CN204899930U - Secretly dig leading dry out well in subway hole - Google Patents

Secretly dig leading dry out well in subway hole Download PDF

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Publication number
CN204899930U
CN204899930U CN201520491996.0U CN201520491996U CN204899930U CN 204899930 U CN204899930 U CN 204899930U CN 201520491996 U CN201520491996 U CN 201520491996U CN 204899930 U CN204899930 U CN 204899930U
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China
Prior art keywords
well
pilot tunnel
dry
floor
construction
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CN201520491996.0U
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Chinese (zh)
Inventor
郭永伟
武明静
张隽
王鹏程
张卫业
沈春盛
张勇
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Second Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd
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Second Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd
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Abstract

The utility model belongs to the technical field of the subway tunnel excavation, specifically a secretly dig leading dry out well in subway hole. The problem of sand cobble stratum tradition construction precipitation effect not good is solved, a secretly dig leading dry out well in subway hole, the upper pilot tunnel that finishes including being under construction and lower floor's pilot tunnel of treating the construction, the excavation has a plurality of dry out wells on the upper pilot tunnel, and the dry out well runs through in whole lower floor's pilot tunnel of treating the construction, and dry out well top is equipped with the dado, and the dado periphery is provided with the isolation layer, and dry out shaft bottom portion is equipped with the suction pump.

Description

Dewatering by leading level well in tunneling subway hole
Technical field
The utility model belongs to metro tunnel excavation technical field, specifically Dewatering by leading level well in a kind of tunneling subway hole.
Background technology
In recent years, along with the fast development of subway, process of construction is faced with day by day complicated underground environment.Adopt cut and cover method that large-area earth clearance and traffic must be brought to lead to change, and shield method can only be applied to standard section, is not suitable for section and changes more underground tunnel structure.Shallow burial hidden digging, have natural advantage, floor space is few, does not affect traffic above-ground, and digging mode is flexible, therefore, in subway construction under the new situation, obtains more application.
In excavation of subway process when passing through sand-pebble layer, needing in advance at ground construction dewatering well, by well point method water-pumping/draining, making water level drop to below the scope of operation, in the hope of reaching the condition of anhydrous excavation.But dewatering well (conventional caliber is 200mm) can only make water level reduce in subrange, water level can not be dropped to the height of expection.When especially running into interfacial water or perched water, dewatering well will be at a complete loss as to what to do.Therefore, when tunneling pilot tunnel is constructed, under upper strata pilot tunnel is in anhydrous condition, just can construct very soon; But when constructing the lower floor's pilot tunnel below groundwater table, due to main based on cobble, circle gravel, fine sand in stratum, permeability is strong, inevitably runs into underground water problem.Sometimes face or sidewall there will be larger stock current, run into layer of sand also with quicksand, and form significant threat to the safety of constructor, therefore digging process often plants seepage and suspend.Measure conventional is at present grouting for water blocking, after finding seepage point, it is injected to the cement-silicate dual slurry of rapid solidification, is stoped beyond excavation face by current.Although the method is effective in theory, in practical operation, many problems are there is, such as: current cause more greatly the slurries injected to be diluted by current, waste material and do not have due effect; Because of the uncertainty of formation void, fast solidifying slurries may inject dewatering well and cause the problems such as dewatering well inefficacy.
Summary of the invention
The utility model, in order to solve the not good problem of sand-pebble layer traditional construction dewatering effect, provides Dewatering by leading level well in a kind of tunneling subway hole.
The utility model takes following technical scheme: Dewatering by leading level well in a kind of tunneling subway hole, comprise the complete upper strata pilot tunnel of construction and lower floor's pilot tunnel to be onstructed, on the pilot tunnel of upper strata, excavation has some drainage wells, drainage well is through whole lower floor's pilot tunnel to be onstructed, drainage well top is provided with retaining wall, retaining wall periphery is provided with separation layer, and drainage bottom is provided with suction pump.
Described drainage well cross-distribution is on the pilot tunnel of upper strata.
Described drainage well stake footpath is 1 meter, and the degree of depth is 3-4 rice.
The base plate of the upper strata pilot tunnel of having constructed excavates artificial drainage well, efficiently collects the underground water within the scope of about 3 meters, periphery, reach the object of advance water discharge to the face of lower floor's pilot tunnel.Because drainage well location is before face, while excavation drainage well, serves again the effect of geologic prediction, provide reference to the personnel excavated, to select more efficiently, reasonable manner is excavated, and is kill two birds with one stone.
Compared with prior art, maximum two days of the utility model manually digging hole just can pore-forming, safe, convenient, fast, do not need big machinery and new high-tech material, the difficult problem that sand-pebble layer dewatering effect difference is brought can be overcome, excavation is carried out smoothly, ensure that the duration.Obtain larger duration benefit with few input, therefore, there is high promotional value.
Accompanying drawing explanation
Fig. 1 is the utility model profile;
Fig. 2 is the utility model plan view;
1-upper strata pilot tunnel in figure, 2-lower floor pilot tunnel, 3-drainage well.
Detailed description of the invention
In Practical Project is built.The Beijing Metro undertaken the construction of by middle Tie Shierju group No. 16 lines 17 mark east gate, Yuyuan Lake erect-position immediately below Xicheng District of Beijing and intersection Sanlihe Road, Haidian District, adopt PBA shallow mining method, this station is mainly positioned at alluvial-proluvial plain second-order terrace, be positioned at ancient stream channel, ancient Jin Gou river, the sandy gravel deposited containing a large amount of ancient stream channel in tunneling stratum and Extra-fine sand, permeability is strong.
No. 1, station, east gate, Yuyuan Lake ventilating shaft transverse passage-way levels pilot tunnel is all arranged in sand-pebble layer, and upper strata pilot tunnel is in anhydrous stratum and more stable, can normally excavate.When construct lower floor's pilot tunnel the 4th layer time, because excavation causes underground water to collect to the place of hollowing out, one deck interface current (dewatering well cannot carry out pump drainage to it) at the place of topping bar are topped bar along interface from third layer and are gushed out, and hydraulic pressure is comparatively greatly and with fine sand.Because excavation exists larger risk, cause construction to stop several times, progress is slow.The delayed of transverse passage-way progress will directly cause the main body duration delayed.
Dewatering by leading level well in a kind of tunneling subway hole, comprise the complete upper strata pilot tunnel 1 of construction and lower floor's pilot tunnel 2 to be onstructed, on upper strata pilot tunnel 1, excavation has some drainage wells 3, drainage well 3 is through whole lower floor's pilot tunnel 2 to be onstructed, drainage well 3 top is provided with retaining wall, retaining wall periphery is provided with separation layer, is provided with suction pump bottom drainage well 3.
Described drainage well 3 cross-distribution is on upper strata pilot tunnel 1.
Described drainage well 3 footpaths are 1 meter, and the degree of depth is 3-4 rice.
After drainage well construction completes, the water yield according to every mouthful of well arranges suction pump, ensures that the water flow energy collected is drained in time.After taking above measure, underground water have found passage more efficiently, and face is water burst no longer.The excavation of drainage well has verified again the geological condition of front of tunnel heading to a certain extent, for follow-up excavation provides true and reliable foundation.

Claims (3)

1. Dewatering by leading level well in a tunneling subway hole, it is characterized in that: comprise the complete upper strata pilot tunnel (1) of construction and lower floor's pilot tunnel (2) to be onstructed, lower floor's pilot tunnel (2) is positioned at the below of upper strata pilot tunnel (1), the upper excavation of upper strata pilot tunnel (1) has some drainage wells (3), drainage well (3) is through whole lower floor's pilot tunnel (2) to be onstructed, drainage well (3) top is provided with retaining wall, and retaining wall periphery is provided with separation layer, and drainage well (3) bottom is provided with suction pump.
2. Dewatering by leading level well in tunneling subway hole according to claim 1, is characterized in that: described drainage well (3) cross-distribution is on upper strata pilot tunnel (1).
3. Dewatering by leading level well in tunneling subway hole according to claim 2, is characterized in that: described drainage well (3) stake footpath is 1 meter, and the degree of depth is 3-4 rice.
CN201520491996.0U 2015-07-09 2015-07-09 Secretly dig leading dry out well in subway hole Active CN204899930U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520491996.0U CN204899930U (en) 2015-07-09 2015-07-09 Secretly dig leading dry out well in subway hole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520491996.0U CN204899930U (en) 2015-07-09 2015-07-09 Secretly dig leading dry out well in subway hole

Publications (1)

Publication Number Publication Date
CN204899930U true CN204899930U (en) 2015-12-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201520491996.0U Active CN204899930U (en) 2015-07-09 2015-07-09 Secretly dig leading dry out well in subway hole

Country Status (1)

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CN (1) CN204899930U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107227961A (en) * 2017-06-29 2017-10-03 中铁十二局集团有限公司 Heavy caliber dewatering well construction method in metro built by mining method hole
CN108661662A (en) * 2018-05-17 2018-10-16 中铁十二局集团有限公司 Water rich strata increases tunnel boring Cheng Jing newly and harnesses the river method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107227961A (en) * 2017-06-29 2017-10-03 中铁十二局集团有限公司 Heavy caliber dewatering well construction method in metro built by mining method hole
CN108661662A (en) * 2018-05-17 2018-10-16 中铁十二局集团有限公司 Water rich strata increases tunnel boring Cheng Jing newly and harnesses the river method

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