Fabricated house building anti-leakage detection device and method

Abstract

The invention relates to an anti-leakage detection device and method for a fabricated house building. The anti-leakage detection device comprises a shell, moving wheels, a driving assembly, a sealing cover, a spring telescopic rod, an air pressure detection meter and an air pressure adjusting assembly. The middle of the shell is telescopically connected with a sealing cover through a spring telescopic rod, and the interior of the sealing cover is hollow and provided with a cavity. The moving wheels are arranged at the bottom of the shell through a rotating shaft, the driving assembly comprises driving wheels and driving seats, the driving wheels are fixedly arranged on the rotating shaft in a sleeving mode, the driving seats are arranged on the two sides of the sealing cover and correspond to the driving wheels, and according to walking of the moving wheels, the sealing cover is buckled on a detection seam in the bottom in a sealed mode. An air pressure detection meter and an air pressure adjusting assembly are arranged on the sealing cover. The moving wheel is used as a power source, and the sealing cover is driven to accurately cover the detection seam through linkage of the rotating shaft and the driving assembly. The sealing cover is filled with high-pressure gas, and the air pressure detection meter is combined to evaluate the sealing performance, so that the anti-leakage state of the detection seam is quickly judged.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and in particular to an anti-leakage detection device and method for assembled house buildings. Background Art

[0002] With the increasing awareness of energy conservation and environmental protection and the development of the construction industry, prefabricated buildings are becoming more and more popular in the market. Prefabricated concrete buildings refer to concrete structure buildings that are mainly designed and constructed through on-site assembly using factory-produced prefabricated reinforced concrete components.

[0003] In the prior art, prefabricated concrete exterior walls are widely used in the construction of prefabricated concrete buildings. However, due to the poor integration between prefabricated concrete exterior walls and other prefabricated parts, after the prefabricated concrete exterior walls are built, workers are usually required to carefully observe whether there is leakage in the prefabricated concrete exterior walls. At the same time, since the connection points and joints between components are prone to penetration problems, there are hidden dangers to the quality of the building and the use of safety belts. Therefore, penetration detection and treatment have become an important link to ensure the quality and effect of prefabricated buildings.

[0004] The current detection method is to introduce special gas into the house, such as the invention patent with patent number 202310585736.9, which discloses a method and system for monitoring the leakage of prefabricated house buildings, which belongs to the field of intelligent buildings and intelligent operation and maintenance technology, including: establishing a CFD simulation model of prefabricated house buildings and performing simulation calculations; conducting wind tunnel tests on prefabricated house buildings to verify the simulation calculation results; combining the simulation calculation results, wind tunnel test results, local historical climate data, and relevant data analysis of cracks in similar building structures to obtain the locations that need leakage monitoring and deploy corresponding leakage monitoring sensors; combining the monitoring data monitored by the leakage monitoring sensors and the above-mentioned different types of data for comprehensive analysis to obtain leakage warning information; establishing a BIM model of the prefabricated house building to achieve real-time dynamic display.

[0005] The current detection method is the overall anti-leakage monitoring in the house, which basically uses the pressure difference to leak from one side to the other side and conducts detection. This method is complicated to operate and has high cost, and cannot meet people's needs. Based on this, it is necessary to study an anti-leakage detection device and method for assembled house buildings. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a prefabricated house building anti-leakage detection device and method, which effectively solves the problems of complex operation and high cost of existing prefabricated house building anti-leakage detection devices.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an anti-leakage detection device for assembled house buildings, comprising a shell, a moving wheel, a driving assembly, a sealing cover, a spring telescopic rod, an air pressure detection gauge and an air pressure regulating assembly; the middle part of the shell is telescopically connected to the sealing cover through the spring telescopic rod, the interior of the sealing cover is hollow and has a cavity; the moving wheel is arranged at the bottom of the shell through a rotating shaft, and the driving assembly comprises a driving wheel and a driving seat, wherein the driving wheel is fixedly sleeved on the rotating shaft, and the driving seat is configured on both sides of the sealing cover and corresponds to the driving wheel, and according to the movement of the moving wheel, the sealing buckle of the sealing cover is installed on the detection seam at the bottom, and the sealing cover is provided with an air pressure detection gauge and an air pressure regulating assembly.

[0008] Furthermore, the shell is an inverted U-shaped structure, and movable wheels are arranged on both the front and rear sides of the shell, and the sealing cover is arranged between the two movable wheels.

[0009] Furthermore, a pressure applying portion is arranged on the shell.

[0010] Furthermore, the pressure-applying portion is a counterweight or a handle disposed on the shell.

[0011] Furthermore, the pressure-applying portion includes an iron block and a magnetic belt, the iron block is arranged on the moving wheel, and the magnetic belt is relatively arranged on two sides of the detection gap.

[0012] Furthermore, a positioning assembly is provided between the shell and the sealing cover, and the positioning assembly includes a positioning block and a positioning seat. The positioning seat is fixed on the shell and is provided with a positioning groove. The positioning block is fixed on the sealing cover and is adapted to be nested in the positioning groove.

[0013] Furthermore, the driving wheel includes a notched gear fixedly mounted on the rotating shaft, and the driving seat includes a rack and a reversing gear set; the racks are correspondingly arranged on both sides of the sealing cover and mesh with the notched gears on the corresponding sides, wherein the notched gear on one side is directly fixed on the rotating shaft, and the notched gear on the other side is connected to the rotating shaft through the reversing gear set.

[0014] Furthermore, the driving wheel includes two cams of the same size, the cams are fixed on the rotating shaft respectively, the driving seat includes a fixing plate and a pressure plate, the pressure plate is fixed on the sealing cover through the fixing plate, and the pressure plate is located at the bottom of the cams.

[0015] Furthermore, the spring telescopic rod includes a sleeve, a cover body, a spring, a telescopic rod, a baffle, an end plate and a detection plate. The telescopic rod is provided with a baffle, and the bottom of the baffle is fixed on the sealing cover. The sleeve is fixed on the shell, and the baffle is adapted to be mounted in the sleeve. The cover body closes the end of the sleeve, and a spring is arranged between the baffle and the cover body. The detection plate is fixed on the shell, and the end is fixed to the end of the telescopic rod. The detection plate corresponds to the end plate, and a pressure touch switch is arranged between the two. The pressure touch switch is triggered due to the contact between the end plate and the detection plate, and sends an inflation command to the air pressure regulating component. The air pressure regulating component inflates the sealing cover and maintains the pressure, and the air pressure change in the sealing cover is detected by the air pressure detection gauge.

[0016] A method for detecting leakage of assembled building structures, comprising the following steps; Step 1: Mark the detection joint of the prefabricated house building and clean both sides of the detection joint; Step 2, placing the moving wheels on both sides of the detection gap, and then moving the moving wheels; Step 3: During the movement of the moving wheel, the sealing cover is moved up and down by the driving component, so that the sealing buckle of the sealing cover is installed on the detection seam. When the sealing cover is in a sealed state, air is injected into the sealing cover through the air pressure regulating component, and the pressure is maintained for a set time; Step 4, record the reading of the air pressure tester; Step 5: Continue to drive the moving wheel to move, the sealing cover leaves the sealing state, and moves to the next detection point driven by the moving wheel, and repeat steps 3 to 4.

[0017] The beneficial effect of the above technical solution is: the present invention pre-selects and determines the locations that are prone to leakage, such as the connections and splicing between the assembled wall panels. After knowing the detection seam, the present invention uses a movable sealing cover to perform targeted sealing detection on the detection seam, thereby realizing the overall detection of the detection seam. The structure has the characteristics of compact structure, simple operation, convenient recording, and strong targeting. It can quickly detect the airtightness of the detection seam without the need to arrange complex sensors, greatly improving the detection efficiency and reducing the detection cost.

[0018] In the specific structure, the present invention uses a moving wheel as the moving basis and utilizes a rotating shaft for linkage, so that the moving wheel generates a driving force during the movement. The driving force is converted through the power of the driving component to make the sealing cover move up and down in the shell. After moving downward to the extreme position, the sealing cover is in a sealed state. In this state, the sealing cover body is inflated through the air pressure regulating component, and the sealing cover is filled with high-pressure gas. The internal pressure is detected by the air pressure detection gauge, and then the pressure maintenance condition of the sealing cover is judged, and then the sealing state of the detection seam is obtained, thereby evaluating the anti-leakage state of the detection seam.

[0019] In the structure of the driving component, a notched gear or a cam structure is used to realize power transmission, and a downward driving force is applied to the sealing cover from both sides, so that the sealing cover automatically moves downward under pressure, and the position of the sealing cover is judged by the contact opening, thereby providing a start signal for the operation of the air pressure regulating component.

[0020] At the same time, when the present invention is implemented, the movement of the moving wheel is used as the translational force of the sealing cover. By designing the wheel diameter and the drive component structure of the moving wheel, after the moving wheel rotates one circle, the sealing cover translates one position, thereby realizing the continuous sealing detection of the detection gap.

[0021] The present invention designs a portable and efficient sealing detection device for leak-prone locations such as the joints of assembled wall panels. The device uses a moving wheel as a power source, and is linked to a driving assembly through a rotating shaft to drive a sealing cover to accurately cover the detection seam. The sealing cover is filled with high-pressure gas, and the sealing is evaluated in combination with an air pressure test gauge, so as to quickly determine the anti-leakage status of the detection seam. Its ingenious structural design ensures the simplicity of operation, the pertinence and continuity of detection, greatly improving detection efficiency and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the implementation structure of the present invention; Figure 2 for Figure 1 A side view structural schematic diagram of; Figure 3 for Figure 1 Schematic diagram of the structure viewed from above; Figure 4 It is a schematic diagram of the main structure of the present invention; Figure 5 A schematic diagram of an implementation structure of a drive component; Figure 6 is another structural schematic diagram of a drive component; Figure 7 It is a schematic diagram of the implementation structure of the positioning component; Figure 8 It is a schematic diagram of the implementation structure of the spring telescopic rod; Fig. 9 This is a usage state diagram of the present invention.

[0023] Figure markings: 1-shell, 2-moving wheel, 3-rotating shaft, 4-driving wheel. 41-notched gear, 42-cam, 5-driving seat, 51-driving gear, 52-transmission gear, 53-fixed plate, 52-pressure plate, 6-sealing cover, 61-sealing body, 62-cavity, 7-spring telescopic rod, 71-sleeve, 72-telescopic rod, 73-cover body, 74-baffle, 75-spring, 76-end plate, 77-detection plate, 8-positioning block, 9-positioning seat, 10-positioning groove, 11-air pressure detection gauge, 12-air pressure adjustment assembly, 13-handle, 14-magnetic belt, 15-iron block. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Embodiment 1, this embodiment aims to provide a prefabricated house building anti-leakage detection device, which is mainly used to detect the sealing of the detection seam. This embodiment takes a long linear detection seam as an example for explanation. The current detection method is to introduce special gas, such as high-pressure gas, high-temperature gas or low-temperature gas, into the house as a whole, and obtain the corresponding parameter changes of the detection seam through the sensor to realize the detection of the house leakage. The structure still needs to know the position of the detection seam in advance, and then configure the sensor in a targeted manner. There are problems such as complex operation, great construction difficulty and high cost. In order to simplify the construction steps, improve construction efficiency and reduce construction costs, this embodiment provides a prefabricated house building anti-leakage detection device.

[0025] like Figure 1-4 As shown in the figure, an anti-leakage detection device for assembled house buildings includes a shell 1, a movable wheel 2, a driving assembly, a sealing cover 6, a spring telescopic rod 7, an air pressure detection gauge 11 and an air pressure regulating assembly 12; this embodiment adopts a mobile sealing detection device to realize targeted detection of splicing seams and structural joints, and replaces the current unified detection with small-area detection, thereby reducing labor intensity and realizing anti-leakage monitoring of assembled house buildings.

[0026] In the implementation structure, the middle part of the shell 1 is telescopically connected to the sealing cover 6 through the spring telescopic rod 7. The spring telescopic rod 7 includes a sleeve 71, a cover body 73, a spring 75, a telescopic rod 72, a baffle 74, an end plate 76 and a detection plate 77. The telescopic rod 72 is provided with a baffle 74, the bottom of which is fixed on the sealing cover 6, the sleeve is fixed on the shell 1, the baffle 74 is adapted to be mounted in the sleeve 71, the cover body 73 closes the end of the sleeve, and a spring 75 is arranged between the baffle 74 and the cover body 73, the detection plate 77 is fixed on the shell 1, and the end is fixed to the end of the telescopic rod. The detection plate 77 corresponds to the end plate 76, and a pressure touch switch is arranged between the two. The pressure touch switch is triggered due to the contact between the end plate and the detection plate, and an inflation command is issued to the air pressure regulating component 12. The air pressure regulating component 12 inflates the sealing cover 6 to form a positive pressure or exhausts air to form a negative pressure, and maintains the pressure, and the air pressure change in the sealing cover 6 is detected by the air pressure detection gauge 11.

[0027] In the specific structure, the shell 1 is an inverted U-shaped structure, the interior of the sealing cover 6 is hollow and has a cavity 62, and the sealing cover 6 is a lower opening structure. In order to ensure the sealing effect, the lower part of the sealing cover 6 has a flexible sealing body 61, which is used to be buckled on the detection seam and seal the surrounding of the detection seam. In order to detect the sealed state, this embodiment adopts airtight detection, and an air pressure detection gauge 11 and an air pressure adjustment component 12 are set on the sealing cover 6.

[0028] Structurally, moving wheels 2 are provided on both the front and rear sides of the shell 1, and the sealing cover 6 is provided between the two moving wheels 2. The moving wheels 2 are arranged at the bottom of the shell 1 through a rotating shaft. During implementation, four moving wheels 2 are provided (two on the front side and two on the rear side), and the smooth operation of the shell 1 is ensured by the four moving wheels 2.

[0029] The driving assembly includes a driving wheel 4 and a driving seat 5, wherein the driving wheel 4 is fixedly mounted on the rotating shaft 3, and the driving seat 5 is arranged on both sides of the sealing cover 6 and corresponds to the driving wheel. According to the movement of the moving wheel 2, the sealing cover 6 is sealed and buckled on the detection seam at the bottom, and the sealing cover 6 is provided with an air pressure detection gauge 11 and an air pressure regulating assembly 12. During implementation, the air pressure regulating assembly 12 is an inflating or exhausting structure, wherein the inflating structure can be an air pump, and the exhausting assembly is a vacuum pump. The corresponding air pipe, valve and controller structure are used to perform inflating and exhausting control, so that the sealing cover 6 is in a high-pressure or low-pressure environment, which is different from the natural environment. Through the air pressure changes in the sealing cover 6, the air pressure detection gauge 11 is used to detect its internal pressure, and then the pressure maintenance condition of the sealing cover 6 is judged, and then the sealing state of the detection seam is obtained, so as to evaluate the anti-leakage state of the detection seam.

[0030] The driving wheel 4 includes a notched gear 41 fixedly mounted on the rotating shaft, and the driving seat 5 includes a rack 51 and a reversing gear set; the racks are correspondingly arranged on both sides of the sealing cover 6 and mesh with the notched gears 41 on the corresponding sides, wherein the notched gear 41 on one side is directly fixed on the rotating shaft 3, and the notched gear on the other side is connected to the rotating shaft through the reversing gear set. During operation, the rotation direction of the rotating shaft is the same. In order to ensure the consistency of the synchronous drive, the direction is changed by the reversing gear. During implementation, the reversing gear can be arranged on the inner wall of the shell 1, which specifically includes a driving gear 51 and a transmission gear 52, wherein the driving gear 51 is fixedly mounted on the rotating shaft 3, and the transmission gear 52 and the notched gear 41 are arranged on the inner wall of the shell 1 through the same rotating shaft. When the driving gear rotates, power is transmitted to the transmission gear, and the transmission gear and the notched gear have the same direction of rotation to realize power conversion.

[0031] A pressure-applying portion is disposed on the housing 1 , and the pressure-applying portion is a counterweight or a handle 13 disposed on the housing 1 . The pressure-applying portion can actively apply a stabilizing force to the housing 1 to ensure structural stability.

[0032] In order to ensure the structural stability of the sealing cover 6, a positioning assembly is arranged between the shell 1 and the sealing cover 6, and the positioning assembly includes a positioning block 8 and a positioning seat 9. The positioning seat 9 is fixed on the shell 1, and a positioning groove 10 is arranged on the positioning seat. The positioning block is fixed on the sealing cover 6 and is adapted to be nested in the positioning groove 10.

[0033] A method for detecting leakage of assembled building structures, comprising the following steps; Step 1: Mark the detection joint of the prefabricated house building and clean both sides of the detection joint; Step 2, placing the moving wheels 2 on both sides of the detection gap, and then moving the moving wheels 2; Step 3: During the movement of the moving wheel 2, the sealing cover 6 is moved up and down by the driving component, so that the sealing cover 6 is sealed and mounted on the detection seam. When the sealing cover 6 is in a sealed state, air is injected into the sealing cover 6 through the air pressure regulating component 12, and the pressure is maintained for a set time; Step 4, record the reading of the air pressure detection meter 11; Step 5: Continue to drive the moving wheel 2 to move, the sealing cover 6 leaves the sealing state, and moves to the next detection point driven by the moving wheel 2, and repeat steps 3 to 4.

[0034] This embodiment is aimed at leakage detection of prefabricated houses. Before use, the locations prone to leakage are pre-selected and judged, such as the joints and splicing between prefabricated wall panels. After knowing the detection seam, a movable sealing cover 6 is used to perform targeted sealing detection on the detection seam. The movable wheel 2 is used as a power source, and the sealing cover 6 is driven to accurately cover the detection seam through the linkage of the rotating shaft and the driving component. The sealing cover 6 is filled with high-pressure gas or negative-pressure gas, and the sealing is evaluated in combination with the air pressure detection meter 11, so as to quickly judge the anti-leakage state of the detection seam and realize the overall detection of the detection seam. The structure has the characteristics of compact structure, simple operation, convenient recording, and strong targeting. It can quickly detect the sealing of the detection seam without the need to arrange complex sensors, which greatly improves the detection efficiency and reduces the detection cost.

[0035] Embodiment 2: This embodiment further illustrates the structure of the pressure applying portion.

[0036] In this embodiment, the pressure applying part includes an iron block 15 and a magnetic belt 14. The iron block 15 is arranged on the moving wheel 2, and the magnetic belt 14 is relatively arranged on both sides of the detection gap.

[0037] This embodiment uses a magnetic attraction structure to further enhance the stability of the movement of the moving wheel 2 during implementation, ensuring that the moving wheel 2 can move smoothly on both sides of the detection gap. In the implementation, the moving wheel 2 moves a distance D1 after one rotation, and the width of the sealing cover is D2. In order to improve efficiency, D1 is set to be no greater than D2, and preferably the two are set to be equal, so that the detection gap can be used as the detection object and multiple continuous measurements can be performed.

[0038] Embodiment 3: This embodiment further illustrates the structure of the driving assembly.

[0039] In this embodiment, the driving wheel includes two cams 42 of the same size, and the cams 42 are fixed on the rotating shaft 3 accordingly. The driving seat includes a fixing plate 52 and a pressure plate 53. The pressure plate 53 is fixed on the sealing cover 6 through the fixing plate, and the pressure plate 53 is at the bottom of the cam 42.

[0040] The present embodiment adopts a cam structure, which has a raised structure that is symmetrical about the center. Regardless of whether the structure rotates forward or reverse, it will automatically apply a downward force to the pressure plate after one rotation, so that there is no need to provide reversing. A downward driving force can be formed on both sides of the sealing cover 6 to move the sealing cover 6 downward and reset it through the spring telescopic rod. The structural configuration is relatively simple.

[0041] The embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. The basic concept of the present invention is to provide a portable and efficient sealing detection device. The device uses a moving wheel as a power source, which is linked to the driving assembly through a rotating shaft to drive the sealing cover to accurately cover the detection gap. The sealing cover is filled with high-pressure gas, and the sealing is evaluated in combination with an air pressure detection gauge, so as to quickly determine the anti-leakage status of the detection gap. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An anti-leakage detection device for assembled building construction, characterized in that: It includes a shell, a moving wheel, a driving component, a sealing cover, a spring telescopic rod, an air pressure detection gauge and an air pressure regulating component; the middle part of the shell is telescopically connected to the sealing cover through the spring telescopic rod, the interior of the sealing cover is hollow and has a cavity; the moving wheel is arranged at the bottom of the shell through a rotating shaft, and the driving component includes a driving wheel and a driving seat, wherein the driving wheel is fixedly sleeved on the rotating shaft, and the driving seat is configured on both sides of the sealing cover and corresponds to the driving wheel, and according to the movement of the moving wheel, the sealing buckle of the sealing cover is installed on the detection seam at the bottom, and the sealing cover is provided with an air pressure detection gauge and an air pressure regulating component.

2. The anti-leakage detection device for assembled building construction according to claim 1 is characterized in that: The shell is an inverted U-shaped structure, and moving wheels are arranged on both the front and rear sides of the shell, and the sealing cover is arranged between the two moving wheels.

3. The anti-leakage detection device for assembled building construction according to claim 1 is characterized in that: A pressure applying portion is arranged on the housing.

4. The anti-leakage detection device for assembled building construction according to claim 3 is characterized in that: The pressure applying part is a counterweight or a handle arranged on the shell.

5. The anti-leakage detection device for assembled building construction according to claim 3 is characterized in that: The pressure applying part comprises an iron block and a magnetic belt, wherein the iron block is arranged on the moving wheel, and the magnetic belt is arranged on two sides of the detection gap relatively.

6. The anti-leakage detection device for assembled building construction according to claim 1 is characterized in that: A positioning assembly is arranged between the shell and the sealing cover, and the positioning assembly comprises a positioning block and a positioning seat. The positioning seat is fixed on the shell and is provided with a positioning groove. The positioning block is fixed on the sealing cover and is adapted to be nested in the positioning groove.

7. The anti-leakage detection device for assembled building construction according to claim 1 is characterized in that: The driving wheel includes a notched gear fixedly mounted on the rotating shaft, and the driving seat includes a rack and a reversing gear set; the racks are correspondingly arranged on both sides of the sealing cover and mesh with the notched gears on the corresponding sides, wherein the notched gear on one side is directly fixed on the rotating shaft, and the notched gear on the other side is connected to the rotating shaft through the reversing gear set.

8. The anti-leakage detection device for assembled building construction according to claim 1 is characterized in that: The driving wheel comprises two cams of the same size, and the cams are fixed on the rotating shafts respectively. The driving seat comprises a fixing plate and a pressing plate, and the pressing plate is fixed on the sealing cover through the fixing plate, and the pressing plate is located at the bottom of the cams.

9. The anti-leakage detection device for assembled building construction according to claim 1, characterized in that: The spring telescopic rod includes a sleeve, a cover body, a spring, a telescopic rod, a baffle, an end plate and a detection plate. The telescopic rod is provided with a baffle, and the bottom of the baffle is fixed on the sealing cover. The sleeve is fixed on the shell, and the baffle is adapted to be assembled in the sleeve. The cover body closes the end of the sleeve, and a spring is arranged between the baffle and the cover body. The detection plate is fixed on the shell, and the end is fixed to the end of the telescopic rod. The detection plate corresponds to the end plate, and a pressure touch switch is arranged between the two. The pressure touch switch is triggered due to the contact between the end plate and the detection plate, and an inflation command is sent to the air pressure regulating component. The air pressure regulating component inflates the sealing cover and maintains the pressure, and the air pressure change in the sealing cover is detected by the air pressure detection gauge.

10. The method for detecting leakage of prefabricated building construction according to claim 1, characterized in that: The method comprises the following steps: Step 1: Mark the detection joint of the prefabricated house building and clean both sides of the detection joint; Step 2, placing the moving wheels on both sides of the detection gap, and then moving the moving wheels; Step 3: During the movement of the moving wheel, the sealing cover is moved up and down by the driving component, so that the sealing buckle of the sealing cover is installed on the detection seam. When the sealing cover is in a sealed state, air is injected into the sealing cover through the air pressure regulating component, and the pressure is maintained for a set time; Step 4, record the reading of the air pressure tester; Step 5: Continue to drive the moving wheel to move, the sealing cover leaves the sealing state, and moves to the next detection point driven by the moving wheel, and repeat steps 3 to 4.

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