CN216892481U - Take precipitation well shutoff construction structures of forced water - Google Patents
Take precipitation well shutoff construction structures of forced water Download PDFInfo
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- CN216892481U CN216892481U CN202220607046.XU CN202220607046U CN216892481U CN 216892481 U CN216892481 U CN 216892481U CN 202220607046 U CN202220607046 U CN 202220607046U CN 216892481 U CN216892481 U CN 216892481U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a plugging construction structure of a dewatering well with strong pressurized water, which comprises a water-absorbing hot-melting pipe inserted in the dewatering well with strong pressurized water, an in-pipe plugging structure backfilled in the water-absorbing hot-melting pipe, an annular plugging structure backfilled between the dewatering well and the water-absorbing hot-melting pipe, and a top plugging structure arranged at the top of the water-absorbing hot-melting pipe, wherein the annular plugging structure comprises a plurality of annular plugging structures and a plurality of annular plugging structures; the bottom of the water absorption hot melting pipe is provided with an open hole section pipe section. According to the utility model, the water absorption hot melting pipe is arranged in the dewatering well, so that underground water in the dewatering well is absorbed and discharged, the water burst pressure is reduced, and underground strong pressure water is isolated outside the annular plugging area, so that backfill plugging of the annular plugging area is not influenced by the underground strong pressure water burst, the stability of a plugging structure in the annular plugging area is ensured, the inner diameter of the dewatering well is reduced, the plugging difficulty of the dewatering well is reduced, and the well plugging success rate is improved.
Description
Technical Field
The utility model belongs to the technical field of dewatering well plugging, and particularly relates to a dewatering well plugging construction structure with strong pressure water.
Background
In the stratum with confined water, in order to prevent the instability problems such as flowing soil and sudden gushing at the bottom of the foundation pit in the excavation process, a dewatering well is often arranged in a confined water layer to reduce the confined water level so as to ensure the safety of the foundation pit. After the foundation pit is excavated, the dewatering needs to be stopped, and the dewatering well of the confined water layer needs to be plugged, so that the problem of how to effectively plug the dewatering well of the confined water layer is a great problem because the confined water layer has rich water content, high water head pressure and large flow. The conventional plugging method for the dewatering well is that after dewatering is stopped, a water inrush head is pressed by a multilayer waterproof device or by coarse sand, clay balls, dry cement and the like through back pressure, and due to the large head pressure of confined water, abundant water quantity and the like, the dewatering well is difficult to be plugged in a water-free environment, so that plugging failure is easily caused, and the re-plugging construction is complex, high in cost and long in construction period; in addition, the number of dewatering wells in the ultra-deep subway station is large, the pressure bearing inside and outside the station structure is large after the station structure is closed, the construction space is narrow, large equipment is inconvenient to use, and the ultra-deep subway station cannot be plugged by adopting a common plugging method; therefore, a need exists for a plugging construction structure suitable for a precipitation well group with strong pressure water, so as to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the defects in the prior art are overcome, and the dewatering well plugging construction structure with high-pressure water is provided, which is simple in structure, reasonable in design and high in practicability.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: the utility model provides a take precipitation well shutoff construction structures of forced water, precipitation well top is provided with the bottom plate sleeve pipe, its characterized in that: the dewatering well plugging construction structure comprises a water absorption hot melting pipe inserted in a dewatering well with strong pressure water, an in-pipe plugging structure backfilled in the water absorption hot melting pipe, an annular plugging structure backfilled between the dewatering well and the water absorption hot melting pipe, and a top plugging structure arranged at the top of the water absorption hot melting pipe; the bottom of the water absorption hot melting pipe is provided with an open hole section pipe section;
the annular plugging structure comprises an annular gravel base layer, a cement leveling layer and a concrete backfill layer which are sequentially backfilled from bottom to top, the top of the annular gravel base layer is flush with the top of the perforated section pipe section, and the thickness of the cement leveling layer is less than or equal to 1/4 of the thickness of the annular gravel base layer; the top of the concrete backfill layer is flush with the top of the sleeve pipe passing through the bottom plate; the in-pipe blocking structure comprises an expansion water stop layer and a cement pipe sealing layer which are backfilled from bottom to top in sequence, and the top of the cement pipe sealing layer is flush with the top of the water absorption hot melting pipe; the top plugging structure comprises a welding sealing steel plate welded at the top of the over-bottom plate sleeve and a bottom plate filling layer backfilled on the periphery of the over-bottom plate sleeve, and the top of the bottom plate filling layer is flush with the upper surface of the bottom plate.
Foretell precipitation well shutoff construction structures of area pressurized water, its characterized in that: the outer diameter of the water absorption hot melting pipe is 1/6-1/5 of the inner diameter of the dewatering well.
Foretell precipitation well shutoff construction structures of area pressurized water, its characterized in that: the length of the open hole section pipe section is 1/4L-1/3L, wherein L is the well depth of the dewatering well currently performing plugging operation.
Foretell precipitation well shutoff construction structures of area pressurized water, its characterized in that: the bottom and the outer side of the open section pipe section are wrapped by filter screens.
Foretell precipitation well shutoff construction structures of area pressurized water, its characterized in that: the annular gravel base layer is a hard round gravel layer with the particle size of 4-15 mm.
Foretell precipitation well shutoff construction structures of area pressurized water, its characterized in that: the height ratio of the expansion water-stop layer to the cement pipe sealing layer is 1: 2.
Compared with the prior art, the utility model has the following advantages: the water absorption hot melting pipe is arranged in the dewatering well, so that underground water in the dewatering well is absorbed and discharged, water burst pressure is reduced, and underground strong pressure water is isolated outside the annular plugging area, so that backfill plugging of the annular plugging area is not influenced by the underground strong pressure water burst, the stability of a plugging structure in the annular plugging area is ensured, the inner diameter of the dewatering well is reduced, the plugging difficulty of the dewatering well is reduced, and the well plugging success rate is improved.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a construction state diagram of the present invention.
Description of reference numerals:
3-dewatering well; 7-water absorption hot melting pipe; 8-a self-priming water pump; 10-a perforated section pipe section; 11-an annular crushed stone base layer; 12-a cement screed layer; 13-passing the bottom plate sleeve; 14-a concrete backfill layer; 15-swelling water-stopping layer; 16-cement pipe sealing layer; 17-sealing steel plate; 18-a floor fill layer; 19-bottom plate.
Detailed Description
As shown in figure 1, the utility model comprises a water-absorbing hot-melting pipe 7 inserted in a precipitation well 3 with strong pressure water, an in-pipe plugging structure backfilled in the water-absorbing hot-melting pipe 7, an annular plugging structure backfilled between the precipitation well 3 and the water-absorbing hot-melting pipe 7, and a top plugging structure arranged at the top of the water-absorbing hot-melting pipe 7; the bottom of the water absorption hot melting pipe 7 is provided with an open hole section pipe section 10;
the annular plugging structure comprises an annular gravel base layer 11, a cement leveling layer 12 and a concrete backfill layer 14 which are backfilled from bottom to top in sequence, the top of the annular gravel base layer 11 is flush with the top of the perforated section pipe section 10, and the thickness of the cement leveling layer 12 is smaller than or equal to 1/4 of the thickness of the annular gravel base layer 11; the top of the concrete backfill layer 14 is flush with the top of the through-floor sleeve 13; the in-pipe blocking structure comprises an expansion water stop layer 15 and a cement pipe sealing layer 16 which are backfilled from bottom to top in sequence, and the top of the cement pipe sealing layer 16 is flush with the top of the water absorption hot melting pipe 7; the top plugging structure comprises a welding sealing steel plate 17 welded at the top of the over-bottom plate sleeve 13 and a bottom plate filling layer 18 backfilled on the peripheral side of the over-bottom plate sleeve 13, and the top of the bottom plate filling layer 18 is flush with the upper surface of a bottom plate 19.
It should be noted that, by arranging the water-absorbing hot-melting pipe 7, the groundwater in the dewatering well 3 is continuously absorbed and discharged when the annular plugging area is backfilled and plugged, the water burst pressure intensity is reduced, and the water discharge power is improved, so that the backfilling and plugging of the annular plugging area are not influenced by the groundwater gushing under strong pressure, and the stability of a plugging structure in the annular plugging area is ensured;
through set up the hot melt pipe 7 that absorbs water in precipitation well 3, make and form annular shutoff district between precipitation well 3 inner wall and the hot melt pipe 7 outer wall that absorbs water, keep apart the underground strong pressure water outside annular shutoff district, be equivalent to reduced the internal diameter of precipitation well 3, reduced the shutoff degree of difficulty of precipitation well 3, excellent in use effect.
In this embodiment, the outer diameter of the water-absorbing thermal fusion pipe 7 is 1/6-1/5 of the inner diameter of the dewatering well 3.
It should be noted that the external diameter of the water-absorbing thermal fusion pipe 7 is too small to pump and discharge underground water burst in time, and too large to ensure the stability of the annular backfill structure backfilled in advance.
In this embodiment, the length of the pipe section 10 at the open hole section is 1/4L-1/3L, where L is the well depth of the dewatering well 3 currently performing the plugging operation.
In this embodiment, the bottom and the outer side of the perforated section 10 are wrapped with filter screens.
It should be noted that the filter screen is used for preventing impurities in the underground water from entering the water-absorbing hot-melting pipe 7, so that the blockage of the self-sucking water pump 8 is avoided, and the long-time continuous water sucking and draining operation of the self-sucking water pump 8 is guaranteed.
In this embodiment, the annular gravel base layer 11 is a hard round gravel layer with a particle size of 4mm to 15 mm.
It should be noted that, the crushed stone needs to be screened before the crushed stone is backfilled, so that flaky and needle-shaped stone chips are avoided from appearing in the crushed stone, the phenomenon of gravel bridging in holes due to too high or uneven filling speed is avoided, and normal water absorption and drainage are ensured.
In this embodiment, the height ratio of the swelling waterproof layer 15 to the cement pipe sealing layer 16 is 1: 2.
It should be noted that, the water swelling and water stopping glue needs to be rapidly filled into the water absorption hot melt pipe 7 within two minutes, and the thin steel bar is used for vibrating, so that the compactness of the swelling and water stopping layer 15 is ensured, the first water stopping structure in the water absorption hot melt pipe 7 is formed, then, cement is adopted for backfilling, the swelling and water stopping layer 15 can prevent the forced water from continuously upwelling, the time is strived for the shaping and solidification of the cement pipe sealing layer 16, and the water stopping effect and the structural stability of the cement pipe sealing layer 16 as the second water stopping structure are ensured.
As shown in fig. 2, the method of the present invention comprises the following steps:
s1, inserting a water absorption hot melt pipe 7 into the precipitation well 3, wherein the bottom of the water absorption hot melt pipe 7 is abutted against the bottom of the precipitation well 3, the top of the water absorption hot melt pipe 7 is connected with a self-priming water pump 8,
in the embodiment, the water absorption hot melt pipe 7 is formed by splicing a plurality of hot melt pipes, the splicing seams can not leak water due to the characteristics of the hot melt pipes, and the hot melt pipes are light in self weight and convenient to carry, move and transport; in addition, before the pipe is actually used, whether the surface of the pipe is knocked, bumped or scratched is checked, if the depth of a flaw exceeds 10% of the wall thickness of the pipe, the pipe can be used after being partially cut.
S2, starting a self-priming water pump 8, and pumping the water surface height in the dewatering well 3 to be below the top of the perforated section pipe section 10;
in this embodiment, self priming pump 8's pumping volume is greater than the water inflow of precipitation well 3, and consequently, is preferred, self priming pump 8 adopts the self priming pump of three-phase 2.5kw, and the self priming pump 8 of this model is small, and portable is applicable to the use in the narrow and small operation space in 1 closed back of ultra-deep subway station.
S3, uniformly backfilling crushed stones into the bottom of the annular plugging area to form an annular crushed stone base layer 11 for stabilizing the bottom of the water absorption hot melting pipe 7, wherein the thickness of the annular crushed stone base layer 11 is not more than half of the length of the perforated section pipe section 10;
adjusting the position of the water absorption hot melt pipe 7 in the precipitation well 3 to ensure that the axis of the water absorption hot melt pipe 7 is superposed with the axis of the precipitation well 3;
continuously backfilling broken stones into the annular plugging area uniformly to enable the top of the annular broken stone base layer 11 to be increased until the top of the annular broken stone base layer 11 is flush with the top of the perforated section pipe section 10;
it should be noted that, in step S3, the self-priming water pump 8 continuously sucks and discharges water to make the outside of the perforated section pipe section 10 have a small negative pressure, and the backfilled gravel is sunk into the bottom of the precipitation well 3 and then is impacted by the strong pressure water rushing into the precipitation well 3, so as to have the function of vibrating the gravel, and the outside of the perforated section pipe section 10 sucks and fixes the gravel due to the water sucking function, so that the gravel can be stabilized to form an annular gravel base layer 11, and the inner gap of the annular gravel base layer 11 is prevented from being too large, thereby ensuring the stability of the pipe bottom of the water-sucking hot-melting pipe 7, preventing the water-sucking hot-melting pipe 7 from swinging when the annular plugging area is backfilled and plugged subsequently, and ensuring the stability of the plugging structure in the annular plugging area;
the annular gravel base layer 11 is backfilled twice, the position of the water-absorbing hot-melting pipe 7 in the dewatering well 3 is adjusted between the backfilling twice, the axis of the water-absorbing hot-melting pipe 7 is overlapped with the axis of the dewatering well 3, the annular width of the annular plugging area is uniform, the subsequent micro-expansion concrete solidification time is uniform, and the condition that one section of micro-expansion concrete is not solidified after the other section of micro-expansion concrete is solidified is avoided, so that the stability of the plugging structure in the annular plugging area is ensured;
s4, uniformly backfilling cement into the annular plugging area, and forming a cement leveling layer 12 on the top of the annular gravel base layer 11;
it should be noted that the purpose of the backfill cement leveling layer 12 is to avoid the backfill concrete segregation caused by the large gap above the annular gravel base layer 11.
S5, uniformly backfilling the micro-expansion concrete into the annular plugging area until the micro-expansion concrete is backfilled into the bottom plate passing casing 13 at the top of the dewatering well 3 to form a concrete backfill layer 14, wherein the top of the concrete backfill layer 14 is flush with the top of the bottom plate passing casing 13;
in the embodiment, the micro-expansion concrete is micro-expansion C35p10 concrete;
it should be noted that, when the micro-expansive concrete is backfilled, vibration needs to be enhanced to ensure that the structure of the concrete backfill layer 14 is compact.
S6, continuously pumping and draining water by the self-priming water pump 8, keeping the water surface height in the dewatering well 3 below the top of the annular gravel base layer 11, and waiting for the concrete backfill layer 14 to be solidified and formed;
it should be noted that, when the well sealing material is sealed and filled in the annular sealing area, the water absorption hot melting pipe 7 continuously pumps and drains water, so that the well sealing material in the annular sealing area cannot contact strong pressure water flowing downwards except the annular gravel base layer 11, and the concrete backfill layer 14 is formed by one-step pouring, so that the construction efficiency is high; and a plurality of precipitation wells 3 in one precipitation well group synchronously carry out plugging operation, and the concrete backfill layers 14 in the plurality of precipitation wells 3 synchronously wait for solidification and forming, so that the construction efficiency is extremely high, the labor demand is low, and the construction cost is favorably reduced.
S7, after the concrete backfill layer 14 is solidified and formed, stopping the self-priming water pump 8, disconnecting the connection between the water-absorbing hot-melting tube 7 and the self-priming water pump 8, cutting off the part of the top of the water-absorbing hot-melting tube 7, which is higher than the bottom plate sleeve 13, and rapidly filling water-swelling water-stopping glue and cement into the water-absorbing hot-melting tube 7 in sequence, wherein the water-swelling water-stopping glue forms a swelling water-stopping layer 15, and the cement filled in the water-absorbing hot-melting tube 7 forms a cement seal tube layer 16; the top of the cement pipe sealing layer 16 is flush with the top of the water absorption hot melt pipe 7;
it should be noted that, the water-absorbing hot-melting pipe 7 has a faster cutting speed than pipes such as steel pipes, so that the underground water is prevented from flowing out of the water-absorbing hot-melting pipe 7, more time is provided for filling the water-swelling water-stopping adhesive, and the water-stopping effect is improved.
S8, welding a sealing steel plate 17 on the top of the through-bottom-plate sleeve 13, and backfilling concrete on the peripheral side of the through-bottom-plate sleeve 13 to form a bottom-plate filling layer 18, wherein the top of the bottom-plate filling layer 18 is flush with the bottom plate 19;
in this embodiment, the type of the concrete used in step S8 is the same as the type of the concrete of the bottom plate 19, and after the backfilling is completed, the upper surface of the bottom plate 19 is flat, clean and beautiful.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (6)
1. The utility model provides a take precipitation well shutoff construction structures of forced water, precipitation well (3) top is provided with bottom plate sleeve pipe (13), its characterized in that: the dewatering well plugging construction structure comprises a water absorption hot melting pipe (7) inserted in a dewatering well (3) with strong pressure water, an in-pipe plugging structure backfilled in the water absorption hot melting pipe (7), an annular plugging structure backfilled between the dewatering well (3) and the water absorption hot melting pipe (7), and a top plugging structure arranged at the top of the water absorption hot melting pipe (7); the bottom of the water absorption hot melting pipe (7) is provided with an open hole section pipe section (10);
the annular plugging structure comprises an annular gravel base layer (11), a cement leveling layer (12) and a concrete backfill layer (14) which are backfilled from bottom to top in sequence, the top of the annular gravel base layer (11) is flush with the top of the perforated section pipe section (10), and the thickness of the cement leveling layer (12) is less than or equal to 1/4 of the thickness of the annular gravel base layer (11); the top of the concrete backfill layer (14) is flush with the top of the through-bottom plate sleeve (13); the in-pipe blocking structure comprises an expansion water stop layer (15) and a cement pipe sealing layer (16) which are backfilled from bottom to top in sequence, and the top of the cement pipe sealing layer (16) is flush with the top of the water absorption hot melting pipe (7); the top plugging structure comprises a welding sealing steel plate (17) welded at the top of the over-bottom-plate sleeve (13) and a bottom-plate filling layer (18) backfilled on the peripheral side of the over-bottom-plate sleeve (13), and the top of the bottom-plate filling layer (18) is flush with the upper surface of the bottom plate (19).
2. The dewatering well plugging construction structure with the forced water as claimed in claim 1, characterized in that: the outer diameter of the water absorption hot melting pipe (7) is 1/6-1/5 of the inner diameter of the dewatering well (3).
3. The dewatering well plugging construction structure with the forced water as claimed in claim 1, characterized in that: the length of the open hole section pipe section (10) is 1/4L-1/3L, wherein L is the well depth of the dewatering well (3) which is currently subjected to plugging operation.
4. The dewatering well plugging construction structure with the forced water as claimed in claim 1, characterized in that: the bottom and the outer side of the open section pipe section (10) are wrapped by filter screens.
5. The dewatering well plugging construction structure with the forced water as claimed in claim 1, characterized in that: the annular gravel base layer (11) is a hard round gravel layer with the grain diameter of 4-15 mm.
6. The dewatering well plugging construction structure with the forced water as claimed in claim 1, characterized in that: the height ratio of the expansion water-stopping layer (15) to the cement pipe sealing layer (16) is 1: 2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220607046.XU CN216892481U (en) | 2022-03-18 | 2022-03-18 | Take precipitation well shutoff construction structures of forced water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220607046.XU CN216892481U (en) | 2022-03-18 | 2022-03-18 | Take precipitation well shutoff construction structures of forced water |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116163326A (en) * | 2023-02-17 | 2023-05-26 | 中建五局土木工程有限公司 | The plugging structure of dewatering wells used in highly pressurized water-rich strata |
| CN116641407A (en) * | 2023-01-04 | 2023-08-25 | 中铁隧道局集团有限公司北京分公司 | A plugging construction technology for dewatering wells in water-rich formations prone to piping along the river |
| CN120100479A (en) * | 2025-05-07 | 2025-06-06 | 矿冶科技集团有限公司 | Well blocking structure and construction method of blocking structure |
-
2022
- 2022-03-18 CN CN202220607046.XU patent/CN216892481U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116641407A (en) * | 2023-01-04 | 2023-08-25 | 中铁隧道局集团有限公司北京分公司 | A plugging construction technology for dewatering wells in water-rich formations prone to piping along the river |
| CN116163326A (en) * | 2023-02-17 | 2023-05-26 | 中建五局土木工程有限公司 | The plugging structure of dewatering wells used in highly pressurized water-rich strata |
| CN120100479A (en) * | 2025-05-07 | 2025-06-06 | 矿冶科技集团有限公司 | Well blocking structure and construction method of blocking structure |
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