CN112252346A - Construction method of dewatering well - Google Patents
Construction method of dewatering well Download PDFInfo
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- CN112252346A CN112252346A CN202010950736.0A CN202010950736A CN112252346A CN 112252346 A CN112252346 A CN 112252346A CN 202010950736 A CN202010950736 A CN 202010950736A CN 112252346 A CN112252346 A CN 112252346A
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
- F04B49/025—Stopping, starting, unloading or idling control by means of floats
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- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The application relates to a construction method of a precipitation well, relates to the field of foundation pit precipitation, and solves the technical problem that the existing precipitation well cannot timely reduce precipitation to influence construction, and the construction method comprises the following steps: s1, drilling; s2, lowering the well pipe; s3, washing the well; s4, installing a sewage pump, fixedly installing the sewage pump on the bottom surface of the fixed seat, and installing a floating ball liquid level switch for controlling the on-off of a sewage pump circuit on the bottom surface of the fixed seat; controlling the fixed seat to be lowered into the well pipe, and stopping lowering the fixed seat below the designed bottom elevation of the foundation pit; when the water level is higher than the bottom surface of the fixed seat, the floating ball liquid level switch controls the sewage pump circuit to be communicated, the sewage pump starts pumping water, and when the water level is lower than the water pumping port of the sewage pump, the floating ball liquid level switch controls the sewage pump circuit to be disconnected, and the sewage pump stops working; and S5, pumping water. This application is through the floater liquid level switch of setting in the precipitation well, monitors the water level in the precipitation well to can be according to opening and close of the height control sewage pump of water level.
Description
Technical Field
The application relates to the field of foundation pit dewatering, in particular to a construction method of a dewatering well.
Background
When the deep foundation pit engineering is excavated to a certain depth, pre-dewatering is carried out on underground water in advance, the existing underground water on the site is guaranteed not to influence earthwork excavation, the light well point and the pipe well dewatering are mainly used in the conventional dewatering mode, and the open drainage water pumping is assisted. And in the process of excavation of the foundation pit, opening the dewatering well in the corresponding area, and lowering the water level to 0.5-1.0m below the temporary excavation surface to ensure the earth excavation and the basement structure construction.
In the prior art, during excavation of a deep foundation pit, a dewatering well is unordered in starting and relatively lagged in management mode, whether the dewatering well is opened or not is determined according to the condition that constructors observe whether water leakage and water inrush occur on the side wall of the foundation pit, the bottom of the foundation pit and the bottom of a bearing platform or not and whether basement structure construction is influenced, and the control standards and the basis for definite quantification are not provided as to the number of dewatering wells to be opened and the starting time of a single-port dewatering well. Therefore, precipitation is not timely when the foundation pit precipitation on site occurs, so that precipitation work cannot meet the requirements of earth excavation and construction on site; or the water pump idles due to excessive precipitation and burns out the water pump.
Disclosure of Invention
The application provides a construction method of a precipitation well, which aims to solve the technical problems that precipitation is not timely and precipitation work cannot meet requirements of on-site earth excavation and construction.
The application provides a construction method of precipitation well, adopts following technical scheme:
a construction method of a dewatering well comprises the following steps:
s1, drilling;
s2, lowering the well pipe;
s3, washing the well;
s4, installing a sewage pump, fixedly installing the sewage pump on the bottom surface of the fixed seat, and installing a floating ball liquid level switch for controlling the on-off of a sewage pump circuit on the bottom surface of the fixed seat; controlling the fixed seat to be lowered into the well pipe, and stopping lowering the fixed seat below the designed bottom elevation of the foundation pit; when the water level is higher than the bottom surface of the fixed seat, the floating ball liquid level switch controls the sewage pump circuit to be communicated, the sewage pump starts pumping water, and when the water level is lower than the water pumping port of the sewage pump, the floating ball liquid level switch controls the sewage pump circuit to be disconnected, and the sewage pump stops working;
and S5, pumping water.
By adopting the technical scheme, the floating ball liquid level switch can monitor the water level in the dewatering well in real time by arranging the fixing seat and the floating ball liquid level switch, when the water level is higher than the control position of the floating ball liquid level switch, the floating ball liquid level switch controls the sewage pump circuit to be communicated, and the sewage pump pumps water in time, so that the problem that the dewatering of a foundation pit on site is not timely caused, and the dewatering work cannot meet the requirements of earth excavation and construction on site; when the water level is pumped to a position lower than the water pumping port of the sewage pump, the floating ball liquid level switch controls the sewage pump to be powered off, the sewage pump stops working, and the sewage pump is prevented from idling and burning.
Preferably, in step S4, before the fixing base is lowered, a lifting rope is connected to the center of the top surface of the fixing base, and the lifting rope controls the fixing base to be lowered into the well pipe.
Through adopting above-mentioned technical scheme, through transferring of lifting rope control fixing base, it is more convenient to the later stage is convenient for utilize the lifting rope to take out the fixing base from the precipitation well together with the sewage pump.
Preferably, after the fixing base is placed into the well pipe, the well cover is arranged at the well opening of the dewatering well in a covering mode, the well cover is fixedly provided with the fixed pulley, the fixed pulley is located on the central axis of the dewatering well, and the lifting rope penetrates out of the well cover and bypasses the fixed pulley.
Through adopting above-mentioned technical scheme, the well lid shields the well head of precipitation well, and the security during the construction is guaranteed, installs the fixed pulley on the other hand well lid, walks around the fixed pulley with the lifting rope, is convenient for turn to and control the lifting rope to through the fixed pulley control lifting rope and keep vertical state, thereby the vertical lift of control fixing base avoids transferring or when hoisting up the fixing base, the fixing base inlay card is in the well casing.
Preferably, in step S2, the well pipe comprises a plurality of sections of filter pipes below a design water level and a plurality of sections of pipes above the design water level; the well pipe mounting steps are as follows:
a1, installing a strainer, installing a lower base at the lower end of the first strainer, sealing the lower end of the strainer by the lower base, symmetrically connecting two first steel wire ropes to the lower base, inserting one end of the strainer, which is installed on the lower base, into a well hole downwards, and controlling the downward placement of the strainer by the first steel wire ropes; stopping the downward placement of the filter pipe when the upper end of the filter pipe is close to the well orifice, butting the next filter pipe, butting the lower end of the filter pipe to be placed with the upper end of the first filter pipe, continuously placing the filter pipe downward, and repeating the steps until the filter pipe is installed to the designed length;
a2, installing a pipeline, installing an upper base at the lower end of the first section of pipeline, wherein the upper end of the upper base is in socket connection with the pipeline, and the lower end of the upper base is in socket connection with the water filter pipe; two second steel wire ropes are symmetrically connected to the upper base, and the water filter pipes and the pipeline are controlled to be synchronously lowered through the first steel wire ropes and the second steel wire ropes; and when the pipeline is lowered to be close to the hole opening of the well, stopping lowering the water filter pipe and the pipeline, butting the next section of pipeline, and repeating the steps until the lowering of the pipeline is finished.
By adopting the technical scheme, when the water filter pipe is lowered, the water filter pipe is lowered and stopped through the first steel wire rope, and the lowering and stopping of the pipeline are controlled through the second steel wire rope, so that the water filter pipe and the pipeline can be conveniently assembled when the pipe is lowered; on the other hand, by arranging the lower base and the upper base, the well casing can be pulled out in a segmented mode during pipe pulling, so that the well casing can be pulled out conveniently and can be reused.
Preferably, after the filter pipe is arranged on the lower base, a filter screen is wrapped on the outer side wall of the filter pipe and hooped on the filter pipe, and then the filter pipe is placed downwards; when adjacent filter pipes are spliced, filter screens at the joints of the adjacent two sections of filter pipes are in lap joint fit.
By adopting the technical scheme, the filter screen has a filtering effect on underground water entering the well pipe, so that soil in a stratum is reduced from being pumped out along with water when water is pumped out, and soil loss is reduced.
Preferably, the outer surfaces of the filter screens of the two sections of butted filter pipes are provided with reinforcing strips, the reinforcing strips are positioned at the splicing positions of the two filter pipes and are arranged at intervals along the circumferential direction of the filter pipes, and the reinforcing strips are bound and fixed on the filter pipes.
Through adopting above-mentioned technical scheme, utilize to consolidate the strip and connect two sections strainer to consolidate the strip and increase the joint strength of two sections strainer knecks, when avoiding transferring the strainer, receive buoyancy to influence at the kneck and take place the bending because of the strainer.
Preferably, the method further comprises the step S6 of pulling out the pipe, pulling out the well pipe in sections after precipitation construction is finished, and gradually pulling out the pipeline on the upper part of the upper base by using the second steel wire rope to control the upper base; the lower base is controlled by the first steel wire rope to pull out the filter pipe on the upper part of the lower base.
By adopting the technical scheme, the well pipe is pulled out for recycling after precipitation is finished, so that the cost is saved; and the second steel wire rope is used for controlling the upper pipeline to be pulled out, the first steel wire rope is used for controlling the lower strainer to be pulled out, the well casing is pulled out in a segmented mode, pressure of the upper well casing and friction between the upper well casing and a well hole are reduced when the well casing is pulled out, and the well casing can be conveniently pulled out of the well hole.
Preferably, the wellbore is backfilled with a filler material after the well has been pulled out.
By adopting the technical scheme, on one hand, the well hole is backfilled, the safety of a construction site is ensured, and on the other hand, the integrity of the construction site is ensured.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the floating ball liquid level switch can monitor the water level in the dewatering well in real time by arranging the fixed seat and the floating ball liquid level switch, when the water level is higher than the control position of the floating ball liquid level switch, the floating ball liquid level switch controls the sewage pump circuit to be communicated, and the sewage pump pumps water in time, so that the problem that the dewatering is not timely caused in the dewatering of a foundation pit on site is avoided, and the dewatering work cannot meet the requirements of the earth excavation and construction on site; when the water level is pumped to a position lower than the water pumping port of the sewage pump, the floating ball liquid level switch controls the sewage pump to be powered off, the sewage pump stops working, and the sewage pump is prevented from idling and burning;
2. when the pipe is lowered, the first steel wire rope is used for controlling the lowering and stopping of the pipeline through the strainer pipe, and the second steel wire rope is used for controlling the lowering and stopping of the pipeline, so that the strainer pipe and the pipeline can be conveniently assembled during pipe lowering; on the other hand, by arranging the lower base and the upper base, the well casing can be pulled out in a segmented mode during pipe pulling, so that the well casing can be pulled out conveniently and can be reused.
Drawings
Fig. 1 is a schematic structural diagram of the present application.
Description of reference numerals: 1. a water filter pipe; 2. a pipeline; 3. a lower base; 4. a first wire rope; 5. an upper base; 6. a second wire rope; 7. a sewage pump; 8. a float ball liquid level switch; 9. a lifting rope; 10. a fixed pulley; 11. a wellbore.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
Referring to fig. 1, the embodiment of the application discloses a construction method of a dewatering well, which comprises the following steps:
s1, drilling:
and measuring the well placement positions according to the well placement diagram of the dewatering well, and properly adjusting the well placement positions when the well placement positions are influenced by ground obstacles or construction conditions.
A steel pile casing is buried underground, the lower end of the steel pile casing is inserted into an undisturbed soil layer, clay is applied outside the steel pile casing for sealing, and slurry return outside the steel pile casing during construction is prevented. And (4) installing a drilling machine, wherein the drilling machine is required to be installed stably and horizontally, and a drilling rod is aligned to the center of the well position. And then drilling to form a hole, wherein the hole is protected by slurry in the hole, the slurry sealing is controlled to be 1.10-1.15 in the drilling process, and when the drilling tool is lifted or stopped, the hole is filled with the slurry to prevent the hole wall from collapsing.
And after drilling to a designed elevation, cleaning the well hole 11, removing impurities in the well hole 11, and simultaneously gradually adjusting the density of slurry in the hole to 1.10, wherein the sediment of the bottom of the hole is less than 30cm until the returned slurry does not contain any sludge blocks.
S2, lowering the well pipe, measuring the hole depth before pipe lowering, and after the hole depth meets the design requirements, starting to install the well pipe into the well hole 11, and after the well pipe is lowered to the design depth, fixing and centering the well mouth. The well pipe comprises a plurality of sections of filter pipes 1 below the water level and a plurality of sections of pipelines 2 above the water level, the filter pipes 1 are sand-free concrete permeable pipes, and the pipelines 2 can be steel pipes, PE pipes and concrete pipes.
The installation of the strainer 1, install the lower base 3 in the first section strainer 1 inferior extremity, the lower base 3 is connected with the bell and spigot joint of the strainer 1, and the base seals the inferior extremity of the strainer 1; then, two layers of filter screens are wrapped on the outer side wall of the filter pipe 1, wherein the inner layer of the filter screen is 40 meshes, the outer layer of the filter screen is 18 meshes, and the filter screens are hooped on the outer side wall of the filter pipe 1 through hoops. Two first steel wire ropes 4 are symmetrically connected to the lower base 3, the strainer 1 is controlled by the first steel wire ropes 4, and one end of the strainer 1, which is mounted on the lower base 3, is inserted into the well hole 11 downwards. When the upper end of first section strainer 1 is close to 11 mouths in the wellhole, stop to transfer strainer 1, butt joint next section strainer 1, the lower extreme that will treat the strainer 1 of transferring docks with the upper end of first section strainer 1, the filter screen overlap joint cooperation of 1 kneck of two adjacent sections strainers, and set up the reinforcement strip that sets up along strainer 1 length direction at the filter screen surface of two sections strainers 1 that dock, the reinforcement strip evenly sets up five along the circumference interval of strainer 1, also can 4, the reinforcement strip passes through the iron wire ligature to be fixed on strainer 1, the reinforcement strip increases the stability of adjacent strainer 1 junction. Repeating the above steps until the drainpipe 1 is installed to a designed length.
The pipeline 2 is installed, the lower end of the first pipeline 2 is provided with an upper base 5, the upper end of the upper base 5 is connected with the pipeline 2 in a socket joint mode, the lower end of the upper base 5 is connected with the water filter pipe 1 in a socket joint mode, the upper base 5 is provided with through holes communicated with the pipeline 2 and the water filter pipe 1, and the upper base 5 is symmetrically connected with two second steel wire ropes 6. Second wire rope 6 control pipeline 2 transfers, transfers through first wire rope 4 and second wire rope 6 control strainer 1 and pipeline 2 and transfer in step, transfers to 2 upper ends of pipeline and is close to 11 mouths in the wellhole, stops to transfer strainer 1 and pipeline 2, docks next section pipeline 2, will wait to transfer the lower extreme of strainer 1 and the butt joint of the upper end of first section strainer 1, repeats above-mentioned step until pipeline 2 transfers the completion. After the pipe 2 is lowered, the pipe 2 is centered and fixed, and the ends of the first and second wire ropes 4 and 6 extending out of the borehole 11 are tightened and fixed.
S3, filling gravel materials, filling gravel filter materials between the well pipe and the wall of the well hole 11, wherein during filling, a loader is not required to be used for direct filling, shovel blanking is applied, the height difference between the gravel filter materials and the ground is not less than 1m, and clay is used for sealing and filling between the top surface of the gravel filter materials and the ground.
And S4, washing the well, pumping water by using a vacuum pump, and washing the well until clear water is pumped out. And the well washing is carried out within 8 hours after the well is finished, the filter material is filled and sealed.
S5, installing the sewage pump 7, firstly, fixedly installing the sewage pump 7 to the bottom surface of a fixed seat, and installing a floating ball liquid level switch 8 on the bottom surface of the fixed seat; a lifting rope 9 is connected to the middle position of the top surface of the fixed seat, and a through hole for the water pumping pipe on the sewage pump 7 to penetrate out is further formed in the fixed seat.
A well cover is covered at the well mouth of the precipitation well, a perforation is arranged on the well cover, and the water pumping pipe and the electric wire are led out from the precipitation well through the perforation; fixed mounting has fixed pulley 10 on the well lid, and fixed pulley 10 is located precipitation well's center axis, and lifting rope 9 wears out from the well lid and walks around fixed pulley 10 to make the fixing base can transfer perpendicularly, avoid the fixing base to transfer the in-process inlay card to the well intraductal.
And controlling the fixed seat to be lowered into the well pipe through the lifting rope 9, and stopping when the fixed seat is lowered to a position 50-100cm below the designed foundation pit bottom elevation. The floating ball liquid level switch 8 is used for controlling the opening and closing of the sewage pump 7, when the water level is higher than the bottom surface of the fixed seat, the floating ball liquid level switch 8 controls the opening and closing of the sewage pump 7, and the sewage pump 7 performs water pumping after being electrified; when the water level drops below the water pumping port of the sewage pump 7, the float liquid level switch 8 controls the switch of the sewage pump 7 to be closed, and the sewage pump 7 stops working. By arranging the fixing seat and the floating ball liquid level switch 8, the floating ball liquid level switch 8 can monitor the water level in the dewatering well in real time, when the water level is higher than the control position of the floating ball liquid level switch 8, the floating ball liquid level switch 8 controls the sewage pump 7 to be in circuit communication, and the sewage pump 7 pumps water in time, so that the problem that the dewatering of a foundation pit on site is not timely due to the fact that the dewatering work cannot meet the requirements of earth excavation and construction on site is avoided; when the water level is lower than the water pumping port of the sewage pump 7, the floating ball liquid level switch 8 controls the sewage pump 7 to be powered off, the sewage pump 7 stops working, and the sewage pump 7 is prevented from idling and burning the sewage pump 7.
And (4) draining, namely draining the water in the precipitation well into open channels around the construction site through a sewage pump 7, and draining the water into the municipal pipeline 2 through a drainage channel.
S6, pulling out the pipes, after the precipitation construction is finished and the sewage pump 7 is taken out, pulling out the well pipes in sections, specifically, firstly connecting a second steel wire rope 6 by using a crane or a chain block, and gradually pulling out the pipeline 2 on the upper part of the upper base 5 through the second steel wire rope 6 and the upper base 5; after the pipeline 2 is removed, the strainer 1 on the upper part of the lower base 3 is gradually pulled out through the first steel wire rope 4 and the lower base 3. The pipeline 2 and the strainer 1 are cleaned up after being pulled out for reuse, and a well hole 11 left after the well pipe is pulled out is filled with gravel and tamped.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The construction method of the dewatering well is characterized by comprising the following steps:
s1, drilling;
s2, lowering the well pipe;
s3, washing the well;
s4, installing a sewage pump (7), fixedly installing the sewage pump (7) on the bottom surface of the fixed seat, and installing a floating ball liquid level switch (8) for controlling the on-off of a circuit of the sewage pump (7) on the bottom surface of the fixed seat; controlling the fixed seat to be lowered into the well pipe, and stopping lowering the fixed seat below the designed bottom elevation of the foundation pit; when the water level is higher than the bottom surface of the fixed seat, the floating ball liquid level switch (8) controls the circuit of the sewage pump (7) to be communicated, the sewage pump (7) starts to pump water, when the water level is lower than the water pumping port of the sewage pump (7), the floating ball liquid level switch (8) controls the circuit of the sewage pump (7) to be disconnected, and the sewage pump (7) stops working;
and S5, pumping water.
2. The construction method of a dewatering well according to claim 1, characterized in that: in the step S4, before the fixed seat is lowered, a lifting rope (9) is connected to the center of the top surface of the fixed seat, and the lifting rope (9) controls the fixed seat to be lowered into the well pipe.
3. The construction method of a dewatering well as claimed in claim 2, wherein: after the fixing seat is placed into the well pipe, the well cover is arranged at the well opening of the dewatering well in a covering mode, the fixed pulley (10) is fixedly mounted on the well cover, the fixed pulley (10) is located on the central axis of the dewatering well, and the lifting rope (9) penetrates out of the well cover to pass through the fixed pulley (10).
4. The construction method of a dewatering well according to claim 1, characterized in that: in step S2, the well pipe comprises a plurality of sections of filter pipes (1) below a design water level and a plurality of sections of pipelines (2) above the design water level; the well pipe mounting steps are as follows:
a1, installing a strainer (1), installing a lower base (3) at the lower end of the first strainer (1), sealing the lower end of the strainer (1) by the lower base (3), symmetrically connecting two first steel wire ropes (4) on the lower base (3), inserting one end of the strainer (1) installed on the lower base (3) downwards into a well hole (11), and controlling the downward placement of the strainer (1) through the first steel wire ropes (4); when the upper end of the water filter pipe (1) is close to the hole (11), stopping lowering the water filter pipe (1), butting the next water filter pipe (1), butting the lower end of the water filter pipe (1) to be lowered with the upper end of the first water filter pipe (1), continuing to lower the water filter pipe (1), and repeating the steps until the water filter pipe (1) is installed to the designed length;
a2, installing a pipeline (2), installing an upper base (5) at the lower end of the first section of pipeline (2), wherein the upper end of the upper base (5) is in socket joint connection with the pipeline (2), and the lower end is in socket joint connection with the water filter pipe (1); two second steel wire ropes (6) are symmetrically connected to the upper base (5), and the water filter pipe (1) and the pipeline (2) are controlled to be synchronously lowered through the first steel wire ropes (4) and the second steel wire ropes (6); and when the pipeline (2) is lowered to be close to the opening of the well hole (11), stopping lowering the water filter pipe (1) and the pipeline (2), butting the next section of pipeline (2), and repeating the steps until the lowering of the pipeline (2) is completed.
5. The construction method of a dewatering well according to claim 4, characterized in that: after the filter pipe (1) is arranged on the lower base (3), a filter screen is wrapped on the outer side wall of the filter pipe (1) and hooped on the filter pipe (1), and then the filter pipe (1) is placed down; when the adjacent filter pipes (1) are spliced, the filter screens at the joints of the adjacent two sections of the filter pipes (1) are in lap joint fit.
6. The construction method of a dewatering well according to claim 5, characterized in that: the outer surfaces of filter screens of two sections of butted water filter pipes (1) are provided with reinforcing strips, the reinforcing strips are positioned at the splicing positions of the two water filter pipes (1) and are arranged at intervals along the circumferential direction of the water filter pipes (1), and the reinforcing strips are bound and fixed on the water filter pipes (1).
7. The construction method of a dewatering well according to claim 1, characterized in that: step S6, pulling out the pipe, after precipitation construction, pulling out the well pipe in sections, and firstly using a second steel wire rope (6) to control the upper base (5) to gradually pull out the pipeline (2) on the upper part of the upper base (5); the lower base (3) is controlled by a first steel wire rope (4) to pull out the filter pipe (1) on the upper part of the lower base (3).
8. The construction method of a dewatering well as claimed in claim 7, wherein: after the well casing is pulled out, the borehole (11) is backfilled with a filler material.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113605429A (en) * | 2021-08-11 | 2021-11-05 | 惠州市惠阳区第二建筑工程有限公司 | Construction process of dewatering well |
| CN115094929A (en) * | 2022-07-07 | 2022-09-23 | 中煤长江基础建设有限公司 | Pipe well dewatering and drainage equipment and drainage method thereof |
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