CN110777831A - Centralized drainage system and method for water burst during step-by-step excavation of deep foundation pit of subway station - Google Patents
Centralized drainage system and method for water burst during step-by-step excavation of deep foundation pit of subway station Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 306
- 238000009412 basement excavation Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/02—Arrangement of sewer pipe-lines or pipe-line systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
- E03F5/101—Dedicated additional structures, interposed or parallel to the sewer system
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/22—Adaptations of pumping plants for lifting sewage
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Abstract
The invention discloses a centralized drainage system and a centralized drainage method for subway station deep foundation pit stepped excavation water burst.A centralized drainage system for the stepped excavation water burst of the subway station deep foundation pit comprises an upper stepped water storage tank and a lower stepped water storage tank which are used for storing water for an upper step and a lower step, wherein the upper stepped water storage tank and the lower stepped water storage tank are connected through a water pipeline, and a drainage pipeline for outwards draining water is connected beside the water pipeline; the water pumping pipeline is connected with the lower step water storage tank at the port, and a water pump is arranged on the water pumping pipeline. The invention has simple structure, convenient operation and flexible use, can realize layered multi-stage control, has strong flexibility in pipeline erection, and saves a large amount of expenses of drainage equipment, electric charge, manpower maintenance, mechanical equipment use and the like.
Description
Technical Field
The invention relates to the technical field of water leakage discharge of deep foundation pit excavation, in particular to a centralized water discharge system and method for excavation water gushing of deep foundation pits of a subway station in stages.
Background
At present, urban subway construction in China develops rapidly, and the open cut method is often used as a first-choice construction method for subway station safety, and in the open cut method, although deep well precipitation in a three-shaft stirring pile water stop matching pit is widely used in subway fender pile foundation pit construction, along with the wide application of large-scale equipment, the deep foundation pit excavation is promoted at a higher speed, so that many practical difficulties are brought along, and new problems are met, such as deep foundation pit construction, and when the deep foundation pit is excavated to a water-bearing stratum, the water inflow is increased. The working face is greatly collected, the use and utilization rate of mechanical equipment is obviously reduced, the construction is difficult, and the engineering progress is seriously influenced. In the drainage operation of accumulated water in a foundation pit, a plurality of drainage points exist, a water pump (or a centrifugal pump) is respectively arranged at each drainage point, and each water pump uses an independent pipeline and an independent cable, so that the waste of electric power is easily caused; and along with the extension of foundation ditch excavation degree of depth, frequently remove cable and water pump, cause the very big waste scheduling problem of manpower and time, seriously influence the progress of construction.
The invention with the publication number of CN110080230A discloses a structure for treating water gushing at the bottom of a foundation pit, which comprises the following components: the cofferdam is arranged around the water burst part and used for blocking the connection between the water burst part and the outside, and a filtering material is filled in the cofferdam to form a filtering layer; the flow guide pipe is provided with a water inlet and a water outlet and used for guiding water at the water gushing position to flow out, the water inlet of the flow guide pipe extends into the cofferdam, and the water outlet of the flow guide pipe extends out of the cofferdam; the cover plate is covered on the cofferdam, and the cofferdam forms a closed space; and the operation platform covers the periphery of the cofferdam and the upper part of the cover plate and plays a role in sealing. The structure of the invention can effectively retain the silt brought out by the gushing water, prevent the silt from losing and reduce the probability of accidents. The construction method greatly shortens the construction time and ensures the construction progress of the project. But this technical scheme can't solve the drainage problem that a plurality of drainage points gushed water.
Notice No. CN 209066465U's utility model discloses a deep basal pit structure with draw row lateral wall and gush water belongs to foundation ditch waterproof engineering field, and it includes the foundation ditch, a plurality of water drainage tank have been seted up to the lateral wall department of gushing water of foundation ditch, the catch basin of intercommunication is seted up to the periphery at the bottom of the foundation ditch hole, is located on every foundation ditch lateral wall water drainage tank and corresponding the catch basin intercommunication. The utility model discloses can gush water to the part of foundation ditch lateral wall and concentrate drainage water treatment, have the effect that makes the difficult production ponding in construction place. This technical scheme only is applicable to the single foundation ditch and gushes water and draws the row, and needs the major structure cooperation, and the construction is complicated, can not be applicable to the drainage problem that gushes water when deep basal pit divides the step excavation.
Disclosure of Invention
The invention aims to provide a centralized drainage system and a centralized drainage method for deep foundation pit stepped excavation water burst of a subway station.
In order to solve the technical problems, the invention adopts the following technical scheme:
the centralized drainage system for the step-by-step excavation water burst of the deep foundation pit of the subway station comprises an upper step water storage tank and a lower step water storage tank which are used for storing water on upper and lower steps, wherein the upper step water storage tank and the lower step water storage tank are connected through a water conveying pipeline, and a drainage pipeline for outwards draining water is connected beside the water conveying pipeline;
the water pumping pipeline is connected beside the lower water delivery pipeline, the port of the water pumping pipeline is connected with the lower step water storage pool, and a water pump is arranged on the water pumping pipeline;
a first control valve and a third control valve are distributed on the upper water conveying pipeline, the third control valve is arranged close to the upper step water storage tank, and the first control valve is arranged at the downstream of the third control valve; a second control valve is arranged on the drainage pipeline; and a fourth control valve is arranged on the lower water conveying pipeline and is positioned at the position of the lower water conveying pipeline between the water pumping pipeline and the lower step water storage tank.
The upper step water storage pools are provided with a plurality of upper water conveying pipeline branches, and the upper water conveying pipeline branches are provided with a plurality of upper water conveying pipeline branches and are connected with the upper step water storage pools in a one-to-one correspondence mode.
The ports of the upper water conveying pipelines extend into the corresponding upper step water storage tanks respectively, and the ports of the lower water conveying pipelines extend into the lower step water storage tanks.
The water pump is a multistage centrifugal pump.
The volume of the lower step water storage tank is larger than that of the upper step water storage tank.
And pressure gauges are respectively arranged on the water conveying pipeline, the water drainage pipeline and/or the water pumping pipeline.
And a water hammer eliminator is arranged on the water conveying pipeline, the water drainage pipeline and/or the water pumping pipeline at the position of the corresponding pressure gauge downstream.
The invention also discloses a centralized drainage method for the metro station deep foundation pit excavation surge water in different steps, which comprises the steps of draining water by the water collection point of the lower step water storage tank and draining water from the upper step water storage tank to the lower step water storage tank;
wherein, the step of draining by the water collecting point of the lower step water storage tank is as follows: when the water collecting point of the upper step water storage tank does not reach the warning water level, normal drainage is only needed to be carried out aiming at the water collecting point of the lower step water storage tank, the first control valve and the fourth control valve are closed, and the second control valve is opened; when the water level at the water collecting point of the water storage tank of the lower step is insufficient, the fourth control valve is opened, and the multistage centrifugal pump is closed at the same time;
wherein, the step of draining water from the upper step water storage tank to the lower step water storage tank is as follows; when the water collecting point of the upper step water storage pool reaches the warning water level, the multistage centrifugal pump is opened at the moment, the first control valve and the third control valve which correspond to the upper water conveying pipeline are opened, the second control valve is closed, the fourth control valve is opened after the time delay is set, the multistage centrifugal pump is closed at the same time, and the water at the water collecting point of the upper step water storage pool can automatically flow to the water collecting point of the lower step water storage pool under the action of the siphon principle.
And in the step of discharging water from the upper step water storage tank to the lower step water storage tank, the delay set time is set to be 20-30 s.
The invention has the beneficial effects that:
the invention effectively solves the problem of difficult construction caused by obviously reduced use and utilization rate of mechanical equipment due to increased water collection amount of the foundation pit in the production process. The invention has simple structure, convenient operation and flexible use, can realize layered multi-stage control, has strong flexibility in pipeline erection, and saves a large amount of expenses of drainage equipment, electric charge, manpower maintenance, mechanical equipment use and the like.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1, the concentrated discharge system for the excavation of the deep foundation pit of the subway station in steps of the embodiment includes an upper step water storage tank 6 and a lower step water storage tank 7 for storing water on the upper step and the lower step, the upper step water storage tank 6 and the lower step water storage tank 7 are connected through a water pipeline, and a drainage pipeline 9 for discharging water outwards is connected beside the water pipeline.
In practical application, the water collecting pits are dug at main water seepage points of the upper step water storage tank 6 and the lower step water storage tank 7, attention is paid to the fact that the water collecting points at the position of the lower step water storage tank 7 have the water guiding function, and the size of the water collecting pits is larger than that of the upper step water storage tank 6.
The connection point of the drainage pipeline 9 on the water pipeline is used as a boundary, the water pipeline is divided into an upper water pipeline 81 close to the upper step water storage tank 6 and a lower water pipeline 82 close to the lower step water storage tank 7, a water pumping pipeline 10 is connected beside the lower water pipeline 82, the port of the water pumping pipeline 10 is connected with the lower step water storage tank 7, a multistage centrifugal pump is arranged on the water pumping pipeline 10, and the power parameter of the multistage centrifugal pump is mainly selected according to the water volume of the lower step water storage tank 7.
A first control valve 1 and a third control valve 3 are distributed on the upper water conveying pipeline 81, the third control valve 3 is arranged close to the upper step water storage tank 6, and the first control valve 1 is arranged at the downstream of the third control valve 3; a second control valve 2 is arranged on the drainage pipeline 9; a fourth control valve 4 is arranged on the lower water pipe 82, and the fourth control valve 4 is positioned at the position of the lower water pipe 81 between the water pumping pipe 10 and the lower step water storage tank 7.
The invention is provided with the control valve of the upper and lower step water collection points, and can select the flow speed and flow rate which are led into the water gushing pit of the lower step and discharged outside through the corresponding pipeline according to the actual water gushing condition of the foundation pit of the upper and lower steps.
According to the actual situation of the excavation of the deep foundation pit and the water-disaster prevention requirement, a plurality of upper step water storage pools 6 can be arranged, and a plurality of upper water conveying pipeline 81 branches of the water conveying pipeline are arranged and are connected with the upper step water storage pools in a one-to-one correspondence manner.
In this embodiment, the ports of the upper water pipes 81 extend into the corresponding upper step water storage tanks 6, and the ports of the lower water pipes 82 extend into the lower step water storage tanks 7.
In this embodiment, the water pipe, the water discharge pipe 9 and/or the water pumping pipe 10 are respectively provided with a pressure gauge, the pressure gauge is a conventional pressure gauge or a vacuum pressure gauge, the range is not less than 0.7MP when the conventional pressure gauge is adopted, and the range is preferably-0.1 MP when the vacuum pressure gauge is adopted. The water outlet pressure of a pressure gauge on the pipeline is not less than 2 times of the design pressure and not less than 1.6 MP. A water hammer eliminator is arranged behind a pressure gauge of the pipeline (according to the water outflow direction). The pressure gauge is connected with the water inlet and outlet pipeline by a thin water pipe with the diameter of 6mm, and the control valve is arranged on the water pipe, so that the pressure gauge is easy to overhaul.
The embodiment also discloses a centralized drainage method for the step-by-step excavation water burst of the deep foundation pit of the subway station, which comprises the step of draining water by the water collecting point of the lower step water storage tank and the step of draining water from the upper step water storage tank to the lower step water storage tank.
Wherein, the step of draining by the water collecting point of the lower step water storage tank 7 is as follows: when the water collecting point of the upper step water storage tank 6 does not reach the warning water level, normal drainage is only needed to be carried out aiming at the water collecting point of the lower step water storage tank 7, the first control valve 1 and the fourth control valve 4 are closed, and the second control valve 2 is opened; when the water level at the water collecting point of the lower step water storage tank 7 is insufficient, the fourth control valve 4 is opened, and the multistage centrifugal pump 5 is closed.
Wherein, the step of draining water from the upper step water storage tank 6 to the lower step water storage tank 7 is as follows; when the water collecting point of the upper step water storage pool 6 reaches the warning water level, the multistage centrifugal pump 5 is opened, the first control valve 1 and the third control valve 3 corresponding to the upper water conveying pipeline 81 are opened, the second control valve 2 is closed, the fourth control valve 4 is opened after the time delay of 30s, the multistage centrifugal pump 5 is closed, and the water at the water collecting point of the upper step water storage pool 6 automatically flows to the water collecting point of the lower step water storage pool 7 under the action of the siphon principle.
It should be noted that the fourth control valve 4 is always in the closed state under the normal external drainage condition. Meanwhile, the water level conditions of the water collecting pits of the upper step water storage tank and the lower step water storage tank are observed, and the water is drained outside in time when the warning water level is reached. The water level of the water storage tank with the top step is noticed, and when the water level is not enough, the multistage centrifugal pump is closed in time, so that the multistage centrifugal pump is prevented from being burnt out.
In actual work, aiming at laying of the pipeline, if the weather is cold in winter, the pipeline and the step can form an included angle of less than 3 degrees, so that on one hand, the resistance of 'siphon' can be reduced, and on the other hand, the phenomenon that the temperature is too low in winter, water in the pipeline cannot be discharged out, and the pipeline is frozen is avoided. In winter, the anti-freezing work of the multistage centrifugal pump needs to be done, water of the lower balance pipe needs to be discharged in time when the centrifugal pump is stopped, and the nut of the balance pipe is re-reinforced before the centrifugal pump is restarted next time. Each control valve is a key control point and is replaced if damaged.
The invention puts the multi-stage centrifugal pump at the lower step water storage tank 7, and installs the control valve at the corresponding position of the pipeline as shown in figure 1, and the water collecting point of the upper step water storage tank 6 does not need the centrifugal pump, the water pump and the cable. By using the siphon method principle, the water gushing from the upper step is converged to the water collecting point of the lower step under the condition of no need of electric power, and then is uniformly discharged by using the multistage centrifugal pump. The method reduces the labor cost, and only two workers are needed for each water collecting point in the prior common method for draining water; the length of the cable and the number of the water pumps are reduced, a centrifugal pump and a submersible pump are required to be arranged at each drainage point for drainage by the conventional common method, only one multistage centrifugal pump and one submersible pump are required to be arranged at the lowest water collection point in the method, and unnecessary maintenance of the centrifugal pump is reduced compared with the conventional method; the length of the steel pipe and the cable is reduced, and because each water collecting point is not provided with an independent drainage system in the past, the use amount and the installation amount of the steel pipe and the cable are saved, so that the labor amount of workers and the maintenance and overhaul cost of the pipeline are reduced. The invention can realize layered multi-level control and is more flexible to use.
The invention effectively solves the problem of difficult construction caused by obviously reduced use and utilization rate of mechanical equipment due to increased water collection amount of the foundation pit in the production process. The invention has simple structure, convenient operation and flexible use, can realize layered multi-stage control, has strong flexibility in pipeline erection, and saves a large amount of expenses of drainage equipment, electric charge, manpower maintenance, mechanical equipment use and the like.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the scope of the present invention.
Claims (9)
1. Subway station deep basal pit divides step excavation to gush out concentrated outer drainage system of water, its characterized in that: the water storage device comprises an upper step water storage tank and a lower step water storage tank which are used for storing water on upper and lower steps, wherein the upper step water storage tank and the lower step water storage tank are connected through a water delivery pipeline, and a drainage pipeline for draining water outwards is connected beside the water delivery pipeline;
the water pumping pipeline is connected beside the lower water delivery pipeline, the port of the water pumping pipeline is connected with the lower step water storage pool, and a water pump is arranged on the water pumping pipeline;
a first control valve and a third control valve are distributed on the upper water conveying pipeline, the third control valve is arranged close to the upper step water storage tank, and the first control valve is arranged at the downstream of the third control valve; a second control valve is arranged on the drainage pipeline; and a fourth control valve is arranged on the lower water conveying pipeline and is positioned at the position of the lower water conveying pipeline between the water pumping pipeline and the lower step water storage tank.
2. The centralized drainage system for water burst of step-by-step excavation of deep foundation pits of subway stations as claimed in claim 1, characterized in that: the upper step water storage pools are provided with a plurality of upper water conveying pipeline branches, and the upper water conveying pipeline branches are provided with a plurality of upper water conveying pipeline branches and are connected with the upper step water storage pools in a one-to-one correspondence mode.
3. The centralized drainage system for water burst of step-by-step excavation of deep foundation pits of subway stations as claimed in claim 1, characterized in that: the ports of the upper water conveying pipelines extend into the corresponding upper step water storage tanks respectively, and the ports of the lower water conveying pipelines extend into the lower step water storage tanks.
4. The centralized drainage system for water burst of step-by-step excavation of deep foundation pits of subway stations as claimed in claim 1, characterized in that: the water pump is a multistage centrifugal pump.
5. The centralized drainage system for water burst of step-by-step excavation of deep foundation pits of subway stations as claimed in claim 1, characterized in that: the volume of the lower step water storage tank is larger than that of the upper step water storage tank.
6. The centralized drainage system for water burst of step-by-step excavation of deep foundation pits of subway stations as claimed in claim 1, characterized in that: and pressure gauges are respectively arranged on the water conveying pipeline, the water drainage pipeline and/or the water pumping pipeline.
7. The centralized drainage system for water burst of step-by-step excavation of deep foundation pits of subway stations as claimed in claim 6, wherein: and a water hammer eliminator is arranged on the water conveying pipeline, the water drainage pipeline and/or the water pumping pipeline at the position of the corresponding pressure gauge downstream.
8. The centralized water discharge method for excavation of deep foundation pit of subway station by steps is characterized by comprising the following steps: comprises a step of draining water from a water collecting point of a lower step water storage tank and a step of draining water from an upper step water storage tank to a lower step water storage tank;
wherein, the step of draining by the water collecting point of the lower step water storage tank is as follows: when the water collecting point of the upper step water storage tank does not reach the warning water level, normal drainage is only needed to be carried out aiming at the water collecting point of the lower step water storage tank, the first control valve and the fourth control valve are closed, and the second control valve is opened; when the water level at the water collecting point of the water storage tank of the lower step is insufficient, the fourth control valve is opened, and the multistage centrifugal pump is closed at the same time;
wherein, the step of draining water from the upper step water storage tank to the lower step water storage tank is as follows; when the water collecting point of the upper step water storage pool reaches the warning water level, the multistage centrifugal pump is opened at the moment, the first control valve and the third control valve which correspond to the upper water conveying pipeline are opened, the second control valve is closed, the fourth control valve is opened after the time delay is set, the multistage centrifugal pump is closed at the same time, and the water at the water collecting point of the upper step water storage pool can automatically flow to the water collecting point of the lower step water storage pool under the action of the siphon principle.
9. The centralized drainage method for the water burst of the step-by-step excavation of the deep foundation pit of the subway station as claimed in claim 8, wherein: and in the step of discharging water from the upper step water storage tank to the lower step water storage tank, the delay set time is set to be 20-30 s.
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| CN201911035931.4A CN110777831A (en) | 2019-10-29 | 2019-10-29 | Centralized drainage system and method for water burst during step-by-step excavation of deep foundation pit of subway station |
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| CN201911035931.4A CN110777831A (en) | 2019-10-29 | 2019-10-29 | Centralized drainage system and method for water burst during step-by-step excavation of deep foundation pit of subway station |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110206584A (en) * | 2019-06-24 | 2019-09-06 | 武汉工程大学 | The discharging system and method for open pit mine hole water burst based on siphon |
| DE202019104291U1 (en) * | 2019-04-15 | 2019-09-16 | Nanjing Hydraulic Research Institute | Siphon water exchange system for the use of rainwater resources in a reservoir |
| CN211547778U (en) * | 2019-10-29 | 2020-09-22 | 中铁隧道集团二处有限公司 | Centralized drainage system for water burst of subway station deep foundation pit step-by-step excavation |
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- 2019-10-29 CN CN201911035931.4A patent/CN110777831A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202019104291U1 (en) * | 2019-04-15 | 2019-09-16 | Nanjing Hydraulic Research Institute | Siphon water exchange system for the use of rainwater resources in a reservoir |
| CN110206584A (en) * | 2019-06-24 | 2019-09-06 | 武汉工程大学 | The discharging system and method for open pit mine hole water burst based on siphon |
| CN211547778U (en) * | 2019-10-29 | 2020-09-22 | 中铁隧道集团二处有限公司 | Centralized drainage system for water burst of subway station deep foundation pit step-by-step excavation |
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