An underground water purification plant pool wall repair device with isolation function

Abstract

The present invention relates to the technical field of underwater operations, and particularly to a repair device for the pool wall of an underground water purification plant with an isolation function, which includes a housing, an isolation plate, a first active push rod, and a vacuum pumping housing; a U-shaped isolation plate is fixedly connected to the rear side inside the housing; a telescopic plate is provided in the middle of the isolation plate, and a first active push rod is fixedly connected to the isolation plate, and the telescopic plate is driven to stretch and contract by the first active push rod; a vacuum pumping housing is installed on the front side of the isolation plate, and contacts the pool wall through the vacuum pumping housing and pumps out the air. By closely contacting the pool wall through the housing, the present invention can significantly reduce the water in the water purification pool from flowing into the inside of the housing. Cooperating with the liquid discharge assembly at the bottom, the infiltrated water can be discharged in time, so that a low water depth state of 1-2 cm is maintained inside the housing. This not only ensures that the device can operate stably under water, but also creates clear conditions for the recognition camera to observe the pool wall.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater operations, and particularly to a repair device for the pool wall of an underground water purification plant with an isolation function. Background Art

[0002] The pool walls of underground water purification plants are in an environment of water erosion for a long time, and problems such as damage and cracks are likely to occur. Traditional methods for repairing pool walls often require the pool to be emptied before the operation can be carried out, which not only consumes a large amount of time but also affects the normal operation of the water purification plant. When repairing the pool wall under water, many challenges are faced, such as extremely poor visibility due to turbid water in the pool and complex water body components. These factors exacerbate the difficulties in accurately judging the damage condition of the pool wall and isolating the repair area.

[0003] For the Chinese patent application with the publication number CN119163088A, although the underwater repair isolation device for the pool wall of an underground water purification plant and its water-carrying repair construction method disclose the water-carrying repair operation for the pool wall of the water purification plant, they still cannot overcome the problems of extremely poor visibility due to turbid water in the pool and complex water body components. Summary of the Invention

[0004] In order to overcome the disadvantages of the challenges faced in repairing the pool wall under water, such as extremely poor visibility due to turbid water in the pool and complex water body components, the present invention provides a repair device for the pool wall of an underground water purification plant with an isolation function.

[0005] The technical implementation solution of the present invention is as follows: A repair device for the pool wall of an underground water purification plant with an isolation function includes a housing, an isolation plate, a first active push rod, and a vacuum pumping housing; the isolation plate arranged in a U shape is fixedly connected to the rear side inside the housing; a telescopic plate is provided in the middle of the isolation plate, and the first active push rod is fixedly connected to the isolation plate, and the telescopic plate is driven by the first active push rod to stretch and contract; a vacuum pumping housing is installed on the front side of the isolation plate, and the vacuum pumping housing contacts the pool wall and pumps out the air through it.

[0006] It further includes an air intake and exhaust pipe, a water inlet pipe, and a sewage pipe; the air intake and exhaust pipe is communicated with the upper side of the vacuum pumping housing; the water inlet pipe is communicated with the upper side of the vacuum pumping housing; the sewage pipe is installed on the lower side of the vacuum pumping housing.

[0007] Furthermore, the bottom of the sewage pipe is 1 cm away from the bottom inside the vacuum pumping housing.

[0008] Furthermore, it further includes an inflatable airbag, and the inflatable airbag is arranged on the front side of the vacuum pumping housing.

[0009] Furthermore, it further includes a standing plate, and the standing plate is fixedly connected to the rear side inside the housing.

[0010] Furthermore, it further includes an identification camera, and the identification camera is installed on the top of the housing.

[0011] Furthermore, it further includes a liquid drainage component. The liquid drainage component is installed at the bottom of the housing, and the water inside the housing is drained to the outside of the housing through the liquid drainage component.

[0012] Furthermore, it further includes a first vertical plate, a second vertical plate, a baffle, a collection component, a motor, and a filter plate; the right front side of the housing is fixedly connected with the first vertical plate and the second vertical plate which are distributed in parallel, and the second vertical plate is located at the right rear of the first vertical plate; the front side of the first vertical plate is fixedly connected with the baffle; a collection component is arranged between the first vertical plate and the second vertical plate, and the adhesion is collected through the collection component; a motor is installed at the upper part of the right front side of the housing; at least 6 filter plates are installed on the long rotating shaft of the motor.

[0013] Furthermore, the contact side of the baffle with the pool wall is made of rubber material.

[0014] Furthermore, the collection component is a filter screen, and the filter screen slides between the first vertical plate and the second vertical plate; it further includes a second active push rod, a connecting block, a water pipe, an isolation shell, and a nozzle; a plurality of second active push rods are installed on the right side plate of the housing; the telescopic part of the second active push rod is fixedly connected with the connecting block; a water pipe is fixedly connected to the upper side of the connecting block, and a pump is provided on the water pipe to pump and suck water; an isolation shell is fixedly connected to the left side of the water pipe, and the isolation shell covers the left side of the filter screen and is fixedly connected to it; a nozzle is fixedly connected to the right side of the water pipe, and the nozzle faces the filter plate.

[0015] Furthermore, it further includes a waterproof membrane. A waterproof membrane is connected between the housing and the water pipe. When the water pipe moves left and right, the waterproof membrane is used to prevent the water in the purification pool from entering the housing.

[0016] The present invention has the following advantages:

[0017] By closely contacting the housing with the pool wall, the present invention can significantly reduce the water in the purification pool from flowing into the interior of the housing. Cooperating with the liquid drainage component at the bottom, the infiltrated water can be discharged in time, maintaining a low water depth state of 1 - 2 cm inside the housing. In this way, it not only ensures the stable operation of the device under the condition of water, but also creates clear conditions for the recognition camera to observe the pool wall.

[0018] By driving the U-shaped isolation plate by the first active push rod, the present invention makes the vacuum pumping housing closely fit the pool wall. Through the vacuum pumping operation, a completely water-impermeable working space is formed between the rear wall inside the housing, the U-shaped isolation plate and the pool wall, greatly ensuring the safety and continuity of the repair operation.

[0019] In view of the problem that debris is easily attached to the vacuum pumping housing during water-carrying operation, before vacuum pumping, a large amount of water is first injected into the vacuum pumping housing through the water inlet pipe to wash away the debris inside the vacuum pumping housing and the debris between the inflatable airbag and the pool wall, and the sewage is discharged in a timely manner through the sewage pipe and the liquid discharge assembly. Subsequently, air is sent in through the air inlet and extraction pipe to blow away the remaining moisture, and then the inflatable airbag is inflated to closely contact the pool wall, ensuring that the vacuum pumping housing is clean and fully adheres to the pool wall, thereby achieving a stable and reliable vacuum adsorption effect.

[0020] The motor of the present invention drives at least 6 detachable filter plates to rotate, and can scrape the adhesions on the pool wall over a long distance. When adhesions accumulate on the right side of a filter plate, the motor drives the filter plate to rotate clockwise, replaces the new filter plate to continue the operation, and ensures the comprehensiveness and high efficiency of the cleaning of the adhesions on the pool wall.

[0021] When the filter plate scrapes the adhesions, the pump on the water pipe works, and the water sprayed by the nozzle forms a water flow to the left. This water flow can stably intercept the scraped adhesions on the right side of the filter plate, prevent them from floating in the purification pool, and at the same time can self-clean the filter plate on the left side of the motor and wash the adhesions towards the filter screen for collection, effectively maintaining the water quality cleanliness of the purification pool.

[0022] After the pool wall repair work of the present invention is completed, in the cleaning pool, under the second active push rod, the filter screen enters the rotation range of the filter plate. The motor drives the filter plate to rotate, and can transfer the adhesions collected by the filter screen, and at the same time cooperate with flushing water from top to bottom, and can quickly wash the adhesions clean. Description of the Drawings

[0023] Figure 1 is the structural schematic diagram disclosed by the present invention;

[0024] Figure 2 is the partial structural schematic diagram disclosed by the present invention;

[0025] Figure 3 is the combined structural schematic diagram of the isolation plate, the first active push rod, the vacuum pumping housing, the air inlet and extraction pipe and the water inlet pipe disclosed by the present invention;

[0026] Figure 4 is the top view disclosed by the present invention;

[0027] Figure 5 is Figure 4 the partial structural schematic diagram of;

[0028] Figure 6 is the state diagram of the filter screen moving to the right disclosed by the present invention;

[0029] Figure 7 is the structural schematic diagram of the filter screen covered by multiple isolation shells disclosed by the present invention;

[0030] Figure 8 Schematic diagram of the combined structure of the second active push rod, connecting block, water pipe, isolation shell, nozzle and waterproof film disclosed in the present invention;

[0031] Figure 9 State diagram of the housing of the present invention covering the pool wall.

[0032] In the above drawings: 1 - housing, 2 - isolation plate, 2a - telescopic plate, 3 - first active push rod, 4 - vacuum pumping housing, 4a - inflatable airbag, 5 - intake and exhaust pipe, 6 - water inlet pipe, 7 - sewage pipe, 8 - standing plate, 9 - identification camera, 10 - liquid discharge assembly, 101 - first vertical plate, 102 - second vertical plate, 103 - baffle, 104 - filter screen, 105 - motor, 106 - filter plate, 201 - second active push rod, 202 - connecting block, 203 - water pipe, 203a - pump, 204 - isolation shell, 205 - nozzle, 206 - waterproof film. Specific embodiments

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0034] Embodiment 1: An underground water purification plant pool wall repair device with an isolation function, as Figures 1-3 、 Figure 9 shown, including a housing 1, an isolation plate 2, a first active push rod 3 and a vacuum pumping housing 4; openings are provided on the upper side and the front side of the housing 1; an isolation plate 2 arranged in a U shape is fixedly connected to the rear side inside the housing 1; a telescopic plate 2a is provided in the middle of the isolation plate 2, and a first active push rod 3 is fixedly connected to the isolation plate 2. The telescopic part and the fixed part of the first active push rod 3 are respectively fixedly connected to both sides of the telescopic plate 2a, and the telescopic plate 2a is driven to stretch and contract by the first active push rod 3; a vacuum pumping housing 4 is installed on the front side of the isolation plate 2, and the vacuum pumping housing 4 is brought into contact with the pool wall and evacuated, so that a water - impermeable space for workers to work can be formed between the rear wall inside the housing 1 and the U - shaped isolation plate 2 and the pool wall;

[0035] It further includes an intake and exhaust pipe 5, a water inlet pipe 6 and a sewage pipe 7; an intake and exhaust pipe 5 is communicated with the upper side of the vacuum pumping housing 4, and air is sent into and evacuated from the vacuum pumping housing 4 through the intake and exhaust pipe 5; a water inlet pipe 6 is communicated with the upper side of the vacuum pumping housing 4, and water is pumped into the vacuum pumping housing 4 through the water inlet pipe 6; a sewage pipe 7 is installed on the lower side of the vacuum pumping housing 4.

[0036] The bottom of the sewage pipe 7 is 1 cm away from the bottom inside the vacuum pumping housing 4, so that the sewage pipe 7 can better pump away the liquid and debris inside the vacuum pumping housing 4.

[0037] It further includes an inflatable airbag 4a, and an inflatable airbag 4a is arranged on the front side of the vacuum pumping housing 4.

[0038] It also includes a standing board 8, and the standing board 8 is fixedly connected to the inner rear side of the housing 1.

[0039] It also includes an identification camera 9, and the identification camera 9 is installed on the top of the housing 1.

[0040] It also includes a liquid drainage component 10, and the liquid drainage component 10 is installed at the bottom of the housing 1. Through the liquid drainage component 10, the water in the housing 1 is drained outside the housing 1.

[0041] When the present invention works, first, the present invention is transferred to the purification pool by a hoisting device or a mobile device, and the hoisting device or the mobile device drives the present invention to move subsequently;

[0042] First, make the front side opening of the housing 1 face the pool wall, cover the housing 1 on the pool wall, as Figure 9 shown in the state. Then, control the hoisting device or the mobile device to drive the present invention to move along the pool wall. Since the housing 1 is in contact with the pool wall, the housing 1 always covers the pool wall, thereby reducing the water in the purification pool from flowing into the housing 1. So that the present invention can work with water, and part of the water seeping into the housing 1 can be sucked out of the housing 1 through the liquid drainage component 10, thus ensuring that there is little water in the housing 1. For example, the water depth in the housing 1 is maintained at 1 cm - 2 cm, so as to facilitate the identification camera 9 to observe the pool wall during the movement of the present invention.

[0043] Furthermore, when the identification camera 9 finds that the pool wall needs to be repaired, as Figure 1 shown, the hoisting device or the mobile device stops driving the present invention to move. Then, control the telescopic part of the first active push rod 3 to push out, stretch the telescopic plate 2a, cover the vacuum pumping housing 4 on the pool wall, and then control the air inlet and vacuum pumping pipe 5 to evacuate the air in the vacuum pumping housing 4, so that the vacuum pumping housing 4 is adsorbed on the pool wall, so that an impermeable space for workers to work can be formed between the inner rear wall of the housing 1, the U-shaped isolation plate 2 and the pool wall. Workers can enter the present invention from the upper side opening and stand on the standing board 8 to repair the broken pool wall. In this way, the present invention forms an impermeable space for workers to work between the inner rear wall of the housing 1, the U-shaped isolation plate 2 and the pool wall, avoiding a large amount of water seepage during the repair process that may affect the repair work of workers only relying on the housing 1 without sealing treatment.

[0044] It should be noted that since the present invention works with water, there will be some sundries on the vacuum pumping housing 4, and the sundries will affect the vacuum pumping effect of the vacuum pumping housing 4 or cause blockage of the air inlet and vacuum pumping pipe 5 (or air pump). Specifically, because there will be adhesives on the pool wall, although the adhesives can be scraped off through structures such as a scraper, there will still be sundries remaining on the pool wall. After the vacuum pumping housing 4 contacts the pool wall, these sundries will adhere to the vacuum pumping housing 4.

[0045] Therefore, before evacuating the vacuum of the vacuum evacuation housing 4, after the vacuum evacuation housing 4 is placed over the pool wall, first control the water inlet pipe 6 to send a large amount of water into the vacuum evacuation housing 4, and wash away the sundries inside the vacuum evacuation housing 4 through the water. At this time, control the inflatable airbag 4a to deflate to a flat state, so that there is a gap between the inflatable airbag 4a and the pool wall. Then, the water sent into the vacuum evacuation housing 4 by the water inlet pipe 6 can seep out from the gap between the inflatable airbag 4a and the pool wall, washing away the sundries between the inflatable airbag 4a and the pool wall. The generated sewage is discharged through the sewage pipe 7 and the liquid discharge assembly 10. After that, control the air inlet and extraction pipe 5 to send air into the vacuum evacuation housing 4, and use the air to blow away the water inside the vacuum evacuation housing 4 and the water between the inflatable airbag 4a and the pool wall. Then control the inflatable airbag 4a to inflate and expand, so that the inflatable airbag 4a is in full contact with the pool wall. Then control the air inlet and extraction pipe 5 to extract air, realizing the vacuum evacuation work of the vacuum evacuation housing 4 on the pool wall. In this way, the present invention can ensure the cleanliness of the vacuum evacuation housing 4 during water-carrying operation, and at the same time ensure the full contact between the inflatable airbag 4a and the pool wall, so as to achieve a stable vacuum adsorption effect on the pool wall, enabling workers to safely carry out repair work on the pool wall within the present invention.

[0046] Embodiment 2: On the basis of Embodiment 1, as Figures 1-9 shown, it further includes a first vertical plate 101, a second vertical plate 102, a baffle 103, a collection assembly, a motor 105 and a filter plate 106; the right front side of the housing 1 is fixedly connected with the first vertical plate 101 and the second vertical plate 102 which are arranged in parallel, and the second vertical plate 102 is located at the right rear of the first vertical plate 101; the front side of the first vertical plate 101 is fixedly connected with the baffle 103, and a large amount of water is isolated outside the housing 1 through the baffle 103; a collection assembly is arranged between the first vertical plate 101 and the second vertical plate 102, and the adhesives are collected through the collection assembly; the upper part of the right front side of the housing 1 is provided with the motor 105; at least 6 filter plates 106 are installed on the long rotating shaft of the motor 105, and the filter plates 106 are detachably connected.

[0047] Among them, the contact side of the baffle 103 with the pool wall is made of rubber material; the filter plates 106 are annularly and equidistantly distributed, and the two filter plates 106 located on the front and rear sides can block the opening on the right front side of the housing 1.

[0048] The collection component is the filter screen 104, and the filter screen 104 slides between the first vertical plate 101 and the second vertical plate 102; it further includes a second active push rod 201, a connecting block 202, a water pipe 203, an isolation shell 204, and a nozzle 205; a plurality of second active push rods 201 are installed on the right side plate of the housing 1; the telescopic part of the second active push rod 201 is fixedly connected to the connecting block 202; the connecting block 202 is fixedly connected with a water pipe 203 on the upper side, and a pump 203a is provided on the water pipe 203 to pump and suck water; the left side of the water pipe 203 is fixedly connected to the isolation shell 204, and the isolation shell 204 covers and is fixedly connected to the left side of the filter screen 104; the right side of the water pipe 203 is fixedly connected to the nozzle 205, the nozzle 205 faces the filter plate 106, and the left side of the nozzle 205 is arc-shaped.

[0049] It further includes a waterproof film 206, and a waterproof film 206 is connected between the housing 1 and the water pipe 203. When the water pipe 203 moves left and right, the waterproof film 206 prevents the water in the water purification tank from entering the housing 1.

[0050] Considering that after the water purification tank is used for a long time, there will be adhesives on its pool wall. If not cleaned, it will affect the vacuum pumping work of the vacuum pumping housing 4 and the repair work of the pool wall. Based on this, the present invention proposes the following solutions:

[0051] As Figure 1 、 Figure 4 、 Figure 5 As shown in

[0052] When the present invention works and moves to the right, the adhesives on the pool wall are scraped off by the filter plate 106 and intercepted on the right side of the filter plate 106. After the filter plate 106 scrapes the adhesives on the pool wall for a certain distance, adhesives will accumulate on its right side. At this time, the movement of the present invention can be controlled to stop, and then the motor 105 can be controlled to drive the filter plate 106 to rotate clockwise, replacing the next filter plate 106 to scrape the adhesives on the pool wall. By repeating this way, all the filter plates 106 can gradually scrape the adhesives on the pool wall.Further, while the filter plate 106 scrapes the adhesion on the pool wall, the pump 203a is controlled to operate, so that the water in the water pipe 203 is sent out from the nozzle 205 and inhaled from the isolation shell 204; for the filter plate 106, there is a water flow to the left, so that the adhesion scraped from the pool wall can continuously stay on the right side of the filter plate 106 instead of floating in the purification pool; further, the water flow to the left can also wash away the adhesion on the filter plate 106 on the left side of the motor 105 and move it towards the filter screen 104; further, the water flow to the left can also wash the adhesion between the first vertical plate 101 and the second vertical plate 102 towards the filter screen 104 for collection, avoiding the adhesion from floating, and at the same time avoiding the adhesion from being carried out into the purification pool when the filter plate 106 rotates clockwise. In this way, the present invention can perform a long-distance scraping operation on the adhesion on the pool wall by rotating multiple filter plates 106. At the same time, the water flow to the left, on the one hand, can make the scraped adhesion stay on the right side of the filter plate 106, avoiding the adhesion from floating in the purification pool after being scraped, on the other hand, can realize the self-cleaning work of the adhesion on the filter plate 106 on the left side of the motor 105, and on the other hand, can also realize washing the adhesion onto the filter screen 104 for collection.

[0053] Further, after the repair work on the pool wall is completed and the present invention is transferred to the cleaning pool for cleaning, the telescopic part of the second active push rod 201 can be controlled to push the connecting block 202, the water pipe 203, the isolation shell 204, and the nozzle 205 to move to the right, so that it changes from Figure 5 to Figure 6 During the transformation, the filter screen 104 moves to the right under the drive of the isolation shell 204, so that the arc-shaped filter screen 104 is within the rotation range of the filter plate 106. Then, the motor 105 is controlled to drive the filter plate 106 to rotate, and the adhesion collected by the filter screen 104 is scraped and transferred out by using the filter plate 106. At the same time, flushing water from top to bottom can quickly wash away the adhesion; at the same time Figure 6 In the state, the rotation of the filter screen 104 can scrape the adhesion at the nozzle of the nozzle 205, so that the self-cleaning work of the present invention can be realized.

[0054] It should be noted that the first active push rod 3 and the second active push rod 201 can be pneumatic push rods, and the liquid discharge assembly 10 can be a water pump.

[0055] It should be understood that this embodiment is only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. An underground water purification plant pool wall repair device with isolation function, comprising a housing (1), an isolation plate (2), a first active push rod (3) and a vacuum pumping housing (4); the rear side inside the housing (1) is fixedly connected with an isolation plate (2) arranged in a U shape; the middle part of the isolation plate (2) has a telescopic plate (2a), and a first active push rod (3) is fixedly connected to the isolation plate (2), and the telescopic plate (2a) is driven by the first active push rod (3) to stretch and contract; a vacuum pumping housing (4) is installed on the front side of the isolation plate (2), and the vacuum pumping housing (4) contacts the pool wall and pumps out the air. It is characterized in that: It further comprises an air intake and pumping pipe (5), a water inlet pipe (6) and a sewage discharge pipe (7); the upper side of the vacuum pumping housing (4) is communicated with the air intake and pumping pipe (5); the upper side of the vacuum pumping housing (4) is communicated with the water inlet pipe (6); the lower side of the vacuum pumping housing (4) is installed with the sewage discharge pipe (7). It further comprises a first vertical plate (101), a second vertical plate (102), a baffle plate (103), a collection assembly, a motor (105) and a filter plate (106); the right front side of the housing (1) is fixedly connected with a first vertical plate (101) and a second vertical plate (102) which are arranged in parallel, and the second vertical plate (102) is located at the right rear of the first vertical plate (101); the front side of the first vertical plate (101) is fixedly connected with the baffle plate (103); a collection assembly is arranged between the first vertical plate (101) and the second vertical plate (102) to collect the adherents; the upper part of the right front side of the housing (1) is installed with the motor (105); at least 6 filter plates (106) are installed on the long rotating shaft of the motor (105). The collection assembly is a filter screen (104), and the filter screen (104) slides between the first vertical plate (101) and the second vertical plate (102); it further comprises a second active push rod (201), a connecting block (202), a water pipe (203), an isolation shell (204) and a spray head (205); a plurality of second active push rods (201) are installed on the right side plate of the housing (1); the telescopic part of the second active push rod (201) is fixedly connected with the connecting block (202); the upper side of the connecting block (202) is fixedly connected with the water pipe (203), and a pump (203a) is arranged on the water pipe (203) to pump water; the left side of the water pipe (203) is fixedly connected with the isolation shell (204), and the isolation shell (204) covers the left side of the filter screen (104) and is fixedly connected with it; the right side of the water pipe (203) is fixedly connected with the spray head (205), and the spray head (205) faces the filter plate (106).

2. The underground water purification plant pool wall repair device with an isolation function according to claim 1, characterized in that: The bottom of the sewage discharge pipe (7) is 1 cm away from the inner bottom of the vacuum pumping housing (4).

3. The underground water purification plant pool wall repair device with an isolation function according to claim 1, characterized in that: It further comprises an inflatable airbag (4a), and the inflatable airbag (4a) is arranged on the front side of the vacuum pumping housing (4).

4. The underground water purification plant pool wall repair device with an isolation function according to claim 1, characterized in that: It further comprises a standing plate (8), and the standing plate (8) is fixedly connected to the rear side inside the housing (1).

5. The underground water purification plant pool wall repair device with an isolation function according to claim 1, characterized in that: It further comprises an identification camera (9), and the identification camera (9) is installed on the top of the housing (1).

6. The wall repair device for an underground water purification plant with an isolation function according to claim 1, wherein: It further comprises a liquid discharge assembly (10), and the liquid discharge assembly (10) is installed at the bottom of the housing (1) to discharge the water inside the housing (1) to the outside of the housing (1).

7. A repair device for the pool wall of an underground water purification plant with an isolation function according to claim 1, characterized in that: The side of the baffle plate (103) contacting the pool wall is made of rubber material.

8. The underground water purification plant pool wall repair device with an isolation function according to claim 1, characterized in that: It further includes a waterproof membrane (206). A waterproof membrane (206) is connected between the housing (1) and the water pipe (203). When the water pipe (203) moves left and right, the waterproof membrane (206) prevents the water in the water purification tank from entering the housing (1).

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