bar of constructing Concrete-pile, using mechanical hole building, until whole pile driving constructions are completed." jump a dozen one " construction A, constructs B again after the completion, Construction process is A1 → A2 →... ... → An → B1 → B2 →... ... → Bn.A type element pile material compression strength is 5~8Mpa, just It is cut in the Type B reinforced concrete pile Drilling of subsequent construction, can ensure occlusion thickness, there is anti-permeability performance, ensure sealing effect Fruit.After Type B stake pore-forming, 2 Grouting Pipes are set in hole, are located on the outside of structure, adjacent studs point of intersection, water-bearing interval is carried out Side slip casting.Grouting Pipe uses the welded tube of DN32, screwed connection to be fixed on steel reinforcement cage, transferred section by section to hole with steel reinforcement cage Bottom, the above 5m of tube bottom are arranged 3 injected holes, at injected hole and side slip casting bottom of the tube need to wrap up it is closely knit, to prevent in filling process Concrete enters in Grouting Pipe.In addition, the center pillar system at station of constructing simultaneously, pile foundation, installation steel pipe are applied using mechanical hole building Column pours concrete.
(2) continue construct station stake top Guan Liang, installation steel pipe column system and construction top beam structure, and reserved main arch two The splice of lining is laid with waterproof layer, backfills the space in top beam, excavate the main arch soil body, performs just branch button arch, paragraph by paragraph dismounting Pilot tunnel abutment wall, is laid with waterproof layer, and formwork erection pours two lining buttons arch;On earth excavation to phreatic line at 1m, middle plate and side wall knot Structure wouldn't construct, and reserve side wall construction joint, ensure 4~5m construction heights, carry out the water-stop curtain construction of bottom of foundation ditch.
(3) super-spun jet stake back cover is constructed:Pilot hole is carried out to water barrier bottom using all casing drill, is subsequently mounted injection Grouting Pipe to bottom hole carries out jet groutinl, and jet groutinl relevant parameter cement mortar pressure reaches 28~32MPa, cement mortar slurry stream Amount reaches 350L/min, and air pressure reaches 0.7~1MPa, and air mass flow reaches 5.5m3/ min, you can with spray with turning with carrying It rises, promotes 10~15min/m of speed, 8~10r/min of rotary speed, cement mixing content is not less than 35%.
(4) churning back cover is completed, and is set drainage well by the water pump drainage in station pit before earth excavation while being detected sealing Effect:Drainage well is set before earth excavation, observing water level in drainage well by pump drainage water does not change, and shows that water-stagnating effect reaches Mark.
(5) in digging process record pile body be engaged situation, anticipation side wall leakage water spot set in advance rotary churning pile or slip casting into Row reinforcement, it is ensured that side wall does not occur bright water.
(6) earth excavation, station remaining structure of constructing;After the completion of sealing operation, plate, side wall, bottom girder in station are carried out And the construction of floor structure, if occur seepage point in digging process carries out slip casting closure processing in time.
The invention has the advantages that:
(1) excessive waste of groundwater resources caused by avoiding dewatering construction, the electricity saved water resource tax and used Take, be also responsive to government's precipitation policy, goodwill and social benefit are notable.
(2) the problem of stratum settlement caused by avoiding dewatering construction is big and surrounding buildings settlement deforms, indirect Management cost is saved.
(3) Underground Subway Station construction period full station sealing, side wall interlocking pile sealing and substrate churning are solved the problems, such as Water-stop curtain, which is combined, efficiently solves the problems, such as that Station working space is limited, under the premise that security is guaranteed, Neng Goushun Profit carries out construction, it is ensured that construction period and reduction security risk, indirect have saved management cost.
The above is merely illustrative of the technical solution of the present invention, rather than its limitations, for those skilled in the art For, the invention may be variously modified and varied.Any modification made by all within the spirits and principles of the present invention, etc. With replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (8)

1. a kind of structure of Underground Subway Station construction period full station sealing, which is characterized in that including being gone along with sb. to guard him in Station Stake, water sealing structure, bottom of foundation ditch water-stop curtain between fender post, water sealing structure is cooperatively formed with fender post between the fender post Excavation face side wall water sealing structure, the bottom of foundation ditch water-stop curtain are to form water proof by the bottom of foundation ditch soil body reinforce Layer is arranged buffer layer and does not reinforce between water barrier and station bottom plate;The excavation face side wall water sealing structure and substrate water-stop curtain It is combined to form babinet, isolation underground water, which enters, to be excavated in range.
2. the structure of Underground Subway Station construction period full station sealing according to claim 1, which is characterized in that described Water sealing structure increases plain concrete pile between fender post AT STATION between fender post, and plain stake is engaged with formation between fender post, is engaged Thickness be 300~350mm, plain stake stake diameter and stake spacing are identical as fender post, stake be longer than bottom of foundation ditch water barrier lower sideline 2~ 3m。
3. the structure of Underground Subway Station construction period full station sealing according to claim 1, which is characterized in that described Bottom of foundation ditch reinforce the impermeable layer thickness to be formed be 5~6m, water barrier upper sideline away from 4~5m of station pit bottom as buffer layer not It reinforces.
4. the water sealing structure at Underground Subway Station construction period full station according to claim 1, which is characterized in that described Bottom of foundation ditch, which is reinforced, is arranged rotary churning pile in the water barrier to be formed, arranged in blossom type, stake diameter 1500mm, stake spacing 1300mm, row Away from for 1100mm, 200mm is overlapped between stake.
5. the construction method of water sealing structure as described in claim 1-4 any one, which is characterized in that include the following steps:
(1) tunneling metro station construction carries out side wall water sealing structure construction to fender post node, i.e. AB types are engaged pile driving construction, first Construction A type element stakes, then Type B reinforced concrete pile of constructing, using mechanical hole building, until whole pile driving constructions are completed;
(2) continue construct station stake top Guan Liang, installation steel pipe column system and construction top beam structure, and reserve what main arch two served as a contrast Splice is laid with waterproof layer, backfills the space in top beam, excavate the main arch soil body, performs just branch button arch, remove pilot tunnel paragraph by paragraph Abutment wall, is laid with waterproof layer, and formwork erection pours two lining buttons arch;On earth excavation to phreatic line at 1~2m, ensure 4~5m constructions Highly, the water-stop curtain construction of bottom of foundation ditch is carried out;
(3) super-spun jet stake back cover is constructed:Pilot hole is carried out to water barrier bottom using all casing drill, is subsequently mounted jet groutinl Pipe to bottom hole carries out jet groutinl, and jet groutinl parameter cement mortar pressure reaches 28~32MPa, and cement mortar slurry flow reaches 350L/min, air pressure reach 0.7~1MPa, and air mass flow reaches 5.5m3/ min, you can with spray with turning with promotion, to be promoted 10~15min/m of speed, 8~10r/min of rotary speed, cement mixing content are not less than 35%;
(4) churning back cover is completed, and is set drainage well by the water pump drainage in station pit before earth excavation while being detected water-stagnating effect, SEA LEVEL VARIATION in drainage well, which is observed, by pump drainage water shows that water-stagnating effect is up to standard if unchanged;
(5) pile body is recorded in digging process and is engaged situation, and anticipation side wall leakage water spot sets rotary churning pile in advance or slip casting is mended By force, it is ensured that side wall does not occur bright water;
(6) earth excavation, station remaining structure of constructing;After the completion of sealing operation, plate, side wall, bottom girder and bottom in station are carried out The construction of harden structure, if occur seepage point in digging process carries out slip casting closure processing in time.
6. construction method according to claim 5, which is characterized in that in the step (1), AB type interlocking piles are applied Work, " jump a dozen one " construction A, constructs B again after the completion, and construction process is A1 → A2 →... ... → An → B1 → B2 →……→Bn.After Type B stake pore-forming, 2 Grouting Pipes are set in hole, are located on the outside of structure, adjacent studs point of intersection, to aqueous Interval carries out after-teeming slurry.
7. construction method according to claim 5, which is characterized in that in the step (1), for plain stake, material is anti- Compressive Strength is 5~8Mpa.
8. construction method according to claim 5, which is characterized in that in the step (3), for super-spun jet stake, phase Than common rotary churning pile, sandy soil that expanded diameter is 50~100 in stratum N values can reach 1.5~2m, water in cohesive soil Mud slurry flow reaches 350L/min.
CN201810805502.XA 2018-07-20 2018-07-20 A kind of structure and its construction method of Underground Subway Station construction period full station sealing Pending CN108797641A (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110241810A (en) * 2019-06-24 2019-09-17 腾达建设集团股份有限公司 A kind of annular attachment device being connect for a full set of Cased Secant Piles with structure base slab reinforcing bar
CN110374643A (en) * 2019-08-22 2019-10-25 中水电四局武汉轨道交通工程有限公司 A kind for the treatment of water leakage method at Underground Subway Station arch structure dovetail

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110241810A (en) * 2019-06-24 2019-09-17 腾达建设集团股份有限公司 A kind of annular attachment device being connect for a full set of Cased Secant Piles with structure base slab reinforcing bar
CN110241810B (en) * 2019-06-24 2020-12-01 腾达建设集团股份有限公司 Annular connecting device for connecting full-casing drilling secant pile and structural bottom plate steel bar
CN110374643A (en) * 2019-08-22 2019-10-25 中水电四局武汉轨道交通工程有限公司 A kind for the treatment of water leakage method at Underground Subway Station arch structure dovetail

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Inventor after: Jiang Hualong

Inventor after: Zhang Jinwei

Inventor after: Xu Jian

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Inventor after: Xiong Guirong

Inventor after: Wang Zhen

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