CN113944180B - Construction method for pumping drainage and precipitation of existing basement - Google Patents
Construction method for pumping drainage and precipitation of existing basement Download PDFInfo
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- CN113944180B CN113944180B CN202111279187.XA CN202111279187A CN113944180B CN 113944180 B CN113944180 B CN 113944180B CN 202111279187 A CN202111279187 A CN 202111279187A CN 113944180 B CN113944180 B CN 113944180B
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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
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/17—Geometrical or physical properties including an electric conductive element
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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Abstract
The invention discloses a construction method for pumping and draining precipitation of an existing basement, which belongs to the technical field of basement precipitation construction, wherein a pumping and draining precipitation structure is formed on the basis of an electroosmosis method, and comprises an electrode drainage system, a pressure control system, a fixer, a flange, a control valve, a pressure gauge, a booster pump and a drainage system; the electrode drainage system is provided with a direct current power supply system, an electrode drainage pipe, a filter screen and an electrode filter layer from inside to outside respectively, and the construction method for pumping drainage and precipitation of the existing basement is implemented by adopting the following steps: testing the drainage flow by an electroosmosis method; testing pressure-controlled pumping drainage precipitation; testing the deformation controllability pumping drainage precipitation; and (5) automatic construction of drainage and precipitation. The invention forms a pumping drainage precipitation structure based on the method, realizes the active pumping drainage of the high water level of the existing basement by arranging facilities such as an electrode drainage system, a pressure control system and the like, can realize the effective reduction of the water level of the basement, and ensures that fine particles are not lost.
Description
Technical Field
The invention relates to the technical field of basement dewatering construction, in particular to a construction method for pumping drainage and dewatering of an existing basement.
Background
With the rapid growth of national economy, land is increasingly scarce, and underground space development and utilization are more and more common and more emphasized. At present, basements are arranged in a large number of buildings in China to serve as garages, storerooms and the like, even underground houses, underground supermarkets and the like exist in a large number, and in order to ensure the safety of the basements and ensure a dry and healthy environment, the waterproof and drainage of the basements become an important work in the design and construction of the basements.
Since the outer wall and the bottom plate of the basement are both located below the ground and are often eroded by underground water, the measures of water and moisture resistance are an important part in the design of the basement structure. Existing basement moisture and water proofing techniques typically employ the application of waterproofing materials to prevent water from penetrating the basement floor. However, in the basement with excessive water, the effect of preventing water seepage only through the waterproof material is not good, the basement is still in a very humid state, and when underground water is accumulated outside the concrete side wall, the underground water and the concrete side wall generate large water pressure, so that the water seepage phenomenon of the basement occurs due to the excessive external water pressure. Therefore, in order to ensure the dry environment of the existing basement, the water around the basement needs to be pumped and drained, so the invention provides a construction method for pumping and draining the existing basement to reduce the water level.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a construction method for pumping drainage and precipitation of the existing basement, and overcomes the defects in the prior art. The pumping drainage precipitation structure is formed based on the electroosmosis method, active pumping drainage is carried out on the high water level of the existing basement by arranging facilities such as an electrode drainage system and a pressure control system, the water level of the basement can be effectively reduced, and fine particles are prevented from losing.
A construction method for pumping and draining precipitation of an existing basement is characterized in that a pumping and draining precipitation structure is formed based on an electroosmosis method, and comprises an electrode drainage system, a pressure control system, a fixer, a flange, a control valve, a pressure gauge, a booster pump and a drainage system; the electrode drainage system is connected with the pressure control system through a flange; a plurality of sections of drainage pipelines are connected between the pressure control system and the booster pump, drainage pipelines are connected between the booster pump and the drainage system, and the drainage pipelines are connected through flanges; the electrode drainage system is respectively provided with a direct current power supply system, an electrode drainage pipe, a filter screen and an electrode filtering layer from inside to outside, and the electrode drainage pipe is connected with the filter screen and the filter screen is connected with the electrode filtering layer through bolts; the pressure control system comprises a control valve, a pressure gauge and a flow meter; the electrode drain pipe is of a hollow round pipe type structure, and a drain hole is formed in the outer surface of the electrode drain pipe; the electrode filter layer is of a double-sleeve circular tube structure, the inner sleeve and the outer sleeve are both of hollow structures, drain holes are formed in the surfaces of the inner sleeve and the outer sleeve, the inner sleeve and the outer sleeve are connected through a bolt support frame, and a filter material is arranged in a cavity between the inner sleeve and the outer sleeve; a fixer is arranged at the joint of the electrode drainage system and the surface of the bottom plate in the water collecting pit, and a displacement sensor is arranged on the surface of the bottom plate in the water collecting pit; the construction method for pumping drainage and precipitation of the existing basement comprises the following steps:
step 1: testing the drainage flow by an electroosmosis method;
replacing a filter material in an electrode filter layer before each test, immersing an electrode drainage system in water, changing voltage by adopting a direct current power supply system, pumping water with different pressure and different flow at the bottom of a pipe well, monitoring the water flow in a pressure control system by adopting a flowmeter in the process, and acquiring a data set A of the corresponding relation between the voltage, the pumping water pressure and the monitored water flow in an initial state;
step 2: testing pressure-controlled pumping drainage precipitation;
a control valve in the pressure control system and the electrode drainage system are kept in a closed state, when the pressure monitored by the pressure gauge is greater than or equal to a pressure relief early warning value, the control valve is opened, and a flowmeter is adopted to continuously monitor the water flow in the pressure control system; taking the water pressure monitored by a pressure gauge at the moment of opening the control valve and the design voltage of pumping drainage precipitation as references, and obtaining the reference water flow corresponding to the water pressure and the design voltage under the reference condition by referring to the data set A; if the initial water flow after the control valve is opened is greater than 80% of the reference water flow, keeping the existing state unchanged; if the initial water flow after the control valve is opened is less than 80% of the reference water flow, starting the direct current power supply system according to the design voltage, and changing the attributes of the cathode and the anode of the electrode at set intervals; if the pressure gauge is continuously smaller than the pressure relief early warning value, the property of the cathode and the anode of the electrode is changed for 1 time on the well pipe within 7 d;
and step 3: testing the deformation controllability pumping drainage precipitation;
continuously monitoring the vertical displacement of the surface of the bottom plate in the sump by using a displacement sensor, and starting an electrode drainage system and increasing the voltage to 2-3 times of a design value when the vertical displacement monitored by the displacement sensor is greater than or equal to a deformation early warning value; when the vertical displacement monitored by the displacement sensor is greater than or equal to the deformation early warning value and the vertical displacement growth rate reaches the deformation rate warning value, the voltage of the electrode drainage system is increased to 3-5 times of the design value, and a booster pump is started to start active drainage construction operation;
and 4, step 4: automatic construction of drainage and precipitation;
in a first mode: when the pressure monitored by the pressure gauge is smaller than the pressure relief early warning value and the vertical displacement monitored by the displacement sensor is smaller than the deformation early warning value, a control valve in the pressure control system keeps a closed state, and the electrode drainage system keeps a closed state;
and a second mode: when the pressure monitored by the pressure gauge is greater than or equal to the pressure relief early warning value and the vertical displacement monitored by the displacement sensor is smaller than the deformation early warning value, opening the control valve, and performing pumping drainage and precipitation according to the requirements of the pressure-controlled pumping drainage and precipitation test in the step 2;
and a third mode: when the vertical displacement monitored by the displacement sensor is greater than or equal to the deformation early warning value and no matter the pressure monitored by the pressure gauge is in any state, opening the control valve, starting the electrode drainage system, and performing drainage and precipitation according to the requirements of the deformation-controlled drainage and precipitation test in the step 3;
the drainage structure freely switches the three modes according to the pressure value monitored by the pressure gauge, the vertical displacement monitored by the displacement sensor and the growth rate of the vertical displacement, so that the underground water is finally discharged through the drainage system.
Preferably, the pressure relief early warning value is 0.2MPa-0.5MPa, the deformation early warning value is 5mm-10mm, and the deformation rate warning value is 0.2mm/d-0.5mm/d.
Preferably, the set time for changing the properties of the cathode and the anode is 1d-3d.
Preferably, when the vertical displacement monitored by the displacement sensor is greater than or equal to the deformation early warning value and the vertical displacement growth rate reaches the deformation rate warning value, a plurality of drainage air pipes are arranged on the inner surface of the pressure control system, high-pressure air is sprayed into the drainage pipeline through the drainage air pipes and is sprayed from the pressure control system to the drainage system, and a negative pressure effect is generated to drive underground water to be discharged in an accelerated manner.
Preferably, the voltage design value of the electrode drainage system is 32V-110V.
The invention has the following beneficial technical effects:
based on the method forms pump drainage precipitation structure, realizes taking the initiative pump drainage to existing basement high water level through setting up facilities such as electrode drainage system, pressure control system, can realize effectively reducing the basement water level, and guarantees that the fine particle does not run off.
Drawings
Fig. 1 is a schematic diagram of a pumping drainage precipitation structure in a construction method for pumping drainage precipitation of an existing basement.
Fig. 2 is a construction flow chart of the construction method for pumping drainage and precipitation of the existing basement.
Wherein, 1-bottom plate, 2-electrode drainage system, 3-fixer, 4-pressure control system, 5-flange, 6-control valve, 7-pressure gauge, 8-booster pump, 9-drainage system, and 10-water collecting pit.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
example 1:
as shown in fig. 1 and 2, a construction method for pumping and dewatering an existing basement forms a pumping and dewatering structure based on an electroosmosis method, wherein the pumping and dewatering structure comprises an electrode drainage system 2, a fixer 3, a pressure control system 4, a flange 5, a control valve 6, a pressure gauge 7, a booster pump 8 and a drainage system 9; the electrode drainage system 2 is connected with the pressure control system 4 through a flange 5; a plurality of sections of drainage pipelines are connected between the pressure control system 4 and the booster pump 8, drainage pipelines are connected between the booster pump 8 and the drainage system 9, and the drainage pipelines are connected through flanges 5; the electrode drainage system 2 is respectively provided with a direct current power supply system, an electrode drainage pipe, a filter screen and an electrode filtering layer from inside to outside, and the electrode drainage pipe is connected with the filter screen and the filter screen is connected with the electrode filtering layer through bolts; the pressure control system 4 comprises a control valve 6, a pressure gauge 7 and a flow meter; the electrode drain pipe is of a hollow round pipe type structure, and a drain hole is formed in the outer surface of the electrode drain pipe; the electrode filter layer is of a double-sleeve circular tube structure, the inner sleeve and the outer sleeve are both of hollow structures, drain holes are formed in the surfaces of the inner sleeve and the outer sleeve, the inner sleeve and the outer sleeve are connected through a bolt support frame, and a filter material is arranged in a cavity between the inner sleeve and the outer sleeve; a fixer 3 is arranged at the joint of the electrode drainage system 2 and the surface of the bottom plate 1 in the water collection pit, and a displacement sensor is arranged on the surface of the bottom plate 1 in the water collection pit; the construction method for pumping drainage and precipitation of the existing basement comprises the following steps:
step 1: testing the drainage flow by an electroosmosis method;
replacing a filter material in an electrode filter layer before each test, immersing the electrode drainage system 2 in water, changing voltage by adopting a direct current power supply system, pumping water with different pressure and different flow at the bottom of a pipe well, monitoring water flow in a pressure control system 4 by adopting a flowmeter in the process, and acquiring a data set A of corresponding relation of the voltage, the pumped water pressure and the monitored water flow in an initial state;
step 2: testing pressure-controlled pumping drainage precipitation;
the control valve 6 in the pressure control system 4 and the electrode drainage system 2 are kept in a closed state, when the pressure monitored by the pressure gauge 7 is greater than or equal to a pressure relief early warning value, the control valve 6 is opened, and the flow meter is adopted to continuously monitor the water flow in the pressure control system 4; taking the water pressure and the design voltage of pumping drainage precipitation monitored by the pressure gauge 7 at the moment of opening the control valve 6 as references, and obtaining the reference water flow corresponding to the water pressure and the design voltage under the reference condition by referring to the data set A; if the initial water flow after the control valve 6 is opened is greater than 80% of the reference water flow, the existing state is kept unchanged; if the initial water flow after the control valve 6 is opened is less than 80% of the reference water flow, starting the direct current power supply system according to the designed voltage, and changing the attributes of the cathode and the anode of the electrode at set intervals; if the pressure gauge 7 is continuously smaller than the pressure relief early warning value, the attribute of the cathode and the anode of the electrode is changed for 1 time on the well pipe within 7 d;
and step 3: testing the deformation controllability pumping drainage precipitation;
continuously monitoring the vertical displacement of the surface of the bottom plate 1 in the sump by using a displacement sensor, and starting the electrode drainage system 2 and increasing the voltage to 2 times of a design value when the vertical displacement monitored by the displacement sensor is greater than or equal to a deformation early warning value; when the vertical displacement monitored by the displacement sensor is greater than or equal to the deformation early warning value and the vertical displacement growth rate reaches the deformation rate warning value, the voltage of the electrode drainage system 2 is increased to 3 times of the design value, and the booster pump 8 is started to start active drainage construction operation;
and 4, step 4: automatic construction of drainage and precipitation;
the first mode is as follows: when the pressure monitored by the pressure gauge 7 is smaller than the pressure relief early warning value and the vertical displacement monitored by the displacement sensor is smaller than the deformation early warning value, the control valve 6 in the pressure control system 4 keeps a closed state, and the electrode drainage system 2 keeps a closed state;
and a second mode: when the pressure monitored by the pressure gauge 7 is greater than or equal to the pressure relief early warning value and the vertical displacement monitored by the displacement sensor is less than the deformation early warning value, opening the control valve 6, and performing pumping drainage and precipitation according to the requirements of the pressure-controlled pumping drainage and precipitation test in the step 2;
and a third mode: when the vertical displacement monitored by the displacement sensor is greater than or equal to the deformation early warning value and no matter the pressure monitored by the pressure gauge 7 is in any state, the control valve 6 is opened, the electrode drainage system 2 is started, and drainage and precipitation are carried out according to the requirements of the deformation-controlled drainage and precipitation test in the step 3;
the drainage structure freely switches the three modes according to the pressure value monitored by the pressure gauge 7, the vertical displacement monitored by the displacement sensor and the growth rate of the vertical displacement according to the rule of the automatic construction in the step, so that the underground water is finally discharged through the drainage system 9.
Preferably, the pressure relief early warning value is 0.2MPa, the deformation early warning value is 5mm, and the deformation rate warning value is 0.2mm/d.
Preferably, the set time for changing the properties of the cathode and the anode is 1d.
Preferably, when the vertical displacement monitored by the displacement sensor is greater than or equal to the deformation early warning value and the vertical displacement growth rate reaches the deformation rate warning value, a plurality of drainage pipes are arranged on the inner surface of the pressure control system 4, high-pressure gas is sprayed into the drainage pipes through the drainage pipes, the high-pressure gas is sprayed from the pressure control system 4 to the drainage system 9, and a negative pressure effect is generated to drive the underground water to be discharged in an accelerated manner.
Preferably, the designed voltage value of the electrode drainage system 2 is 32V.
Example 2:
when the sand bed that permeates water by force under bottom plate 1 in existing basement, the sump pit is set to the trompil on bottom plate 1, installs pump drainage precipitation structure in the sump pit again, adopts following step to construct:
as shown in fig. 1 and 2, a construction method for pumping and dewatering an existing basement forms a pumping and dewatering structure based on an electroosmosis method, wherein the pumping and dewatering structure comprises an electrode drainage system 2, a pressure control system 4, a fixer 3, a flange 5, a control valve 6, a pressure gauge 7, a booster pump 8 and a drainage system 9; the electrode drainage system 2 is connected with the pressure control system 4 through a flange 5; a plurality of sections of drainage pipelines are connected between the pressure control system 4 and the booster pump 8, drainage pipelines are connected between the booster pump 8 and the drainage system 9, and the drainage pipelines are connected through flanges 5; the electrode drainage system 2 is respectively provided with a direct current power supply system, an electrode drainage pipe, a filter screen and an electrode filtering layer from inside to outside, and the electrode drainage pipe is connected with the filter screen and the filter screen is connected with the electrode filtering layer through bolts; the pressure control system 4 comprises a control valve 6, a pressure gauge 7 and a flow meter; the electrode drain pipe is of a hollow round pipe type structure, and a drain hole is formed in the outer surface of the electrode drain pipe; the electrode filter layer is of a double-sleeve circular tube structure, the inner sleeve and the outer sleeve are both of hollow structures, drain holes are formed in the surfaces of the inner sleeve and the outer sleeve, the inner sleeve and the outer sleeve are connected through a bolt support frame, and a filter material is arranged in a cavity between the inner sleeve and the outer sleeve; the electrode drainage system 2 is provided with a fixer 3 at the joint of the bottom plate 1 surface in the sump pit, and the bottom plate 1 surface in the sump pit is provided with a displacement sensor.
Step 1: testing the drainage flow by an electroosmosis method;
replacing a filter material in an electrode filter layer before testing, immersing the electrode drainage system 2 in water, changing voltage by adopting a direct current power supply system, pumping water with different pressure and different flow at the bottom of a pipe well, monitoring the water flow in a pressure control system 4 by adopting a flowmeter in the process, and acquiring a data set A of the corresponding relation between the voltage, the pumped water pressure and the monitored water flow in an initial state;
step 2: testing the pressure control pumping drainage precipitation;
the control valve 6 in the pressure control system 4 and the electrode drainage system 2 are kept in a closed state, when the pressure monitored by the pressure gauge 7 is greater than or equal to a pressure relief early warning value, the control valve 6 is opened, and the water flow in the pressure control system 4 is continuously monitored by adopting a flowmeter; taking the water pressure and the design voltage of pumping drainage precipitation monitored by the pressure gauge 7 at the moment of opening the control valve 6 as references, and obtaining the reference water flow corresponding to the water pressure and the design voltage under the reference condition by referring to the data set A; if the initial water flow after the control valve 6 is opened is greater than 80% of the reference water flow, keeping the existing state unchanged; if the initial water flow after the control valve 6 is opened is less than 80% of the reference water flow, starting the direct current power supply system according to the design voltage, and changing the attributes of the cathode and the anode of the electrode at set intervals; if the pressure gauge 7 is continuously smaller than the pressure relief early warning value, the attribute of the cathode and the anode of the electrode is changed for 1 time on the well pipe within 7 d;
and step 3: testing the deformation controllability pumping drainage precipitation;
continuously monitoring the vertical displacement of the surface of the bottom plate 1 in the sump by using a displacement sensor, and starting the electrode drainage system 2 and increasing the voltage to 2-3 times of a design value when the vertical displacement monitored by the displacement sensor is greater than or equal to a deformation early warning value; when the vertical displacement monitored by the displacement sensor is greater than or equal to the deformation early warning value and the vertical displacement growth rate reaches the deformation rate warning value, the voltage of the electrode drainage system 2 is increased to 3-5 times of the design value, and a booster pump 8 is started to start active drainage construction operation;
and 4, step 4: automatic construction of drainage and precipitation;
the first mode is as follows: when the pressure monitored by the pressure gauge 7 is smaller than the pressure relief early warning value and the vertical displacement monitored by the displacement sensor is smaller than the deformation early warning value, the control valve 6 in the pressure control system 4 keeps a closed state, and the electrode drainage system 2 keeps a closed state;
and a second mode: when the pressure monitored by the pressure gauge 7 is greater than or equal to the pressure relief early warning value and the vertical displacement monitored by the displacement sensor is smaller than the deformation early warning value, opening the control valve 6, and performing pumping drainage and precipitation according to the requirements of the pressure-controlled pumping drainage and precipitation test in the step 2;
and a third mode: when the vertical displacement monitored by the displacement sensor is greater than or equal to the deformation early warning value and no matter the pressure monitored by the pressure gauge 7 is in any state, the control valve 6 is opened, the electrode drainage system 2 is started, and drainage and precipitation are carried out according to the requirements of the deformation-controlled drainage and precipitation test in the step 3;
the drainage structure freely switches the three modes according to the pressure value monitored by the pressure gauge 7, the vertical displacement monitored by the displacement sensor and the growth rate of the vertical displacement according to the rule of the automatic construction in the step, so that the underground water is finally discharged through the drainage system 9.
Preferably, the pressure relief early warning value is 0.5MPa, the deformation early warning value is 10mm, and the deformation rate warning value is 0.5mm/d.
Preferably, the set time for changing the properties of the cathode and the anode is 3d.
Preferably, when the vertical displacement monitored by the displacement sensor is greater than or equal to the deformation early warning value and the vertical displacement growth rate reaches the deformation rate warning value, a plurality of drainage pipes are arranged on the inner surface of the pressure control system 4, high-pressure gas is sprayed into the drainage pipes through the drainage pipes, the high-pressure gas is sprayed from the pressure control system 4 to the drainage system 9, and a negative pressure effect is generated to drive the underground water to be discharged in an accelerated manner.
Preferably, the designed voltage value of the electrode drainage system 2 is 110V.
The invention relates to a construction method for pumping drainage and precipitation of an existing basement, which is characterized in that a pumping drainage and precipitation structure is formed on the basis of the method, and active pumping drainage of the high water level of the existing basement is realized by arranging facilities such as an electrode drainage system, a pressure control system and the like, so that the water level of the basement can be effectively reduced, and fine particles are prevented from losing.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (5)
1. A construction method for pumping and draining precipitation of an existing basement is characterized in that a water collecting pit is formed by opening holes in a bottom plate of the existing basement, a pumping and draining precipitation structure is installed in the water collecting pit and is formed based on an electroosmosis method, and the pumping and draining precipitation structure comprises an electrode drainage system, a pressure control system, a fixer, a flange, a booster pump and a drainage system; the electrode drainage system is connected with the pressure control system through a flange; a plurality of sections of drainage pipelines are connected between the pressure control system and the booster pump, drainage pipelines are connected between the booster pump and the drainage system, and the drainage pipelines are connected through flanges; the electrode drainage system is respectively provided with a direct current power supply system, an electrode drainage pipe, a filter screen and an electrode filtering layer from inside to outside, and the electrode drainage pipe is connected with the filter screen and the filter screen is connected with the electrode filtering layer through bolts; the pressure control system comprises a control valve, a pressure gauge and a flow meter; the electrode drain pipe is of a hollow circular pipe type structure, and a drain hole is formed in the outer surface of the electrode drain pipe; the electrode filtering layer is of a double-sleeve circular tube structure, the inner sleeve and the outer sleeve are both of hollow structures, drain holes are formed in the surfaces of the inner sleeve and the outer sleeve, the inner sleeve and the outer sleeve are connected through a bolt support frame, and a filtering material is arranged in a cavity between the inner sleeve and the outer sleeve; a fixer is arranged at the joint of the electrode drainage system and the surface of the bottom plate in the water collecting pit, and a displacement sensor is arranged on the surface of the bottom plate in the water collecting pit; the construction method for pumping drainage and precipitation of the existing basement comprises the following steps:
step 1: testing the drainage flow by an electroosmosis method;
replacing a filter material in an electrode filter layer before each test, immersing an electrode drainage system in water, changing voltage by adopting a direct current power supply system, pumping water with different pressure and different flow, monitoring water flow in a pressure control system by adopting a flowmeter in the process, and acquiring a data set A of corresponding relation between the voltage, the pumped water pressure and the monitored water flow in an initial state;
step 2: testing pressure-controlled pumping drainage precipitation;
a control valve in the pressure control system and the electrode drainage system are kept in a closed state, when the pressure monitored by the pressure gauge is greater than or equal to a pressure relief early warning value, the control valve is opened, and a flowmeter is adopted to continuously monitor the water flow in the pressure control system; taking the water pressure and the design voltage of pumping drainage precipitation monitored by a pressure gauge at the moment of opening the control valve as references, and obtaining the reference water flow corresponding to the water pressure and the design voltage under the reference condition by referring to the data set A; if the initial water flow after the control valve is opened is greater than 80% of the reference water flow, keeping the existing state unchanged; if the initial water flow after the control valve is opened is less than 80% of the reference water flow, starting the direct current power supply system according to the design voltage, and changing the attributes of the cathode and the anode of the electrode at set intervals; if the pressure gauge is continuously smaller than the pressure relief early warning value, changing the attributes of the cathode and the anode of the electrode for 1 time within 7 d;
and step 3: testing the deformation controllability pumping drainage precipitation;
continuously monitoring the vertical displacement of the surface of the bottom plate in the sump by using a displacement sensor, and starting an electrode drainage system and increasing the voltage to 2-3 times of a design value when the vertical displacement monitored by the displacement sensor is greater than or equal to a deformation early warning value; when the vertical displacement monitored by the displacement sensor is greater than or equal to the deformation early warning value and the vertical displacement growth rate reaches the deformation rate warning value, the voltage of the electrode drainage system is increased to 3-5 times of the design value, and a booster pump is started to start active drainage construction operation;
and 4, step 4: automatic construction of drainage and precipitation;
the first mode is as follows: when the pressure monitored by the pressure gauge is smaller than the pressure relief early warning value and the vertical displacement monitored by the displacement sensor is smaller than the deformation early warning value, a control valve in the pressure control system keeps a closed state, and the electrode drainage system keeps a closed state;
and a second mode: when the pressure monitored by the pressure gauge is greater than or equal to the pressure relief early warning value and the vertical displacement monitored by the displacement sensor is smaller than the deformation early warning value, opening the control valve, and performing pumping drainage and precipitation according to the requirements of the pressure-controlled pumping drainage and precipitation test in the step 2;
and a third mode: when the vertical displacement monitored by the displacement sensor is greater than or equal to the deformation early warning value and no matter the pressure monitored by the pressure gauge is in any state, opening the control valve, starting the electrode drainage system, and performing drainage and precipitation according to the requirements of the deformation controllability drainage and precipitation test in the step 3;
the vertical displacement and the growth rate of the drainage structure monitored by the pressure gauge and the displacement sensor are freely switched according to the three modes of the automatic construction rule, so that the underground water is finally drained through the drainage system.
2. The construction method for pumping drainage and precipitation of the existing basement according to claim 1, wherein the pressure relief early warning value is 0.2MPa-0.5MPa, the deformation early warning value is 5mm-10mm, and the deformation rate warning value is 0.2mm/d-0.5mm/d.
3. The construction method for pumping drainage and precipitation of the existing basement according to claim 1, wherein the set time for changing the properties of the cathode and the anode of the electrode is 1d-3d.
4. The construction method for pumping drainage and precipitation of the existing basement according to claim 1, wherein when the vertical displacement monitored by the displacement sensor is greater than or equal to the deformation warning value and the vertical displacement growth rate reaches the deformation rate warning value, a plurality of drainage pipes are arranged on the inner surface of the pressure control system, high-pressure gas is sprayed into the drainage pipes through the drainage pipes, and the high-pressure gas is sprayed from the pressure control system towards the drainage system to generate a negative pressure effect to drive the underground water to be discharged in an accelerated manner.
5. The construction method for pumping and draining the water in the existing basement according to claim 1, wherein the designed voltage of the electrode drainage system is 32V-110V.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2014234681A (en) * | 2013-06-04 | 2014-12-15 | 株式会社大林組 | Ground-water level lowering system |
| CN110130406A (en) * | 2019-06-05 | 2019-08-16 | 福建特莱顿电渗透防水技术有限公司 | Electro-osmosis active waterproof system and waterproof method |
| CN110130375A (en) * | 2019-04-30 | 2019-08-16 | 江苏楼翔建设有限公司 | A kind of base pit dewatering device |
| CN111705824A (en) * | 2020-07-28 | 2020-09-25 | 孔维龙 | Automatic start and stop device for foundation pit dewatering |
| CN111827248A (en) * | 2020-03-26 | 2020-10-27 | 同济大学 | System and method for air bag expansion pressurization and vacuum-electroosmosis composite dewatering and dewatering in hole |
| CN112681351A (en) * | 2020-12-28 | 2021-04-20 | 济南轨道交通集团有限公司 | Foundation pit electroosmosis waterproof wall in water-rich area and construction method thereof |
| CN112900504A (en) * | 2021-01-13 | 2021-06-04 | 南京福欧地下空间数据科技有限公司 | Method and system for identifying water leakage of waterproof curtain of foundation pit |
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2021
- 2021-10-31 CN CN202111279187.XA patent/CN113944180B/en active Active
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| JP2014234681A (en) * | 2013-06-04 | 2014-12-15 | 株式会社大林組 | Ground-water level lowering system |
| CN110130375A (en) * | 2019-04-30 | 2019-08-16 | 江苏楼翔建设有限公司 | A kind of base pit dewatering device |
| CN110130406A (en) * | 2019-06-05 | 2019-08-16 | 福建特莱顿电渗透防水技术有限公司 | Electro-osmosis active waterproof system and waterproof method |
| CN111827248A (en) * | 2020-03-26 | 2020-10-27 | 同济大学 | System and method for air bag expansion pressurization and vacuum-electroosmosis composite dewatering and dewatering in hole |
| CN111705824A (en) * | 2020-07-28 | 2020-09-25 | 孔维龙 | Automatic start and stop device for foundation pit dewatering |
| CN112681351A (en) * | 2020-12-28 | 2021-04-20 | 济南轨道交通集团有限公司 | Foundation pit electroosmosis waterproof wall in water-rich area and construction method thereof |
| CN112900504A (en) * | 2021-01-13 | 2021-06-04 | 南京福欧地下空间数据科技有限公司 | Method and system for identifying water leakage of waterproof curtain of foundation pit |
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| CN113944180A (en) | 2022-01-18 |
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