CN114482105A - Construction method for plugging dewatering well group with strong pressure water after ultra-deep subway station is sealed - Google Patents
Construction method for plugging dewatering well group with strong pressure water after ultra-deep subway station is sealed Download PDFInfo
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Abstract
The invention discloses a construction method for plugging a precipitation well group with strong pressurized water after an ultra-deep subway station is sealed, which comprises the following steps: firstly, determining the plugging sequence of a precipitation well group; secondly, plugging the initial plugging group; thirdly, plugging the middle plugging group; and fourthly, 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 sequence of a plurality of precipitation well groups is arranged, and the precipitation well group in a construction section is used as a plugging unit for plugging, so that the water pressure in the well during the 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 absorption 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 absorption 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 plugging success rate is improved.
Description
Technical Field
The invention belongs to the technical field of precipitation well plugging, and particularly relates to a precipitation well group plugging construction method with high-pressure water after an ultra-deep subway station is sealed.
Background
In the stratum with confined water, in order to prevent the instability problems of flowing soil, sudden gushing and the like at the bottom of a 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 multi-layer 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, plugging failure is easy to cause, 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; the following situations can occur when the conventional method is adopted to plug the ultra-deep subway station precipitation well group: after the pump of the dewatering well is stopped, a large amount of underground water begins to flow out of the well mouth in about 2 minutes, and the concrete slurry is continuously flushed out due to excessive water pressure, so that the concrete solidification is influenced, and the plugging effect is poor; on site, each sealing of one dewatering well can lead to the increase of the water inflow and pressure of the remaining non-sealed dewatering well, and the difficulty of subsequent well sealing is continuously increased, thereby leading to the continuous increase of well sealing cost. Therefore, a construction method for plugging a precipitation well group with high-pressure water after being sealed in an ultra-deep subway station is needed to solve the problems.
Disclosure of Invention
The invention aims to solve the technical problem that the defects in the prior art are overcome, and provides a method for plugging a precipitation well group with high-pressure water after being sealed in an ultra-deep subway station, wherein a plurality of precipitation well groups are sequentially arranged, and the precipitation well group in a construction section is used as a plugging unit for plugging, so that the water pressure in a well during the plugging operation of the final plugging group is reduced, and the difficulty in plugging the final plugging group is reduced; in addition, the water absorption 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 absorption 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 plugging success rate is improved.
In order to solve the technical problems, the invention adopts the technical scheme that: a construction method for plugging a precipitation well group with high-pressure water after the ultra-deep subway station is sealed is characterized in that a plurality of construction sections are distributed in the ultra-deep subway station along the length direction of the ultra-deep subway station, each construction section is internally provided with a precipitation well group, one precipitation well group comprises a plurality of precipitation wells with high-pressure water, the top of each precipitation well is provided with a bottom plate sleeve, and all precipitation wells in the ultra-deep subway station form the precipitation well group, and the method comprises the following steps:
step one, determining the plugging sequence of the precipitation well group:
if the average depth of the dewatering wells in one dewatering well group is greater than the average depth of all dewatering wells, recording the dewatering well group as an initial plugging group; the number of the initial plugging groups is multiple, and the plugging sequence of the initial plugging groups is arranged in sequence from large to small according to the average depth of the corresponding precipitation wells;
if the average depth of the dewatering wells in one dewatering well group is the minimum and the dewatering wells are closest to the large mileage end of the ultra-deep subway station, recording the dewatering well group as a final plugging group;
recording the dewatering 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 are sequentially plugged from a small mileage end of the ultra-deep subway station to a large mileage end of the ultra-deep subway station;
step two, plugging of the 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 comprises the following steps:
s1, inserting a water absorption hot melt pipe into the precipitation well, forming a first plugging area between the inner wall of the precipitation well and the outer wall of the water absorption hot melt pipe, enabling the bottom of the water absorption hot melt pipe to be abutted against the bottom of the precipitation well, connecting the top of the water absorption hot melt pipe with a self-priming water pump, and uniformly forming a plurality of water absorption holes in the lower pipe section of the water absorption hot melt pipe; recording a pipe section provided with a water suction hole on the water suction hot melting pipe as an open hole section pipe section; the length of the open hole section pipe section is not more than 1/3L, wherein L is the well depth of the dewatering well currently performing plugging operation;
s2, starting a self-priming water pump, and pumping the water surface height in the dewatering well to be below the top of the pipe section of the perforated section;
s3, uniformly backfilling crushed stones into the bottom of the first plugging area to form an annular crushed stone base layer for stabilizing the bottom of the water absorption hot melting pipe, wherein the thickness of the annular crushed stone base layer is not more than half of the length of the pipe section of the perforated section;
adjusting the position of the water absorption hot melt pipe in the precipitation well to ensure that the axis of the water absorption hot melt pipe is superposed with the axis of the precipitation well;
continuously backfilling broken stones into the first plugging area uniformly to enable the top of the annular broken stone base layer to be increased until the top of the annular broken stone base layer is flush with the top of the perforated section pipe section;
s4, uniformly backfilling cement into the first blocking area, forming a cement leveling layer at the top of the annular gravel base layer, wherein the thickness of the cement leveling layer is less than or equal to 1/4 of that of the annular gravel base layer;
s5, uniformly backfilling micro-expansion concrete into the first plugging area until the micro-expansion concrete is backfilled into the bottom plate passing casing pipe 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 passing casing pipe;
s6, continuously pumping and draining water by a self-priming water pump, keeping the water surface height in the dewatering well below the top of the annular gravel base layer, and waiting for the concrete backfill layer to be solidified and formed;
s7, after the concrete backfill layer is solidified and formed, stopping the self-priming water pump, disconnecting the water-absorbing hot-melting pipe from the self-priming water pump, cutting off the part of the top of the water-absorbing hot-melting pipe, which is higher than the sleeve pipe of the bottom plate, and rapidly filling water-swelling water-stopping glue and cement into the water-absorbing hot-melting pipe in sequence to form a swelling water-stopping layer, wherein the cement filled into the water-absorbing hot-melting pipe forms a cement pipe sealing layer; the top of the cement pipe sealing layer is flush with the top of the water absorption hot melt pipe;
s8, welding a sealing steel plate on the top of the sleeve pipe passing through the bottom plate, and backfilling concrete on the peripheral side of the sleeve pipe passing through the bottom plate 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 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 one middle plugging group, wherein the specific process is the same as that from the step S1 to the step S8;
and step four, increasing 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 dewatering well group with the pressurized water after the ultra-deep subway station is sealed is characterized by comprising the following steps: the concrete process of the step four 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 comprises the following steps:
step 401, inserting two bound and fixed water absorption hot melt pipes into a precipitation well, installing water stop valves on the two bound and fixed water absorption hot melt pipes, respectively connecting the tops of the two water absorption hot melt pipes with two self-priming water pumps, and arranging a second plugging area between the two bound and fixed water absorption hot melt pipes and the inner wall of the precipitation well; recording the two water-absorbing hot-melting pipes bound and fixed together as a water-absorbing hot-melting pipe group; the distance between the water stop valve and the top of the sleeve passing through the bottom plate is 40-50 cm;
step 402, opening two water stop valves, starting two self-priming water pumps, and pumping the water surface height in the dewatering well to be below the top of the perforated section pipe section;
step 403, firstly, executing steps S3 to S4, and fixing the bottom of the water absorption hot melt pipe group, wherein the axis of the water absorption hot melt 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 to the position below the water stop valve to form a concrete bottom backfill layer; laying an anti-seepage plugging layer on the top of the backfill layer at the bottom of the concrete, continuously backfilling the micro-expansive concrete on the top of the anti-seepage plugging layer until the micro-expansive concrete is backfilled to the top of the sleeve pipe passing through the bottom plate to form a backfill layer at the top of the concrete, wherein the top of the backfill layer at the top of the concrete is flush with the top of the sleeve pipe passing through the bottom plate;
step 406, continuously pumping and draining water by using a self-priming water pump to keep the water surface height in the dewatering well below the top of the annular gravel base layer, and waiting for the solidification and the forming of the backfill layer at the bottom of the concrete and the backfill layer at the top of the concrete; after the concrete bottom backfill layer and the concrete top backfill layer are solidified and formed, the two self-priming water pumps are shut down, the two water stop valves are closed, the connection between the water-absorbing hot-melting tube group and the self-priming water pumps is disconnected, and the part of the top of the water-absorbing hot-melting tube group, which is higher than the bottom plate sleeve, is cut off; filling impermeable cement and micro-expansion concrete into the water-absorbing hot-melting pipe group to form a top plugging layer of the hot-melting pipe; the top of the blocking layer at the top of the hot melting pipe is flush with the top of the water absorption hot melting pipe;
and 407, welding a sealing steel plate on the top of the sleeve pipe passing through the bottom plate, and backfilling concrete on the peripheral side of the sleeve pipe passing through the bottom plate to form a bottom plate filling layer, wherein the top of the bottom plate filling layer is flush with the bottom plate.
The construction method for plugging the dewatering well group with the pressurized water after the ultra-deep subway station is sealed is characterized by comprising the following steps: the outer diameter of the water absorption hot melting pipe is 1/6-1/5 of the inner diameter of the dewatering well.
The construction method for plugging the dewatering well group with the pressurized water after the ultra-deep subway station is sealed is characterized by comprising the following steps: the length of the open hole section pipe section is 1/4L-1/3L.
The construction method for plugging the dewatering well group with the pressurized water after the ultra-deep subway station is sealed is characterized by comprising the following steps: the bottom and the outer side of the open section pipe section are wrapped by filter screens.
The construction method for plugging the dewatering well group with the pressurized water after the ultra-deep subway station is sealed is characterized by comprising the following steps: the gravel is hard round gravel with the particle size of 4-15 mm.
The construction method for plugging the dewatering well group with the pressurized water after the ultra-deep subway station is sealed is characterized by comprising the following steps: 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, by arranging the water-absorbing hot-melting pipe and the self-sucking water pump, underground water in the precipitation well is continuously sucked and discharged when the first 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 first plugging area are not influenced by underground strong-pressure water burst, and the stability of a plugging structure in the first plugging area is ensured.
2. According to the invention, the water absorption hot melting pipe is arranged in the dewatering well, so that a first plugging area is formed between the inner wall of the dewatering well and the outer wall of the water absorption hot melting pipe, and underground strong pressure water is isolated outside the first plugging area, which is equivalent to reducing the inner diameter of the dewatering well, reducing the plugging difficulty of the dewatering well and achieving a good using effect.
3. According to the invention, the precipitation well group in one construction section is used as one plugging unit for plugging, so that the material conveying track is optimized, and a plurality of precipitation wells in one plugging unit are plugged simultaneously, so that the plugging efficiency of the whole precipitation well group can be increased by times, and the construction period is reduced.
4. According to the invention, the concrete backfill layer is formed in the first plugging area by one-step pouring, so that the construction efficiency is high; and a plurality of precipitation wells in one precipitation well group are plugged synchronously, and concrete backfill layers in the precipitation wells synchronously wait for solidification and formation, so that the construction efficiency is high, the labor demand is low, and the construction cost is reduced.
5. According to the invention, the plugging sequence of the plurality of dewatering well groups is arranged, so that the water pressure in the well during the 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 conclusion, the water pressure in the well during the final plugging operation of the plugging group is reduced, and the well plugging difficulty of the final plugging group is reduced by arranging the plugging sequences of the plurality of precipitation well groups and using the precipitation well group in one construction section as one plugging unit for plugging; in addition, the water absorption 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 absorption 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 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 construction structure diagram of step S6 of the present invention.
Fig. 2 is a schematic construction structure diagram of step S8 of the present invention.
Fig. 3 is a schematic distribution diagram of the precipitation well group in the ultra-deep subway station.
FIG. 4 is a schematic diagram of the construction of step 407 of the present invention.
FIG. 5 is a block flow diagram of a method of the present invention.
Description of reference numerals:
1-ultra deep subway station; 3-dewatering well; 4-initial plugging group; 5-final plugging group; 6-middle plugging group; 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-a base plate; 20-a water stop valve; 21-a concrete bottom backfill layer; 22-impervious leaking stoppage layer; 23-backfilling the top of the concrete; 24-hot melt tube top blocking layer.
Detailed Description
As shown in fig. 1 to 5, the construction method for plugging the precipitation well group with the pressurized water after the ultra-deep subway station is plugged 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 greater than the average depth of all the dewatering wells 3, recording the dewatering well group as an initial plugging group 4; the number of the initial plugging groups 4 is multiple, and the plugging sequence of the initial plugging groups 4 is arranged in sequence from large to small according to the average depth of the corresponding precipitation wells 3;
if the average depth of the dewatering wells 3 in one dewatering well group is the minimum and is closest to the large mileage end of the ultra-deep subway station 1, recording the dewatering well group as a final plugging group 5;
the dewatering well groups except the initial plugging group 4 and the final plugging group 5 are marked as an intermediate plugging group 6; the number of the middle plugging groups 6 is multiple, and the middle plugging groups 6 are sequentially plugged from a small mileage end of the ultra-deep subway station 1 to a large mileage end of the ultra-deep subway station 1;
in the embodiment, the whole ultra-deep subway station 1 is set to slope from a large mileage end to a small mileage end by 2 thousandth, wherein a construction section in the center of the ultra-deep subway station 1 is provided with a fire pool which is a sinking construction section, construction sections at two ends of the ultra-deep subway station 1 are shield starting sections which are sinking construction sections, and a precipitation well group corresponding to the three sinking construction sections is an initial plugging group 4;
it should be noted that, in this embodiment, except that the initial plugging group 4 at three special positions firstly performs plugging operation, other precipitation well groups perform plugging sequentially from the small mileage end to the large mileage end of the ultra-deep subway station 1; along with the more well sealing quantity, the more the water pressure in the remaining non-sealed precipitation well 3 is, according to the difference of the depth of the precipitation well 3 and the height of underground water, the water pressure in the precipitation well 3 is obviously increased in the later stage of plugging, so the plugging sequence needs to be noticed when the precipitation well 3 is plugged, plugging is started from the deepest position and the highest position of the water level of the precipitation well 3 to the shallowest position and the lowest position of the water level in sequence, the water pressure in the well during the final plugging operation of the plugging group 5 is reduced, and the well sealing difficulty of the final plugging group 5 is reduced.
Step two, plugging of the initial plugging group:
simultaneously plugging a plurality of dewatering wells 3 in an initial plugging group 4, and plugging any dewatering well 3 in the initial plugging group 4, wherein the specific process is as follows:
s1, inserting a water-absorbing hot-melting tube 7 into the dewatering well 3, forming a first blocking area between the inner wall of the dewatering well 3 and the outer wall of the water-absorbing hot-melting tube 7, abutting the bottom of the water-absorbing hot-melting tube 7 against the bottom of the dewatering well 3, connecting the top of the water-absorbing hot-melting tube 7 with a self-sucking water pump 8, and uniformly arranging a plurality of water sucking holes in the lower pipe section of the water-absorbing hot-melting tube 7; a pipe section provided with a water suction hole on the water suction hot melting pipe 7 is marked as an open hole section pipe section 10; the length of the open hole section pipe section 10 is not more than 1/3L, wherein L is the well depth of the dewatering well 3 currently performing plugging operation;
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, the volume of drawing water of self priming pump 8 is greater than the water inflow of precipitation well 3, and is consequently, 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 behind the ultra-deep subway station 1 seals.
S3, uniformly backfilling crushed stones into the bottom of the first 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 first 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 pipe section 10 of the perforated section 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 pipe section 10 of the perforated section sucks and fixes the gravel due to the water sucking function, so that the gravel can be stabilized to form the annular gravel base layer 11, and the inner gap of the annular gravel base layer 11 is prevented from being too large, so as to ensure the stability of the pipe bottom of the water-sucking hot-melting pipe 7, and prevent the water-sucking hot-melting pipe 7 from swinging when the subsequent first plugging area is backfilled and plugged, and ensure the stability of the plugging structure in the first 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, so that the annular width of the first plugging area is uniform, the subsequent micro-expansion concrete is uniform in solidification time, 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 first plugging area is ensured;
s4, uniformly backfilling cement into the first blocking area, forming a cement leveling layer 12 on the top of the annular gravel 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 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 micro-expansion concrete into the first plugging area until the micro-expansion concrete is backfilled into the through-floor casing pipe 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-floor casing pipe 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, so as 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 plugging material is plugged in the first plugging area, the well plugging material in the first plugging area cannot contact the strong pressure water flowing downwards except the annular gravel base layer 11 due to the continuous pumping and drainage function of the water absorption hot melting pipe 7, 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 formation, so that the construction efficiency is 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.
Step three, plugging the middle plugging group:
sequentially plugging 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; simultaneously plugging a plurality of dewatering wells 3 in any one intermediate plugging group 6, wherein the specific process is the same as that from step S1 to step S8;
and step four, increasing the water absorption and drainage amount of the dewatering well in the final plugging group, and plugging the final plugging group.
It should be noted that by arranging the water absorption hot melting pipe 7 and the self-sucking water pump 8, the underground water in the dewatering well 3 is continuously sucked and discharged when the first 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 first plugging area are not influenced by the underground strong pressure water burst, and the stability of a plugging structure in the first plugging area is ensured;
the water absorption hot melting pipe 7 is arranged in the dewatering well 3, so that a first plugging area is formed between the inner wall of the dewatering well 3 and the outer wall of the water absorption hot melting pipe 7, underground strong pressure water is isolated outside the first plugging area, the inner diameter of the dewatering well 3 is reduced, the plugging 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 optimized, and a plurality of dewatering wells 3 in one plugging unit are plugged simultaneously, so that the plugging efficiency of the whole dewatering well group can be increased by times, and the construction period is reduced;
the concrete backfill layer 14 is formed in the first plugging area in a one-step pouring mode, 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 the concrete backfill layers 14 in the plurality of dewatering wells 3 synchronously wait for solidification forming, so that the construction efficiency is high, the labor demand is low, and the construction cost is favorably reduced
By arranging the plugging sequences of the multiple dewatering well groups, the water pressure in the well during the 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 step four is as follows:
simultaneously plugging a plurality of dewatering wells 3 in the final plugging group 5, and plugging any dewatering well 3 in the final plugging group 5, wherein the specific process is as follows:
step 401, inserting two bound and fixed water absorption hot melt pipes 7 into the dewatering well 3, installing water stop valves 20 on the two bound and fixed water absorption hot melt pipes 7, respectively connecting the tops of the two water absorption hot melt pipes 7 with two self-priming water pumps 8, and forming a second plugging area between the two bound and fixed water absorption hot melt pipes 7 and the inner wall of the dewatering well 3; the two water-absorbing hot-melting pipes 7 bound and fixed together are marked 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 the water surface height in the dewatering well 3 to be below the top of the perforated section pipe section 10;
step 403, firstly, executing steps S3 to 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 to the position below the water stop valve 20 to form a concrete bottom backfill layer 21; laying an anti-seepage leaking stoppage layer 22 on the top of the concrete bottom backfill layer 21, continuously backfilling micro-expansive concrete on the top of the anti-seepage leaking stoppage layer 22 until the micro-expansive concrete is backfilled to the top of the through-bottom-plate casing pipe 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 through-bottom-plate casing pipe 13;
step 406, continuously pumping and draining water by using a 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 bottom backfill layer 21 and the concrete top backfill layer 23 to be solidified and formed; 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 shut down, the two water stop valves 20 are closed, the connection between the water-absorbing hot-melting tube group and the self-priming water pumps 8 is disconnected, and the part of the top of the water-absorbing hot-melting tube group, which is higher than the bottom plate sleeve 13, is cut off; and backfilling impervious cement and micro-expansion concrete in the water-absorbing hot-melting pipe group to form a hot-melting pipe top plugging layer 24; the top of the blocking layer 24 at the top of the hot melt pipe is flush with the top of the water absorption hot melt pipe 7;
step 407, 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.
It should be noted that, due to the blocking of the water stop valve 20, the bottom of the hot melt pipe top blocking layer 24 can only reach the top of the water stop valve 20, the water stop valve 20 blocks the water below the water absorption hot melt pipe 7, the water blocking below the water absorption hot melt pipe 7 can be strengthened after the hot melt pipe top blocking layer 24 is solidified, and the sealing steel plate 17 will not be leaked even if the water stop valve 20 leaks.
It should be noted that the water stop valve 20 is arranged at a position 40cm to 50cm below the top of the bottom plate casing 13, so that a constructor can conveniently stretch a hand into the bottom plate casing 13 to operate the water stop valve 20.
It should be noted that the anti-seepage and leak-stopping layer 22 is made of water-tight material.
In this embodiment, the thickness of the impervious leak-stopping layer 22 is not less than 10 cm.
In this embodiment, the blocking layer 24 on the top of the hot melt pipe is formed by solidifying the impermeable cement with the thickness not less than 100mm, which is poured into the water absorption hot melt pipe 7, and the micro-expansive concrete which is poured later.
In the embodiment, when the dewatering well 3 in the final plugging group 5 in the step four is plugged, the self-sucking water pumps 8 in the step two are installed in series, so that the water sucking and discharging power is doubled.
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 open hole segment 10 is 1/4L-1/3L.
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 crushed stones are hard round gravel materials with the 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.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a take precipitation well crowd shutoff construction method of forced water after ultra-deep subway station seals, distribute a plurality of construction sections along its length direction in ultra-deep subway station (1), all have a precipitation well group in every construction section, one precipitation well group is including a plurality of precipitation wells (3) of taking the forced water, the top of precipitation well (3) is provided with through bottom plate sleeve pipe (13), all precipitation wells (3) in ultra-deep subway station (1) constitute precipitation well crowd, its characterized in that, this method includes the following step:
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), recording the dewatering well group as an initial plugging group (4); the number of the initial plugging groups (4) is multiple, and the plugging sequence of the initial plugging groups (4) is arranged in sequence from large to small according to the average depth of the corresponding precipitation wells (3);
if the average depth of the dewatering wells (3) in one dewatering well group is the smallest and the dewatering well group is closest to the large mileage end of the ultra-deep subway station (1), recording the dewatering well group as a final plugging group (5);
marking the precipitation well groups except the initial plugging group (4) and the final plugging group (5) as an intermediate plugging group (6); the number of the middle plugging groups (6) is multiple, and the middle plugging groups (6) are sequentially plugged from a small mileage end of the ultra-deep subway station (1) to a large mileage end of the ultra-deep subway station (1);
step two, plugging of the initial plugging group:
simultaneously plugging a plurality of precipitation wells (3) in an initial plugging group (4), plugging any precipitation well (3) in the initial plugging group (4), and the specific process is as follows:
s1, inserting a water absorption hot melt pipe (7) into the precipitation well (3), forming a first blocking area between the inner wall of the precipitation well (3) and the outer wall of the water absorption hot melt pipe (7), enabling the bottom of the water absorption hot melt pipe (7) to be abutted against the bottom of the precipitation well (3), connecting the top of the water absorption hot melt pipe (7) with a self-priming pump (8), and uniformly forming a plurality of water absorption holes in the lower pipe section of the water absorption hot melt pipe (7); marking the pipe section provided with the water absorption holes on the water absorption hot melting pipe (7) as an open hole section pipe section (10); the length of the open hole section pipe section (10) is not more than 1/3L, wherein L is the well depth of the dewatering well (3) currently performing plugging operation;
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);
s3, uniformly backfilling crushed stones into the bottom of the first plugging area to form an annular crushed stone base layer (11) for stabilizing the bottom of the water-absorbing 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 open-hole section pipe section (10);
the position of the water absorption hot melt pipe (7) in the precipitation well (3) is adjusted 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 first 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);
s4, uniformly backfilling cement into the first blocking area, forming a cement leveling layer (12) on the top of the annular gravel 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 gravel base layer (11);
s5, uniformly backfilling micro-expansion concrete into the first plugging area until the micro-expansion concrete is backfilled into the bottom plate passing casing pipe (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 pipe (13);
s6, continuously pumping and draining water by a 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;
s7, after the concrete backfill layer (14) is solidified and formed, stopping the self-priming pump (8), disconnecting the water-absorbing hot-melting pipe (7) from the self-priming pump (8), cutting off the part of the top of the water-absorbing hot-melting pipe (7) higher than the bottom plate sleeve (13), rapidly filling water-swelling water-stop glue and cement into the water-absorbing hot-melting pipe (7) in sequence, forming a swelling water-stop layer (15) by the water-swelling water-stop glue, and forming a cement seal pipe layer (16) by the cement backfilled in the water-absorbing hot-melting pipe (7); the top of the cement pipe sealing layer (16) is flush with the top of the water absorption hot melt pipe (7);
s8, welding a sealing steel plate (17) at the top of the through-bottom-plate sleeve (13), 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 upper surface of the bottom plate (19);
step three, plugging the middle plugging group:
sequentially plugging 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); simultaneously plugging a plurality of dewatering wells (3) in any one middle plugging group (6), wherein the specific process is the same as that from the step S1 to the step S8;
and step four, increasing the water absorption and drainage amount of the dewatering well in the final plugging group, and plugging the final plugging group.
2. The plugging construction method for the precipitation well group with the pressurized water after the ultra-deep subway station is sealed according to claim 1, characterized in that: the concrete process of the step four is as follows:
simultaneously plugging a plurality of dewatering wells (3) in the final plugging group (5), and plugging any dewatering well (3) in the final plugging group (5), wherein the specific process is as follows:
step 401, inserting two water absorption hot melt pipes (7) which are bound and fixed together into a precipitation well (3), installing water stop valves (20) on the two water absorption hot melt pipes (7) which are bound and fixed together, respectively connecting the tops of the two water absorption hot melt pipes (7) with two self-priming water pumps (8), and arranging a second plugging area between the two water absorption hot melt pipes (7) which are bound and fixed together and the inner wall of the precipitation well (3); recording two water-absorbing hot-melting pipes (7) bound and fixed together as a water-absorbing hot-melting pipe group; the distance between the water stop valve (20) and the top of the sleeve (13) passing through the bottom plate is 40-50 cm;
step 402, opening two water stop valves (20), starting two self-priming water pumps (8), and pumping and discharging the water surface height in the dewatering well (3) to be below the top of the perforated section pipe section (10);
step 403, firstly, executing steps S3 to S4, and fixing the bottom of the water absorption hot melt pipe group, wherein the axis of the water absorption hot melt pipe group is superposed 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 to the position below the water stop valve (20) to form a concrete bottom backfill layer (21); laying an anti-seepage leaking stoppage layer (22) on the top of the concrete bottom backfill layer (21), continuously backfilling micro-expansion concrete on the top of the anti-seepage leaking stoppage layer (22) until the micro-expansion concrete is backfilled to the top of the through-bottom-plate casing pipe (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 through-bottom-plate casing pipe (13);
step 406, continuously pumping and draining water by using a 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 bottom backfill layer (21) and the concrete top backfill layer (23) to be solidified and formed; 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 shut down, the two water stop valves (20) are closed, the connection between the water-absorbing hot-melting tube group and the self-priming water pumps (8) is disconnected, and the part of the top of the water-absorbing hot-melting tube group, which is higher than the bottom plate sleeve (13), is cut off; and backfilling impervious cement and micro-expansion concrete in the water absorption hot melting pipe group to form a hot melting pipe top plugging layer (24); the top of the blocking layer (24) at the top of the hot melting pipe is flush with the top of the water absorption hot melting pipe (7);
and 407, welding a sealing steel plate (17) on the top of the through-bottom-plate sleeve (13), 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).
3. The plugging construction method for the precipitation well group with the pressurized water after the ultra-deep subway station is sealed according to 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).
4. The plugging construction method for the precipitation well group with the pressurized water after the ultra-deep subway station is sealed according to claim 1, characterized in that: the length of the open hole section pipe section (10) is 1/4L-1/3L.
5. The plugging construction method for the precipitation well group with the pressurized water after the ultra-deep subway station is sealed according to claim 1, characterized in that: the bottom and the outer side of the open section pipe section (10) are wrapped by filter screens.
6. The plugging construction method for the precipitation well group with the pressurized water after the ultra-deep subway station is sealed according to claim 1, characterized in that: the gravel is hard round gravel with the particle size of 4-15 mm.
7. The plugging construction method for the precipitation well group with the pressurized water after the ultra-deep subway station is sealed according to claim 1, characterized in that: the height ratio of the expansion water-stop layer (15) to the cement pipe sealing layer (16) is 1: 2.
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