CN114482105B - Precipitation well group plugging construction method with strong pressurized water after ultra-deep subway station is closed - Google Patents
Precipitation well group plugging construction method with strong pressurized water after ultra-deep subway station is closed Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 156
- 238000001556 precipitation Methods 0.000 title claims abstract description 85
- 238000010276 construction Methods 0.000 title claims abstract description 52
- 238000002844 melting Methods 0.000 claims abstract description 83
- 238000007789 sealing Methods 0.000 claims abstract description 29
- 238000010521 absorption reaction Methods 0.000 claims abstract description 11
- 239000012943 hotmelt Substances 0.000 claims description 38
- 239000004568 cement Substances 0.000 claims description 35
- 239000004575 stone Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 19
- 238000005086 pumping Methods 0.000 claims description 15
- 230000000903 blocking effect Effects 0.000 claims description 12
- 238000007711 solidification Methods 0.000 claims description 12
- 230000008023 solidification Effects 0.000 claims description 12
- 239000011148 porous material Substances 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 239000003292 glue Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 230000008961 swelling Effects 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
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- E02D19/10—Restraining of underground water by lowering level of ground water
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Abstract
The invention discloses a construction method for plugging a precipitation well group with strong water after an ultra-deep subway station is sealed, which comprises the following steps: 1. determining the plugging sequence of a precipitation well group; 2. plugging of an initial plugging group; 3. plugging of the middle plugging group; 4. and increasing the water absorption and drainage amount of the dewatering well in the final plugging group, and plugging the final plugging group. According to the invention, the plugging sequences of the plurality of dewatering well groups are arranged, the dewatering well groups in one construction section are used as a plugging unit for plugging, so that the water pressure in the well during plugging operation of the final plugging group is reduced, and the well plugging difficulty of the final plugging group is reduced; in addition, the water-absorbing hot-melting pipe is arranged in the dewatering well, so that a plugging area is formed between the inner wall of the dewatering well and the outer wall of the water-absorbing hot-melting pipe, underground strong-pressure water is isolated outside the plugging area, the inner diameter of the dewatering well is reduced, the plugging difficulty of the dewatering well is reduced, and the well sealing success rate is improved.
Description
Technical Field
The invention belongs to the technical field of dewatering well plugging, and particularly relates to a construction method for plugging a dewatering well group with strong pressurized water after a super-deep subway station is sealed.
Background
In a stratum with pressure-bearing water, in order to prevent instability problems such as soil flowing and sudden surges at the bottom of a foundation pit in the process of excavation, a dewatering well is arranged in the pressure-bearing water layer so as to reduce the pressure-bearing water level, so that the safety of the foundation pit is ensured. After the foundation pit is excavated, the dewatering is stopped, and the dewatering well of the bearing water layer is plugged, so that the plugging of the dewatering well of the bearing water layer is a great difficulty due to the fact that the bearing water layer is rich in water content, high in water head pressure and large in flow. The conventional dewatering well plugging method is that after dewatering is stopped, a water inflow water head is pressed by a multilayer waterproof device or coarse sand, clay balls, dry cement and the like through back pressure, so that the dewatering well is difficult to plug in a non-water environment due to the fact that the water head pressure of the pressure-bearing water is high, the water quantity is rich and the like, plugging failure is easy to cause, and re-plugging construction is complex, cost is high and construction period is long.
In addition, the number of precipitation wells in the ultra-deep subway station is large, the internal and external pressure bearing is large after the station structure is closed, the construction space is narrow, large-scale equipment is inconvenient to use, and the common plugging method cannot be suitable for plugging of the ultra-deep station; when the ultra-deep subway station precipitation well group is plugged by adopting a conventional method, the following conditions can occur: after the dewatering well pump is stopped, groundwater begins to flow out from the well mouth in a large amount about 2 minutes, and the concrete slurry is continuously flushed out in a large amount due to excessive water pressure, so that the concrete solidification is affected, and the plugging effect is poor; each dewatering well on site can cause the increase of the water inflow and pressure of the residual non-blocked dewatering well, and the subsequent difficulty of well sealing is continuously increased, so that the well sealing cost is continuously increased. Therefore, a construction method for plugging a precipitation well group with strong water after sealing an ultra-deep subway station is needed to solve the problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a construction method for plugging a precipitation well group with strong water after the ultra-deep subway station is closed, wherein the plugging sequence of a plurality of precipitation well groups is arranged, the precipitation well groups in one construction section are used as a plugging unit for plugging, the water pressure in the well during plugging operation of the final plugging group is reduced, and the well plugging difficulty of the final plugging group is reduced; in addition, the water-absorbing hot-melting pipe is arranged in the dewatering well, so that a plugging area is formed between the inner wall of the dewatering well and the outer wall of the water-absorbing hot-melting pipe, underground strong-pressure water is isolated outside the plugging area, the inner diameter of the dewatering well is reduced, the plugging difficulty of the dewatering well is reduced, and the well sealing success rate is improved.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a construction method is plugged to precipitation well group of super dark subway station back area strong pressure water, a plurality of construction section have been distributed along its length direction in the super dark subway station, all have a precipitation well group in every construction section, one precipitation well group includes a plurality of precipitation wells of taking strong pressure water, the top of precipitation well is provided with the cross bottom plate sleeve pipe, all precipitation wells in the super dark subway station constitute precipitation well group, its characterized in that, this method includes:
step one, determining the plugging sequence of a precipitation well group:
if the average depth of the dewatering wells in one dewatering well group is larger than the average depth of all the dewatering wells, the dewatering well group is marked as an initial plugging group; the number of the initial plugging groups is multiple, and the plugging sequences of the multiple initial plugging groups are sequentially arranged from large to small according to the average depth of the dewatering well corresponding to the initial plugging groups;
when only one precipitation well group with the minimum average depth of the precipitation wells is provided, the precipitation well group with the minimum average depth is a final plugging group; when the average depth of the dewatering wells in the dewatering well groups is the smallest and the dewatering well groups with the smallest average depth are multiple, the dewatering well group with the smallest average depth, which is closest to the large mileage end of the ultra-deep subway station, in the plurality of dewatering well groups with the smallest average depth is recorded as a final plugging group;
recording the precipitation well groups except the initial plugging group and the final plugging group as an intermediate plugging group; the number of the middle plugging groups is multiple, and the middle plugging groups sequentially plug from the small mileage end of the ultra-deep subway station to the large mileage end of the ultra-deep subway station;
step two, plugging of an initial plugging group:
simultaneously plugging a plurality of dewatering wells in an initial plugging group, and plugging any dewatering well in the initial plugging group, wherein the specific process is as follows:
s1, inserting a water-absorbing hot-melting pipe into a precipitation well, forming a first plugging area between the inner wall of the precipitation well and the outer wall of the water-absorbing hot-melting pipe, abutting the bottom of the water-absorbing hot-melting pipe with the bottom of the precipitation well, connecting the top of the water-absorbing hot-melting pipe with a self-priming water pump, and uniformly providing a plurality of water-absorbing holes on the lower pipe section of the water-absorbing hot-melting pipe; recording a pipe section provided with a water absorption hole on the water absorption hot melting pipe as an open-pore section pipe section; the length of the pipe section of the open hole section is not more than 1/3L, wherein L is the well depth of a precipitation well currently subjected to plugging operation;
s2, starting a self-priming water pump, and pumping and discharging the water surface height in the dewatering well below the top of the pipe section of the open pore section;
s3, uniformly backfilling gravels into the bottom of the first plugging area to form an annular gravels base layer, wherein the annular gravels base layer is used for stabilizing the bottom of the water-absorbing hot-melt pipe, and the thickness of the annular gravels base layer is not more than half of the length of the pipe section of the open pore section;
the position of the water-absorbing hot-melting pipe in the dewatering well is adjusted to enable the axis of the water-absorbing hot-melting pipe to coincide with the axis of the dewatering well;
continuously and uniformly backfilling crushed stone into the first plugging area to increase the top of the annular crushed stone base layer until the top of the annular crushed stone base layer is flush with the top of the pipe section of the open pore section;
s4, uniformly backfilling cement into the first plugging area, and forming a cement leveling layer on the top of the annular broken stone base layer, wherein the thickness of the cement leveling layer is less than or equal to 1/4 of the thickness of the annular broken stone base layer;
s5, uniformly backfilling micro-expansion concrete into the first plugging area until the micro-expansion concrete is backfilled into the bottom plate sleeve at the top of the dewatering well to form a concrete backfill layer, wherein the top of the concrete backfill layer is flush with the top of the bottom plate sleeve;
s6, continuously pumping and draining water from the self-priming water pump, so that the water surface height in the dewatering well is kept below the top of the annular gravel base layer, and waiting for solidification and molding of the concrete backfill layer;
s7, after the concrete backfill layer is solidified and formed, the self-priming water pump is turned off, the connection between the water-absorbing hot-melting pipe and the self-priming water pump is disconnected, the part, higher than the sleeve of the through-bottom plate, of the top of the water-absorbing hot-melting pipe is cut off, water-swelling water-stop glue and cement are filled into the water-absorbing hot-melting pipe in sequence, the water-swelling water-stop glue forms a swelling water-stop layer, and the cement backfilled in the water-absorbing hot-melting pipe forms a cement pipe-sealing layer; the top of the cement sealing pipe layer is flush with the top of the water-absorbing hot melting pipe;
s8, welding a sealing steel plate on the top of the over-bottom plate sleeve, backfilling concrete on the peripheral side of the over-bottom plate sleeve to form a bottom plate filling layer, wherein the top of the bottom plate filling layer is flush with the bottom plate;
step three, plugging of the middle plugging group:
sequentially plugging a plurality of middle plugging groups from a small mileage end of the ultra-deep subway station to a large mileage end of the ultra-deep subway station; simultaneously plugging a plurality of dewatering wells in any intermediate plugging group, wherein the specific process is the same as that of the steps S1 to S8;
and step four, enlarging the water absorption and drainage amount of the dewatering well in the final plugging group, and plugging the final plugging group.
The construction method for plugging the precipitation well group with the strong pressurized water after the ultra-deep subway station is sealed is characterized by comprising the following steps of: the specific process of the fourth step is as follows:
simultaneously plugging a plurality of dewatering wells in the final plugging group, and plugging any dewatering well in the final plugging group, wherein the specific process is as follows:
step 401, inserting two water-absorbing hot-melting pipes which are bound and fixed together into a precipitation well, wherein water stop valves are arranged on the two water-absorbing hot-melting pipes which are bound and fixed together, the tops of the two water-absorbing hot-melting pipes are respectively connected with two self-priming water pumps, and a second plugging area is arranged between the two water-absorbing hot-melting pipes which are bound and fixed together and the inner wall of the precipitation well; the two water-absorbing hot-melting pipes which are bound and fixed together are recorded as a water-absorbing hot-melting pipe group; the distance between the water stop valve and the top of the sleeve of the over-bottom plate is 40 cm-50 cm;
step 402, opening two water stop valves, starting two self-priming water pumps, and pumping and discharging the water surface height in the dewatering well below the top of the pipe section of the open pore section;
step 403, firstly executing step S3 to step S4, and fixing the bottom of the water-absorbing hot-melting pipe group, wherein the axis of the water-absorbing hot-melting pipe group is overlapped with the axis of the dewatering well;
step 405, uniformly backfilling micro-expansion concrete into the second plugging area until the micro-expansion concrete is backfilled below a water stop valve to form a concrete bottom backfill layer; paving an anti-seepage plugging layer on the top of the concrete bottom backfill layer, and continuously backfilling micro-expansion concrete on the top of the anti-seepage plugging layer until the micro-expansion concrete is backfilled to the top of the through-bottom plate sleeve to form a concrete top backfill layer, wherein the top of the concrete top backfill layer is flush with the top of the through-bottom plate sleeve;
406, continuously pumping and draining water from the self-priming pump, so that the water surface height in the dewatering well is kept below the top of the annular gravel base layer, and waiting for solidification molding of the concrete bottom backfill layer and the concrete top backfill layer; after the concrete bottom backfill layer and the concrete top backfill layer are solidified and formed, the two self-priming water pumps are turned off, the two water stop valves are turned off, the connection between the water-absorbing hot melt pipe group and the self-priming water pumps is disconnected, and the part, higher than the sleeve of the bottom plate, of the top of the water-absorbing hot melt pipe group is cut off; backfilling impermeable cement and micro-expansion concrete into the water-absorbing hot-melting pipe group to form a plugging layer at the top of the hot-melting pipe; the top of the plugging layer at the top of the hot melt pipe is flush with the top of the water-absorbing hot melt pipe;
step 407, welding a sealing steel plate on the top of the over-bottom plate sleeve, backfilling concrete on the peripheral side of the over-bottom plate sleeve to form a bottom plate filling layer, and flushing the top of the bottom plate filling layer with the bottom plate.
The construction method for plugging the precipitation well group with the strong pressurized water after the ultra-deep subway station is sealed is characterized by comprising the following steps of: the outer diameter of the water-absorbing hot-melting pipe is 1/6-1/5 of the inner diameter of the dewatering well.
The construction method for plugging the precipitation well group with the strong pressurized water after the ultra-deep subway station is sealed is characterized by comprising the following steps of: the length of the pipe section of the open-pore section is 1/4L-1/3L.
The construction method for plugging the precipitation well group with the strong pressurized water after the ultra-deep subway station is sealed is characterized by comprising the following steps of: the bottom and the outside of the perforated section pipe section are both wrapped with a filter screen.
The construction method for plugging the precipitation well group with the strong pressurized water after the ultra-deep subway station is sealed is characterized by comprising the following steps of: the broken stone is hard round gravel material with the grain diameter of 4-15 mm.
The construction method for plugging the precipitation well group with the strong pressurized water after the ultra-deep subway station is sealed is characterized by comprising the following steps of: the height ratio of the expansion water-stop layer to the cement pipe sealing layer is 1:2.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the water-absorbing hot-melting pipe and the self-priming water pump are arranged, so that the underground water in the dewatering well is continuously absorbed and discharged when the first plugging area is backfilled and plugged, the water-flushing pressure is reduced, and the water-discharging power is improved, so that the backfilled and plugged first plugging area is not influenced by underground strong-pressure water-flushing, and the stability of a plugging structure in the first plugging area is ensured.
2. According to the invention, the water-absorbing hot-melting pipe is arranged in the dewatering well, so that the first blocking area is formed between the inner wall of the dewatering well and the outer wall of the water-absorbing hot-melting pipe, and the underground strong-pressure water is isolated outside the first blocking area, which is equivalent to reducing the inner diameter of the dewatering well, reducing the blocking difficulty of the dewatering well and having good use effect.
3. According to the invention, the dewatering well group in one construction section is used as one plugging unit for plugging, so that the material conveying track is more optimized, and a plurality of dewatering wells in one plugging unit are plugged at the same time, so that the plugging efficiency of the whole dewatering well group can be increased exponentially, and the construction period is reduced.
4. According to the invention, the concrete backfill layer is formed by casting in the first plugging area once, so that the construction efficiency is high; and a plurality of dewatering wells in a dewatering well group synchronously carry out plugging operation, and concrete backfill layers in a plurality of dewatering wells synchronously wait for solidification forming, so that the construction efficiency is extremely high, the labor force requirement is low, and the construction cost is reduced.
5. According to the invention, the plugging sequences of the plurality of dewatering well groups are arranged, so that the water pressure in the well during plugging operation of the final plugging group is reduced, the well plugging difficulty of the final plugging group is reduced, and the well plugging success rate is improved.
In summary, the plugging sequence of the plurality of dewatering well groups is arranged, the dewatering well groups in one construction section are used as a plugging unit for plugging, so that the water pressure in the well during plugging operation of the final plugging group is reduced, and the difficulty in plugging the final plugging group is reduced; in addition, the water-absorbing hot-melting pipe is arranged in the dewatering well, so that a plugging area is formed between the inner wall of the dewatering well and the outer wall of the water-absorbing hot-melting pipe, underground strong-pressure water is isolated outside the plugging area, the inner diameter of the dewatering well is reduced, the plugging difficulty of the dewatering well is reduced, and the well sealing success rate is improved.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
Fig. 1 is a schematic construction diagram of step S6 of the present invention.
Fig. 2 is a schematic construction diagram of step S8 of the present invention.
Fig. 3 is a schematic diagram of the distribution of precipitation well groups in an ultra-deep subway station according to the invention.
FIG. 4 is a schematic diagram of the construction structure of step 407 of the present invention.
Fig. 5 is a flow chart of the method of the present invention.
Reference numerals illustrate:
1-an ultra-deep subway station; 3-dewatering well; 4-initial plugging group; 5-final plugging group; 6-an intermediate plugging group; 7-a water-absorbing hot-melt tube; 8-a self-priming water pump; 10-perforating a section of pipe; 11-an annular macadam foundation layer; 12-a cement leveling layer; 13-a bottom plate bushing; 14-a concrete backfill layer; 15-swelling water-stopping layer; 16-a cement pipe sealing layer; 17-sealing a steel plate; 18-a floor fill layer; 19-a bottom plate; 20-a water stop valve; 21-a concrete bottom backfill layer; 22-an anti-seepage plugging layer; 23-backfilling the top of the concrete; 24-a sealing layer at the top of the hot melt pipe.
Detailed Description
As shown in fig. 1 to 5, the construction method for plugging the precipitation well group with strong water after the ultra-deep subway station is closed comprises the following steps:
step one, determining the plugging sequence of a precipitation well group:
if the average depth of the dewatering wells 3 in one dewatering well group is larger than the average depth of all the dewatering wells 3, the dewatering well group is recorded as an initial plugging group 4; the number of the initial plugging groups 4 is multiple, and the plugging sequences of the multiple initial plugging groups 4 are sequentially arranged from large to small according to the average depth of the corresponding dewatering well 3;
when only one precipitation well group with the minimum average depth of the precipitation wells 3 is provided in the precipitation well groups, the precipitation well group with the minimum average depth is the final plugging group 5; when the average depth of the dewatering well 3 in the dewatering well groups is the smallest and the dewatering well groups with the smallest average depth are multiple, the dewatering well group with the smallest average depth, which is closest to the large mileage end of the ultra-deep subway station 1, in the plurality of dewatering well groups with the smallest average depth is recorded as a final plugging group 5;
the precipitation well groups except the initial plugging group 4 and the final plugging group 5 are recorded as an intermediate plugging group 6; the number of the middle plugging groups 6 is multiple, and the middle plugging groups 6 plug from the small mileage end of the ultra-deep subway station 1 to the large mileage end of the ultra-deep subway station 1 in sequence;
in the embodiment, the whole ultra-deep subway station 1 is inclined from a large mileage end to a small mileage end by 2 per mill, but a construction section where the center of the ultra-deep subway station 1 is positioned is provided with a fire water pond, the construction section where the two ends of the ultra-deep subway station 1 are positioned is a shield starting section, the construction section is a sinking construction section, and precipitation well groups corresponding to the three sinking construction sections are initial plugging groups 4;
in this embodiment, except for the initial plugging groups 4 at three specific positions, plugging operations are performed first, and the other precipitation well groups are plugged sequentially from the small mileage end to the large mileage end of the ultra-deep subway station 1; along with the larger number of the plugged dewatering wells 3, the larger the water pressure in the remaining non-plugged dewatering wells 3 is, the water pressure in the dewatering wells 3 is obviously increased when the plugging of the dewatering wells 3 is carried out at the later stage according to the depth of the dewatering wells 3 and the height of underground water, so that the plugging sequence is required to be paid attention to when the dewatering wells 3 are plugged, the plugging is carried out from the deepest position and the highest position of the water level of the dewatering wells 3 to the shallowest position and the lowest position of the water level of the dewatering wells 3 in sequence, the water pressure in the wells is reduced when the final plugging group 5 is plugged, and the well plugging difficulty of the final plugging group 5 is reduced.
Step two, plugging of an initial plugging group:
the plugging operation is carried out on a plurality of dewatering wells 3 in one initial plugging group 4 at the same time, and any dewatering well 3 in the initial plugging group 4 is plugged, and the concrete process is as follows:
s1, inserting a water-absorbing hot-melting pipe 7 into a precipitation well 3, forming a first plugging area between the inner wall of the precipitation well 3 and the outer wall of the water-absorbing hot-melting pipe 7, abutting the bottom of the water-absorbing hot-melting pipe 7 with the bottom of the precipitation well 3, connecting the top of the water-absorbing hot-melting pipe 7 with a self-priming water pump 8, and uniformly arranging a plurality of water-absorbing holes on the lower pipe section of the water-absorbing hot-melting pipe 7; recording a pipe section provided with a water absorption hole on the water absorption hot melting pipe 7 as an open-pore section pipe section 10; the length of the perforated section 10 is not more than 1/3L, wherein L is the depth of a precipitation well 3 subjected to plugging operation currently;
in the embodiment, the water-absorbing hot-melt pipe 7 is formed by splicing a plurality of hot-melt pipes, the characteristics of the hot-melt pipes prevent water leakage from occurring at the splicing joint, and the hot-melt pipes have lighter dead weight and are convenient to carry and transport; in addition, before the actual use, whether the surface of the pipe is knocked, bumped and scratched is checked, if the depth of the scratch exceeds 10% of the wall thickness of the pipe, the pipe can be used after partial excision.
S2, starting a self-priming water pump 8, and pumping and discharging the water surface height in the dewatering well 3 below the top of the perforated section 10;
in this embodiment, the water pumping amount of the self-priming pump 8 is greater than the water pumping amount of the dewatering well 3, so that, preferably, the self-priming pump 8 adopts a three-phase self-priming pump of 2.5kw, and the self-priming pump 8 of the model has small volume and is convenient to carry and suitable for being used in a narrow working space after the ultra-deep subway station 1 is closed.
S3, uniformly backfilling gravels into the bottom of the first plugging area to form an annular gravels base layer 11 for stabilizing the bottom of the water-absorbing hot-melt pipe 7, wherein the thickness of the annular gravels base layer 11 is not more than half of the length of the open-pore section 10;
the position of the water-absorbing hot-melting pipe 7 in the dewatering well 3 is adjusted, so that the axis of the water-absorbing hot-melting pipe 7 coincides with the axis of the dewatering well 3;
continuously and uniformly backfilling crushed stone into the first plugging area to increase the top of the annular crushed stone base layer 11 until the top of the annular crushed stone base layer 11 is flush with the top of the open-pore section pipe section 10;
in the step S3, the self-priming water pump 8 continuously sucks and discharges water, so that the outer side of the perforated section pipe section 10 has a small negative pressure, and after the backfilled gravels are immersed into the bottom of the precipitation well 3, strong water rushing into the precipitation well 3 from below impacts the gravels, so that the gravels are vibrated, the outer side of the perforated section pipe section 10 sucks and fixes the gravels back due to the water sucking effect, so that the gravels can stably form an annular gravels base layer 11, the internal gap of the annular gravels base layer 11 is prevented from being too large, the stability of the bottom of the water-sucking hot-melt pipe 7 is ensured, the follow-up swinging of the water-sucking hot-melt pipe 7 during backfilling and plugging of the first plugging area is avoided, and the stability of the plugging structure in the first plugging area is ensured;
the annular broken stone base layer 11 is backfilled twice, the position of the water-absorbing hot-melting pipe 7 in the precipitation well 3 is adjusted between the backfill twice, so that the axis of the water-absorbing hot-melting pipe 7 is overlapped with the axis of the precipitation well 3, the annular width of the first plugging area is uniform, the subsequent time for solidifying micro-expansion concrete is uniform, the situation that one section of micro-expansion concrete is solidified and the other section of micro-expansion concrete is not solidified is avoided, and the stability of a plugging structure in the first plugging area is ensured;
s4, uniformly backfilling cement into the first plugging area, forming a cement leveling layer 12 on the top of the annular broken stone base layer 11, wherein the thickness of the cement leveling layer 12 is less than or equal to 1/4 of the thickness of the annular broken stone base layer 11;
the purpose of the backfill cement screed 12 is to avoid segregation of the backfilled concrete due to the upper gap of the annular gravel base layer 11 being too large.
S5, uniformly backfilling micro-expansion concrete into the first plugging area until the micro-expansion concrete is backfilled into the through-bottom plate sleeve 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 through-bottom plate sleeve 13;
in the embodiment, the micro-expansion concrete adopts micro-expansion C35p10 concrete;
it should be noted that, the vibration needs to be enhanced during the backfilling of the micro-expansive concrete, so as to ensure the compact structure of the concrete backfill layer 14.
S6, continuously pumping and draining water from the self-priming pump 8 to keep the water surface height in the dewatering well 3 below the top of the annular gravel base layer 11, and waiting for the solidification and forming of the concrete backfill layer 14;
when the well sealing material is sealed and filled in the first plugging area, the well sealing material in the first plugging area is not contacted with strong water gushing underground except the annular broken stone base layer 11 due to the continuous pumping and draining functions of the water absorbing hot melting pipe 7, and the concrete backfill layer 14 is cast and molded once, so that the construction efficiency is high; and a plurality of dewatering wells 3 in a dewatering well group synchronously carry out the shutoff operation, and the concrete backfill layer 14 in a plurality of dewatering wells 3 synchronously waits for solidification molding, and the efficiency of construction is high, and the labour demand is low, is favorable to reducing construction cost.
S7, after the concrete backfill layer 14 is solidified and formed, the self-priming water pump 8 is turned off, the connection between the water-absorbing hot-melt pipe 7 and the self-priming water pump 8 is disconnected, the part, higher than the sleeve 13 of the through-bottom plate, of the top of the water-absorbing hot-melt pipe 7 is cut off, water-swelling water-stop glue and cement are filled into the water-absorbing hot-melt pipe 7 in sequence, the water-swelling water-stop glue forms a swelling water-stop layer 15, and the cement backfilled in the water-absorbing hot-melt pipe 7 forms a cement pipe sealing layer 16; the top of the cement sealing pipe layer 16 is flush with the top of the water-absorbing hot-melting pipe 7;
it should be noted that, compared with the pipes such as steel pipes, the water-absorbing hot-melt pipe 7 has a faster cutting speed, avoids the groundwater from rushing out from the water-absorbing hot-melt pipe 7, strives for more time for the filling of the water-swelling water-stop adhesive, and improves the blocking water-stop effect.
S8, welding a sealing steel plate 17 on the top of the over-bottom plate sleeve 13, backfilling concrete on the peripheral side of the over-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 a bottom plate 19;
in this embodiment, the type of concrete used in step S8 is the same as the type of concrete of the bottom plate 19, and the top surface of the bottom plate 19 is flat, clean and beautiful after backfilling is completed.
Step three, plugging of the middle plugging group:
a plurality of middle plugging groups 6 from the small mileage end of the ultra-deep subway station 1 to the large mileage end of the ultra-deep subway station 1 are plugged in sequence; simultaneously plugging a plurality of dewatering wells 3 in any intermediate plugging group 6, wherein the specific process is the same as that of the steps S1 to S8;
and step four, enlarging the water absorption and drainage amount of the dewatering well in the final plugging group, and plugging the final plugging group.
By arranging the water-absorbing hot-melt pipe 7 and the self-priming water pump 8, the underground water in the dewatering well 3 is continuously absorbed and discharged when the first plugging area is backfilled and plugged, the water-flushing pressure is reduced, and the water-discharging power is improved, so that the backfilling and plugging of the first plugging area is not influenced by underground strong-pressure water-flushing, and the stability of a plugging structure in the first plugging area is ensured;
by arranging the water-absorbing hot-melting pipe 7 in the dewatering well 3, a first blocking area is formed between the inner wall of the dewatering well 3 and the outer wall of the water-absorbing hot-melting pipe 7, underground strong-pressure water is isolated outside the first blocking area, the inner diameter of the dewatering well 3 is reduced, the blocking difficulty of the dewatering well 3 is reduced, and the use effect is good;
the dewatering well group in one construction section is used as a plugging unit for plugging, so that the material conveying track is more optimized, and a plurality of dewatering wells 3 in one plugging unit are plugged at the same time, so that the plugging efficiency of the whole dewatering well group can be increased exponentially, and the construction period is reduced;
the concrete backfill layer 14 is formed by casting in the first plugging zone at one time, so that the construction efficiency is high; and a plurality of dewatering wells 3 in one dewatering well group synchronously carry out plugging operation, and concrete backfill layers 14 in a plurality of dewatering wells 3 synchronously wait for solidification forming, so that the construction efficiency is extremely high, the labor requirement is low, and the construction cost is reduced
By arranging the plugging sequences of the plurality of dewatering well groups, the water pressure in the well during plugging operation of the final plugging group 5 is reduced, the well plugging difficulty of the final plugging group 5 is reduced, and the well plugging success rate is improved.
In this embodiment, the specific process of the fourth step is:
the plugging operation is carried out on a plurality of dewatering wells 3 in the final plugging group 5 at the same time, and any dewatering well 3 in the final plugging group 5 is plugged, and the concrete process is as follows:
step 401, inserting two water-absorbing hot-melt pipes 7 which are bound and fixed together into a precipitation well 3, wherein water stop valves 20 are respectively arranged on the two water-absorbing hot-melt pipes 7 which are bound and fixed together, the tops of the two water-absorbing hot-melt pipes 7 are respectively connected with two self-priming water pumps 8, and a second blocking area is arranged between the two water-absorbing hot-melt pipes 7 which are bound and fixed together and the inner wall of the precipitation well 3; the two water-absorbing hot-melting pipes 7 which are bound and fixed together are recorded as a water-absorbing hot-melting pipe group; the distance between the water stop valve 20 and the top of the over-bottom plate sleeve 13 is 40 cm-50 cm;
step 402, opening two water stop valves 20, starting two self-priming water pumps 8, and pumping and discharging the water level in the dewatering well 3 below the top of the perforated section 10;
step 403, firstly executing step S3 to step S4, and fixing the bottom of the water-absorbing hot-melting pipe group, wherein the axis of the water-absorbing hot-melting pipe group is overlapped with the axis of the dewatering well 3;
step 405, uniformly backfilling micro-expansion concrete into the second plugging area until the micro-expansion concrete is backfilled below the water stop valve 20 to form a concrete bottom backfill layer 21; paving an anti-seepage plugging layer 22 on the top of the concrete bottom backfill layer 21, and continuously backfilling micro-expansion concrete on the top of the anti-seepage plugging layer 22 until the micro-expansion concrete is backfilled to the top of the over-bottom plate sleeve 13 to form a concrete top backfill layer 23, wherein the top of the concrete top backfill layer 23 is flush with the top of the over-bottom plate sleeve 13;
406, continuously pumping and draining water from the self-priming pump 8 to keep the water surface height in the dewatering well 3 below the top of the annular gravel base layer 11, and waiting for the solidification and forming of the concrete bottom backfill layer 21 and the concrete top backfill layer 23; after the concrete bottom backfill layer 21 and the concrete top backfill layer 23 are solidified and formed, the two self-priming water pumps 8 are turned off, the two water stop valves 20 are turned off, the connection between the water-absorbing hot-melting pipe group and the self-priming water pumps 8 is disconnected, and the part, higher than the bottom plate sleeve 13, of the top of the water-absorbing hot-melting pipe group is cut off; backfilling impermeable cement and micro-expansion concrete into the water-absorbing hot-melting pipe group to form a hot-melting pipe top plugging layer 24; the top of the hot melt pipe top plugging layer 24 is flush with the top of the water-absorbing hot melt pipe 7;
and 407, welding a sealing steel plate 17 on the top of the over-bottom plate sleeve 13, backfilling concrete on the periphery of the over-bottom plate sleeve 13 to form a bottom plate filling layer 18, and flushing the top of the bottom plate filling layer 18 with the bottom plate 19.
The bottom of the sealing layer 24 at the top of the water stop valve 20 can be reached only by the shielding of the water stop valve 20, the water stop valve 20 blocks the water at the lower part of the water-absorbing hot-melt pipe 7, and the sealing layer 24 at the top of the hot-melt pipe can strengthen the blocking of the water at the lower part of the water-absorbing hot-melt pipe 7 after solidification, so that the sealing steel plate 17 will not leak out even if the water stop valve 20 leaks.
The water stop valve 20 is arranged at a position 40 cm-50 cm below the top of the bottom plate sleeve 13, so that a constructor can conveniently extend a hand into the bottom plate sleeve 13 to operate the water stop valve 20.
The impermeable plugging layer 22 is formed by laying a water-impermeable material.
In this embodiment, the thickness of the anti-leakage blocking layer 22 is not less than 10cm.
In this embodiment, the plugging layer 24 at the top of the hot-melt pipe is formed by solidifying the impermeable cement which is poured into the water-absorbing hot-melt pipe 7 at a thickness of not less than 100mm and the micro-expansive concrete which is poured later.
In the embodiment, when the precipitation well 3 in the final plugging group 5 in the fourth step is plugged, the self-priming water pump 8 in the second step is adopted to be installed in series, so that the water sucking and draining power is doubled.
In this embodiment, the outer diameter of the water-absorbing hot-melt pipe 7 is 1/6 to 1/5 of the inner diameter of the dewatering well 3.
It should be noted that, the outside diameter of the water-absorbing hot-melting pipe 7 is too small to pump and discharge underground water in time, and too large to ensure the stability of the annular backfill structure of the pre-backfill.
In this embodiment, the length of the perforated section 10 is 1/4L to 1/3L.
In this embodiment, the bottom and the outer side of the perforated section 10 are both wrapped with a filter screen.
The filter screen is used for preventing impurities in the underground water from entering the water-absorbing hot melting pipe 7, so that the self-priming water pump 8 is prevented from being blocked, and long-time continuous water-absorbing and draining operation of the self-priming water pump 8 is ensured.
In this embodiment, the crushed stone is a hard round gravel material with a particle size of 4 mm-15 mm.
It should be noted that, need screen the rubble before rubble backfill, avoid appearing slice, needle-like stone bits in the rubble, avoid the packing speed too fast or uneven to cause the gravel material to put on a bridge the phenomenon in the hole, guarantee normal water absorption and drainage.
In this embodiment, the height ratio of the expansion water-blocking layer 15 to the cement pipe sealing layer 16 is 1:2.
It should be noted that, the water-swelling water-stop adhesive needs to be rapidly filled into the water-absorbing hot-melt tube 7 within two minutes, and uses the thin steel bars to vibrate, so as to ensure the compactness of the swelling water-stop layer 15, form the first water-stop structure in the water-absorbing hot-melt tube 7, and then backfill with cement, the swelling water-stop layer 15 can prevent the strong water from continuing to upwelling, so that the time is strived for the setting and solidification of the cement pipe-sealing layer 16, and the water-stop effect and the structural stability of the cement pipe-sealing layer 16 as the second water-stop structure are ensured.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a construction method is plugged to precipitation well group of taking strong pressurized water after super dark subway station seals, a plurality of construction sections have been distributed along its length direction in super dark subway station (1), all have a precipitation well group in every construction section, one precipitation well group includes a plurality of precipitation wells (3) of taking strong pressurized water, the top of precipitation well (3) is provided with through-floor sleeve pipe (13), all precipitation wells (3) in super dark subway station (1) constitute precipitation well group, its characterized in that, this method includes following steps:
step one, determining the plugging sequence of a precipitation well group:
if the average depth of the dewatering wells (3) in one dewatering well group is larger than the average depth of all the dewatering wells (3), the dewatering well group is marked as an initial plugging group (4); the number of the initial plugging groups (4) is multiple, and the plugging sequences of the multiple initial plugging groups (4) are sequentially arranged from large to small according to the average depth of the corresponding dewatering well (3);
when only one precipitation well group with the smallest average depth of the precipitation wells (3) in the precipitation well groups is provided, the precipitation well group with the smallest average depth is a final plugging group (5); when a plurality of precipitation well groups with the smallest average depth of the precipitation wells (3) in the precipitation well groups and the smallest average depth are provided, the precipitation well group with the smallest average depth, which is closest to the large mileage end of the ultra-deep subway station (1), in the precipitation well groups with the smallest average depth is recorded as a final plugging group (5);
the precipitation well groups except the initial plugging group (4) and the final plugging group (5) are recorded as an intermediate plugging group (6); the number of the middle plugging groups (6) is multiple, and the middle plugging groups (6) sequentially plug from the small mileage end of the ultra-deep subway station (1) to the large mileage end of the ultra-deep subway station (1);
step two, plugging of an initial plugging group:
the method comprises the following steps of simultaneously plugging a plurality of dewatering wells (3) in one initial plugging group (4), and plugging any dewatering well (3) in the initial plugging group (4):
s1, inserting a water-absorbing hot-melting pipe (7) into a precipitation well (3), forming a first blocking area between the inner wall of the precipitation well (3) and the outer wall of the water-absorbing hot-melting pipe (7), abutting the bottom of the water-absorbing hot-melting pipe (7) with the bottom of the precipitation well (3), connecting the top of the water-absorbing hot-melting pipe (7) with a self-priming water pump (8), and uniformly arranging a plurality of water-absorbing holes on the lower pipe section of the water-absorbing hot-melting pipe (7); recording a pipe section provided with a water absorption hole on the water absorption hot melting pipe (7) as an open-pore section pipe section (10); the length of the perforated section pipe section (10) is not more than 1/3L, wherein L is the well depth of a precipitation well (3) for plugging operation at present;
s2, starting a self-priming water pump (8), and pumping and discharging the water surface height in the dewatering well (3) to below the top of the perforated section pipe section (10);
s3, uniformly backfilling gravels into the bottom of the first plugging area to form an annular gravels base layer (11) for stabilizing the bottom of the water-absorbing hot-melt pipe (7), wherein the thickness of the annular gravels base layer (11) is not more than half of the length of the pipe section (10) of the open pore section;
the position of the water-absorbing hot-melting pipe (7) in the dewatering well (3) is adjusted, so that the axis of the water-absorbing hot-melting pipe (7) coincides with the axis of the dewatering well (3);
continuously and uniformly backfilling crushed stone into the first plugging area to enable the top of the annular crushed stone base layer (11) to be increased until the top of the annular crushed stone base layer (11) is flush with the top of the perforated section pipe section (10);
s4, uniformly backfilling cement into the first plugging area, and forming a cement leveling layer (12) on the top of the annular broken stone base layer (11), wherein the thickness of the cement leveling layer (12) is less than or equal to 1/4 of the thickness of the annular broken stone base layer (11);
s5, uniformly backfilling micro-expansion concrete into the first plugging area until the micro-expansion concrete is backfilled into a through-bottom plate sleeve (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 through-bottom plate sleeve (13);
s6, continuously pumping and draining water from the water suction pump (8), keeping the water surface height in the dewatering well (3) below the top of the annular broken stone base layer (11), and waiting for solidification and forming of the concrete backfill layer (14);
s7, after the concrete backfill layer (14) is solidified and formed, the self-priming water pump (8) is turned off, the connection between the water-absorbing hot-melting pipe (7) and the self-priming water pump (8) is disconnected, the part, higher than the sleeve (13) of the baseplate, of the top of the water-absorbing hot-melting pipe (7) is cut off, water-swelling water-stop glue and cement are filled into the water-absorbing hot-melting pipe (7) in sequence, the water-swelling water-stop glue forms a swelling water-stop layer (15), and the cement backfilled in the water-absorbing hot-melting pipe (7) forms a cement sealing pipe layer (16); the top of the cement pipe sealing layer (16) is flush with the top of the water-absorbing hot melting pipe (7);
s8, welding a sealing steel plate (17) on the top of the over-bottom plate sleeve (13), backfilling concrete on the periphery of the over-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 upper surface of the bottom plate (19);
step three, plugging of the middle plugging group:
a plurality of middle plugging groups (6) from a small mileage end of the ultra-deep subway station (1) to a large mileage end of the ultra-deep subway station (1) are plugged in sequence; simultaneously plugging a plurality of dewatering wells (3) in any intermediate plugging group (6), wherein the specific process is the same as that of the steps S1 to S8;
and step four, enlarging the water absorption and drainage amount of the dewatering well in the final plugging group, and plugging the final plugging group.
2. The construction method for plugging the precipitation well group with strong water after the ultra-deep subway station is closed is characterized in that: the specific process of the fourth step is as follows:
the method comprises the following steps of simultaneously plugging a plurality of dewatering wells (3) in a final plugging group (5), and plugging any dewatering well (3) in the final plugging group (5), wherein the concrete process is as follows:
step 401, inserting two water-absorbing hot-melting pipes (7) which are bound and fixed together into a precipitation well (3), wherein water-stop valves (20) are respectively arranged on the two water-absorbing hot-melting pipes (7) which are bound and fixed together, the tops of the two water-absorbing hot-melting pipes (7) are respectively connected with two self-priming water pumps (8), and a second plugging area is arranged between the two water-absorbing hot-melting pipes (7) which are bound and fixed together and the inner wall of the precipitation well (3); the two water-absorbing hot-melting pipes (7) which are bound and fixed together are recorded as a water-absorbing hot-melting pipe group; the distance between the water stop valve (20) and the top of the through-bottom plate sleeve (13) is 40 cm-50 cm;
step 402, opening two water stop valves (20), starting two self-priming water pumps (8), and pumping and discharging the water level in the dewatering well (3) below the top of the perforated section (10);
step 403, firstly executing step S3 to step S4, and fixing the bottom of the water-absorbing hot-melting pipe group, wherein the axis of the water-absorbing hot-melting pipe group is overlapped with the axis of the dewatering well (3);
step 405, uniformly backfilling micro-expansion concrete into the second plugging area until the micro-expansion concrete is backfilled below the water stop valve (20) to form a concrete bottom backfill layer (21); paving an anti-seepage plugging layer (22) on the top of the concrete bottom backfill layer (21), and continuously backfilling micro-expansion concrete on the top of the anti-seepage plugging layer (22) until the micro-expansion concrete is backfilled to the top of the bottom plate sleeve (13) to form a concrete top backfill layer (23), wherein the top of the concrete top backfill layer (23) is flush with the top of the bottom plate sleeve (13);
406, continuously pumping and draining water from a water suction pump (8), keeping the water surface height in a dewatering well (3) below the top of an annular broken stone base layer (11), and waiting for solidification molding of a concrete bottom backfill layer (21) and a concrete top backfill layer (23); after the concrete bottom backfill layer (21) and the concrete top backfill layer (23) are solidified and formed, the two self-priming water pumps (8) are turned off, the two water stop valves (20) are closed, the water-absorbing hot-melting pipe group is disconnected from the self-priming water pumps (8), and the part, higher than the bottom plate sleeve (13), of the top of the water-absorbing hot-melting pipe group is cut off; backfilling impermeable cement and micro-expansion concrete into the water-absorbing hot-melting pipe group to form a hot-melting pipe top plugging layer (24); the top of the hot melt pipe top blocking layer (24) is flush with the top of the water-absorbing hot melt pipe (7);
and 407, welding a sealing steel plate (17) on the top of the over-bottom plate sleeve (13), backfilling concrete on the periphery of the over-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).
3. The construction method for plugging the precipitation well group with strong water after the ultra-deep subway station is closed is characterized in that: the outer diameter of the water-absorbing hot melting pipe (7) is 1/6-1/5 of the inner diameter of the dewatering well (3).
4. The construction method for plugging the precipitation well group with strong water after the ultra-deep subway station is closed is characterized in that: the length of the perforated section pipe section (10) is 1/4L-1/3L.
5. The construction method for plugging the precipitation well group with strong water after the ultra-deep subway station is closed is characterized in that: the bottom and the outer side of the perforated section pipe section (10) are both wrapped with filter screens.
6. The construction method for plugging the precipitation well group with strong water after the ultra-deep subway station is closed is characterized in that: the broken stone is hard round gravel material with the grain diameter of 4-15 mm.
7. The construction method for plugging the precipitation well group with strong water after the ultra-deep subway station is closed is 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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Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561372A (en) * | 2011-12-23 | 2012-07-11 | 中国十七冶集团有限公司 | Plugging method for downcomer for well-point dewatering of deep foundation pit |
| CN103343543A (en) * | 2013-07-09 | 2013-10-09 | 中国一冶集团有限公司 | Foundation pit dewatering well pressure-reduction-type plugging method |
| CN103993615A (en) * | 2014-05-20 | 2014-08-20 | 中国建筑第二工程局有限公司 | Large-drawdown pipe well plugging structure and construction method thereof |
| CN206346209U (en) * | 2016-12-09 | 2017-07-21 | 中国一冶集团有限公司 | A kind of quick solution dewatering well piping plugging structure |
| CN107059903A (en) * | 2017-05-26 | 2017-08-18 | 南通八建集团有限公司 | Bottom plate plugging dewatering well construction method is worn in foundation ditch |
| CN107620312A (en) * | 2017-08-27 | 2018-01-23 | 中铁十二局集团有限公司 | High hydraulic pressure precipitation well construction and hydrostatic slip casting method for blocking in a kind of Metro station excavation |
| CN107964971A (en) * | 2017-11-23 | 2018-04-27 | 北京地矿工程建设有限责任公司 | A kind of precipitation method of subway station using the construction of PBA engineering methods |
| CN108589753A (en) * | 2018-04-27 | 2018-09-28 | 中铁十二局集团有限公司 | Dewatering well crosses bottom plate method for blocking |
| CN208009458U (en) * | 2018-01-26 | 2018-10-26 | 广州珠江工程建设监理有限公司 | A kind of artificial digging pile minor diameter dewatering well corollary apparatus |
| WO2018214143A1 (en) * | 2017-05-26 | 2018-11-29 | 南通八建集团有限公司 | Construction method for plugging dewatering well having penetrating bottom plate in foundation pit |
| CN208235554U (en) * | 2018-03-30 | 2018-12-14 | 中天建设集团有限公司 | A kind of installation of pressure-bearing dewatering well and plugging device |
| CN110528546A (en) * | 2019-08-09 | 2019-12-03 | 天津建工城市建设发展有限公司 | Bottom plate plugging dewatering well construction method is worn in a kind of foundation pit |
| CN111101532A (en) * | 2020-01-10 | 2020-05-05 | 中铁第一勘察设计院集团有限公司 | Method for treating subway station base underground water in water-rich red sandstone stratum |
| DE202020106399U1 (en) * | 2020-06-30 | 2020-11-20 | No.4 Engineering Co., Ltd Of China Railway No. 9 Group | Blocking device for blocking a drainage shaft |
| CN212742598U (en) * | 2020-07-31 | 2021-03-19 | 中冶建工集团(天津)建设工程有限公司 | Precipitation well block structure |
| CN112647524A (en) * | 2020-12-18 | 2021-04-13 | 中国五冶集团有限公司 | Plugging method for dewatering well in foundation pit |
| CN213233514U (en) * | 2020-06-23 | 2021-05-18 | 中电建十一局工程有限公司 | Dewatering well structure for deep foundation pit of subway station |
| CN113187552A (en) * | 2021-06-09 | 2021-07-30 | 中铁七局集团郑州工程有限公司 | Construction method for plugging ultra-large diameter tunnel under water-rich stratum |
| CN214497558U (en) * | 2020-11-20 | 2021-10-26 | 中铁十一局集团城市轨道工程有限公司 | Foundation pit dewatering well wellhead plugging casing pipe and structure |
-
2022
- 2022-03-18 CN CN202210269091.3A patent/CN114482105B/en active Active
Patent Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102561372A (en) * | 2011-12-23 | 2012-07-11 | 中国十七冶集团有限公司 | Plugging method for downcomer for well-point dewatering of deep foundation pit |
| CN103343543A (en) * | 2013-07-09 | 2013-10-09 | 中国一冶集团有限公司 | Foundation pit dewatering well pressure-reduction-type plugging method |
| CN103993615A (en) * | 2014-05-20 | 2014-08-20 | 中国建筑第二工程局有限公司 | Large-drawdown pipe well plugging structure and construction method thereof |
| CN206346209U (en) * | 2016-12-09 | 2017-07-21 | 中国一冶集团有限公司 | A kind of quick solution dewatering well piping plugging structure |
| CN107059903A (en) * | 2017-05-26 | 2017-08-18 | 南通八建集团有限公司 | Bottom plate plugging dewatering well construction method is worn in foundation ditch |
| WO2018214143A1 (en) * | 2017-05-26 | 2018-11-29 | 南通八建集团有限公司 | Construction method for plugging dewatering well having penetrating bottom plate in foundation pit |
| CN107620312A (en) * | 2017-08-27 | 2018-01-23 | 中铁十二局集团有限公司 | High hydraulic pressure precipitation well construction and hydrostatic slip casting method for blocking in a kind of Metro station excavation |
| CN107964971A (en) * | 2017-11-23 | 2018-04-27 | 北京地矿工程建设有限责任公司 | A kind of precipitation method of subway station using the construction of PBA engineering methods |
| CN208009458U (en) * | 2018-01-26 | 2018-10-26 | 广州珠江工程建设监理有限公司 | A kind of artificial digging pile minor diameter dewatering well corollary apparatus |
| CN208235554U (en) * | 2018-03-30 | 2018-12-14 | 中天建设集团有限公司 | A kind of installation of pressure-bearing dewatering well and plugging device |
| CN108589753A (en) * | 2018-04-27 | 2018-09-28 | 中铁十二局集团有限公司 | Dewatering well crosses bottom plate method for blocking |
| CN110528546A (en) * | 2019-08-09 | 2019-12-03 | 天津建工城市建设发展有限公司 | Bottom plate plugging dewatering well construction method is worn in a kind of foundation pit |
| CN111101532A (en) * | 2020-01-10 | 2020-05-05 | 中铁第一勘察设计院集团有限公司 | Method for treating subway station base underground water in water-rich red sandstone stratum |
| CN213233514U (en) * | 2020-06-23 | 2021-05-18 | 中电建十一局工程有限公司 | Dewatering well structure for deep foundation pit of subway station |
| DE202020106399U1 (en) * | 2020-06-30 | 2020-11-20 | No.4 Engineering Co., Ltd Of China Railway No. 9 Group | Blocking device for blocking a drainage shaft |
| CN212742598U (en) * | 2020-07-31 | 2021-03-19 | 中冶建工集团(天津)建设工程有限公司 | Precipitation well block structure |
| CN214497558U (en) * | 2020-11-20 | 2021-10-26 | 中铁十一局集团城市轨道工程有限公司 | Foundation pit dewatering well wellhead plugging casing pipe and structure |
| CN112647524A (en) * | 2020-12-18 | 2021-04-13 | 中国五冶集团有限公司 | Plugging method for dewatering well in foundation pit |
| CN113187552A (en) * | 2021-06-09 | 2021-07-30 | 中铁七局集团郑州工程有限公司 | Construction method for plugging ultra-large diameter tunnel under water-rich stratum |
Non-Patent Citations (3)
| Title |
|---|
| 地铁工程降水井封井技术措施;郭志明;;建筑技术;20200715(07);全文 * |
| 地铁超深基坑坑内降水及降水井封堵施工技术;陈民;;中国建材科技;20200425(02);全文 * |
| 谈福州地铁1号线葫芦阵站深基坑降排水方案;左凯生;;山西建筑;20120910(26);全文 * |
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