Negative-pressure dynamic precipitation device for low-permeability mudstone layer

Abstract

The utility model discloses a negative-pressure dynamic precipitation device for a low-permeability mudstone layer, and relates to the field of foundation pit engineering construction. Comprising an induction type dewatering device and further comprises a controller, a vacuum pump, a sealing cover and a well pipe with a hole. A plurality of water inlet holes are formed in the pipe wall of the perforated well pipe; the perforated well pipe is inserted into the dewatering well and clings to the wall of the dewatering well; the top of the perforated well pipe is connected with the sealing cover; an air pipe is further included; the other end of the air pipe is located outside the well pipe with the hole and connected with the vacuum pump. The device further comprises an air pressure automatic valve sensor. And the air pressure automatic valve sensor is arranged in the well pipe with the hole and is connected with the controller. Air pressure in the dewatering well is recognized through the air pressure automatic valve sensor, the controller controls the vacuum pump valve to be opened after receiving air pressure signals, and the vacuum pump exhausts air in the dewatering well through the air pipe so that the negative pressure state can be kept in the dewatering well. Underground water enters the dewatering well through the water inlet hole; in the process, underground water can be rapidly collected, and the foundation pit dewatering efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of foundation pit engineering construction, in particular to a negative pressure dynamic precipitation device for low permeability mudstone layers. Background Art

[0002] At present, the requirements for the working environment of foundation pit projects are constantly increasing, the requirements that groundwater cannot flow into the foundation pit working surface are becoming more and more stringent, and the construction period and construction cost of foundation pit projects are also receiving more and more attention. The traditional dewatering system or dewatering method often involves digging dewatering wells around the foundation pit, and then placing water pumps in the dewatering wells to pump water; this construction process requires operators to observe the water storage in the dewatering wells at any time, and then operate the water pumps to open and close according to the water storage in the dewatering wells, which wastes manpower and affects the efficiency of foundation pit dewatering.

[0003] The Chinese patent with the existing authorization announcement number CN218263952U discloses an inductive foundation pit drainage system, including: a drainage well; a water pump, which is placed in the drainage well and connected to the outside of the drainage well through a drainage pipe; a liquid level sensor, which is suitable for detecting the liquid level in the drainage well; a controller, which is connected to both the liquid level sensor and the water pump, and the controller is suitable for controlling the water pump to start when receiving a liquid level signal higher than a preset water level, and is suitable for controlling the water pump to close when receiving a liquid level signal lower than a preset water level. The liquid level sensor detects the liquid level in the drainage well and transmits the liquid level signal to the controller, which judges the liquid level signal, and controls the water pump to start if it is higher than the preset water level, and controls the water pump to close if it is lower than the preset water level.

[0004] This patent solves the problem that manually operating the water pump on and off wastes manpower and affects the efficiency of foundation pit dewatering. However, when the underground soil layer is a mudstone layer with low permeability, it is difficult to collect groundwater in the dewatering well due to the low permeability of the mudstone layer, and it takes a long time to collect groundwater, which further leads to low foundation pit dewatering efficiency.

[0005] Therefore, it is extremely important to propose a negative pressure dynamic precipitation device for low permeability mudstone layers that can collect groundwater quickly. Utility Model Content

[0006] The utility model aims to solve the problem that when the underground soil layer is a mudstone layer with low permeability, it is difficult and takes a long time to collect groundwater with the existing induction precipitation device, which further leads to low foundation pit precipitation efficiency.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is: a negative pressure dynamic dewatering device for low permeability mudstone layer, including an induction dewatering device, a controller, a vacuum pump, a sealing cover, and a well pipe with holes; the wall of the well pipe with holes is provided with a plurality of water inlet holes from top to bottom; the well pipe with holes is inserted into the dewatering well and is close to the well wall of the dewatering well, the top of the well pipe with holes is connected to the sealing cover and the sealing cover is located on the ground; the controller is connected to the vacuum pump;

[0008] It also includes an air pipe; one end of the air pipe is located inside the well pipe with holes, and the other end is located outside the well pipe with holes and connected to a vacuum pump; the air pipe passes through the sealing cover;

[0009] It also includes an air pressure automatic valve sensor; the air pressure automatic valve sensor is placed in the well pipe with holes and connected to the controller;

[0010] The controller is used to receive the signal from the air pressure automatic valve sensor; when the air pressure in the precipitation well is higher than the set value, the controller controls the vacuum pump to start.

[0011] Furthermore, the inductive precipitation device includes a water level sensor; the water level sensor is placed in a well pipe with holes and connected to a controller;

[0012] The induction precipitation device also includes a water pump; the controller is connected to the water pump; the water pump is placed in a well pipe with holes and is located below the water level sensor; the water pump is connected to a water pipe, one end of the water pipe away from the water pump is located on the ground and the water pipe passes through a sealing cover;

[0013] The controller is used to receive the water level sensor signal; when the water level in the precipitation well is higher than the location of the water level sensor, the controller controls the water pump to start.

[0014] Furthermore, the water pump is located above the bottom of the precipitation well.

[0015] Furthermore, it also includes a closed well pipe; the top of the well pipe with holes is connected to a sealing cover through the closed well pipe.

[0016] Furthermore, the sealing cover is provided with an exhaust hole and a drain hole;

[0017] The air pipe penetrates the sealing cover through the air exhaust hole; and the water pipe penetrates the sealing cover through the water drainage hole.

[0018] Furthermore, it also includes a drainage ditch; one end of the water pipe away from the water pump is placed in the drainage ditch and a flow meter is installed in the drainage ditch.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model is used for low-permeability mudstone layers. The air pressure in a precipitation well is identified by an automatic air pressure valve sensor. After receiving the air pressure signal from the automatic air pressure valve sensor, the controller controls the opening of a vacuum pump valve. The vacuum pump draws air out of the precipitation well through an air pipe so that a negative pressure state is maintained in the precipitation well. The precipitation well maintains a negative pressure state, and groundwater enters the precipitation well through the water inlet hole of the well pipe with holes. This process can continuously and dynamically collect groundwater at a relatively fast speed, thereby improving the efficiency of foundation pit precipitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the front view of the utility model.

[0022] Figure 2 It is a top view of the utility model.

[0023] The meanings of the numbers in the figure are: 1. Vacuum pump; 2. Dewatering well; 3. Exhaust hole; 4. Drainage hole; 5. High-voltage hole; 6. Low-voltage hole; 7. Water level sensor; 8. Automatic air pressure valve sensor; 9. Water pump; 10. Well pipe with holes; 11. Closed well pipe; 12. Sealing cover; 13. Controller; 14. Water pipe; 15. Air pipe. DETAILED DESCRIPTION

[0024] The technical solution of the utility model is clearly and completely described below in conjunction with the drawings and specific implementation methods of the specification. The described embodiment is one embodiment of the utility model, and the utility model may also have other implementation methods.

[0025] Example:

[0026] See also Figure 1~Figure 2 The utility model is a negative pressure dynamic precipitation device for low permeability mudstone layer, including an induction precipitation device, a controller 13, a vacuum pump 1, a sealing cover 12, and a well pipe with holes 10; the well pipe with holes 10 has a plurality of water inlet holes on its wall from top to bottom; the well pipe with holes 10 is inserted into a precipitation well 2 and is close to the well wall of the precipitation well 2, the top of the well pipe with holes 10 is connected to the sealing cover 12 and the sealing cover 12 is located on the ground; the controller 13 is connected to the vacuum pump 1;

[0027] It also includes an air pipe 15; one end of the air pipe 15 is located inside the well pipe 10 with holes, and the other end is located outside the well pipe 10 with holes and connected to the vacuum pump 1; the air pipe 15 passes through the sealing cover 12;

[0028] It also includes an air pressure automatic valve sensor 8; the air pressure automatic valve sensor 8 is placed in the well pipe 10 with holes and connected to the controller 13;

[0029] The controller 13 is used to receive the signal of the air pressure automatic valve sensor 8; when the air pressure in the precipitation well 2 is higher than the set value, the controller 13 controls the vacuum pump 1 to start.

[0030] In this embodiment, the utility model is used for low permeability mudstone layer, and the air pressure in the precipitation well 2 is identified by the air pressure automatic valve sensor 8. When the air pressure in the precipitation well 2 is higher than the set value, the controller 13 receives the air pressure signal of the air pressure automatic valve sensor 8 and controls the valve of the vacuum pump 1 to open. The vacuum pump 1 pumps air out of the precipitation well 2 through the air pipe 15 to keep the precipitation well 2 in a negative pressure state; the precipitation well 2 maintains a negative pressure state, and groundwater enters the precipitation well 2 through the water inlet hole of the well pipe with holes 10; this process can continuously and dynamically collect groundwater faster, thereby improving the foundation pit precipitation efficiency. After the groundwater enters the well pipe with holes 10, it is dewatered by the induction precipitation device.

[0031] Through detailed investigation in the early stage, compaction grouting and asphalt sealing of surface cracks around the foundation pit can effectively form a funnel-shaped water level line in the soil, which can speed up the precipitation rate and reduce the precipitation cycle. At the same time, it also effectively prevents the phenomenon of surface water (including rainfall, snowmelt water, road washing water, etc.) from replenishing groundwater.

[0032] In actual projects, if the precipitation well 2 is located in the foundation pit of an underground project, an intercepting ditch and a water-stopping curtain may be added to prevent external water from flowing into the foundation pit.

[0033] As a preferred embodiment, the inductive precipitation device includes a water level sensor 7; the water level sensor 7 is placed in a well pipe with holes 10 and connected to a controller 13;

[0034] The induction precipitation device also includes a water pump 9; a controller 13 is connected to the water pump 9; the water pump 9 is placed in a well pipe 10 with holes and is located below the water level sensor 7; the water pump 9 is connected to a water pipe 14, an end of the water pipe 14 away from the water pump 9 is located on the ground and the water pipe 14 passes through the sealing cover 12;

[0035] The controller 13 is used to receive the signal from the water level sensor 7; when the water level in the precipitation well 2 is higher than the position of the water level sensor 7, the controller 13 controls the water pump 9 to start.

[0036] In this embodiment, the sealing cover 12 is provided with a strong current hole 5 and a weak current hole 6. The water level sensor 7 is connected to the controller 13 through a wire passing through the weak current hole 6, and the controller 13 is connected to the water pump 9 through a wire passing through the strong current hole 5; the air pressure automatic valve sensor 8 is connected to the controller 13 through a wire passing through the weak current hole 6, and the controller 13 is connected to the vacuum pump 1 through a wire.

[0037] The water level sensor 7 is set at the same elevation as the bottom of the foundation pit; when the water level in the precipitation well 2 is higher than the water level sensor 7, the controller 13 receives the water level signal from the water level sensor 7 and controls the water pump 9 to start; the water pump 9 operates to pump water and discharges water through the water pipe 14; when the water level in the precipitation well 2 is lower than the water level sensor 7, the water pump 9 stops pumping water; this process effectively solves the problem that manual operation of opening and closing the water pump wastes manpower and affects the efficiency of foundation pit precipitation

[0038] As a preferred embodiment, the water pump 9 is located above the bottom of the precipitation well 2.

[0039] In this embodiment, when groundwater enters the precipitation well 2 through the water inlet hole in the wall of the perforated well pipe 10, it may carry mud and sand, which eventually sinks to the bottom of the precipitation well 2; the water pump 9 is located above the bottom of the precipitation well 2, so that the water pump 9 can avoid the mud and sand.

[0040] As a preferred embodiment, it also includes a closed well pipe 11; the top of the perforated well pipe 10 is connected to a sealing cover 12 through the closed well pipe 11.

[0041] In this embodiment, clay is used to backfill within 1 meter below the wellhead and waterproof mortar is applied on the top of the clay. At the same time, a closed well pipe 11 is set on the top of the perforated well pipe 10. The closed well pipe 11 prevents the air on the surface from entering the precipitation well 2 through the pipe wall, thereby ensuring the realization of a negative pressure state.

[0042] In actual projects, closed well pipes 11 may be arranged at different locations of the perforated well pipe 10 to effectively dewater groundwater in different strata separately.

[0043] As a preferred embodiment, the sealing cover 12 is provided with an exhaust hole 3 and a drain hole 4;

[0044] The air pipe 15 penetrates the sealing cover 12 through the air exhaust hole 3 ; the water pipe 14 penetrates the sealing cover 12 through the water drainage hole 4 .

[0045] In this embodiment, the air pipe 15 goes through the air exhaust hole 3 and the water pipe 14 goes through the water drain hole 4, so that the air pipe 15 and the water pipe 14 do not interfere with each other and are sealed separately, resulting in a better sealing effect.

[0046] As a preferred embodiment, it also includes a drainage ditch; the end of the water pipe 14 away from the water pump 9 is placed in the drainage ditch and a flow meter is installed in the drainage ditch.

[0047] In this embodiment, by setting up drainage ditches and flow meters, the flow meters can record the water output, so that operators can know the specific precipitation effect and groundwater conditions.

[0048] The terms “connection”, “fixation” and “docking” appearing in the description of the present invention may refer to fixed connection, processing, welding or mechanical connection. The specific meanings of the above terms in the present invention shall be understood according to the specific circumstances.

[0049] In the description of the present invention, the terms "inside", "upper", "lower", "end", "side", "outside", etc., which indicate the orientation or position relationship, are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying a specific orientation that the device or element referred to must have, and therefore cannot be understood as a limitation on the present invention.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A negative pressure dynamic precipitation device for low permeability mudstone layer, including an induction precipitation device, characterized in that: It also includes a controller (13), a vacuum pump (1), a sealing cover (12), and a well pipe with holes (10); the well pipe with holes (10) has a plurality of water inlet holes on its wall from top to bottom; the well pipe with holes (10) is inserted into the drainage well (2) and is in close contact with the wall of the drainage well (2); the top of the well pipe with holes (10) is connected to the sealing cover (12), and the sealing cover (12) is located on the ground; the controller (13) is connected to the vacuum pump (1); It also includes an air pipe (15); one end of the air pipe (15) is located inside the well pipe with holes (10), and the other end is located outside the well pipe with holes (10) and connected to the vacuum pump (1); the air pipe (15) passes through the sealing cover (12); It also includes an air pressure automatic valve sensor (8); the air pressure automatic valve sensor (8) is placed in the well pipe with holes (10) and is connected to the controller (13); The controller (13) is used to receive a signal from the air pressure automatic valve sensor (8); when the air pressure in the precipitation well (2) is higher than a set value, the controller (13) controls the vacuum pump (1) to start.

2. The negative pressure dynamic precipitation device for low permeability mudstone layer according to claim 1, characterized in that: The inductive precipitation device comprises a water level sensor (7); the water level sensor (7) is placed in a well pipe with holes (10) and is connected to a controller (13); The induction-type precipitation device further comprises a water pump (9); the controller (13) is connected to the water pump (9); the water pump (9) is placed in the well pipe with holes (10) and is located below the water level sensor (7); the water pump (9) is connected to a water pipe (14), one end of the water pipe (14) away from the water pump (9) is located on the ground, and the water pipe (14) passes through the sealing cover (12); The controller (13) is used to receive a signal from the water level sensor (7); when the water level in the precipitation well (2) is higher than the location of the water level sensor (7), the controller (13) controls the water pump (9) to start.

3. The negative pressure dynamic precipitation device for low permeability mudstone layer according to claim 2, characterized in that: The water pump (9) is located above the bottom of the precipitation well (2).

4. The negative pressure dynamic precipitation device for low permeability mudstone layer according to claim 1, characterized in that: It also includes a closed well pipe (11); the top of the well pipe with holes (10) is connected to a sealing cover (12) via the closed well pipe (11).

5. The negative pressure dynamic precipitation device for low permeability mudstone layer according to claim 2, characterized in that: The sealing cover (12) is provided with an exhaust hole (3) and a drain hole (4); The air pipe (15) penetrates the sealing cover (12) through the air exhaust hole (3); and the water pipe (14) penetrates the sealing cover (12) through the water drainage hole (4).

6. The negative pressure dynamic precipitation device for low permeability mudstone layer according to claim 2, characterized in that: It also includes a drainage ditch; one end of the water pipe (14) away from the water pump (9) is placed in the drainage ditch, and a flow meter is installed in the drainage ditch.

Images