Pneumatic dewatering device for foundation pit without sealing well and foundation pit construction method

Abstract

The present invention discloses a pneumatic dewatering device for a foundation pit without sealing a well, comprising a first water storage chamber, a side wall of which is provided with a plurality of one-way water inlet valves, an inlet and exhaust pipe and a water outlet pipe being provided on the other side wall of the first water storage chamber away from the one-way water inlet valve in sequence from top to bottom, one end of each of the inlet and exhaust pipe and the water outlet pipe extending into the first water storage chamber; a gas detection component comprising a first pipe and a second pipe, one end of each of the first pipe and the second pipe being detachably connected to the other end of the inlet and exhaust pipe, a gas flow meter being provided on the first pipe, and the other end of the second pipe being connected to an air supply device; wherein valves are provided on the first pipe, the second pipe and the water outlet pipe. The present invention has the beneficial effect of being able to pour concrete in one go without affecting the hardening of the concrete and without leaving holes in the base plate, eliminating the need for sealing the well, thereby improving construction efficiency and ensuring the construction quality of the base plate.

Description

Technical Field

[0001] The present invention relates to the field of equipment for foundation pit construction, and more particularly to a pneumatic dewatering device for a well in a foundation pit without sealing. Background Art

[0002] With the development of the construction industry, high-rise large buildings are increasing, and the use of underground space is also increasing. The dewatering technology of deep foundation pits in water-rich areas has also become mature. The specification stipulates that the dewatering water level must be 50 cm lower than the bottom of the foundation pit before excavation can be carried out. However, in conventional projects, the bottom elevation of parts such as elevator foundation pits and sump pits is several meters lower than the foundation pit elevation. If dewatering is carried out according to the lowest elevation, a large number of well points need to be added and more energy will be consumed. If dewatering is carried out according to the normal pit bottom elevation, this local foundation pit is prone to collapse after excavation. It is necessary to use light well point dewatering and other methods for auxiliary dewatering, or place a water pump at the bottom of the local foundation pit for dewatering. The effect is good, but when pouring the bottom plate concrete, the pump needs to be removed or a hole needs to be left in the bottom plate as a well sealing device. Therefore, in order to ensure the pouring quality of concrete and reduce the occurrence of water seepage accidents in the later stage, there is an urgent need for a pneumatic dewatering device that does not require a well seal in the foundation pit. Summary of the Invention

[0003] One purpose of the present invention is to solve at least the above-mentioned problems and to provide a pneumatic dewatering device in a foundation pit that does not require sealing of the well. The device can pour concrete in one go without affecting the hardening of the concrete and leaving holes in the bottom plate, thereby eliminating the need for sealing the well and improving construction efficiency. The device can ensure the construction quality of the bottom plate, the pouring quality of the concrete, and reduce the occurrence of water seepage accidents in the later stage.

[0004] In order to achieve these purposes and other advantages according to the present invention, a pneumatic dewatering device for a well in a foundation pit without sealing is provided, comprising:

[0005] A first water storage chamber, one side wall of which is provided with a plurality of one-way water inlet valves, and an inlet and exhaust pipe and a water outlet pipe are provided on the other side wall of the first water storage chamber away from the one-way water inlet valves, in order from top to bottom, and one end of the inlet and exhaust pipe and the water outlet pipe both extend into the first water storage chamber;

[0006] A gas detection assembly comprising a first pipe and a second pipe, wherein one end of each of the first pipe and the second pipe is detachably connected to the other end of the inlet and exhaust pipes, the first pipe is provided with a gas flow meter, and the other end of the second pipe is connected to a gas supply device;

[0007] Wherein, valves are provided on the first pipeline, the second pipeline and the water outlet pipe.

[0008] Preferably, it also includes a surrounding groove, the groove mouth of which is fixedly connected to the side wall of the first water storage chamber provided with a one-way water inlet valve, so that the surrounding groove and the side wall of the first water storage chamber provided with a one-way water inlet valve are formed to form a second water storage chamber, and the side wall of the second water storage chamber away from the one-way water inlet valve is provided with multiple water inlet holes.

[0009] Preferably, the structure of the first water storage chamber and the second water storage chamber is: comprising a shell, a partition plate is provided in the shell to separate the shell into the first water storage chamber and the second water storage chamber, and the one-way water inlet valve is provided on the partition plate.

[0010] Preferably, the one-way water inlet valve includes a pair of mounting plates arranged opposite to each other, a plurality of connecting columns are provided at intervals between the pair of mounting plates, both ends of each connecting column are fixedly connected to the pair of mounting plates, and a mounting cavity is formed between the pair of mounting plates and the plurality of connecting columns, wherein a plurality of water inlets are provided on the middle part of one of the mounting plates, and a movable cushion is provided in the mounting cavity to cover / open the plurality of water inlets; wherein the mounting plate with the plurality of water inlets is fixedly connected to the partition plate so that the connecting columns and the other mounting plate are located in the first water storage cavity.

[0011] Preferably, a mattress layer is provided around the outer periphery of the shell, and a filter layer is provided below the mattress layer to prevent mud and sand from entering the shell.

[0012] Preferably, a protective circular tube is provided on the upper portion of the side wall of the first water storage chamber, and the protective circular tube is arranged around the outer periphery of the inlet and outlet pipes and the water outlet pipe.

[0013] Preferably, one end of the water outlet pipe away from the shell is detachably connected to a third pipe, and a liquid flow meter is provided on the third pipe.

[0014] The foundation pit construction method utilizes a pneumatic dewatering device in a foundation pit without sealing a well, wherein the foundation pit is a sump or an elevator shaft foundation pit, and specifically comprises the following steps:

[0015] S1. Make a pneumatic dewatering device for the foundation pit without sealing the well on site and set it aside for use after debugging;

[0016] S2. Deepen the design and design the treatment method for the over-excavation part;

[0017] S3, excavation of foundation pit;

[0018] S4. The bottom of the foundation pit is over-excavated to form an installation pit. A filter layer is installed at the bottom of the installation pit. The housing is installed on the filter layer. The gas supply device, gas flow meter, first pipeline, second pipeline, and valve on the outlet pipe are all installed in a position that is easily accessible by hand.

[0019] S5. Construction of mattress layer;

[0020] S6. Open the valve on the first pipeline, close the valves on the second pipeline and the water outlet pipe, and start the gas flow meter 13;

[0021] S7. Repair the foundation pit slope;

[0022] S8. Construction is carried out in a conventional manner and finally concrete is poured;

[0023] S9. After the concrete reaches the designed strength and ensures that no water flows out of the outlet pipe, grouting is injected into the inlet and exhaust pipes. When grout flows out of the outlet pipe, grouting is stopped and the construction is completed.

[0024] The present invention has at least the following beneficial effects:

[0025] The present invention forms a simple pneumatic pump by designing a first water storage chamber, a one-way water inlet valve, an inlet and exhaust pipe, a water outlet pipe, a first pipeline, a second pipeline, a valve, and an air supply device. When constructing a foundation pit (a sump or an elevator shaft foundation pit), the first water storage chamber is installed at the bottom of the over-excavated foundation pit. During the construction process, the valves on the second pipeline and the outlet pipe are closed, and the valve on the first pipeline is opened. During the construction process, water around the device enters the first water storage chamber through the one-way water inlet valve. When the first water storage chamber collects water to a set value or a set range, the valve on the first pipeline is closed and the valves on the second pipeline and the outlet pipe are started at the same time. Then, the air supply device is started. The high-pressure gas ejected by the air supply device enters the first water storage chamber along the second pipeline and the inlet and exhaust pipes. The water in the first water storage chamber is pressurized by the high-pressure gas. When the water is used up, it is discharged from the outlet pipe. When no more water flows out of the outlet pipe, the valves on the second pipe and the outlet pipe are closed, and then the valve on the first pipe is opened again to carry out a new round of water collection and drainage. When all the construction is completed, the first pipe and the second pipe are removed from the inlet and exhaust pipes, and then concrete slurry is injected into the inlet and exhaust pipes. When slurry flows out of the outlet pipe, the first water storage chamber is filled with concrete slurry. At this time, grouting can be stopped, avoiding the complicated operation of traditional well sealing. On the whole, the design is simple and the materials are easy to obtain. It can be made on the construction site. It can pour concrete at one time without affecting the hardening of concrete and leaving holes in the bottom plate, eliminating the need for well sealing, thereby improving construction efficiency, ensuring the construction quality of the bottom plate, ensuring the pouring quality of concrete, and reducing the occurrence of water seepage accidents in the later period.

[0026] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a pneumatic dewatering device for a well in a foundation pit without sealing, according to one of the technical solutions of the present invention;

[0028] Figure 2This is a side structural cross-sectional view of the housing according to one of the technical solutions of the present invention;

[0029] Figure 3 for Figure 2 Middle AA view;

[0030] Figure 4 This is a front view of the housing according to one of the technical solutions of the present invention;

[0031] Figure 5 This is a front view of the partition plate according to one of the technical solutions of the present invention;

[0032] Figure 6 This is a schematic diagram of the installation structure of the housing according to one of the technical solutions of the present invention;

[0033] Figure 7 This is a side structural cross-sectional view of a one-way water inlet valve according to one of the technical solutions of the present invention;

[0034] Figure 8 This is a structural schematic diagram of the first mounting plate according to one of the technical solutions of the present invention;

[0035] Figure 9 for Figure 7 Middle BB view;

[0036] Figure 10 This is a schematic diagram of the three-dimensional structure of the one-way water inlet valve described in one of the technical solutions of the present invention.

[0037] Figure markings: 1-shell; 2-first water storage chamber; 3-second water storage chamber; 4-water inlet; 5-base; 6-partition plate; 7-one-way water inlet valve; 701-first mounting plate; 702-second mounting plate; 703-movable cushion; 704-connecting column; 705-water inlet; 8-inlet and exhaust pipes; 9-protective circular pipe; 10-outlet pipe; 11-first pipeline; 12-second pipeline; 13-gas flowmeter; 14-liquid flowmeter; 15-first valve; 16-second valve; 17-third valve; 18-air supply device; 19-cushion layer; 20-filter layer; 21-gravel filling; 22-foundation pit. DETAILED DESCRIPTION

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0039] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0040] like Figure 1-10As shown, the present invention provides a pneumatic dewatering device for a well in a foundation pit without sealing, comprising:

[0041] The first water storage chamber 2 has a plurality of one-way water inlet valves 7 provided on one side wall thereof, and an inlet and exhaust pipe 8 and an outlet pipe 10 are provided on the other side wall of the first water storage chamber 2 away from the one-way water inlet valve 7, from top to bottom, and one end of each of the inlet and exhaust pipe 8 and the outlet pipe 10 extends into the first water storage chamber 2;

[0042] A gas detection assembly includes a first pipe 11 and a second pipe 12. One end of each of the first pipe 11 and the second pipe 12 is detachably connected to the other end of the intake and exhaust pipe 8. A gas flow meter 13 is provided on the first pipe 11. The other end of the second pipe 12 is connected to a gas supply device 18.

[0043] Wherein, valves are provided on the first pipe 11, the second pipe 12, and the water outlet pipe 10;

[0044] In this technical solution, the foundation pit 22 is a sump or an elevator shaft foundation pit; the one-way water inlet valve 7 is used for external water to enter the first water storage chamber 2, and the side wall of the first water storage chamber 2 is provided with inlet and outlet holes and water outlet holes from top to bottom. The inlet and outlet holes are provided on the side wall of the first water storage chamber 2 near the top, and one end of the inlet and outlet pipe 8 extends into the first water storage chamber 2 through the inlet and outlet holes. The other end of the inlet and outlet pipe 8 is connected to the first pipe 11 and the second pipe 12, which are detachably connected. In actual use, the other end of the inlet and outlet pipe 8 can be designed to have a structure with two ports, and then the first pipe 11 and the second pipe 12 are detachably connected to the two ports respectively. The detachable connection can be sealed by a flange structure or connected by screw connection. The first pipe 11 is provided with a gas flow A meter 13 is provided for detecting the amount of gas discharged. The gas flow meter 13 is a structure well known to those skilled in the art. The end of the second pipe 12 away from the first water storage chamber 2 is connected to an air supply device 18. The air supply device 18 is a structure well known to those skilled in the art, such as a compressor. One end of the water outlet pipe 10 extends into the first water storage chamber 2 through the water outlet hole, and the extending end is close to the bottom of the first water storage chamber 2, so as to drain the accumulated water in the first water storage chamber 2 as much as possible. Valves are provided on the first pipe 11, the second pipe 12, and the water outlet pipe 10. Among them, the valve on the first pipe 11 is a first valve 15, the valve on the second pipe 12 is a second valve 16, and the valve on the water outlet pipe 10 is a third valve 17. During actual installation and use, care should be taken to seal each connection.

[0045] In this technical solution, during installation, the first water storage chamber 2 is installed at the bottom of the over-excavated pit 22. During construction, the second valve 16 and the third valve 17 are closed, and the first valve 15 is opened at the same time to carry out construction. During construction, water around the device enters the first water storage chamber 2 through the one-way water inlet valve 7. When the first water storage chamber 2 collects water within the set value or the set range, the first valve 15 is closed, and the second valve 16 and the third valve 17 are opened at the same time, and then the air supply device 18 is started. The high-pressure gas ejected by the air supply device 18 enters the first water storage chamber 2 along the second pipeline 12 and the air inlet and exhaust pipes 8. The water in the first water storage chamber 2 is discharged from the water outlet pipe 10 under the pressure of the high-pressure gas. When no water is left at the water outlet pipe 10, the second valve 16 and the third valve 17 are closed, and then the first valve 15 is opened again to carry out a new round. Water collection and drainage. When all the construction is completed, the first pipe 11 and the second pipe 12 are removed from the inlet and exhaust pipe 8, and then concrete slurry is injected into the inlet and exhaust pipe 8. When slurry comes out from the outlet pipe 10, the first water storage chamber 2 is filled with concrete slurry. At this time, grouting can be stopped, avoiding the complicated operation of traditional well sealing. In actual use, the installation positions of the inlet and exhaust pipes 8 and the outlet pipe 10 on the first water storage chamber 2 need to be designed in advance according to the volume of the first water storage chamber 2, especially the end of the outlet pipe 10 extending into the first water storage chamber 2 should be as close to the bottom of the first water storage chamber 2 as possible. In actual use, the error caused by the gap between the end of the outlet pipe 10 and the bottom of the first water storage chamber 2 can be ignored, or the gas flow detected by the gas flowmeter 13 can be designed to a range value to adapt to the error caused by the gap between the end of the outlet pipe 10 and the bottom of the first water storage chamber 2.

[0046] The beneficial effect of adopting this technical solution is that a simple pneumatic pump is formed by designing the first water storage chamber 2, the one-way water inlet valve 7, the inlet and exhaust pipes 8, the water outlet pipe 10, the first pipeline 11, the second pipeline 12, the valve, and the air supply device 18. Overall, the design is simple and the materials are easy to obtain. It can be manufactured on the construction site. It can pour concrete in one go without affecting the hardening of the concrete and leaving holes in the bottom plate, eliminating the need for sealing the well, thereby improving construction efficiency, ensuring the construction quality of the bottom plate, ensuring the pouring quality of the concrete, and reducing the occurrence of water seepage accidents in the later period.

[0047] In another technical solution, it also includes a confined groove, the groove opening of which is fixedly connected to the side wall of the first water storage chamber 2 provided with a one-way water inlet valve 7, so that the confined groove and the side wall of the first water storage chamber 2 provided with the one-way water inlet valve 7 form a second water storage chamber 3, and the side wall of the second water storage chamber 3 away from the one-way water inlet valve 7 is provided with multiple water inlet holes 4; specifically, the confined groove is a trough body with one side open, the groove opening of the trough body is fixedly connected to the side wall of the first water storage chamber 2 provided with the one-way water inlet valve 7, so that the trough body and the side wall of the first water storage chamber 2 form a second water storage chamber 3, and the second water storage chamber 3 is a temporary water storage chamber. In actual use, when the first water storage chamber 2 is drained, the second water storage chamber 3 can continue to hold water around the device, realizing the function of draining water while continuing to absorb water, which can improve construction efficiency; in actual use, the design volume of the second water storage chamber 3 needs to be designed according to the situation. The design standard is that the volume of the second water storage chamber 3 is smaller than that of the first water storage chamber and its volume does not affect the structure and mechanical properties of the overall concrete.

[0048] In another technical solution, the structure of the first water storage chamber 2 and the second water storage chamber 3 is as follows: comprising a housing 1, a partition plate 6 is provided in the housing 1 to separate the housing 1 into the first water storage chamber 2 and the second water storage chamber 3, and the partition plate 6 is provided with the one-way water inlet valve 7; specifically, Figures 2 to 5 As shown, a base 5 is formed at the bottom of the shell 1, and a partition plate 6 is provided inside the shell 1 to divide the shell 1 into a first water storage chamber 2 and a second water storage chamber 3. The side wall of the first water storage chamber 2 is provided with a plurality of water inlet holes 4 so that external water enters the second water storage chamber 3 from the water inlet holes 4. The partition plate 6 is provided with a plurality of one-way water inlet valves 7 near the bottom, and the water in the second water storage chamber 3 enters the first water storage chamber 2 through the one-way water inlet valve 7; the use of this technical solution has the beneficial effect that, by designing the shell 1 and the partition plate 6, a structure of a first water storage chamber 2 and a second water storage chamber 3 is provided, which is convenient for assembly and installation.

[0049] In another technical solution, the one-way water inlet valve 7 includes a pair of mounting plates arranged opposite to each other, a plurality of connecting columns 704 are provided at intervals between the pair of mounting plates, both ends of each connecting column 704 are fixedly connected to the pair of mounting plates, and a mounting cavity is formed between the pair of mounting plates and the plurality of connecting columns 704, wherein a plurality of water inlets 705 are provided on the middle part of one mounting plate, and a movable cushion 703 is provided in the mounting cavity to cover / open the plurality of water inlets 705; wherein the mounting plate provided with the plurality of water inlets 705 is fixedly connected to the partition plate 6 so that the connecting columns 704 and the other mounting plate are located in the first water storage cavity 2; specifically, as Figure 5As shown, the partition plate 6 is provided with a mounting hole for installing a one-way water inlet valve 7, and the one-way water inlet valve 7 is in a vertical state when in use. The one-way water inlet valve 7 includes a pair of vertical and opposite mounting plates, and a pair of mounting plates are provided with a plurality of connecting columns 704 away from the center. Both ends of each connecting column 704 are fixedly connected to the corresponding mounting plate, and the gap between the two connecting columns 704 forms a water inlet space. The space formed between a pair of mounting plates and the plurality of connecting columns 704 is a mounting cavity. The pair of mounting plates are respectively a first mounting plate 701 and a second mounting plate 702. The first mounting plate 701 is provided with a plurality of water inlets 705 connected to the inside of the mounting cavity, and the plurality of water inlets 705 form a structure similar to a sieve plate. A movable cushion 703 is provided in the mounting cavity. Under the action of the high-pressure gas ejected by the air supply device 18, the movable cushion 703 moves toward the plurality of water inlets 705 to Block the water inlet 705. When the air supply device 18 does not supply air, the movable cushion 703 opens the water inlet 705 under the flow of water in the second water storage chamber 3. After the water flows into the installation chamber from the water inlet 705, it flows into the first water storage chamber 2 from the water inlet space. In actual use, a water outlet can also be opened on the second mounting plate 702 to make the water flow out faster. The size of the movable cushion 703 is preferably slightly smaller than the side wall of the mounting chamber so that it can better block the water inlet 705. When in use, the first mounting plate 701 is installed in the mounting hole so that the connecting column 704 and the second mounting plate 702 are located in the first water storage chamber 2. It can be used after ensuring sealing. The beneficial effect of adopting this technical solution is that by designing the mounting plate, connecting column 704, mounting chamber, water inlet 705, and movable cushion 703, a one-way water inlet valve 7 structure is provided, which has a simple structure, convenient materials, can be made on site, and is easy to install.

[0050] In another technical solution, a cushion layer 19 is provided around the outer periphery of the shell 1, and a filter layer 20 is provided below the cushion layer 19 to prevent sediment from entering the shell 1; specifically, Figure 6 As shown, the outer periphery of the shell 1 is wrapped with a cushion layer 19, and the cushion layer 19 is 10 cm thick coarse gravel. A 10 cm thick gravel layer, i.e., a filter layer 20, is also laid under the cushion layer 19. During actual installation, after the shell 1 is positioned, a steel casing can be set on the outer periphery of the shell 1 to assist in filling the cushion layer 19 around the shell 1. After filling, the steel casing is taken out and gravel is filled 21 around the cushion layer 19. The beneficial effect obtained by adopting this technical solution is that, by designing the cushion layer 19 and the filter layer 20, mud and sand can be effectively prevented from entering the shell 1 and affecting the water storage in the first water storage chamber 2 and the second water storage chamber 3.

[0051] In another technical solution, a protective circular tube 9 is provided on the upper side wall of the first water storage chamber 2, and the protective circular tube 9 is arranged around the outer periphery of the inlet and outlet pipes 8 and the outlet pipe 10; specifically, Figure 2As shown, the air inlet and outlet holes and the water outlet holes on the first water storage chamber 2 are all arranged on the upper part of the side wall of the first water storage chamber 2, and the protective circular tube 9 is sleeved on the outer periphery of the air inlet and outlet pipes 8 and the water outlet pipe 10 to protect them; the beneficial effect obtained by adopting this technical solution is that by designing the protective circular tube 9, the roots of the air inlet and outlet pipes 8 and the water outlet pipe 10 can be protected.

[0052] In another technical solution, the outlet pipe 10 is detachably connected to a third pipe at one end away from the housing 1, and the third pipe is provided with a liquid flowmeter 14. Specifically, the manner in which the third pipe is detachably connected to the outlet pipe 10 is consistent with the manner in which the first pipe 11 / the second pipe 12 is detachably connected to the intake and exhaust pipes 8. The third pipe is provided with a liquid flowmeter 14, and the third valve 17 is also provided on the third pipe. The third valve 17 is located on a side of the liquid flowmeter 14 away from the outlet pipe 10. The liquid flowmeter 14 is a flowmeter well known to those skilled in the art, such as an electromagnetic flowmeter. This technical solution has the beneficial effect that, by designing the liquid flowmeter 14, the volume of liquid discharged from the first water storage chamber 2 can be observed through the liquid flowmeter 14, and a monitoring value or monitoring range value of the liquid flowmeter 14 can be set according to actual conditions. When the water discharged from the first water storage chamber 2 is within the monitoring range value, the second valve 16 and the third valve 17 can be closed, and the first valve 15 can be opened to carry out a new round of water collection and drainage, thereby providing technical support for subsequent automated monitoring.

[0053] The foundation pit construction method, wherein the foundation pit 22 is a sump or an elevator shaft foundation pit, utilizes a sealing-free well pneumatic dewatering device in the foundation pit, and specifically includes the following steps:

[0054] S1. Make a pneumatic dewatering device for the foundation pit without sealing the well on site and set it aside for use after debugging;

[0055] S2. Deepen the design and design the treatment method of the over-excavation part according to the conventional methods of those skilled in the art;

[0056] S3, excavation of foundation pit 22;

[0057] S4. The bottom of the foundation pit 22 is over-excavated to form an installation pit. A filter layer 20 (10 cm thick gravel layer) is set at the bottom of the installation pit. The housing 1 is installed on the filter layer 20. The gas supply device 18, gas flow meter 13, first pipeline 11, second pipeline 12, and valves on the water outlet pipe 10 are all installed in positions that are easy for manual operation.

[0058] S5, construction of mattress layer 19;

[0059] S6. Open the valve on the first pipe 11, close the valves on the second pipe 12 and the water outlet pipe 10, and start the gas flow meter 13;

[0060] S7, trim the slope of the foundation pit 22 and protect the inlet and exhaust pipes 8 and the outlet pipe 10. For example, the inlet and exhaust pipes 8 and the outlet pipe 10 can be buried in a trench with sand;

[0061] S8. Construction is carried out in a conventional manner and finally concrete is poured;

[0062] S9. After the concrete reaches the designed strength, ensure that no water flows out of the water outlet pipe 10 (that is, there is no water in the first water storage chamber 2, and the gap between the extending end of the water outlet pipe 10 and the bottom of the first water storage chamber 2 is negligible), and grouting is injected into the air inlet and exhaust pipes 8. After slurry flows out of the water outlet pipe 10, grouting is stopped and the construction is completed.

[0063] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the pneumatic dewatering device for unsealed wells in foundation pits of the present invention are obvious to those skilled in the art.

[0064] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. The pneumatic dewatering device for the unsealed well in the foundation pit is characterized by: include: A first water storage chamber, one side wall of which is provided with a plurality of one-way water inlet valves, and an inlet and exhaust pipe and a water outlet pipe are provided on the other side wall of the first water storage chamber away from the one-way water inlet valves, in order from top to bottom, and one end of the inlet and exhaust pipe and the water outlet pipe both extend into the first water storage chamber; A gas detection assembly comprising a first pipe and a second pipe, wherein one end of each of the first pipe and the second pipe is detachably connected to the other end of the inlet and exhaust pipes, the first pipe is provided with a gas flow meter, and the other end of the second pipe is connected to a gas supply device; Wherein, valves are provided on the first pipe, the second pipe and the water outlet pipe; The apparatus further comprises a confined groove, wherein a notch of the confined groove is fixedly connected to a side wall of the first water storage chamber provided with a one-way water inlet valve, so that the confined groove and the side wall of the first water storage chamber provided with the one-way water inlet valve enclose a second water storage chamber, and a side wall of the second water storage chamber away from the one-way water inlet valve is provided with a plurality of water inlet holes; The structure of the first water storage chamber and the second water storage chamber is as follows: comprising a shell, a partition plate is provided in the shell to separate the shell into the first water storage chamber and the second water storage chamber, and the one-way water inlet valve is provided on the partition plate; A cushion layer is provided around the outer periphery of the shell, and a filter layer is provided below the cushion layer to prevent sediment from entering the shell; One end of the water outlet pipe away from the shell is detachably connected to a third pipe, and a liquid flow meter is provided on the third pipe.

2. The pneumatic dewatering device for a well in a foundation pit without sealing as claimed in claim 1, characterized in that: The one-way water inlet valve includes a pair of mounting plates arranged opposite to each other, a plurality of connecting columns are provided in a spacer ring between the pair of mounting plates, both ends of each connecting column are fixedly connected to the pair of mounting plates, and a mounting cavity is formed between the pair of mounting plates and the plurality of connecting columns, wherein a plurality of water inlets are provided on the middle part of one of the mounting plates, and a movable cushion is provided in the mounting cavity to cover / open the plurality of water inlets; wherein the mounting plate with the plurality of water inlets is fixedly connected to the partition plate so that the connecting columns and the other mounting plate are located in the first water storage cavity.

3. The pneumatic dewatering device for a well in a foundation pit without sealing as claimed in claim 1, characterized in that: A protective circular tube is provided on the upper portion of the side wall of the first water storage chamber, and the protective circular tube is arranged around the outer periphery of the inlet and outlet pipes and the water outlet pipe.

4. The foundation pit construction method is characterized in that: The pneumatic dewatering device for a sealing-free well in a foundation pit according to claim 3 is used, wherein the foundation pit is a sump or an elevator shaft foundation pit, and specifically comprises the following steps: S1. Make a pneumatic dewatering device for the foundation pit without sealing the well on site and set it aside for use after debugging; S2. Deepen the design and design the treatment method for the over-excavation part; S3, excavation of foundation pit; S4. The bottom of the foundation pit is over-excavated to form an installation pit. A filter layer is installed at the bottom of the installation pit. The housing is installed on the filter layer. The gas supply device, gas flow meter, first pipeline, second pipeline, and valve on the outlet pipe are all installed in a position that is easily accessible by hand. S5. Construction of mattress layer; S6. Open the valve on the first pipeline, close the valves on the second pipeline and the water outlet pipe, and start the gas flow meter; S7. Repair the foundation pit slope; S8. Construction is carried out in a conventional manner and finally concrete is poured; S9. After the concrete reaches the designed strength and ensures that no water flows out of the outlet pipe, grouting is injected into the inlet and exhaust pipes. When grout flows out of the outlet pipe, grouting is stopped and the construction is completed.

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