CN213390192U - Suspension type dewatering system for foundation pit - Google Patents
Suspension type dewatering system for foundation pit Download PDFInfo
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- CN213390192U CN213390192U CN202021854243.9U CN202021854243U CN213390192U CN 213390192 U CN213390192 U CN 213390192U CN 202021854243 U CN202021854243 U CN 202021854243U CN 213390192 U CN213390192 U CN 213390192U
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Abstract
The utility model provides a foundation ditch suspension type precipitation system. The dewatering system comprises a suspension type waterproof curtain arranged outside the peripheral side wall of the foundation pit and a plurality of dewatering wells arranged in the foundation pit, the bottom of a filter pipe of each dewatering well does not exceed the depth of the waterproof curtain, and the top surface of each dewatering well is arranged below the bottom surface of the foundation pit; and a plurality of recharge wells and water level observation wells are arranged on the outer side of the suspended waterproof curtain, and the recharge wells are distributed on one side or a plurality of sides of the foundation pit where the building is arranged. The utility model discloses can realize safe, reliable precipitation to the complicated foundation ditch of geological conditions and all ring edge borders, avoid gushing water, quicksand and the foundation ditch outward appearance that appear among the foundation ditch excavation process and subside the scheduling problem, and the precipitation in-process has reduced the harmful effects to surrounding environment, can be applicable to the condition that foundation ditch retaining structure adopted suspension type stagnant water curtain.
Description
Technical Field
The utility model relates to a foundation ditch precipitation engineering, in particular to foundation ditch suspension type precipitation system.
Background
The foundation pit precipitation can make working faces such as foundation pit excavation, support be in dry state to have and avoid foundation pit hole bottom gushing water and reduce numerous advantages such as foundation pit lateral wall water pressure, nevertheless because foundation pit precipitation receives many factors to influence, design and construction of solid its scheme all have very big degree of difficulty and uncertainty.
When meeting the circumstances that all there are soil layers such as thick silt, silt in station main part foundation ditch excavation within range and below the bottom plate, because the soil property is inhomogeneous, permeability and water content are great, if precipitation handles improperly, easily produces phenomenons such as quicksand, piping, collapse when the foundation ditch excavation. Particularly, in some special projects, due to local loss of a water-resisting layer, a suspended water-stopping curtain is adopted, a diving aquifer and a confined water aquifer are mutually communicated, an underground continuous wall cannot separate the aquifer inside and outside a foundation pit, and once the water-stopping curtain leaks underground water inside and outside the foundation pit under the condition of large water head difference, risks such as piping, quicksand and the like can occur; when the water level outside the pit is reduced or the ground surface subsides beyond the allowable range, adverse effects can be caused to the surrounding environment, and particularly, the surrounding buildings can directly cause the subsidence of the building ground, so that the stability of the building is influenced. And in the case of complex conditions around the foundation pit, once the water-resisting effect of the enclosure structure on the upper aquifer is not ideal, the underground water in the pit is pumped and dropped, so that the synchronous change of the underground water outside the pit is caused, the ground settlement of the environment outside the pit is aggravated, and the social influence is extremely bad.
Disclosure of Invention
The utility model discloses to prior art's not enough, provide a foundation ditch suspension type precipitation system, this precipitation system can carry out fine precipitation to the foundation ditch of the condition of soil layers such as the thick silt, silt below the bottom plate, and its precipitation process influences little to the surrounding environment.
In order to solve the technical problem, the utility model provides a foundation ditch suspension type precipitation system, its characterized in that: the dewatering system comprises a suspension type waterproof curtain arranged outside the peripheral side wall of the foundation pit and a plurality of dewatering wells arranged in the foundation pit, the bottom of a filter pipe of each dewatering well does not exceed the depth of the waterproof curtain, and the top surface of each dewatering well is arranged below the bottom surface of the foundation pit; and a plurality of recharge wells and water level observation wells are arranged on the outer side of the suspended waterproof curtain, and the recharge wells are distributed on one side or a plurality of sides of the foundation pit where the building is arranged.
The utility model discloses further technical scheme: the suspension type waterproof curtain is a waterproof curtain with the periphery closed and the bottom not closed.
The utility model discloses further technical scheme: the dewatering well, the recharge well and the water level observation well sequentially comprise a solid pipe, a filter pipe and a sedimentation pipe from top to bottom, and the dewatering well filter pipe is positioned in the fine sand layer below the bottom of the foundation pit; the depth of the bottom of the recharge well filter tube and the bottom of the observation well filter tube are larger than that of the precipitation well filter tube, the top of the recharge well filter tube and the bottom of the observation well filter tube are higher than the bottom surface of the foundation pit, and the top surface of the observation well filter tube is higher than that of the recharge well filter tube.
The utility model discloses better technical scheme: the arrangement interval of the dewatering wells is 12-20 m, and the average water inflow of each well is 6-12 m3And h, the top of the dewatering well filter tube is located 1-2 m below the bottom surface of the foundation pit.
The utility model discloses better technical scheme: the arrangement interval of the recharging wells is 15-25 m, and the average recharging amount of a single well is 2-3 m3The recharge pressure is 0.07-0.08 MPa; the arrangement distance of the water level observation wells is 35-45 m.
The utility model discloses further technical scheme: and a first filter material layer, a water stop material layer and a concrete pouring layer are sequentially arranged on the periphery of a well pipe of the recharging well from bottom to top, and the height of the first filter material layer is higher than that of a filtering pipe of the recharging well.
The utility model discloses further technical scheme: and a second filter material layer and a first filling layer are sequentially arranged on the periphery of a well pipe of the water level observation well from bottom to top, and the height of the second filter material layer is higher than that of a filter pipe of the observation well.
The utility model discloses further technical scheme: and a third filter material layer and a second fill layer are sequentially arranged on the periphery of the well pipe of the dewatering well from bottom to top, and the third filter material layer is higher than the ground elevation.
The utility model has the advantages that:
(1) the utility model can realize safe and reliable precipitation aiming at the foundation pit with complex geological condition and surrounding environment, and avoid the problems of water gushing, sand flowing, foundation pit surface settlement and the like in the excavation process of the foundation pit;
(2) the utility model discloses adopt suspension type precipitation well in the hole, the filter of its precipitation well is no longer than the degree of depth of water proof curtain, the groundwater of aquifer flows into in the people's well through water proof curtain bottom after the crowd's well draws water, because the groundwater flow increases, the water conservancy slope diminishes, when the groundwater level of aquifer roof department reaches the design depth of fall in the foundation ditch within range, the volume of drawing water will be less than the outer precipitation of hole, the artesian head drop outside the hole is little, the environmental impact to the outer cause of precipitation of hole is little, make the advantage of the interior precipitation of hole fully play, this precipitation mode can be fine be applied to because the disappearance of bottom water proof layer, therefore the special condition that dive layer and artesian water layer communicate carries out precipitation, and can be applicable to the condition that the foundation ditch envelope adopts suspension type water;
(3) the utility model discloses be equipped with recharging well and observation well outside the foundation ditch, because what set up in the hole is suspension type precipitation well, therefore can not avoid bringing the decline of the outer water level of hole when the interior precipitation of hole, the dive observation well outside the hole can strengthen the daily monitoring of the interior outer flood peak of hole at precipitation operation in-process, in case envelope is not good to the water proof effect of upper portion aquifer, lead to the outer water level of hole to descend or the earth's surface subsides and exceed the allowed band, alright take recharging measure, reduce the harmful effects to the surrounding environment.
Drawings
Fig. 1 is a schematic plan view of the present invention;
figure 2 is a cross-sectional view of the wellbore of the present invention.
In the figure: 1-suspended water-stop curtain, 2-dewatering well, 200-dewatering well filter tube, 201-third filter material layer, 202-second filler layer, 3-recharging well, 300-recharging well filter tube, 301-first filter material layer, 302-water-stop material layer, 303-concrete pouring layer, 4-foundation pit, 5-water level observation well, 500-observation well filter tube, 501-second filter material layer, 502-first filler layer, 6-foundation pit bottom surface, 7-building and 8-fine sand layer.
Detailed Description
The present invention will be further explained with reference to the drawings and examples. Fig. 1 to 2 are drawings of the embodiment, which are drawn in a simplified manner and are only used for clearly and concisely illustrating the purpose of the embodiment of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
The embodiment provides a foundation ditch suspension type precipitation system, as shown in fig. 1 and 2, include the suspension type waterproof curtain 1 that sets up outside the lateral wall around foundation ditch 4 and set up a plurality of precipitation well 2 in foundation ditch 4, suspension type waterproof curtain 1 is the waterproof curtain of enclosing all around and the bottom is not enclosed. A plurality of recharging wells 3 and water level observation wells 5 are arranged on the outer side of the suspended waterproof curtain 1, and the recharging wells 3 are distributed on one side or multiple sides of the foundation pit 4 where the building 7 is arranged. The arrangement interval of the dewatering wells 2 is 12-20 m, and the average water inflow of a single well is 6-12 m3H, the arrangement interval of the recharging wells 3 is 20m, and the average recharging amount of a single well is 2.5m3The recharging pressure is 0.08 MPa; the arrangement distance of the water level observation wells 5 is 35-45 m.
The embodiment provides a foundation pit suspension type dewatering system, as shown in fig. 2, the dewatering well 2, the recharge well 3 and the water level observation well 5 sequentially comprise a solid pipe, a filter pipe and a sedimentation pipe from top to bottom, the bottom of the filter pipe of the dewatering well 2 does not exceed the depth of a suspension type waterproof curtain 1, the top surface of the dewatering well is arranged at a position 1-2 m below the bottom surface 6 of a foundation pit, and the dewatering well filter pipe 200 is positioned in a fine sand layer 8 below the bottom of the foundation pit; the depth of the bottom of the recharging well filter pipe 300 and the bottom of the observation well filter pipe 500 are larger than that of the dewatering well filter pipe 200, the top of the recharging well filter pipe 300 and the top of the observation well filter pipe 500 are higher than the bottom surface of the foundation pit by more than 6 degrees, and the top surface of the observation well filter pipe 500 is higher than that of the recharging well filter pipe 300. The periphery of a well pipe of the recharging well 3 is sequentially provided with a first filter material layer 301, a water stop material layer 302 and a concrete pouring layer 303 from bottom to top, and the height of the first filter material layer 301 is higher than that of the recharging well filter pipe 300. A second filter material layer 501 and a first filling layer 502 are sequentially arranged on the periphery of a well pipe of the water level observation well 5 from bottom to top, and the height of the second filter material layer 501 is higher than that of the filter pipe 500 of the observation well. The well casing periphery of dewatering well 2 is equipped with third filter material layer 201 and second fill layer 202 from supreme down in proper order, third filter material layer 201 is higher than ground elevation.
The utility model discloses it is right to combine specific embodiment below further to explain, the embodiment is to certain project section of certain track traffic first-stage engineering in south leads to the city, and the station of this project section is the underground two-layer station of 12m island platform, establishes 4 access & exit and 2 groups of bleachers altogether, and wherein No. 3 access & exit are reserved. The station outer envelope has a total length of 223.60m and a width of about 20.7 m. SK29+766.800, the design demarcation mileage of the small mileage end well and the shield interval is: SK29+618.400, the design demarcation mileage of the end well of the big mileage and shield interval is: SK29+ 840.400. According to the existing construction site conditions, the station is constructed by adopting an open cut down-cut construction method, the construction sequence comprises the steps of constructing the station main body, starting and receiving the shield, and finally constructing the remaining auxiliary structures. The excavation depth of the standard section foundation pit is 16.66m, the excavation depth of the west end well foundation pit is 18.56m, and the excavation depth of the east end well foundation pit is 18.11 m. The safety level of the foundation pit is one level, and the environmental protection level is two levels. According to the engineering characteristics, geological conditions, traffic organization and environmental protection requirements of the station, the building enclosure structure selects 800-thick underground continuous walls, and joints of the underground continuous walls are all made of I-steel. The standard section is provided with four supports, the end well section is provided with four supports and one support replacing support, wherein the first support is a concrete support, and the rest supports are steel supports. The depth of underground walls of a station standard section and an end well is 35m, and the insertion ratio of a reinforcing bar section of the standard section is about 0.80; the end well rebar section insertion ratio is about 0.79.
The bottom of a foundation pit of the station is positioned in three-2 layers of silt layers, a sandy soil layer is taken as a main part in the excavation depth, and the excavation depth sequentially comprises a first layer of filling soil, a second layer of sandy silt, a third-1 layer of silt and sand-sandwiched sandy silt and a third-2 layers of silt; the foundation pit bottom plate surface is sequentially provided with three-2 layers of silt, three-4 layers of fine silt, four-2 layers of silty clay and sandy silty soil interbedded layers (15-28 shaft missing) and six layers of silt. The standard section and the toe of the underground wall of the end well are inserted into the three-4 layers of fine sand layers. According to stratum structure and occurrence conditions of underground water disclosed by investigation and by combining with regional hydrogeological data, the types of the underground water which has influence on the work point are mainly diving and I-th confined water, the confined water of the stratum is mainly caused to exist in a silty sand layer below a fourth layer to a fourth layer, the main supply source is the lateral supply of the underground water, and the discharge path is artificial mining and underground water lateral runoff. And fourthly, 2 layers of silty clay and sandy silty soil are mutually layered to be regarded as relative water barriers, 15-28 shafts of the line of the section of line IV-2 are lacked, and the diving water-bearing layer and the confined water-bearing layer are mutually communicated to form a suspended water-stopping curtain.
In order to avoid the occurrence of the excavation process of the foundation pitThe normal excavation of foundation ditch is influenced by the phenomenon of water inrush and settlement, so the precipitation system of the utility model is adopted in the project, as shown in figure 1 specifically, 32 precipitation wells 2 are distributed in the foundation ditch 4, the aperture of the precipitation deep well is 550mm, the outer diameter of the well pipe and the filter is 273mm, the well depth of the precipitation well is 29-32 m, and the filter is mainly positioned at the fine sand layer-2 to be used as a complete well of the layer; three wells in the 32 dewatering wells 2 are used as a dual-purpose well for observing water level in the foundation pit; wherein the depth of 18 wells is 29m, the length of the end well filter is 8m, and the length of the standard section filter is 9 m; the depth of another 11 wells is 32m, the length of the end well filter is 11m, and the length of the standard section filter is 12 m. Arranging a diving water level observation well 5 at the position of 40 m/opening of the foundation pit 4, wherein the well depth is 32m, and the position of a filter pipe is 5-31 m; distributing recharging wells 3 with the depth of 32m and the filter of 21m at the south and north sides outside the foundation pit 4 according to the depth of 20 m/opening, arranging the recharging wells as close to the protective building as possible and far away from a water pumping center, and recharging at the later stage by adopting the recharging pressure of 0.08 MPa. Average water inflow amount of single well in pit is 6-12 m3Per hour, the average recharging quantity of the single well of the recharging well outside the pit is 2.5m3/h。
The utility model discloses a suspension type precipitation well's filter tube does not set up more than the hole bottom in the hole, need not carry out "along with digging along with cutting" during the operation, increases the time of drawing water in advance as far as possible.
Adopt the utility model provides a precipitation system carries out precipitation to this engineering, because the water proof curtain part of foundation ditch fails to insert the water barrier completely, the inside and outside water layer of foundation ditch intercommunication. But the foundation pit waterproof curtain cuts off the water-bearing stratum of the precipitation purpose, the precipitation in the pit is adopted to be more preferred, the filter of the pressure reduction well does not exceed the depth of the waterproof curtain, namely 'suspension type precipitation', the groundwater of the water-bearing stratum flows into the manhole through the bottom of the waterproof curtain after the water pumping of the group well, the hydraulic gradient is reduced due to the increase of the groundwater flow, and the pumping amount is smaller than that of the precipitation outside the pit when the groundwater level at the top plate of the water-bearing stratum in the foundation pit reaches the designed depth reduction. The drop of the confined water head outside the pit is small, the environmental influence caused by precipitation outside the pit is small, and the advantage of precipitation in the pit is fully exerted.
The above description is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. The utility model provides a foundation ditch suspension type precipitation system which characterized in that: the dewatering system comprises a suspension type waterproof curtain (1) arranged outside the peripheral side wall of the foundation pit (4) and a plurality of dewatering wells (2) arranged in the foundation pit (4), the bottoms of filter tubes of the dewatering wells (2) do not exceed the depth of the suspension type waterproof curtain (1), and the top surfaces of the dewatering wells are arranged at positions below the bottom surface (6) of the foundation pit; a plurality of recharge wells (3) and water level observation wells (5) are arranged on the outer side of the suspended waterproof curtain (1), and the recharge wells (3) are distributed on one side or multiple sides of the foundation pit (4) where the building (7) is arranged.
2. The foundation pit suspended precipitation system of claim 1, wherein: the suspension type waterproof curtain (1) is a waterproof curtain with the periphery closed and the bottom not closed.
3. The foundation pit suspended precipitation system of claim 1, wherein: the dewatering well (2), the recharge well (3) and the water level observation well (5) sequentially comprise a solid pipe, a filter pipe and a sedimentation pipe from top to bottom, wherein the dewatering well filter pipe (200) is positioned in a fine sand layer (8) below the bottom of a foundation pit; the depth of the bottom of the recharging well filter pipe (300) and the bottom of the observation well filter pipe (500) are larger than that of the dewatering well filter pipe (200), the top of the recharging well filter pipe is higher than the bottom surface (6) of the foundation pit, and the top surface of the observation well filter pipe (500) is higher than that of the recharging well filter pipe (300).
4. The foundation pit suspended precipitation system of claim 1, wherein: the arrangement interval of the dewatering wells (2) is 12-20 m, and the average water inflow of each well is 6-12 m3And h, the top of the dewatering well filter tube (200) is located 1-2 m below the bottom surface of the foundation pit (4).
5. According to claim 1The foundation pit suspension type precipitation system is characterized in that: the arrangement interval of the recharging wells (3) is 15-25 m, and the average recharging amount of a single well is 2-3 m3The recharge pressure is 0.07-0.08 MPa; the arrangement distance of the water level observation wells (5) is 35-45 m.
6. The foundation pit suspended precipitation system of claim 3, wherein: the periphery of a well pipe of the recharging well (3) is sequentially provided with a first filter material layer (301), a water stop material layer (302) and a concrete pouring layer (303) from bottom to top, and the height of the first filter material layer (301) is higher than that of a recharging well filter pipe (300).
7. The foundation pit suspended precipitation system of claim 3, wherein: and a second filter material layer (501) and a first filling layer (502) are sequentially arranged on the periphery of a well pipe of the water level observation well (5) from bottom to top, and the height of the second filter material layer (501) is higher than that of the filter pipe (500) of the observation well.
8. The foundation pit suspended precipitation system of claim 3, wherein: the well casing periphery of precipitation well (2) is equipped with third precoat (201) and second fill layer (202) from supreme down in proper order, third precoat (201) are higher than ground elevation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021854243.9U CN213390192U (en) | 2020-08-31 | 2020-08-31 | Suspension type dewatering system for foundation pit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021854243.9U CN213390192U (en) | 2020-08-31 | 2020-08-31 | Suspension type dewatering system for foundation pit |
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