CN111101532A - Method for treating subway station base underground water in water-rich red sandstone stratum - Google Patents
Method for treating subway station base underground water in water-rich red sandstone stratum Download PDFInfo
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- CN111101532A CN111101532A CN202010025690.1A CN202010025690A CN111101532A CN 111101532 A CN111101532 A CN 111101532A CN 202010025690 A CN202010025690 A CN 202010025690A CN 111101532 A CN111101532 A CN 111101532A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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Abstract
The invention relates to a treatment method of subway station base groundwater in a water-rich red sandstone stratum, wherein a building enclosure is constructed in a station foundation pit of the red sandstone stratum; excavating foundation pits layer by layer in steps, and constructing a water collecting well when water seepage occurs in the base red sandstone layer; along with excavation of the foundation pit, in order to prevent underground water from flowing into the lower foundation pit, a water interception dam is arranged; when the foundation pit is excavated to the upper part of the foundation pit bottom plate by 1 meter, the underground water at the bottom of the foundation pit is reduced by utilizing the vacuum light well point dewatering structure, the disturbance to an undisturbed stratum is avoided, and the bearing capacity of a station base is increased; excavating the residual soil body of the foundation pit, pouring a thickened station base cushion layer, pouring a station bottom plate, reserving a water dropping hole in the station bottom plate, and abandoning the vacuum light well point water dropping structure and plugging the bottom plate after the station structure is sealed. The invention adopts the precipitation treatment method which is specially designed for step division and regional division, ensures that each step region in the foundation pit is in a waterless state, can ensure the bearing capacity of the base pit bottom of the station, and can ensure the later operation safety of the subway station.
Description
Technical Field
The invention relates to the technical field of station and underground engineering foundation pit construction, in particular to a treatment method of subway station base underground water in a water-rich red sandstone stratum.
Background
The red sandstone is also called as third-line siltstone, is a special unfavorable geology, has poor stratigraphic diagenesis and severe geological conditions, is exposed to water after excavation, has sharply reduced strength, softened rheology and sand flowing shape, and is not beneficial to the construction of subway stations. Excessive accumulated water in the station foundation pit causes severe softening of the red sandstone, the bearing capacity is reduced, and the construction process and the operation safety of the subway station in the later period are seriously influenced. Because the stratum is compact and high in strength when not disturbed, the control effect of the conventional dewatering method and the grouting water stopping reinforcement method is poor. The general mode such as triaxial stirring stake or high pressure jet grouting stake of ground adoption is adopted to conventional rich water station basement generally to carry out stagnant water treatment to the foundation ditch, and ground construction cost is high, and the stagnant water reinforcement effect is poor, hardly realizes ground water control, easily produces hidden danger such as percolating water after the end is seen in the foundation ditch excavation, influences the safety and the normal use of foundation ditch station structure.
The water-rich red sandstone stratum has the engineering characteristics of easiness in disintegration, high water absorption, low bonding and easiness in softening, and the conventional precipitation and grouting water-stopping reinforcement method is not easy to control.
Disclosure of Invention
The invention aims to provide a treatment method of underground water of a subway station base in a water-rich red sandstone stratum, which solves the technical problems of difficult precipitation, poor grouting and water stopping reinforcement effect and incapability of ensuring the bearing capacity of a structural base in the underground water treatment method in the existing excavation process of the water-rich red sandstone stratum.
The technical scheme adopted by the invention is as follows:
the treatment method of the subway station base groundwater in the water-rich red sandstone stratum is characterized by comprising the following steps of:
the method is realized by the following steps:
the method comprises the following steps: constructing a lateral water-stopping enclosure structure in a station foundation pit of the red sandstone stratum;
step two: excavating foundation pits layer by layer in steps, and constructing a water collecting well in the foundation pit when water seepage occurs in the foundation red sandstone layer;
step three: along with excavation of the foundation pit, in order to prevent underground water from flowing into the lower foundation pit, a water interception dam is arranged;
step four: when the foundation pit is excavated to the upper part of the foundation pit bottom plate by 1 meter, the underground water at the bottom of the foundation pit is reduced by utilizing the vacuum light well point dewatering structure, the disturbance to an undisturbed stratum is avoided, and the bearing capacity of a station base is increased;
step five: excavating the residual soil body of the foundation pit, pouring a thickened station base cushion layer, pouring a station bottom plate, reserving a water dropping hole in the station bottom plate, and abandoning the vacuum light well point water dropping structure and plugging the bottom plate after the station structure is sealed.
In the first step, the enclosure structure is an underground continuous wall or an enclosure pile.
And in the second step, the water collecting well comprises a vertical cylindrical densely-arranged steel reinforcement cage, 3 outer side reinforcing stirrups are arranged around the densely-arranged steel reinforcement cage, 1 transverse 3 vertical inner side reinforcing stirrups are arranged on the top surface and the bottom surface, and rice straws are wrapped outside the densely-arranged steel reinforcement cage.
In the third step, the water interception dam is formed by combining a bamboo curtain and a sandbag.
In the fourth step, the vacuum light well point dewatering structure comprises light well point perforated pipes which are vertically arranged in a row, and gauze is wrapped outside the light well point perforated pipes; each light well point perforated pipe is transversely connected through a water collecting pipe and is connected into a vacuum pump through a pump connecting rubber hose, and precipitation is carried out through the vacuum pump.
In the fourth step, the light well points perforated pipe plane is arranged in a row at intervals of 3 meters in the width direction of the station foundation pit, the points are distributed in a shape like a Chinese character 'yi', the longitudinal distance of each well point is 1 meter, every 6 well points are connected into a group by a water collecting pipe, and a vacuum pump is arranged at every two groups of well points.
In the fifth step, the bottom plate plugging structure comprises a pre-buried bottom plate passing sleeve, and a filter pipe and a sedimentation pipe which are arranged up and down are arranged in the bottom plate passing sleeve;
after a vacuum light well point dewatering structure is eliminated, concrete is filled in the lower part of the inner part of the bottom plate sleeve, a steel covering plate and a rubber sealing ring plate are adopted to lock the top of the sleeve, and waterproof mortar is used for filling the upper part of the bottom plate.
And a water stop flange plate, a slow expansion type water swelling water stop strip and a butyl rubber sealing adhesive tape are arranged on the periphery of the outer ring of the sleeve passing through the bottom plate.
The invention has the following advantages:
1. the invention provides a special dewatering treatment method for a foundation pit bottom in a water-rich red sandstone stratum, which comprises a specially designed vacuum light well point dewatering structure, a water collecting well and a sand bag water interception dam, ensures safe and rapid construction of the foundation pit of a station, and realizes real foundation pit bottom waterless operation.
2. The foundation pit is layered and partitioned by a foundation pit base combined treatment method of light well point dewatering, a water collecting well and a sandbag cut-off dam, the working procedures in the implementation process are less in interference, and the foundation pit is rapid and convenient to implement.
3. Only need adopt special design well point precipitation bottom the foundation ditch, guarantee that the foundation ditch is in anhydrous and the station bottom plate stratum is in the original state, guarantee later stage station structure basement bearing capacity.
4. The soil layer at the upper part of the foundation pit adopts a special water collecting well precipitation method and a bamboo-curtain sandbag cut-off dam underground water treatment method, and the method is easy to implement, practical, economic and rapid.
Drawings
FIG. 1 is a diagram of a foundation pit precipitation design step method according to the invention.
Fig. 2 is a design diagram of the foundation pit dewatering water collecting well.
FIG. 3 is a vacuum light well point precipitation profile design of the present invention.
FIG. 4 is a plan view of a vacuum light well point precipitation plan according to the present invention.
Fig. 5 is a diagram of a bottom plate plugging method according to the present invention.
In the figure, 1-a building enclosure, 2-an underground diaphragm wall or a fender post, 3-a red sandstone stratum, 4-an excavated soil layer, 5-a red sandstone protective layer, 6-a base stratum, 7-a vacuum light well point dewatering structure, 8-a water collecting well, 9-a water interception dam, 10-a sand bag, 11-a bamboo curtain, 12-a vacuum pump, 13-a light well point floral tube, 14-a water collecting tube, 15-a pump connection rubber hose, 16-an outer wrapping gauze, 17-a close-packed steel reinforcement cage, 18-a straw, 19-an outer reinforcing stirrup, 20-an inner reinforcing stirrup, 21-a station base cushion layer, 22-a station bottom plate, 23-a station bottom plate plug, 24-a steel plate, 25-a rubber sealing ring plate, 26-waterproof mortar and 27-a water stop flange plate, 28-through bottom plate sleeve, 29-slow expansion type water swelling stop bar, 30-butyl rubber sealant adhesive tape, 31-filling concrete, 32-filter tube and 33-sedimentation tube.
Detailed Description
The present invention will be described in detail with reference to specific embodiments.
The invention provides a special precipitation treatment technology and a construction method for a foundation pit bottom of a station in a water-rich red sandstone stratum, which aim to solve the technical problems of difficult precipitation, poor grouting water-stop reinforcement effect and incapability of ensuring the bearing capacity of a structural foundation in the underground water treatment method of the foundation pit in the water-rich red sandstone stratum excavation process. Aiming at foundation pits with different excavation depths of a station, the underground water of an upper foundation pit is reduced by utilizing the special design of the reinforcement cage dewatering well matched with the straws, the underground water is prevented from flowing into a lower foundation pit by utilizing the combined mode of the bamboo curtain matched with the sand bag, the underground water at the bottom of the foundation pit is reduced by utilizing the vacuum well point dewatering arrangement and the structure of the special design, the disturbance to an original stratum is avoided, and the bearing capacity of the station foundation pit is increased.
The invention particularly relates to a method for treating subway station base groundwater in a water-rich red sandstone stratum, which is realized by the following steps:
the method comprises the following steps: constructing a lateral water-stopping enclosure structure 1 in a station foundation pit of the red sandstone stratum 3 to ensure lateral water stopping of the foundation pit;
step two: excavating foundation pits layer by step, carrying out well point dewatering on a foundation pit soil layer of a station base plate base by adopting a vacuum light well point dewatering structure 7, and treating an area of an excavation area in the later stage of an upper step in the foundation pit by adopting a water collecting well 8 and a water interception dam 9; when the foundation red sandstone layer is exposed, constructing a water collecting well 8 in the foundation pit;
step three: along with the excavation of the foundation pit, as seepage can be converged into a river in the stratum, a water interception dam 9 is arranged for preventing underground water from flowing into the lower foundation pit;
step four: continuing excavation, namely, enabling the foundation pit to be at the bottom, and when the foundation pit is excavated to the upper part of the bottom plate of the foundation pit by 1 meter, reducing underground water at the bottom of the foundation pit and avoiding disturbance to an original-state stratum by using the vacuum light well point dewatering structure 7 so as to ensure the bearing capacity of the base of the station and reduce disturbance to the original-state stratum of the base;
step five: excavating the residual soil body of the foundation pit, pouring a thickened station base cushion layer 21, pouring a station bottom plate 22, reserving a water-dropping hole on the station bottom plate 22, and abandoning the vacuum light well point water-dropping structure 7 and plugging a bottom plate 23 after the station structure is closed. Before the bottom plate is poured, light well spot perforated pipes are integrated into a bundle, a water descending hole is formed in the bottom plate, two holes are formed in each 20 m longitudinal direction of a station and are located in the positions 1/3 and 2/3 in the width direction respectively.
In the first step:
the enclosure structure 1 is an underground continuous wall or an enclosure pile 2.
In the second step:
the water collecting well 8 comprises a vertical cylindrical densely-arranged steel reinforcement cage 17, 3 phi 20 outer side reinforcing stirrups 19 are arranged on the periphery of the densely-arranged steel reinforcement cage 17, 1 transverse 3 vertical phi 20 inner side reinforcing stirrups 17 are arranged on the top surface and the bottom surface, and rice straws 18 wrap the densely-arranged steel reinforcement cage 17. The densely arranged reinforcement cage 17 is 2 m high, 1.5 m in diameter, adopts phi 20 reinforcement vertically, and is densely arranged.
And 2 water collecting wells 8 are arranged beside the side wall of the foundation pit, the longitudinal length of the excavation is 20 m, and the excavation gradient is greater than 2%.
In the third step:
the cutoff dam 9 is formed by combining a bamboo curtain 11 and a sand bag 10. The bamboo curtain 11 is 1 meter long, wherein 0.5 meter is inserted into the red sand rock soil layer.
And a water interception dam 9 is arranged at 20 m in the longitudinal excavation direction to prevent water on the surface of the foundation pit from flowing into the lower excavated foundation pit.
In the fourth step:
the vacuum light well point dewatering structure 7 comprises light well point perforated pipes 13 which are vertically arranged in a row, and gauze 16 is wrapped outside the light well point perforated pipes 13; the light well spot floral tubes 13 are transversely connected with each other through a phi 63PPR water collecting pipe 14 and are connected into a vacuum pump 12 through a pump connecting rubber hose 15, and the vacuum pump 12 is used for dewatering so as to reduce foundation pit water, reduce disturbance to an original foundation stratum of a foundation and ensure the bearing capacity of the foundation of a station.
The light well spot perforated pipes 13 are arranged in a row at intervals of 3 meters in the width direction of a station foundation pit in a planar mode, the dots are distributed in a linear mode, the longitudinal distance of each well spot is 1 meter, every 6 well spots are connected into a group through a water collecting pipe 14, and a vacuum pump 12 is arranged on every two groups of well spots.
The light well-point perforated pipe 13 is 5 m long, a phi 25 plastic pipe is inserted into the substrate for 3 m, a small hole 2 m at the lower end of the light well-point perforated pipe 13 is formed into a perforated pipe as a water inlet channel, and the through length of the well pipe is wrapped by 80-mesh gauze to form two layers of filtering sandstone particles.
In the fifth step:
the thickened station bottom plate cushion layer 21 is poured, the thickness is thickened to 250mm, and C25 concrete is adopted.
The specific operations of abandoning the vacuum light well point dewatering structure 7 and plugging the bottom plate 23 are as follows: and after the pouring of the cushion layer 21 of the station bottom plate is finished, quickly pouring the station bottom plate 22. The pre-buried bottom plate sleeve pipe of crossing of station bottom plate is utilized to carry out the shutoff, crosses the bottom plate sleeve pipe and comprises stagnant water flange board, sedimentation tube, filter tube, the type of slowly expanding meets water inflation sealing rod, the sealed sticky tape of butyl rubber. After the vacuum light well point dewatering structure 7 is abandoned, the lower part in the sleeve is filled with concrete, the top of the sleeve is locked by a steel closing plate and a rubber sealing ring plate, and the upper part is filled with waterproof mortar to fill the bottom plate.
In the fifth step, the bottom plate plugging structure comprises a pre-buried bottom plate passing sleeve 28, and a filtering pipe 32 and a settling pipe 33 which are arranged up and down are arranged in the bottom plate passing sleeve 28; after the vacuum light well point dewatering structure 7 is removed, concrete is filled in the lower part of the interior of the bottom plate sleeve 28, the top of the sleeve is locked by a steel covering plate 24 and a rubber sealing ring plate 25, and the upper part of the sleeve is filled in the bottom plate by waterproof mortar 26. A water stop flange plate 27, a slow expansion type water swelling water stop strip 29 and a butyl rubber sealant adhesive tape 30 are arranged on the outer circumference of the bottom plate sleeve 28.
When a station foundation pit encounters a special stratum such as rich water red sandstone, the effect of a conventional precipitation and water-stop reinforcing method is poor, but the precipitation treatment method adopting the special design of step division and zone division is an economic, quick, safe and reliable implementation method, so that the condition that each step zone in the foundation pit is in an anhydrous state can be ensured, the bearing capacity of the bottom of the station foundation pit can be ensured, and the later-stage operation safety of a subway station can be ensured. The station foundation pit implemented by adopting the special dewatering method for the bottom of the station foundation pit in the water-rich red sandstone stratum has the advantages of large or small plane size, deep or shallow depth and wide application range according to the arrangement requirement of the station foundation pit.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.
Claims (8)
1. The treatment method of the subway station base groundwater in the water-rich red sandstone stratum is characterized by comprising the following steps of:
the method is realized by the following steps:
the method comprises the following steps: constructing a lateral water-stopping enclosure structure (1) in a station foundation pit of the red sandstone stratum (3);
step two: excavating foundation pits layer by layer in steps, and constructing a water collecting well (8) in the foundation pit when water seepage occurs in the foundation red sandstone layer;
step three: along with excavation of the foundation pit, in order to prevent underground water from flowing into the lower foundation pit, a water interception dam (9) is arranged;
step four: when the foundation pit is excavated to the upper part of the foundation pit bottom plate by 1 meter, the underground water at the bottom of the foundation pit is reduced and the disturbance to the undisturbed stratum is avoided by using the vacuum light well point dewatering structure (7), so that the bearing capacity of the station base is increased;
step five: excavating residual soil of a foundation pit, pouring a thickened station base cushion layer (21), pouring a station bottom plate (22), reserving a water dropping hole in the station bottom plate (22), and abandoning the vacuum light well point water dropping structure (7) after the station structure is closed and plugging the bottom plate.
2. The method for treating the groundwater of the subway station base in the water-rich red sandstone stratum according to claim 1, which is characterized by comprising the following steps of:
in the first step, the enclosure structure (1) is an underground continuous wall or an enclosure pile (2).
3. The method for treating the groundwater of the subway station base in the water-rich red sandstone stratum according to claim 1, which is characterized by comprising the following steps of:
in the second step, the water collecting well (8) comprises a vertical cylindrical close-packed reinforcement cage (17), 3 outer side reinforcing stirrups (19) are arranged around the close-packed reinforcement cage (17), 1 transverse 3 vertical inner side reinforcing stirrups (17) are arranged on the top surface and the bottom surface, and straws (18) are wrapped outside the close-packed reinforcement cage (17).
4. The method for treating the groundwater of the subway station base in the water-rich red sandstone stratum according to claim 1, which is characterized by comprising the following steps of:
in the third step, the water interception dam (9) is formed by combining a bamboo curtain (11) and a sand bag (10).
5. The method for treating the groundwater of the subway station base in the water-rich red sandstone stratum according to claim 1, which is characterized by comprising the following steps of:
in the fourth step, the vacuum light well point dewatering structure (7) comprises light well point perforated pipes (13) which are vertically arranged in a row, and gauze (16) is wrapped outside the light well point perforated pipes (13); the light well pattern pipes (13) are transversely connected through a water collecting pipe (14) and connected to a vacuum pump (12) through a pump connecting rubber hose (15), and precipitation is carried out through the vacuum pump (12).
6. The method for treating the groundwater of the subway station base in the water-rich red sandstone stratum according to claim 1, which is characterized by comprising the following steps of:
in the fourth step, the light well pattern pipes (13) are arranged in a row at intervals of 3 meters in the width direction of the station foundation pit in a planar mode, the points are distributed in a linear mode, the longitudinal distance between every two well points is 1 meter, every 6 well points are connected into a group through a water collecting pipe (14), and a vacuum pump (12) is arranged in every two groups of well points.
7. The method for treating the groundwater of the subway station base in the water-rich red sandstone stratum according to claim 1, which is characterized by comprising the following steps of:
in the fifth step, the bottom plate plugging structure comprises a pre-buried bottom plate passing sleeve (28), and a filtering pipe (32) and a settling pipe (33) which are arranged up and down are arranged in the bottom plate passing sleeve (28);
after the vacuum light well point dewatering structure (7) is eliminated, concrete is filled in the lower portion of the interior of a bottom plate sleeve (28), a steel covering plate (24) and a rubber sealing ring plate (25) are adopted to lock the top of the sleeve, and waterproof mortar (26) is utilized to fill the upper portion of the bottom plate.
8. The method for treating the groundwater of the subway station base in the water-rich red sandstone stratum according to claim 7, which is characterized by comprising the following steps:
a water stop flange plate (27), a slow expansion type water swelling water stop strip (29) and a butyl rubber sealing adhesive tape (30) are arranged on the periphery of the outer ring of the bottom plate sleeve (28).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010025690.1A CN111101532A (en) | 2020-01-10 | 2020-01-10 | Method for treating subway station base underground water in water-rich red sandstone stratum |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010025690.1A CN111101532A (en) | 2020-01-10 | 2020-01-10 | Method for treating subway station base underground water in water-rich red sandstone stratum |
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| CN111101532A true CN111101532A (en) | 2020-05-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111576460A (en) * | 2020-05-20 | 2020-08-25 | 中冶天工集团有限公司 | Pipe-well combined light well point pipe foundation pit dewatering system and use method thereof |
| CN114482105A (en) * | 2022-03-18 | 2022-05-13 | 中铁一局集团有限公司 | Construction method for plugging dewatering well group with strong pressure water after ultra-deep subway station is sealed |
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| CN207727600U (en) * | 2017-12-13 | 2018-08-14 | 中国一冶集团有限公司 | Plugging dewatering well device |
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2020
- 2020-01-10 CN CN202010025690.1A patent/CN111101532A/en active Pending
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| CN207727600U (en) * | 2017-12-13 | 2018-08-14 | 中国一冶集团有限公司 | Plugging dewatering well device |
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| CHAOYUN YU ET AL: "The effect of water on the creep behavior of red sandstone", 《ENGINEERING GEOLOGY》 * |
| 吴建政: "第三系富水半成岩砂岩段地铁车站深基坑地下水处理研究", 《中国优秀硕士学位论文全文数据库—工程科技II辑》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111576460A (en) * | 2020-05-20 | 2020-08-25 | 中冶天工集团有限公司 | Pipe-well combined light well point pipe foundation pit dewatering system and use method thereof |
| CN114482105A (en) * | 2022-03-18 | 2022-05-13 | 中铁一局集团有限公司 | Construction method for plugging dewatering well group with strong pressure water after ultra-deep subway station is sealed |
| CN114482105B (en) * | 2022-03-18 | 2024-04-16 | 中铁一局集团有限公司 | Precipitation well group plugging construction method with strong pressurized water after ultra-deep subway station is closed |
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Application publication date: 20200505 |