CN219100101U - Foundation pit dewatering well structure suitable for interaction condition of weakly permeable layer and sand layer - Google Patents
Foundation pit dewatering well structure suitable for interaction condition of weakly permeable layer and sand layer Download PDFInfo
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- CN219100101U CN219100101U CN202223233897.1U CN202223233897U CN219100101U CN 219100101 U CN219100101 U CN 219100101U CN 202223233897 U CN202223233897 U CN 202223233897U CN 219100101 U CN219100101 U CN 219100101U
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Abstract
The utility model relates to the field of building construction, in particular to a foundation pit dewatering well structure suitable for a weakly permeable layer and sand layer interaction condition. The foundation pit dewatering well structure comprises a submersible pump and is characterized by comprising a buried well, a well cover, a well pipe, a drain pipe and a one-way valve; the buried well is arranged between the ground and a preset concrete foundation, and a hollow cavity is formed, and the well cover is arranged on the ground so as to cover the cavity; the well pipe is arranged on the concrete foundation; the drain pipe is communicated with a pump pipe of the submersible pump through the one-way valve, and the pump pipe is arranged in the well pipe, so that underground water pumped by the submersible pump can flow into a municipal pipe network after passing through a preset sedimentation tank. Therefore, the problems that the current artificial deep foundation pit is easy to cause piping and sand damage, poor in stability and easy to collapse on the ground due to groundwater seepage are solved.
Description
Technical Field
The utility model relates to the field of building construction, in particular to a foundation pit dewatering well structure suitable for a weakly permeable layer and sand layer interaction condition.
Background
The foundation pit dewatering is that when the foundation pit is excavated, the groundwater level is higher than the bottom surface of the excavation, and the groundwater can continuously infiltrate into the pit, so that the foundation pit can be constructed under the dry condition, and dewatering work caused by instability of a side slope, foundation sand, pit bottom uplift, foundation pit piping and bearing capacity reduction of a foundation is prevented. The dewatering well is a well for lowering the groundwater level, and is filled with a water pump to pump groundwater after the well is filled, so that the groundwater level is lowered, and the water outside the pit is prevented from carrying soil body to flow into the pit in the process of pit excavation, thereby causing the sinking of the road around the pit, the damage of surrounding pipelines and instability.
But the adverse effect on the surrounding environment of the foundation pit is not ignored. The primary influencing factors are peripheral engineering geological conditions, the rock-soil layering types are multiple and are mostly cohesive soil, weathered mudstone is a weak permeable layer, and when the primary influencing factors are sand soil layers, drainage work is performed during construction. Under the action of underground water, the pit wall is easy to collapse, so that the instability of the pit wall is increased, and the construction of underground engineering is directly influenced.
Due to the requirement of urban engineering construction, complex manual filling is left behind. The soil structure is loose and uneven, the mechanical property difference is larger, the stability is poor, if rain and sewage pipelines leak, the holes are easy to form, and the ground collapse is easy to be caused after the disturbance of the excavated construction stratum. In addition, the mauve mudstone is widely distributed in the field range, the thickness is large, and the locally thin-layer sandstone mudstone and sandstone have the properties of softening in water, disintegrating, dehydrating, hardening and cracking. The strength is reduced after softening or dry cracking, if the support is not carried out in time, collapse can occur; the weathered sandy sandstone is easy to collapse, and fine particles are easy to run off under the action of water, so that the safety of the whole foundation pit is endangered.
Therefore, aiming at the problems of easy piping, sand damage, poor stability and easy ground collapse existing in the current artificial foundation pit, a more reasonable technical scheme is required to be provided so as to solve the technical problems existing at present.
Disclosure of Invention
The utility model aims to provide a foundation pit dewatering well structure suitable for a condition of interaction between a weakly permeable layer and a sand layer, so as to solve the problems that the existing artificial foundation pit is easy to cause piping and sand damage, poor in stability and easy to cause ground collapse.
In order to achieve the above purpose, the utility model provides a foundation pit dewatering well structure suitable for the interaction condition of a water-permeable layer and a sand layer, which comprises a submersible pump, a buried well, a well cover, a well pipe, a drain pipe and a one-way valve;
the buried well is arranged between the ground and a preset concrete foundation, a hollow cavity is formed in the buried well, a well ring is arranged on the ground, and the well cover is arranged on the well ring so as to cover the cavity; the well pipe is arranged on the concrete foundation;
the drain pipe is communicated with a pump pipe of the submersible pump, and a one-way valve is arranged on the pump pipe;
the pump pipe is arranged in the well pipe, so that underground water pumped by the submersible pump can flow into a municipal pipe network after passing through a preset sedimentation tank.
In one possible embodiment, the well tubular comprises a tubular body having a storage cavity for receiving the filter body, and a filter body, wherein the filter body comprises a plurality of stacked crushed stones.
In one possible embodiment, the crushed stone has a particle size of 3 to 7mm.
In one possible embodiment, the crushed stone has a particle size of 4mm.
In one possible embodiment, the drain line is buried underground, and the slope of the drain line is 5% or more.
In a possible embodiment, the buried well is sized to satisfy a total water inflow Q, where the total water inflow Q is calculated according to the formula:
Q＝A·M 1 ·μ；
a is the area of a foundation pit;
M 1 the thickness of the aquifer is the thickness of the lyophobic aquifer;
μ is the water cut of the aquifer.
In a possible embodiment, the length of the well pipe is y 0 ，y 0 ＝[H 2 -0.732Q/k×(lgR 0 -lgnr 0 n- 1 r w )/n] 1/2 ；
l is the water inlet length of the filter body of the well pipe;
r 0 the equivalent radius of the foundation pit;
r w is the radius of the pipe well;
h is the thickness of the diving aquifer;
R 0 the sum of the equivalent radius of the foundation pit and the influence radius of the dewatering well is obtained;
R 0 ＝R+r 0 ；
and R is the influence radius of the precipitation well.
In one possible embodiment, the sedimentation tank comprises a tank body and a cover plate arranged on the tank body, a pump pipe of the submersible pump is communicated with the tank body for guiding groundwater, and the other end of the tank body is communicated with a municipal pipe network;
the height of the water outlet of the pump pipe is higher than that of the water inlet of the municipal pipe network.
In one possible embodiment, a blocking wall is arranged in the tank body, the height of the blocking wall is higher than the height of the water inlet of the municipal pipe network, and the height of the blocking wall is lower than the height of the water outlet of the pump pipe.
Through above-mentioned technical scheme, solved complicated stratum precipitation incomplete problem, this foundation ditch precipitation well structure is little to surrounding environment influence to structural strength and factor of safety are high, with low costs, drainage effect is good, thereby avoided foundation ditch peripheral road subsidence, peripheral pipeline destroy and foundation ditch unstability scheduling problem. When the foundation pit dewatering well structure is applied, groundwater impurities can be filtered or precipitated to a certain extent, so that the pipe is prevented from being blocked by particles.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a precipitation well according to an embodiment of the present utility model;
FIG. 2 is a schematic cross-sectional view of a buried wellhead illustrating an embodiment of the present utility model;
FIG. 3 is a schematic cross-sectional view of a surface wellhead illustrating an embodiment of the present utility model;
FIG. 4 is a schematic cross-sectional view showing a sedimentation tank according to an embodiment of the present utility model;
FIG. 5 is a schematic cross-sectional view of a shallow buried well illustrating an embodiment of the present utility model.
In the above figures: 11-immersible pump, 12-pump pipe, 2-buried well, 31-well lid, 32-well ring, 4-well pipe, 41-body, 42-filter, 5-drain pipe, 6-check valve, 7-well support, 8-hoist cable, 91-concrete foundation, 92-municipal pipe network, 93-pool body, 94-apron, 95-blocking wall.
Detailed Description
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the present utility model will be briefly described below with reference to the accompanying drawings and the description of the embodiments or the prior art, and it is obvious that the following description of the structure of the drawings is only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
The technical solution provided by the present utility model will be described in detail by way of examples with reference to the accompanying drawings. It should be noted that the description of these examples is for aiding in understanding the present utility model, but is not intended to limit the present utility model.
According to the specific embodiment of the disclosure, a foundation pit dewatering well structure suitable for the interaction condition of a weakly permeable layer and a sand layer is provided. Wherein fig. 1-5 illustrate one specific embodiment.
The foundation pit dewatering well structure suitable for the interaction condition of the weakly permeable layer and the sand layer is prepared by the following steps:
s100, well position lofting; the well location should be carried out by professional measuring staff, the well location should be provided with a significant mark, and if necessary, a steel drill rod is adopted to drive into the ground for 300mm.
S200: pipeline digging is carried out at the well site to clear down-hole obstacles, the pipeline digging depth is not less than 6m, and a protective cylinder is required to be arranged when the soil of the wellhead is loose, so that the collapse of the orifice caused by slurry soaking and scouring is avoided.
S300: and (3) forming holes, namely forming holes in a pipe well by adopting a reverse circulation drilling machine, and forming slurry and protecting walls of the stratum. The diameter of the well is not less than 600mm, the well hole is kept right vertical, and the actual drilling depth is more than 300-500 mm than the designed well depth.
S400: changing slurry, injecting clear water to replace slurry before well pipe is put in, and pumping out sediment by using water pump or sand-pumping pipe to make the slurry density in well be 1.05-1.10 g/cm 3 。
S500: the well pipe is installed by adopting a five-sand concrete pipe, the well pipe is placed on a concrete prefabricated support, a middle guide is arranged in the middle of the bottom, 8 iron wires are tied around the well pipe, the well pipe is connected under the well pipe slowly, when the pipe orifice is 200mm different from a wellhead, all the well pipe is wrapped by nylon yarns, the specification of a filter screen is 100 meshes, so that the well pipe is prevented from being blocked by mud sand, and the well pipe is vertically fixed by 2-4 bamboo strips with the width of 30 mm. To prevent dislocation of the upper and lower sections, the well pipe is erected in the direction before being lowered. The tubular is suspended vertically and held in the wellbore.
S600: backfilling the filter material, hoisting the well pipe in place, and uniformly filling the broken stone along the periphery of the well pipe by using a spade even if the filter material is filled in the water-containing layer section, so as to prevent the overhead, and ensuring that the filling is not less than 95% of the filling amount calculated by design.
S700: flushing, after completion of the well, with compressed air (pressure 0.84MPa, displacement 12m 3 /min) is combined with a submersible pump 11. The sewage pump can be used for repeatedly recovering 2 times of pumping and washing, and the pumping and washing times are not less than 6 times. The well flushing is carried out within 4-8 hours after the well is completed, so that the situation that the mud skin of the retaining wall is aged gradually and is difficult to damage and the water seepage effect is affected is avoided.
S800: the submerged pump is installed, the submerged pump 11 is suspended by a sling 8 (an insulating material rope), and a well support 7 is arranged below the submerged pump to help the submerged pump to smoothly descend. And installing and switching on a power supply, paving a cable and an electric switch box, achieving a single-well single-control power supply, and installing a time water level relay automatic water pumping device and a leakage protection system.
S900: the drainage pipe 5 net is paved, the drainage pipe 5 with phi of 200mm is buried along the inner wall of the blind well, the hydraulic gradient is 5 per mill, when the drainage pipe is buried in the underground with the depth less than 1.7m, the winter heat preservation measures are considered, and the drainage water is discharged into a water inlet after flowing through a three-level sedimentation tank from a water collecting main pipe.
S1000: pumping down, networking pumping down, pumping down continuously, not interrupting midway, and maintaining the water pump and the well pipe one by one. When the water is pumped, the water pumps can be started one by one at intervals to prevent the insufficient drainage capacity of the drainage pipe 5 due to the large water pumping quantity. After water pumping starts, a water pumping test is performed to check the water yield, sand yield and water content permeability coefficient of a single well. When the sand output is too large, the water pump can be lifted up, and if the sand output is still large, the well should be re-washed or stopped for well repair.
S1200: and (3) observing the water level, wherein water level observation holes are arranged at each station. The static water level should be observed before pumping, the water level should be observed 2 times a day (once a week) at the initial stage of pumping (once a week each morning and evening), and 1 time a day after the water level is stabilized (after a week). After the foundation pit structure is excavated to the bottom, observing for 1 time every week until the foundation construction is completed. Observation frequency in special cases: and (3) enhancing observation under special conditions such as during rainy season and after rain, wherein the observation is carried out for more than 2 times per day until the special conditions are finished.
S1300: pumping down and maintenance, the field guarantee has not less than 10 reserve water pumps, and the field precipitation personnel must even change to the water pump that can not normally work, guarantees pumping down effect. The river staff is on duty in two shifts, and 1 person is on duty.
S1400: plugging, after the use purpose of the downcomer well is completed, firstly cutting off the electricity for pumping water and dismantling the underground water pump, the cable and the pump pipe. To prevent contamination of the diving of the lower layer, the wellhead is backfilled with clay to 2.0 m. C15 plain concrete is adopted for backfilling more than 2.0 from the wellhead, and manual tamping is adopted. The near-surface portion is restored in situ. The concrete should be backfilled 3 days after backfilling the stone chips.
Through the technical scheme, the prepared foundation pit dewatering well structure solves the problem of incomplete dewatering of complex stratum, has small influence on surrounding environment, high structural strength, high safety coefficient, low cost and good drainage effect, and further avoids the problems of sinking of roads around the foundation pit, damage to peripheral pipelines, instability of the foundation pit and the like.
The foundation pit dewatering well structure suitable for the interaction condition of the weakly permeable layer and the sand layer is shown in the figures 1 to 5, and comprises a submerged pump 11, a buried well 2, a well cover 31, a well pipe 4, a water drain pipe 5 and a one-way valve 6; the buried well 2 is arranged between the ground and a preset concrete foundation 91, and is provided with a hollow cavity, and the ground is provided with the well cover 31 so as to cover the cavity; the well pipe 4 is arranged on the concrete foundation; the drain pipe 5 is communicated with a pump pipe of the submersible pump 11 through the one-way valve 6, and the pump pipe is arranged in the well pipe 4, so that groundwater pumped by the submersible pump 11 can flow into the municipal pipe network 92 after passing through a preset sedimentation tank.
Through the technical scheme, a stable and reliable groundwater pumping and draining system can be formed, the problem of incomplete precipitation of complex stratum is solved, the foundation pit precipitation well structure has small influence on the surrounding environment, the structural strength and the safety coefficient are high, the cost is low, the drainage effect is good, and the problems of sinking of roads around the buried well 2, damage to surrounding pipelines and the like are avoided. When the foundation pit dewatering well structure is applied, groundwater impurities can be filtered or precipitated to a certain extent, so that the pipe is prevented from being blocked by particles.
In one embodiment, the well tubular 4 comprises a tubular body having a storage cavity receiving the filter body 42 and a filter body 42, wherein the filter body 42 comprises a plurality of stacked crushed stones. Therefore, sediment and other particles in the underground water can be quickly and effectively filtered through the broken stone, so that the underground water is effectively pumped out, and solid particles are prevented from blocking the pipeline.
Alternatively, the crushed stone has a particle size of 3 to 7mm. Specifically, in the present disclosure, the particle diameter of crushed stone is 4mm.
In one embodiment, the drain pipe 5 is buried in the ground in a line, and the gradient of the drain pipe 5 is 5%.
In the present disclosure, the buried well 2 is sized to satisfy the total water inflow Q;
wherein, the formula of calculation of total water inflow Q is: q=a·m 1 Mu; a is the area of a foundation pit;
M 1 the thickness of the aquifer is the thickness of the lyophobic aquifer;
μ is the water cut of the aquifer.
Determining the number of precipitation wells;
calculating the water yield of a single well;
q 0 ＝120πr s lk 1/3
and (3) calculating the number of dewatering wells:
n＝1.1Q/q 0
q 0 for single well water outlet capacity (m 3 /d)；
r s Is the filter radius (m);
l is the filter inlet section length (m), i.e. the length of the filter body 42;
k is the permeability coefficient (m/d) of the aquifer.
Calculating the water level lowering depth of the center of the foundation pit;
S 1 ＝H-(H 2 -q/(πk)×Σl n(R/(2r 0 s in((2j-1)π/2n)))) 0.5
S 1 the underground water level at the center of the foundation pit is lowered;
q＝πk(2H-S w )S w /(l n(R/r w )+Σ(l n(R/(2r 0 s in(jπ/n)))))
q is the single well flow (m 3 /d) calculated according to the following formula:
S w ＝H 1 +s-d w +r o ×i
filter length calculation
When the group wells are pumped, the water inlet length of each well point single well filter is checked as follows; y is 0 >l，y 0 ＝[H 2 -0.732Q/k×(lgR 0 -lgnr 0 n-1 r w )/n] 1/2 。
l is the water inlet length of the filter;
r 0 for foundation pits, etcAn effective radius;
r w is the radius of the pipe well;
h is the thickness of the diving aquifer;
R 0 the sum of the equivalent radius of the foundation pit and the influence radius of the dewatering well is obtained;
R 0 ＝R+r 0 ；
r is the influence radius of the precipitation well;
in one embodiment provided by the disclosure, the sedimentation tank comprises a tank body 93 and a cover plate 94 arranged on the tank body 93, the pump pipe 12 of the submersible pump 11 is communicated with the tank body 93 for guiding in groundwater, and the other end of the tank body 93 is communicated with the municipal pipe network 92; the height of the water outlet of the pump pipe is higher than that of the water inlet of the municipal pipe network. Thus, the underground water can be smoothly discharged, and the precipitated underground water can be effectively discharged under the action of water pressure.
In one embodiment provided by the disclosure, a blocking wall is arranged in the tank body, the height of the blocking wall is higher than the height of the water inlet of the municipal pipe network, and the height of the blocking wall is lower than the height of the water outlet of the pump pipe. This creates a certain pressure to help the groundwater to settle and drain effectively.
The utility model is not limited to the alternative embodiments described above, but any person may derive other various forms of products in the light of the present utility model. The above detailed description should not be construed as limiting the scope of the utility model, which is defined in the claims and the description may be used to interpret the claims.
Claims (9)
1. The foundation pit dewatering well structure suitable for the interaction condition of the weakly permeable layer and the sand layer comprises a submersible pump (11), and is characterized by comprising a buried well (2), a well cover (31), a well pipe (4), a drain pipe (5) and a one-way valve (6);
the buried well (2) is arranged between the ground and a preset concrete foundation (91) and is provided with a hollow cavity, the ground is provided with a well ring (32), and the well cover (31) is arranged on the well ring (32) so as to cover the cavity; the concrete foundation (91) is provided with the well pipe (4);
the drain pipe (5) is communicated with a pump pipe of the submersible pump (11), and a one-way valve is arranged on the pump pipe;
the pump pipe is arranged in the well pipe (4) so that groundwater pumped by the submersible pump (11) can flow into the municipal pipe network (92) after passing through a preset sedimentation tank.
2. Foundation pit dewatering well structure suitable for use in interaction conditions of a weakly permeable layer with a sand layer according to claim 1, characterized in that the well pipe (4) comprises a pipe body with a storage cavity accommodating the filter body (42) and a filter body (42), wherein the filter body (42) comprises a plurality of piled crushed stones.
3. The foundation pit dewatering well structure suitable for use under interaction conditions of a weakly permeable layer and a sand layer as claimed in claim 2, wherein the particle size of the crushed stone is 3-7 mm.
4. A pit dewatering well structure suitable for use in a weak permeable layer and sand interactive condition according to claim 2, wherein said crushed stone has a particle size of 4mm.
5. The foundation pit dewatering well structure suitable for the interaction condition of a weakly permeable layer and a sand layer according to claim 1, wherein the drain pipe (5) is buried underground in a line, and the gradient of the drain pipe (5) is more than or equal to 5 per mill.
6. Foundation pit dewatering well structure suitable for interaction of a weakly permeable layer with a sand layer according to claim 1, characterized in that the size of the buried well (2) is set to be able to meet the total water inflow Q, wherein the calculation formula of the total water inflow Q is:
Q＝A·M 1 ·μ；
a is the area of a foundation pit;
M 1 the thickness of the aquifer is the thickness of the lyophobic aquifer;
μ is the water cut of the aquifer.
7. Foundation pit dewatering well structure suitable for use in interaction conditions of a weakly permeable layer with a sand layer according to claim 1, characterized in that the length of the well pipe (4) is y 0 ，y 0 ＝[H 2 -0.732Q/k×(lgR 0 -lgnr 0 n-1 r w )/n] 1/2 ；
l is the length of the filter body (42) of the well pipe (4);
r 0 the equivalent radius of the foundation pit;
r w is the radius of the pipe well;
h is the thickness of the diving aquifer;
R 0 the sum of the equivalent radius of the foundation pit and the influence radius of the dewatering well is obtained;
R 0 ＝R+r 0 ；
and R is the influence radius of the precipitation well.
8. Foundation pit dewatering well structure suitable for interaction of a weakly permeable layer and a sand layer according to claim 1, characterized in that the sedimentation tank comprises a tank body and a cover plate arranged on the tank body, a pump pipe of the submersible pump (11) is communicated with the tank body for guiding groundwater, and the other end of the tank body is communicated with a municipal pipe network (92);
the height of the water outlet of the pump pipe is higher than that of the water inlet of the municipal pipe network (92).
9. The foundation pit dewatering well structure suitable for the interaction condition of a weakly permeable layer and a sand layer according to claim 8, wherein a blocking wall is arranged in the pool body, the height of the blocking wall is higher than the height of a water inlet of the municipal pipe network (92), and the height of the blocking wall is lower than the height of a water outlet of the pump pipe.
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| CN202223233897.1U CN219100101U (en) | 2022-12-02 | 2022-12-02 | Foundation pit dewatering well structure suitable for interaction condition of weakly permeable layer and sand layer |
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| CN202223233897.1U CN219100101U (en) | 2022-12-02 | 2022-12-02 | Foundation pit dewatering well structure suitable for interaction condition of weakly permeable layer and sand layer |
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