CN211547778U - Centralized drainage system for water burst of subway station deep foundation pit step-by-step excavation - Google Patents
Centralized drainage system for water burst of subway station deep foundation pit step-by-step excavation Download PDFInfo
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- CN211547778U CN211547778U CN201921831860.4U CN201921831860U CN211547778U CN 211547778 U CN211547778 U CN 211547778U CN 201921831860 U CN201921831860 U CN 201921831860U CN 211547778 U CN211547778 U CN 211547778U
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Abstract
The utility model discloses a centralized external drainage system for the water burst of the deep foundation pit of a subway station by stage excavation, which comprises an upper step water storage tank and a lower step water storage tank 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 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 utility model discloses bright simple structure, convenient operation, use are nimble, can realize layering multilevel control, and the pipeline frame sets up also has very strong flexibility, has practiced thrift expenses such as a large amount of drainage equipment, charges of electricity, manpower maintenance and mechanical equipment use.
Description
Technical Field
The utility model relates to an outer technical field of arranging of leaking of deep basal pit excavation, concretely relates to subway station deep basal pit divides bench excavation to gush out concentrated outer row system of water.
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 utility model discloses a structure can remain the silt particle that gushes water and take out effectively, prevents that the silt particle from running off, reduces the probability that the accident appears. The utility model discloses a construction method, very big shortening the engineering time has guaranteed the construction progress of engineering. 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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a subway station deep basal pit divides step excavation to gush out concentrated outer discharge system of water.
In order to solve the technical problem, the utility model 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 utility model has the advantages that:
the utility model discloses effectively solved in the production process because the increase of foundation ditch catchment volume and the mechanical equipment that leads to uses and the utilization ratio obviously descends, leads to the problem of construction difficulty. The utility model has the advantages of being simple in structure and convenient in operation, use in a flexible way, can realize layering multilevel control, the pipeline erects also has very strong flexibility, has practiced thrift expenses such as a large amount of drainage equipment, charges of electricity, manpower maintenance and mechanical equipment use.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
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 utility model discloses set up the control valve of above-mentioned upper and lower step catchment point, can according to the actual condition of gushing water of upper and lower step foundation ditch select to gush the pit and outer row velocity of flow and the flow of gushing water through the leading-in lower part step of corresponding pipeline.
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 utility model discloses put multistage centrifugal pump to lower part step tank 7 department to at pipeline relevant position installation control flap as shown in figure 1, 6 collection water points of upper portion step tank do not need centrifugal pump, water pump and cable conductor. 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 utility model discloses can realize layering multilevel control, comparatively nimble use.
The utility model discloses effectively solved in the production process because the increase of foundation ditch catchment volume and the mechanical equipment that leads to uses and the utilization ratio obviously descends, leads to the problem of construction difficulty. The utility model has the advantages of being simple in structure and convenient in operation, use in a flexible way, can realize layering multilevel control, the pipeline erects also has very strong flexibility, has practiced thrift expenses such as a large amount of drainage equipment, charges of electricity, manpower maintenance and mechanical equipment use.
The above embodiments are only used for illustrating but not limiting the technical solutions of the present invention, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention may be modified or substituted with equivalents without departing from the spirit and scope of the invention, which should be construed as being limited only by the claims.
In the description of the present invention, it should be understood that the terms "front", "back", "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 to which the description refers must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
Claims (7)
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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921831860.4U CN211547778U (en) | 2019-10-29 | 2019-10-29 | Centralized drainage system for water burst of subway station deep foundation pit step-by-step excavation |
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| CN201921831860.4U CN211547778U (en) | 2019-10-29 | 2019-10-29 | Centralized drainage system for water burst of subway station deep foundation pit step-by-step excavation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110777831A (en) * | 2019-10-29 | 2020-02-11 | 中铁隧道集团二处有限公司 | Centralized drainage system and method for water burst during step-by-step excavation of deep foundation pit of subway station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110777831A (en) * | 2019-10-29 | 2020-02-11 | 中铁隧道集团二处有限公司 | Centralized drainage system and method for water burst during step-by-step excavation of deep foundation pit of subway station |
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