A moisture-proof water support equipment for foundation pit civil construction and a construction method thereof

Abstract

The application provides a moisture-proof water supporting equipment for foundation pit civil construction and a construction method thereof, which comprises a supporting plate, a cross beam and a supporting frame, further comprises a water absorption assembly and a pull rod assembly fixed to the supporting plate near one side of the foundation pit; the water absorption assembly comprises a water absorption shell, two installation plates symmetrically arranged in the water absorption shell and a water absorption sponge pad fixed to the installation plates, arc-shaped blocks are fixed to the inner sides of the two installation plates, and connecting piles are arranged at the rear ends; the pull rod assembly comprises a pull rod body penetrating through the supporting plate and the water absorption shell, a fixed seat fixed to the outer side of the supporting plate, an operating handle fixed to the outer end of the pull rod body and a hinged seat fixed to the inner end, and the hinged seat is movably connected to the two connecting piles; the operating handle is pulled to guide the two installation plates to be synchronously opened through the hinged seat, the connecting piles and the arc-shaped blocks, so that the water absorption sponge pad is driven to extend and adhere to the side wall of the foundation pit. The application can overcome the defects of the existing foundation pit supporting equipment, such as low assembly efficiency, inconvenient replacement of the moisture-proof water absorption layer and hidden safety hazards.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology in building construction, specifically to a moisture-proof support device and its construction method for foundation pit civil construction. Background Technology

[0002] Foundation pit construction is a fundamental part of building engineering. Foundation pit support, as a core measure to prevent the collapse of the foundation pit sidewalls and ensure construction safety, directly affects the progress and quality of the project. When constructing in areas with high groundwater levels, the foundation pit sidewalls are prone to groundwater seepage and moisture accumulation. This not only leads to long-term dampness and corrosion of the support structure, reducing its service life, but also causes muddy water accumulation at the bottom of the foundation pit, affecting the safety of construction workers and the normal operation of equipment.

[0003] The existing foundation pit moisture-proof support devices have the following main defects: First, they are mostly assembled by welding or loose connection of multiple sets of bolts, lacking a pre-positioning structure, making assembly and alignment difficult, construction period long, and the overall structure inconvenient to disassemble and assemble, making it impossible to quickly adjust the support position; Second, the moisture-proof and water-absorbing structure is mostly fixed adhesive installation, and after the water-absorbing cotton layer is saturated, construction personnel need to enter the foundation pit to replace it, which is high-risk and poses a significant safety hazard. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a moisture-proof support device for foundation pit civil construction.

[0005] The specific technical solution is as follows: A moisture-proof support device for foundation pit construction includes a support plate, a crossbeam, and a support frame. It also includes a water-absorbing assembly and a tie rod assembly fixed to the support plate near the foundation pit. The water-absorbing assembly includes a water-absorbing shell, two mounting plates symmetrically arranged within the water-absorbing shell, and a water-absorbing sponge pad fixed to the mounting plates. Arc-shaped blocks are fixed to the inner sides of both mounting plates, and connecting piles are provided at their rear ends. The tie rod assembly includes a tie rod body penetrating the support plate and the water-absorbing shell, a fixing seat fixed to the outer side of the support plate, an operating handle fixed to the outer end of the tie rod body, and a hinge seat at the inner end. The two ends of the hinge seat are movably connected to the two connecting piles. Pulling the operating handle, guided by the hinge seat and connecting piles and the arc-shaped blocks, causes the two mounting plates to open synchronously, causing the water-absorbing sponge pad to extend and adhere to the side wall of the foundation pit.

[0006] Optionally, each of the multiple support plates has a locking block fixed on one side near the crossbeam. The locking block is movably locked with the crossbeam and fixed by bolts and nuts. The side wall of the locking block is fixed with an ear plate. The top of the support frame has a locking groove. The ear plate is movably locked in the locking groove and fixed by bolts and nuts.

[0007] Optionally, guide sliders are fixed at both the top and bottom of the mounting plate, and a groove is provided at the corresponding position in the inner cavity of the water-absorbing shell, with the guide sliders movably engaged in the groove.

[0008] Optionally, the arc-shaped block is a wedge-shaped block with a wedge angle of 15° to 45°, and the two arc-shaped blocks are symmetrically arranged with their wedge surfaces facing each other.

[0009] Optionally, a sealing ring is provided between the pull rod body and the fixed seat.

[0010] Optionally, the absorbent sponge pad is a polymer absorbent resin composite sponge pad or a polyurethane foam sponge pad.

[0011] Optionally, the operating handle is provided with a locking mechanism, which includes a locking hole on the outer end face of the fixed base and an elastic locking pin on the operating handle.

[0012] Optionally, the support plate is provided with at least two sets of water-absorbing components spaced apart in the vertical direction, and each set of water-absorbing components is provided with a set of tie rod components.

[0013] This invention provides a method for using the aforementioned moisture-proof support equipment for foundation pit civil construction, comprising the following steps: S1. After cleaning and positioning the pit sidewalls, multiple support plates are sequentially fixed to the crossbeam movable clamps using locking blocks and bolts and nuts. S2. Insert the ear plate into the engagement groove at the top of the support frame and secure it with bolts and nuts; S3. Pull the operating handle on the outside of the support plate to drive the tie rod body to pull the two mounting plates through the hinge seat and connecting pile. With the help of the arc block guide, the two mounting plates open synchronously along the slide groove, which drives the water-absorbing sponge pad to extend out of the water-absorbing shell and tightly adhere to the side wall of the pit to continuously absorb water. S4. When the absorbent sponge pad is saturated with water, push the operating handle to retract the two mounting plates and the absorbent sponge pad into the inner cavity of the absorbent shell simultaneously. Open the detachable cover on the outside of the support plate to complete the replacement.

[0014] Optionally, in step S3, after pulling the operating handle to the position, the elastic locking pin is inserted into the locking hole at the corresponding extended position on the fixed base to lock; in step S4, after pushing the operating handle back to the position, the elastic locking pin is inserted into the locking hole at the corresponding retracted position to lock, and the integrity of the sealing ring is checked when replacing the absorbent sponge pad.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention eliminates safety hazards associated with working inside the foundation pit by having the tie rod assembly penetrate the support plate and the operating end located on the outside of the support plate. Construction personnel can complete the entire process of extending, attaching, retracting, and replacing the absorbent sponge pad without entering the pit. Through the coordinated operation of the hinge seat, connecting pile, and arc-shaped wedge guide, the linear motion of the tie rod body is transformed into the synchronous opening of two mounting plates along the sliding groove, achieving a one-pull-and-attach technical effect. This ensures the absorbent sponge pad adheres evenly to the pit sidewall and maximizes the water absorption area. Pre-positioning of the locking block with the crossbeam and the ear plate with the support frame locking groove enables rapid assembly and alignment, significantly shortening the construction cycle. A sealing ring seals the tie rod penetration gap to prevent water leakage, a removable cover facilitates replacement of the absorbent sponge pad on the outside, and a locking mechanism maintains stable operation. These multiple design features collectively enhance the equipment's waterproof and moisture-proof performance, ease of operation, and reliability. Attached Figure Description

[0016] Figure 1 This is a front view of the overall structure of the moisture-proof support equipment for foundation pit civil construction of the present invention; Figure 2 This is a schematic diagram showing the positional relationship between the water absorption component and the pull rod component in this invention; Figure 3 This is a schematic diagram of the interlocking connection structure of the interlocking block, ear plate and support frame in this invention; Figure 4 This is a schematic diagram of the structure of the water-absorbing component in the extended and open state in this invention; Figure 5 This is a schematic diagram of the assembly relationship between the water absorption component and the pull rod component in this invention; Figure 6 This is a schematic diagram of the sliding groove on the water-absorbing shell in this invention.

[0017] The following are the reference numerals in the attached figures: 1. Support plate; 2. Crossbeam; 3. Support frame; 4. Water absorption assembly; 401. Water absorption shell; 402. Mounting plate; 403. Water absorption sponge pad; 404. Arc-shaped block; 405. Guide slider; 406. Slide groove; 407. Connecting pile; 5. Locking block; 6. Ear plate; 7. Tie rod assembly; 701. Tie rod body; 702. Fixing seat; 703. Operating handle; 704. Hinge seat. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0021] like Figures 1 to 6 As shown, the moisture-proof support equipment for foundation pit civil construction in this embodiment includes a support plate 1, a crossbeam 2, a support frame 3, and a water-absorbing component 4 and a tie rod component 7 fixed to the bottom end of the support plate 1 near the foundation pit. The water-absorbing assembly 4 includes a hollow water-absorbing shell 401, two mounting plates 402 symmetrically arranged in the inner cavity of the water-absorbing shell 401, and a water-absorbing sponge pad 403 fixed to the side of the mounting plate 402 facing the foundation pit. An arc-shaped block 404 is fixed to the side of the two mounting plates 402 that are close to each other, and a connecting pile 407 is fixed to the rear end of each. The tie rod assembly 7 includes a tie rod body 701 with one end penetrating through the support plate 1 and the water-absorbing shell 401 and the other end penetrating through the fixing seat 702 fixed to the outside of the support plate 1, an operating handle 703 fixed to the outer end of the tie rod body 701, and a hinge seat 704 fixed to one end of the tie rod body 701 located inside the water-absorbing shell 401. The two ends of the hinge seat 704 are movably connected to the two connecting piles 407 by pins. Specifically, when water seepage and moisture appear on the sidewall of the foundation pit, the construction workers pull the operating handle 703 on the outside of the support plate 1, causing the tie rod body 701 to move outward along the fixed seat 702. The hinge seat 704 at the front end of the tie rod body 701 pulls the connecting pile 407 at the rear end of the two mounting plates 402 through the pin. When the two mounting plates 402 approach each other, the wedge surfaces of the two arc-shaped blocks 404 contact and generate a guiding effect, forcing the two mounting plates 402 to open synchronously to both sides, causing the water-absorbing sponge pad 403 to extend. The water-absorbing shell 401 fits tightly against the side wall of the pit and continuously absorbs water. When the water-absorbing sponge pad 403 is saturated with water, the operating handle 703 is pushed to move the tie rod body 701 inward. The hinge seat 704 pushes the two connecting piles 407 in the opposite direction. The two mounting plates 402 separate along the wedge surface of the arc block 404 and then retract and move closer together, causing the water-absorbing sponge pad 403 to retract into the inner cavity of the water-absorbing shell 401. The replacement can be completed on the outside of the support plate 1 without entering the pit, thus completely eliminating the safety hazards of working inside the pit.

[0022] like Figure 1 and Figure 5As shown, multiple support plates 1 are fixed with locking blocks 5 on one side near the crossbeam 2. The locking blocks 5 are movably locked to the crossbeam 2 and fixed with bolts and nuts. Specifically, the locking blocks 5 are T-shaped block structures, and T-shaped locking grooves are correspondingly opened on the crossbeam 2. The locking blocks 5 slide into the T-shaped locking grooves to achieve movable locking, and are then fixedly connected by bolts and nuts passing through the through holes on the locking blocks 5 and the crossbeam 2, so that multiple support plates 1 are connected into an integral support structure through the crossbeam 2. The T-shaped locking section can achieve pre-positioning in the horizontal direction and prevent the support plates 1 from detaching from the crossbeam 2 under lateral pressure. Furthermore, ear plates 6 are fixed to the side wall of the locking blocks 5, and locking grooves are opened at the top of the support frame 3. The ear plates 6 are movably locked in the locking grooves and fixed with bolts and nuts. The support frame 3 is a diagonal brace structure, and its bottom end is supported at the bottom of the pit, providing rear diagonal bracing force to the support plates 1, effectively offsetting the lateral pressure of the soil on the side wall of the pit, and preventing the support plates 1 from deforming and tilting. The movable locking structure between the ear plate 6 and the locking groove allows for flexible adjustment of the installation position and angle of the support frame 3 according to the depth of the foundation pit. The locking pre-positioning structure enables rapid assembly and alignment, significantly shortening the construction cycle compared to traditional welding or scattered bolt connections, and is also easy to disassemble, adjust, and reuse.

[0023] like Figures 4 to 6 As shown, guide sliders 405 are fixed at both the top and bottom of the mounting plate 402, and a groove 406 is provided at the corresponding position in the inner cavity of the water-absorbing shell 401. The guide sliders 405 are movably engaged in the grooves 406. Specifically, the cooperation between the guide sliders 405 and the grooves 406 ensures the stability and guiding accuracy of the mounting plate 402 when it moves in the horizontal direction, prevents the mounting plate 402 from deflecting or getting stuck during the movement, and enables the two mounting plates 402 to open or retract synchronously and smoothly.

[0024] Furthermore, the arc-shaped block 404 is a wedge-shaped block with a wedge angle of 15° to 45°. The two arc-shaped blocks 404 are symmetrically arranged with their wedge surfaces facing each other. In this embodiment, the wedge angle is preferably 30°. If the wedge angle is too small, the guiding force will be insufficient and the opening speed will be slow. If the wedge angle is too large, the risk of wedge surface self-locking will increase and the movement will be unstable. A wedge angle of 30° can achieve a better balance between guiding force and movement stability. The arc-shaped blocks 404 are made of wear-resistant engineering plastic or stainless steel. When the mounting plates 402 are pulled close together, the wedge surfaces of the two arc-shaped blocks 404 contact each other, decomposing the axial tension of the pull rod body 701 into a normal force perpendicular to the wedge surface, thereby forcing the two mounting plates 402 to open to both sides along the slide groove 406, realizing the transformation from linear movement to opposing opening movement.

[0025] like Figure 2As shown, a sealing ring is provided between the tie rod body 701 and the fixing seat 702. Specifically, the fixing seat 702 is a cylindrical structure, welded and fixed to the outer surface of the support plate 1. Its inner hole is clearance-fitted with the tie rod body 701, and the sealing ring is fitted into the annular groove between the outer wall of the tie rod body 701 and the inner wall of the fixing seat 702. In this embodiment, the sealing ring is an O-ring rubber sealing ring, which can effectively seal the fit gap between the tie rod body 701 and the fixing seat 702, preventing water seepage in the foundation pit from leaking to the outside of the support plate 1 through the gap, improving waterproof and moisture-proof performance, and extending the service life of the equipment. In other embodiments, the sealing ring can also be a Y-ring sealing ring to adapt to the sealing requirements under different water pressure conditions.

[0026] like Figures 2 to 4 As shown, the absorbent sponge pad 403 is fixed to the mounting plate 402 facing the pit, and the absorbent shell 401 has a detachable cover on the side facing away from the pit sidewall. Specifically, the absorbent sponge pad 403 is fixed to the mounting plate 402 by adhesive or snap-fit, facilitating disassembly and replacement. The absorbent sponge pad 403 is a high-molecular-weight absorbent resin composite sponge pad with a water absorption ratio of no less than 10 times its own weight, effectively absorbing groundwater and moisture seeping from the sidewall. The detachable cover is fixed to the absorbent shell 401 by bolts around its perimeter. After disassembly, the inner cavity of the absorbent shell 401 can be exposed. When the absorbent sponge pad 403 is retracted into the inner cavity of the absorbent shell 401, construction personnel can open the cover from the outside of the support plate 1 to remove the old pad and install the new pad, making the operation simple and quick. In other embodiments, the absorbent sponge pad 403 can also be a polyurethane foam sponge pad, which has good resilience and durability, suitable for construction scenarios that require frequent replacement of absorbent sponge pads.

[0027] Furthermore, the operating handle 703 is equipped with a locking mechanism. Specifically, the locking mechanism includes two locking holes on the outer end face of the fixed base 702 and an elastic locking pin on the operating handle 703. The two locking holes correspond to the extended and retracted positions of the absorbent sponge pad 403, respectively. When the operating handle 703 is pulled or pushed to its limit position, the elastic locking pin pops out under the action of the spring and inserts into the corresponding locking hole, maintaining the extended or retracted state of the absorbent sponge pad 403 and preventing the position of the absorbent sponge pad 403 from changing due to vibration or accidental contact during construction. When it is necessary to switch states, press the elastic locking pin to disengage it from the locking hole, and the operating handle 703 can be pushed or pulled again.

[0028] like Figure 1As shown, at least two sets of water-absorbing components 4 are spaced apart vertically on the support plate 1, and each set of water-absorbing components 4 is equipped with a set of tie rod components 7. Specifically, in this embodiment, multiple sets of water-absorbing components 4 are spaced apart vertically on the support plate 1. The operating handles 703 of the multiple sets of tie rod components 7 are located on the same side outside the support plate 1 and arranged vertically. Construction personnel can selectively pull the operating handles 703 at different heights according to the water seepage situation at different heights of the pit sidewall, so that the water-absorbing sponge pad 403 at that height extends and fits against the sidewall, achieving layered water absorption and coverage. When the water-absorbing sponge pad 403 at a certain height is saturated, the corresponding tie rod component 7 can be operated individually to retract and replace it. The water-absorbing components 4 at other heights remain in normal working condition, without affecting the overall moisture-proof effect, thus improving the flexibility and applicability of the equipment.

[0029] The construction method of the moisture-proof support equipment for foundation pit civil construction in this embodiment includes the following steps: S1. Cleaning and positioning of the foundation pit sidewalls: After the foundation pit is excavated to the design elevation, the loose soil and debris on the foundation pit sidewalls are cleaned, and the positioning and layout are carried out to determine the installation position and elevation of the support plate 1. S2. Support plate assembly: Multiple support plates 1 are slid into the T-shaped locking groove on the crossbeam 2 through the locking blocks 5 on their side walls to achieve pre-positioning and locking. Then, bolts and nuts are used to pass through the locking blocks 5 and the through holes on the crossbeam 2 to fix and connect the multiple support plates 1 to form an integral support structure through the crossbeam 2. S3. Support frame installation: Insert the ear plate 6 on the side wall of the locking block 5 into the locking groove at the top of the support frame 3 and fix it with bolts and nuts. The bottom of the support frame 3 is supported at the bottom of the pit and provides rear diagonal bracing for the support plate 1. S4. Water-absorbing sponge pad extends and fits: Pull the operating handle 703 on the outside of the support plate 1 to drive the tie rod body 701 to move outward along the fixed seat 702. The two mounting plates 402 are pulled through the hinge seat 704 and the connecting pile 407. With the wedge surface guide of the arc block 404, the two mounting plates 402 open synchronously along the slide groove 406, which drives the water-absorbing sponge pad 403 to extend out of the water-absorbing shell 401 and fit tightly against the side wall of the pit to continuously absorb water. After being pulled into place, the elastic locking pin is inserted into the locking hole of the corresponding extension position to lock it. S5. Retraction and Replacement of Absorbent Sponge Pad: When the absorbent sponge pad 403 is saturated with water, press the elastic locking pin and push the operating handle 703 to move the pull rod body 701 inward, so that the two mounting plates 402 and the absorbent sponge pad 403 are retracted into the inner cavity of the absorbent shell 401 at the same time. After retraction, insert the elastic locking pin into the locking hole of the corresponding retraction position to lock it. Open the detachable cover plate on the outside of the support plate 1, take out the saturated absorbent sponge pad 403, install a new absorbent sponge pad 403, and put the cover plate back to complete the replacement. When replacing, check the integrity of the sealing ring. If aging or damage is found, replace it as well. S6. Continuous moisture protection: Repeat steps S4 to S5, and replace the water-absorbing sponge pad 403 regularly according to the water absorption saturation to keep the construction environment of the foundation pit dry.

[0030] Furthermore, when multiple sets of water-absorbing components 4 are installed vertically on the support plate 1, in step S4, the construction personnel selectively pull the corresponding operating handle 703 according to the water seepage situation at different heights of the pit sidewall, so that the water-absorbing sponge pad 403 at that height extends and fits against the sidewall; in step S5, when the water-absorbing sponge pad 403 at a certain height is saturated, only the pull rod component 7 corresponding to that height is operated to retract and replace it, while the water-absorbing components 4 at other heights remain in normal working condition, without affecting the overall moisture-proof effect.

[0031] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A moisture-proof support device for foundation pit civil construction, comprising support plates, crossbeams, and support frames, characterized in that: It also includes a water-absorbing assembly and a tie rod assembly fixed to the side of the support plate near the pit; the water-absorbing assembly includes a water-absorbing shell, two mounting plates symmetrically arranged inside the water-absorbing shell, and a water-absorbing sponge pad fixed to the mounting plate. An arc-shaped block is fixed to the inner side of each mounting plate, and a connecting pile is provided at the rear end of each mounting plate; the tie rod assembly includes a tie rod body penetrating the support plate and the water-absorbing shell, a fixing seat fixed to the outer side of the support plate, an operating handle fixed to the outer end of the tie rod body, and a hinge seat at the inner end. The two ends of the hinge seat are movably connected to the two connecting piles; pulling the operating handle, guided by the hinge seat and the connecting pile in conjunction with the arc-shaped block, causes the two mounting plates to open synchronously, driving the water-absorbing sponge pad to extend and fit against the side wall of the pit.

2. The moisture-proof support equipment for foundation pit civil construction according to claim 1, characterized in that, Each of the support plates has a locking block fixed on one side near the crossbeam. The locking block is movably locked to the crossbeam and fixed by bolts and nuts. The side wall of the locking block is fixed with an ear plate. The top of the support frame has a locking groove. The ear plate is movably locked into the locking groove and fixed by bolts and nuts.

3. The moisture-proof support equipment for foundation pit civil construction according to claim 1, characterized in that, Guide sliders are fixed at the top and bottom of the mounting plate, and a groove is opened at the corresponding position in the inner cavity of the water-absorbing shell. The guide slider is movably engaged in the groove.

4. The moisture-proof support equipment for foundation pit civil construction according to claim 1, characterized in that, The arc-shaped block is a wedge-shaped block with a wedge angle of 15° to 45°. The two arc-shaped blocks are symmetrically arranged and their wedge surfaces face each other.

5. The moisture-proof support equipment for foundation pit civil construction according to claim 1, characterized in that, A sealing ring is provided between the pull rod body and the fixed base.

6. The moisture-proof support equipment for foundation pit civil construction according to claim 1, characterized in that, The absorbent sponge pad is a composite sponge pad made of superabsorbent polymer resin or a polyurethane foam sponge pad.

7. The moisture-proof support equipment for foundation pit civil construction according to claim 1, characterized in that, The operating handle is provided with a locking mechanism, which includes a locking hole on the outer end face of the fixed base and an elastic locking pin on the operating handle.

8. The moisture-proof support equipment for foundation pit civil construction according to claim 1, characterized in that, The support plate is provided with at least two sets of water-absorbing components at intervals along the vertical direction, and each set of water-absorbing components is provided with a set of tie rod components.

9. A construction method for a moisture-proof support device for foundation pit civil construction as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. After cleaning and positioning the pit sidewalls, multiple support plates are sequentially fixed to the crossbeam movable clamps using locking blocks and bolts and nuts. S2. Insert the ear plate into the engagement groove at the top of the support frame and secure it with bolts and nuts; S3. Pull the operating handle on the outside of the support plate to drive the tie rod body to pull the two mounting plates through the hinge seat and connecting pile. With the help of the arc block guide, the two mounting plates open synchronously along the slide groove, which drives the water-absorbing sponge pad to extend out of the water-absorbing shell and tightly adhere to the side wall of the pit to continuously absorb water. S4. When the absorbent sponge pad is saturated with water, push the operating handle to retract the two mounting plates and the absorbent sponge pad into the inner cavity of the absorbent shell simultaneously. Open the detachable cover on the outside of the support plate to complete the replacement.

10. The construction method of the moisture-proof support equipment for foundation pit civil construction according to claim 9, characterized in that, In step S3, after pulling the operating handle to the position, insert the elastic locking pin into the locking hole at the corresponding extended position on the fixed base to lock it; in step S4, after pushing the operating handle back to the position, insert the elastic locking pin into the locking hole at the corresponding retracted position to lock it. When replacing the absorbent sponge pad, check the integrity of the sealing ring.

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