CN111794757A - Underground water treatment method for composite stratum subsurface excavation construction under existing building - Google Patents

Underground water treatment method for composite stratum subsurface excavation construction under existing building Download PDF

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Publication number
CN111794757A
CN111794757A CN202010744156.6A CN202010744156A CN111794757A CN 111794757 A CN111794757 A CN 111794757A CN 202010744156 A CN202010744156 A CN 202010744156A CN 111794757 A CN111794757 A CN 111794757A
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China
Prior art keywords
excavation
underground
line
treatment method
main tunnel
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Granted
Application number
CN202010744156.6A
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Chinese (zh)
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CN111794757B (en
Inventor
姚西平
张存
胡清茂
倪吉栋
张国良
王敦显
翟可
李龙
王怀东
梅展军
杨晓猛
李舸鹏
孙浩
徐小涛
赵国智
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xuzhou Urban Rail Transit Co ltd
China Railway Liuyuan Group Co Ltd
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Xuzhou Urban Rail Transit Co ltd
China Railway Liuyuan Group Co Ltd
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Priority to CN202010744156.6A priority Critical patent/CN111794757B/en
Publication of CN111794757A publication Critical patent/CN111794757A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/18Bulkheads or similar walls made solely of concrete in situ
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F16/00Drainage
    • E21F16/02Drainage of tunnels

Abstract

The invention discloses a groundwater treatment method for composite stratum subsurface excavation construction under an existing building, which comprises the following steps: a) finishing the main structure of the open cut hall; b) uniformly arranging 1 section drain pipe in four quadrants of the underground continuous wall pair CRD, and additionally arranging 1 section drain pipe in the center; c) sequentially chiseling off the underground continuous walls; d) constructing primary supports, temporary vertical braces and temporary transverse braces within the thickness range of the underground continuous wall, and spraying C25 early strength concrete to realize side frame spraying; e) digging a large pipe shed of the arch part of the main tunnel dug by a right line and a left line, and actively releasing a water bag of the soil-rock junction surface of the arch part; f) grouting the advanced large pipe shed, and uniformly diffusing slurry into a soil body through small holes in the wall of the large pipe shed; when the CRD is constructed by small holes, a small advanced conduit is arranged between the pipe sheds for grouting. The invention saves the construction cost, accelerates the progress of the project, saves the construction period and solves the problem of arranging the dewatering well.

Description

Underground water treatment method for composite stratum subsurface excavation construction under existing building
Technical Field
The invention relates to a groundwater treatment method for compound stratum subsurface excavation construction under an existing building, and belongs to the technical field of underground engineering.
Background
With the development of cities and the continuous gathering of population to big cities, the building space of the urban center is denser, the traffic of the main road is more busy, and higher requirements are put forward for the construction of future underground engineering. Such as the problems of huge removal cost, large coordination difficulty, poor feasibility and the like of the existing underground building.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a groundwater treatment method for compound stratum subsurface excavation construction under the existing building.
In order to achieve the aim, the invention adopts a groundwater treatment method for composite stratum subsurface excavation construction under an existing building, which comprises the following steps:
a) finishing the main structure of the open cut hall;
b) uniformly arranging 1 cross-section drainage pipe in four quadrants of the underground continuous wall pair CRD, and additionally arranging 1 cross-section drainage pipe in the center position to release the confined water in front of the underground continuous wall and the tunnel face in advance;
c) sequentially chiseling off the underground continuous walls;
d) constructing primary supports, temporary vertical braces and temporary transverse braces within the thickness range of the underground continuous wall, and spraying C25 early strength concrete to realize side frame spraying;
e) digging a large pipe shed of the arch part of the main tunnel dug by a right line and a left line, and actively releasing a water bag of the soil-rock junction surface of the arch part;
f) grouting the advanced large pipe shed, and uniformly diffusing slurry into a soil body through small holes in the wall of the large pipe shed; when the CRD is constructed by small holes, a small advanced conduit is arranged between the pipe sheds for grouting.
As an improvement, the composite stratum comprises an upper old city miscellaneous filling soil layer, a middle hard plastic clay layer and a lower strip-shaped limestone layer.
As an improvement, the right-line underground excavation main tunnel and the left-line underground excavation main tunnel are positioned under an existing underground building, and the left-line underground excavation main tunnel is connected with the main structure of the open excavation hall; the main structure of the right-line underground excavation main tunnel, the left-line underground excavation main tunnel and the open excavation hall is connected through an air duct and an underground excavation transverse channel to form a separation island station.
As an improvement, the arch tops of the right-line underground excavation main tunnel, the left-line underground excavation main tunnel and the air duct and underground excavation transverse channel are all positioned on the soil-rock junction surface.
The improvement is that the right-side underground excavation main tunnel and the left-side underground excavation main tunnel are constructed by adopting a CRD method and are composed of primary supports, temporary vertical supports and temporary transverse supports, and after four areas are excavated, two linings are poured in a partition and subsection mode.
As an improvement, the section water discharge pipe adopts a sharp-nose steel pipe with the diameter phi of 108 mm and the diameter t of 6mm, and the steel pipe is provided with a small hole with the diameter phi of 10mm in a quincunx shape throughout the whole circumference.
Compared with the prior art, the invention has the beneficial effects that:
1) the underground water treatment method avoids the removal of the existing buildings, alleviates the social contradiction, greatly saves the construction cost, accelerates the progress of the engineering and saves the construction period.
2) The underground water treatment method solves the problem that a precipitation well must be arranged on the ground or at the bottom of a tunnel in underground excavation engineering.
Drawings
FIG. 1 is a general plan view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
in the figure: 1. the method comprises the following steps of 1, building an existing underground building, 2, a right-line underground excavation main tunnel, 3, a left-line underground excavation main tunnel, 4, an air duct and underground excavation transverse channel, 5, an open excavation hall main body structure, 6, an underground continuous wall, 7, primary supports, 8, temporary vertical supports, 9, temporary transverse supports, 10, two linings, 11, a section drainage pipe, 12, a large pipe shed, 13, an advanced small pipe, 14, old city miscellaneous fill, 15, hard plastic clay and 16, strip-shaped limestone.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below. It should be understood, however, that the description herein of specific embodiments is only intended to illustrate the invention and not to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used herein in the specification of the present invention are for the purpose of describing particular embodiments only and are not intended to limit the present invention.
Example 1
The Xuzhou No. 1 line Pengcheng wide station is an open-underground excavation separation island type station, part of station platform layers are underground excavation separation island type stations which are positioned under the existing fashion road, and the CRD underground excavation method is adopted for construction. The fashion major path is a business with one underground layer and two local layers, the total building area is about 13000 square meters, and a plurality of shop property rights are owned by individuals; the fashionable big-road underground commercial street has the street crossing function of four quadrants of a crossroad of a Huaihai road and a Zhongshan road, is a Xuzhou city business center, has very large passenger flow and great difficulty in removal and coordination. If according to conventional design, both can't be in existing structure construction precipitation well, can't set up precipitation well again in CRD cross section, and the anhydrous operation of secretly digging can't realize.
In addition, the stratum is a composite stratum and comprises an upper old city miscellaneous filling soil 14, a middle hard plastic clay 15 and a lower strip-shaped limestone 16;
the thickness of the old city miscellaneous filling soil 14 on the upper layer is about 11m, and the old city miscellaneous filling soil contains diving water and is supplied by atmosphere and rainfall; the thickness of the hard plastic clay 15 in the middle layer is about 11m, the engineering mechanical property is good, the permeability coefficient is extremely small, and the hard plastic clay can be used as a waterproof layer; the buried depth of the strip-shaped limestone 16 is about 22m, karst caves and cracks exist in the limestone, high confined water exists in the basement limestone, and no hydraulic connection exists between the confined water of the basement rock and the upper layer diving water.
The specific construction method comprises the following steps:
a) finishing the main structure 5 of the open cut hall;
b) 1 cross-section drainage pipe 11 is uniformly drilled in four quadrants of the underground continuous wall 6 to CRD, 1 cross-section drainage pipe 11 is additionally arranged in the center position, and the confined water in front of the underground continuous wall 6 and the tunnel face is released in advance;
c) sequentially chiseling off the underground continuous walls 6;
d) constructing a primary support 7, a temporary vertical support 8 and a temporary transverse support 9 within the thickness range of the underground continuous wall 6, arranging a mortar anchor rod on the arch waist side, and spraying C25 early strength concrete to realize side frame spraying;
e) digging a large pipe shed 12 of the arch part of the main tunnel dug by a right line and a left line, and actively releasing a water bag of the soil-rock junction surface of the arch part;
f) grouting the advanced large pipe shed 12, wherein the grout is uniformly diffused into the soil body through small holes on the wall of the large pipe shed, and after the grout and the soil body between the pipe sheds are hardened, the grout not only has the functions of reinforcing the front soil body and the shed frame, but also has the effect of water insulation; when the CRD is constructed by small holes, a small advanced guide pipe 13 is arranged between the pipe sheds for grouting.
The right line underground excavation main tunnel 2 and the left line underground excavation main tunnel 3 are located under the existing underground building 1, and the left line underground excavation main tunnel 3 is connected with the main structure 5 of the open excavation hall; the right line underground excavation main tunnel 2 is connected with the left line underground excavation main tunnel 3 and the open excavation hall main body structure 5 through an air duct and underground excavation transverse channel 4 to form a separation island station, and the underground excavation tunnels are constructed by adopting a CRD method; the main structure of the open excavation hall is completed firstly, and then the construction of underground excavation is carried out.
The right-side underground excavation main tunnel 2 and the left-side underground excavation main tunnel 3 are constructed by adopting a CRD method and are composed of primary supports 7, temporary vertical supports 8 and temporary transverse supports 9, and after four areas are excavated, secondary linings 10 are poured in a partition and subsection mode.
After the construction of the air duct and transverse channel 4 is completed, 1 section drain pipe 11 is uniformly arranged in each quadrant of the main tunnel CRD, and the central position is additionally provided with 1 section drain pipe 11. The length of the cross section drain pipe 11 is the same as the distance between two adjacent air channels and the underground excavated transverse channel 4. The section water discharge pipe 11 adopts a sharp-nose steel pipe with the diameter phi 108 and the diameter t being 6mm, the steel pipe is communicated with a small hole with the diameter phi 10mm in a plum blossom shape in the whole circumference, and pressure water in front of the tunnel face flows to the water discharge pipe through the small hole to be discharged. Referred to as a "center row".
And the vault of the right-line underground excavation main tunnel 2, the left-line underground excavation main tunnel 3 and the air duct and transverse channel 4 are all positioned on a soil-rock joint surface, and water bags are often arranged at the vault. In order to avoid dangerous situations of CRD underground excavation construction, the large pipe shed 12 of the arch part is utilized to actively release water on the soil-rock junction surface, which is called as arch part release.
After the arch water sac is released, the advanced large pipe shed 12 is grouted, slurry is uniformly diffused into the soil body through small holes in the wall of the large pipe shed 12, and after the slurry and the soil body between the pipe sheds are hardened, the effect of water-proof arch is achieved besides the effect of reinforcing the front soil body and the shed frame. When constructing small pilot tunnels one by one, a small advance guide pipe 13 is arranged between the pipe sheds for grouting, so that the effect of pipe advance and strong grouting is achieved, and the effect is called as 'advance grouting'.
After the method is adopted, the removal of the fashionable avenue is avoided, the normal operation of the fashionable avenue is ensured, the underground excavation in a waterless environment is ensured, and the construction risk is greatly reduced. The social, economic and environmental protection effects are obvious.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (6)

1. A groundwater treatment method for composite stratum subsurface excavation construction under an existing building is characterized by comprising the following steps:
a) finishing the main structure (5) of the open cut hall;
b) 1 cross-section drainage pipe (11) is uniformly drilled in four quadrants of the CRD of the underground continuous wall (6), 1 cross-section drainage pipe (11) is additionally arranged in the center position, and confined water in front of the underground continuous wall (6) and the tunnel face is released in advance;
c) sequentially chiseling off the underground continuous walls (6);
d) constructing a primary support (7), a temporary vertical support (8) and a temporary transverse support (9) within the thickness range of the underground continuous wall (6), and spraying C25 early strength concrete to realize side-frame side spraying;
e) digging a large pipe shed (12) of the arch parts of the main tunnels (2 and 3) by digging a right line and a left line, and actively releasing a water bag of the soil-rock junction surface of the arch parts;
f) grouting the advanced large pipe shed (12), and uniformly diffusing slurry into a soil body through small holes in the wall of the large pipe shed; when the CRD is constructed by small holes, a small advanced conduit (13) is arranged between the pipe sheds for grouting.
2. A groundwater treatment method for composite ground excavation construction under an existing building according to claim 1, wherein the composite ground includes an upper old city miscellaneous fill (14), a middle hard plastic clay (15), and a lower strip-shaped limestone (16).
3. A groundwater treatment method for composite formation subsurface excavation construction under an existing building according to claim 1, wherein the right line subsurface excavation main tunnel (2) and the left line subsurface excavation main tunnel (3) are located right below the existing underground building (1), and the left line subsurface excavation main tunnel (3) is connected with the open excavation hall main body structure (5); the right-line underground excavation main tunnel (2) is connected with the left-line underground excavation main tunnel (3) and the open excavation hall main body structure (5) through an air duct and an underground excavation transverse channel (4) to form a separation island station.
4. A groundwater treatment method for composite formation subsurface excavation construction under an existing building according to claim 3, wherein the arches of the right-line subsurface excavation main tunnel (2), the left-line subsurface excavation main tunnel (3), the air duct and subsurface passage (4) are all located at the earth-rock junction surface.
5. A groundwater treatment method for underground excavation construction of a composite stratum under an existing building according to claim 1 or 3, wherein the right-line underground excavation main tunnel (2) and the left-line underground excavation main tunnel (3) are constructed by a CRD method and are composed of primary supports (7), temporary vertical supports (8) and temporary transverse supports (9), and after four areas are excavated, the secondary lining (10) is poured in sections.
6. A groundwater treatment method for composite ground layer excavation construction under an existing building according to claim 1, wherein the section drainage pipe (11) is a sharp-nose steel pipe with diameter phi 108 and t being 6mm, and the steel pipe passes through a small hole with a length of plum blossom shape phi 10mm all around.
CN202010744156.6A 2020-07-29 2020-07-29 Underground water treatment method for composite stratum subsurface excavation construction under existing building Active CN111794757B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113217097B (en) * 2021-05-19 2022-06-24 中国建筑第二工程局有限公司 Deep open type comprehensive dewatering method and water pumping device for subsurface tunnel in water-rich composite stratum

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CN109057817A (en) * 2018-08-02 2018-12-21 中铁隆工程集团有限公司 Suitable for folding the c-type service channel structure and construction method that fall Subway Tunnel up and down
CN210013697U (en) * 2019-05-21 2020-02-04 中铁十一局集团城市轨道工程有限公司 Construction structure of near-penetrating building of underground excavation section of subway station entrance and exit
CN111140237A (en) * 2020-01-08 2020-05-12 合肥市轨道交通集团有限公司 Underground excavation method for subway tunnel tunneling
CN210710364U (en) * 2019-09-20 2020-06-09 吴恢圳 Unhooking-proof lifting machinery lifting hook

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Publication number Priority date Publication date Assignee Title
CN101285385A (en) * 2008-05-29 2008-10-15 中交第二公路勘察设计研究院有限公司 Undermining method for three-dimensional pipe-roof
CN102654055A (en) * 2012-05-21 2012-09-05 乐贵平 Construction method for compound construction of large-scale underground space structure by holes, groove and piles
CN103508313A (en) * 2013-10-11 2014-01-15 无锡市新华起重工具有限公司 Anti-rotation lifting hook
CN106567717A (en) * 2015-10-10 2017-04-19 中铁隧道勘测设计院有限公司 Construction oblique channel structure utilizing subway exit and entrance and construction method
CN106567718A (en) * 2015-10-10 2017-04-19 中铁隧道勘测设计院有限公司 Construction method for composite stratum single-arch super long-span subway station through groove broaching and support substitution
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CN109057817A (en) * 2018-08-02 2018-12-21 中铁隆工程集团有限公司 Suitable for folding the c-type service channel structure and construction method that fall Subway Tunnel up and down
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113217097B (en) * 2021-05-19 2022-06-24 中国建筑第二工程局有限公司 Deep open type comprehensive dewatering method and water pumping device for subsurface tunnel in water-rich composite stratum

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