CN213709595U - Foundation pit dewatering and drainage system - Google Patents

Abstract

The utility model provides a drainage system falls in foundation ditch, include: a sump; the dewatering well is arranged in the water collecting pit; the sealing cover is arranged at an opening at the upper end of the dewatering well in a covering manner and is used for sealing the dewatering well; the water pumping device is partially arranged in the precipitation well and is used for pumping water in the precipitation well; air exhaust device, the air exhaust device part sets up in the precipitation well, air exhaust device is used for the extraction air in the precipitation well is in order to maintain the precipitation well is negative pressure state, foundation ditch precipitation drainage system, through set up air exhaust device in the precipitation well, utilize air exhaust device to take out the air in the precipitation well, cause the negative pressure of certain degree in the precipitation well to make the saturated hydroenergy of precipitation well penetrating range stratum precipitate out fast for the hydrophobic speed of precipitation well has better precipitation effect.

Description

Foundation pit dewatering and drainage system

Technical Field

The utility model relates to a drainage technical field falls in the foundation ditch particularly, relates to a drainage system falls in foundation ditch.

Background

The foundation pit is an earth pit excavated at the designed position of the foundation according to the elevation and the plane size of the foundation, and the foundation pit engineering is easily collapsed and generates sludge under the influence of underground water, the excavation depth of earth, rainstorm climate and the like. Usually, in order to ensure the normal construction of a foundation pit, underground water and accumulated water in a foundation pit soil body are removed by adopting a caisson and a light well point dewatering method, but the dewatering and drainage effects are limited, so that the water in a saturated soil body of a weakly permeable layer (cohesive soil) and the water remained at an aquifer interface are difficult to be drained, the phenomenon of water-carrying operation of a part of construction standard sections is serious, and great potential safety hazards are brought to the construction.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a system for lowering and draining water in a foundation pit, which is intended to solve at least one aspect of the above problems to some extent.

In order to solve the above problem, the utility model provides a drainage system falls in foundation ditch, include: a sump; the dewatering well is arranged in the water collecting pit; the sealing cover is arranged at an opening at the upper end of the dewatering well in a covering manner and is used for sealing the dewatering well; the water pumping device is partially arranged in the precipitation well and is used for pumping water in the precipitation well; the air extraction device is partially arranged in the precipitation well and used for extracting air in the precipitation well so as to maintain the precipitation well in a negative pressure state.

Optionally, the precipitation well is including offering in the well pit of sump diapire and inlaying locate well casing in the well pit, the upper end of well casing is provided with the opening, sealed lid is located the opening part, just the up end of well casing is higher than the diapire of sump, the lower extreme of well casing is provided with the drainage hole.

Optionally, the dewatering well further comprises a water filtering layer arranged between the well pipe and the well groove, and the water filtering holes are communicated with the water filtering layer.

Optionally, the system further comprises a drain pipe, the bottom wall of the sump is further provided with an air pumping well chamber, the air pumping device is partially arranged in the air pumping well chamber, and the air pumping well chamber is communicated with the water filtering layer through the drain pipe.

Optionally, the air pumping system further comprises a water drainage device, and the water drainage device is arranged between the air pumping well chamber and the water drainage pipe.

Optionally, the water drainage device comprises: the panel is arranged in the extraction well chamber, the flow guide piece is arranged below the panel and fixedly connected with the panel, the panel and the flow guide piece are provided with through holes in a penetrating manner, and the side wall of the flow guide piece is provided with drain holes communicated with the through holes;

the drain pipe is provided with a water drainage hole, the drain pipe is provided with a water diversion piece, the drain pipe is provided with a water drainage hole, the drain pipe is provided with a drain pipe opening, the drain pipe opening is arranged in the drain pipe, the drain pipe opening is arranged in.

Optionally, the bottom wall of the panel is provided with a downwardly extending annular protrusion, and the annular protrusion of the panel is adapted to be matched with the upper end opening of the bottom case to clamp the panel and the bottom case.

Optionally, the water pumping device comprises: a submersible pump disposed within the wellbore; the drain pipe is arranged in the water collecting pit; the drinking-water pipe, the one end of drinking-water pipe with the immersible pump is connected, the other end of drinking-water pipe is suitable for passing sealed lid with drain pipe connects.

Optionally, the air extraction device comprises: the vacuum pump is arranged in the pumping well chamber; one end of the exhaust pipe is connected with the vacuum pump, and the other end of the exhaust pipe penetrates through the sealing cover and extends into the well pipe.

Optionally, the air pumping device further comprises a base, the base is arranged on the bottom wall of the air pumping well chamber, and the vacuum pump is arranged on the base.

Optionally, the gas-pumping device further comprises a cover plate, and the cover plate is covered above the pumping well chamber.

Compared with the prior art, foundation ditch fall drainage system have following advantage:

drainage system falls in foundation ditch, through set up air exhaust device in precipitation well, utilize air exhaust device to take out the air in precipitation well, cause the negative pressure of certain degree in precipitation well to make the saturated hydroenergy of precipitation well penetrating range interior stratum precipitate out fast, accelerate the hydrophobic speed of precipitation well, unnecessary water yield is discharged away by pumping device, has better precipitation effect.

Drawings

Fig. 1 is a schematic structural view of a foundation pit dewatering and drainage system according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a water drainage device of a foundation pit dewatering and drainage system according to an embodiment of the present invention;

fig. 3 is a schematic sectional structure view of a water discharge device of a foundation pit drainage system according to an embodiment of the present invention.

Description of reference numerals:

1. the device comprises a water collecting pit, 2, a dewatering well, 21, a well groove, 22, a well pipe, 22a, a water filtering hole, 23, a water filtering layer, 3, a sealing cover, 4, a water pumping device, 41, a submersible pump, 42, a water discharging pipe, 43, a water pumping pipe, 5, a pumping well chamber, 6, a pumping device, 61, a vacuum pump, 62, a pumping pipe, 63, a base, 7, a water discharging pipe, 8, a water discharging device, 81, a panel, 81a, a through hole, 82, a flow guide piece, 82a, a water flowing hole, 83, a bottom shell, 83a, an overflow hole, 9 and a cover plate.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

An XY coordinate system is provided herein, wherein a forward direction of the X axis represents a right direction, a reverse direction of the X axis represents a left direction, a forward direction of the Y axis represents an upper direction, and a reverse direction of the Y axis represents a lower direction.

In addition, the following description will be briefly made with reference to the orientation: the following directional or positional relationships, as referred to with respect to "upper", "lower", "left", "right", etc., of each structural member, refer to the orientation or positional relationship shown in the drawings; these positional relationships are merely for convenience and simplicity of description and do not indicate or imply that the device referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

As shown in fig. 1, the present embodiment provides a foundation pit dewatering and drainage system, which includes a water collection pit 1, wherein the water collection pit is a soil pit for collecting water excavated at a design position of a foundation according to a base elevation and a base plane size, and the foundation pit dewatering and drainage system further includes a dewatering well 2 disposed in the water collection pit 1. The sealing cover 3 is arranged at the opening at the upper end of the dewatering well 2, particularly, the sealing cover and the dewatering well can be in bolt connection, buckle connection and the like, and the sealing cover can seal the opening of the dewatering well. In the embodiment, the sealing cover is of a plate-shaped structure, and the sealing cover is matched with the surface of the dewatering well to seal the dewatering well. In other embodiments, the sealing cover can be further provided with a water level observation hole and a vacuum meter hole, and sealing treatment is required after connection of corresponding parts. Preferably, a sealing gasket is arranged between the sealing cover and the dewatering well and is locked by a screw, so that the sealing effect of the sealing cover on the dewatering well is further enhanced. Pumping device 4, pumping device 4 part sets up in precipitation well 2, pumping device 4 be used for with water in precipitation well 2 is taken out, air pumping well room 5 has still been seted up to 1 diapire of sump pit, and air pumping device 6 part sets up in air pumping well room 5, and air pumping well room is located one side of precipitation well 2, in this embodiment, the opening of air pumping well room upper end is in the diapire parallel and level of sump pit, and air pumping well room 5's upper end is provided with the apron, the apron with air pumping well room 5 fixed connection, specifically, the apron links together through the grout solidification with air pumping well room to the apron can carry out better closure to air pumping well room, in order to avoid probably having in the air pumping well room when rainy season or other circumstances irritates water, can lead to the fact the damage to the air pumping device who places in air pumping well room. The air extraction well chamber 5 is internally provided with an air extraction device 6, the air extraction device 6 is used for extracting air in the precipitation well 2 so as to maintain the precipitation well 2 in a negative pressure state, and under the negative pressure state, saturated water in the stratum within the penetration range of the precipitation well can be promoted to be rapidly precipitated, the drainage speed of the precipitation well is accelerated, the stratum stagnant water, water in saturated soil and interface residual water are effectively drained, and the precipitation effect is better.

Precipitation well 2 is including seting up in the well casing 21 of sump 1 diapire and inlaying locate well casing 22 in the well casing 21, the upper end of well casing 22 is provided with the opening, sealed lid 3 lid is located the opening part, just the up end of well casing 22 is higher than the diapire of sump 1, be provided with drainage hole 22a on the lateral wall of the lower extreme of well casing 22. In this embodiment, the well casing is the groove structure that the excavation formed on the diapire of sump pit, and the well casing is steel tubular structure, and in transferring to the well casing, a layer of concrete can be laid to the well casing diapire to guarantee the sealing performance in the well casing. And the clearance between the well pipe and the well groove is tightly filled with a mixture of laterite, caustic soda, filter stone (0.2-0.8) and the like, a circle of water filtering layer is formed around the well pipe, the water filtering holes 22a are communicated with the water filtering layer 23, water in the saturated soil body of the weakly permeable layer (cohesive soil) and water-containing layer interface residual water enter the well pipe through the water filtering holes after being filtered by the water filtering layer, so that the pumping of a pumping device is facilitated, the blockage of the water filtering holes is avoided, and the stable operation of the dewatering well is ensured. Use mechanical drilling from the bottom at the well casing to the within range of 30cm upwards, form the drainage hole, aperture 2cm, during the low tube two-layer 100 mesh nylon wire net of twine around it to fill out 2 ~ 4mm gravel material, thereby have better filter effect, and in Y axle direction, the up end of well casing is higher than the diapire of sump pit, under the condition of rainstorm weather, can avoid the rainwater to flow backward, guarantees the normal work of precipitation well, can adapt to more extreme weather.

The utility model provides a drainage system falls in foundation ditch still includes wash-out pipe 7, air pumping well room 5 passes through wash-out pipe 7 with water filtering layer 23 intercommunication, the wash-out pipe is used for leaking the ponding in the air pumping well room and flows to the water filtering layer to flow back in the well pipe through the water filtering layer, discharge through pumping device. Because the sealing state needs to be ensured in the well pipe, the sealing state of the well pipe cannot be influenced when the air pumping well chamber is subjected to flow discharge, therefore, a water drainage device 8 is arranged at an opening of the water drainage pipe 7 in the air pumping well chamber 5, the water drainage device 8 is used for sealing the water drainage pipe 7, and the water drainage pipe is simultaneously sealed under the condition that accumulated water flowing is not influenced so as to ensure the vacuum degree in the well pipe.

As shown in fig. 2 and 3, the air-extracting well further includes a drain device 8, the drain device 8 is provided between the air-extracting well 5 and the drain pipe 7, and the drain device 8 includes: a panel 81, which is not limited in shape, and may be, for example, a circle or a square, and the panel 81 is disposed on the bottom wall of the pumping well chamber 5 and located at the opening of the drain pipe 7; specifically, the panel laminating sets up in the upper end of outlet pipe, and the diapire of the periphery of panel and pumping well room passes through grout solidification and is connected, and the panel is with pumping well room's diapire parallel and level, can in time carry out the drainage to the ponding in the pumping well room like this to avoid ponding to cause the damage to pumping device. The flow guide part 82 is arranged below the panel 81 and fixedly connected with the panel 81, a through hole 81a is formed in the panel 81 and the flow guide part 82 in a penetrating mode, a water flowing hole 82a communicated with the through hole 81a is formed in the side wall of the flow guide part 82, in the embodiment, the flow guide part is of a cylindrical structure, the middle of the flow guide part is hollow, the flow guide part and the panel can be integrally formed, the through hole is formed in the middle of the panel and the flow guide part in a penetrating mode, and the through hole 81a is communicated with the water flowing hole 82 a; the accumulated water in the pumping well chamber can flow into the flow guide piece from the through hole and then flow out through the drain hole, and is accumulated in the bottom shell 83, the bottom case 83 is a hollow case structure with an open upper end, the bottom case 83 is embedded in the drain pipe 7, an overflow hole 83a is formed on a side wall of the bottom case 83, the bottom case 83 surrounds the diversion member 82, the bottom case 83 is connected with the panel 81, the overflow hole 83a is higher than the water flowing hole 82a, that is, in the Y-axis direction, the distance from the overflow hole 83a to the bottom wall of the bottom case 83 is greater than the distance from the water flow hole 82a to the bottom wall of the bottom case 83, when the accumulated water in the bottom shell is excessive, the accumulated water can flow out of the overflow hole and flow into the water filtering layer, and the accumulated water is always reserved in the bottom shell, and the water flowing hole at the lower end of the flow guide piece is immersed in the accumulated water, so that the possibility of ventilation at two ends of the water drain pipe is avoided.

The bottom wall of panel 81 is provided with downwardly extending's annular arch, and specifically, the annular arch can set up in succession at the bottom wall of panel, also can set up at the interval on the bottom wall of panel, and annular arch and the bottom wall of panel can be integrated into one piece setting, the annular arch of panel 81 be suitable for with the upper end opening cooperation of drain pan 83 is in order to realize panel 81 with the joint of drain pan 83, can understand, in other embodiments, the annular arch of drain pan and panel can also be through screw thread fixed connection, specifically, the bellied lateral wall of annular and the inside wall of drain pan are provided with the assorted screw thread to be convenient for dismantle, make things convenient for follow-up maintenance. Preferably, can be provided with the filter screen in the through-hole 81a, the density of filter screen can be selected according to the condition of job site, can play the effect to the ponding prefilter in the aspiration chamber.

As shown in fig. 1, the water pumping device 4 includes: a submersible pump 41, the submersible pump 41 being disposed within the well tubular 22; a drain pipe 42, the drain pipe 42 being disposed in the sump 1; the output end of the drain pipe is suitable for being connected with a municipal wastewater pipeline, so that the pumped water can be prevented from sinking again and infiltrating into the soil layer. A water pumping pipe 43, one end of the water pumping pipe 43 is connected with the submersible pump 41, and the other end of the water pumping pipe 43 is suitable for penetrating the sealing cover 3 and the water discharging pipe 42. Specifically, in the embodiment, the submersible pump can be a submersible sewage electric pump with pumping capacity of 15-25 m3/h and a head of 20m, a water pump with large well pipe seepage amount and large installation power and a water pump with small seepage amount and small installation power are arranged according to actual field conditions, the direction and distance of water drainage are arranged according to the 'nearest principle'. According to actual field investigation, the rainwater wells around can meet the requirement of conveying water pumping quantity outwards, and water seepage and water pumping are kept balanced.

In order to ensure that the submersible pump is not blocked, the submersible pump is usually suspended in the well pipe, so that the water pumping pipe bears too much load, in other embodiments, a suspension wire can be further arranged to suspend the submersible pump at the lower end of the sealing cover, so that the load of the water pumping pipe is reduced, and the water pumping device works more stably and reliably.

As shown in fig. 1, the suction device 6 comprises: a vacuum pump 61, the vacuum pump 61 being disposed in the pumping well chamber 5; and one end of the exhaust pipe 62 is connected with the vacuum pump 61, and the other end of the exhaust pipe 62 penetrates through the sealing cover 3 and extends into the well pipe 22. Air exhaust device 6 still includes base 63, base 63 sets up on the diapire of pumping well room 5, vacuum pump 61 sets up on the base 63, the position bed hedgehopping of vacuum pump is gone up with the base to the base, makes the vacuum pump body keep away from the diapire of pumping well room, and is very fast like this at ponding speed, and when the drainage device came too late complete drainage to the filter layer, also can guarantee the safety of vacuum pump, further improves air exhaust device's security performance.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.

Claims (10)

1. A foundation pit dewatering and drainage system, comprising:

a sump (1);

a precipitation well (2) arranged in the sump (1);

the sealing cover (3) is arranged at an opening at the upper end of the dewatering well (2) in a covering manner;

the water pumping device (4) is partially arranged in the precipitation well (2), and the water pumping device (4) is used for pumping out water in the precipitation well (2);

the air extracting device (6) is partially arranged in the dewatering well (2), and the air extracting device (6) is used for extracting air in the dewatering well (2) so as to maintain the dewatering well (2) in a negative pressure state.

2. The foundation pit dewatering and drainage system according to claim 1, wherein the dewatering well (2) comprises a well groove (21) formed in the bottom wall of the water collection pit (1) and a well pipe (22) embedded in the well groove (21), an opening is formed in the upper end of the well pipe (22), the sealing cover (3) is covered on the opening, the upper end face of the well pipe (22) is higher than the bottom wall of the water collection pit (1), and a drainage hole (22a) is formed in the lower end of the well pipe (22).

3. The foundation pit dewatering and drainage system according to claim 2, wherein the dewatering well (2) further comprises a water filtering layer (23) arranged between the well pipe (22) and the well groove (21), and the water filtering holes (22a) are communicated with the water filtering layer (23).

4. The foundation pit dewatering and drainage system according to claim 3, further comprising a drain pipe (7), wherein the bottom wall of the sump (1) is further provided with an air pumping well chamber (5), the air pumping device (6) is partially arranged in the air pumping well chamber (5), and the air pumping well chamber (5) is communicated with the water filtering layer (23) through the drain pipe (7).

5. The foundation pit dewatering and drainage system according to claim 4, further comprising a water drainage device (8), wherein the water drainage device (8) is arranged between the pumping well chamber (5) and the water drainage pipe (7).

6. A foundation pit dewatering and drainage system according to claim 5, characterized in that the water drainage device (8) comprises:

a panel (81), said panel (81) being arranged inside said extraction well (5);

the flow guide piece (82) is arranged below the panel (81) and fixedly connected with the panel (81), a through hole (81a) is formed in the panel (81) and the flow guide piece (82) in a penetrating mode, and a water flowing hole (82a) communicated with the through hole (81a) is formed in the side wall of the flow guide piece (82);

the drain pipe comprises a bottom shell (83), the bottom shell (83) is of a shell structure which is hollow inside and is provided with an opening at the upper end, the bottom shell (83) is embedded in the drain pipe (7), an overflow hole (83a) is formed in the side wall of the bottom shell (83), the bottom shell (83) surrounds the flow guide piece (82), the bottom shell (83) is connected with the panel (81), and the overflow hole (83a) is higher than the water flowing hole (82 a).

7. The foundation pit dewatering and drainage system according to claim 6, wherein the bottom wall of the panel (81) is provided with a downwardly extending annular projection, and the annular projection of the panel (81) is adapted to cooperate with an upper end opening of the bottom shell (83) to achieve clamping of the panel (81) with the bottom shell (83).

8. Foundation pit dewatering and drainage system according to claim 2, characterized in that the water pumping device (4) comprises:

a submersible pump (41), the submersible pump (41) being disposed within the well tubular (22);

a drain pipe (42), the drain pipe (42) being disposed within the sump (1);

the drinking-water pipe (43), the one end of drinking-water pipe (43) with immersible pump (41) are connected, the other end of drinking-water pipe (43) is suitable for passing sealed lid (3) with drain pipe (42) are connected.

9. A foundation pit dewatering and drainage system according to claim 4, characterized in that the air extraction device (6) comprises:

a vacuum pump (61), the vacuum pump (61) being arranged within the pumping well chamber (5);

one end of the air exhaust pipe (62) is connected with the vacuum pump (61), and the other end of the air exhaust pipe (62) penetrates through the sealing cover (3) and extends into the well pipe (22).

10. The foundation pit dewatering and drainage system according to claim 4, further comprising a cover plate (9), wherein the cover plate (9) is arranged above the pumping well chamber (5).

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