Waterproof grouting device for pre-embedded part joint of folded plate stair

Abstract

This invention discloses a waterproof grouting device for embedded joints in folded-plate staircases, comprising a protective shell, a grouting component at the top front side of the protective shell, a sealing component at the bottom of the protective shell, a shear-resistant component inside the protective shell, an venting component at the left end of the top surface of the protective shell, and an indicator component at the right end of the top surface of the protective shell. In use, the shear-resistant component squeezes out air bubbles in the grout, preventing the protective shell from bulging and deforming. The venting component ensures air is released without grout leakage. After grouting and curing, the grout-holding groove firmly anchors the subsequent leveling cement. The entire device transforms into a composite shock-absorbing building component with high shear resistance and anti-detachment properties. When the grouting pipe is pulled out, the grouting component prevents splashing pollution during pipe removal, ensuring cleanliness of the construction site and stable joint pressure. The indicator component provides construction personnel with intuitive and clear visual feedback on the pressure and full grout level.

Description

Technical Field

[0001] This invention relates to the field of building equipment technology, specifically to a waterproof grouting device for embedded joints of folded plate staircases. Background Technology

[0002] In the construction of modern prefabricated buildings (PC buildings), the connection between the folded plate prefabricated staircase and the main structure is usually achieved by welding or bolting embedded parts, and then the joint gaps must be filled with high-strength grout.

[0003] During traditional joint grouting construction, it is impossible to observe the internal flow. The grout material is prone to generating eddies and entraining air in the narrow space, causing hollowing of the core stress joints, which seriously affects the structural safety. The traditional method of using a hose to vent air results in serious grout overflow. After grouting is completed, the moment the grouting pipe is pulled out, due to the high pressure inside the cavity, the viscous slurry is very easy to spray outward and flow back, which not only contaminates the staircase surface, but also causes internal depressurization. Summary of the Invention

[0004] The purpose of this invention is to provide a waterproof grouting device for embedded joints of folded plate staircases, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The protective shell is installed outside the staircase embedded node to form a flat grouting cavity. A grouting assembly is provided at the top front side of the protective shell for connecting the grouting pipe and preventing grout backflow after pipe removal. The grouting assembly includes a grouting port, a duckbill valve, and a dust cover. A sealing assembly is provided at the bottom of the protective shell, filling the microscopic unevenness of the concrete surface. The sealing assembly includes a fitting flange, an annular groove, and a water-stop sealing strip. A shear-resistant assembly is provided inside the protective shell. The air bubbles in the slurry are squeezed out and the protective shell is prevented from bulging and deforming under high pressure grouting. The shear-resistant component includes a flow guide baffle, a support rod, and damping shear teeth. An exhaust component is provided at the left end of the top surface of the protective shell. The exhaust component first discharges the air bubbles in the slurry and then seals the exhaust hole. The exhaust component includes an exhaust groove, a easily broken blind pipe, and a micro-slit exhaust port. An indicator component is provided at the right end of the top surface of the protective shell. The indicator component converts the fluid pressure inside the protective shell into an intuitive visual acceptance signal. The indicator component includes an observation base, a high-elasticity indicator membrane, a pressure ring, and a protective cover.

[0006] Preferably, the grouting port is located at the top of the front side of the protective shell, the duckbill valve is snapped into the inside of the grouting port, and the dust cover is threaded onto the outside of the grouting port.

[0007] Preferably, the fitting flange is disposed on the bottom surface of the protective shell, the annular groove is formed on the bottom surface of the fitting flange, and the water-stop sealing strip is fixedly connected to the inner side of the annular groove.

[0008] Preferably, multiple flow guide baffles and support rods are arranged in an array and staggered on the inner wall of the protective shell, and multiple damping shear teeth are symmetrically distributed on the side of each flow guide baffle, and the damping shear teeth are sawtooth-shaped.

[0009] Preferably, the exhaust groove is located at the left end of the top surface of the protective shell, the easily broken blind pipe is located on the top surface of the exhaust groove, the bottom of the easily broken blind pipe is provided with a V-shaped break groove, and the micro-slit exhaust port is located on the top surface of the easily broken blind pipe.

[0010] Preferably, the observation base is located at the right end of the top surface of the protective shell, the surface of the observation base has multiple interconnected micro-holes, the high-elasticity indicator film is located on the inner surface of the observation base, the pressure ring is fixedly connected to the inner surface of the observation base, and the pressure ring is located above the high-elasticity indicator film.

[0011] Preferably, the top surface of the protective shell is provided with multiple slurry-grabbing grooves, and the cross-section is a dovetail shape that is narrower at the top and wider at the bottom.

[0012] Preferably, the edge of the fitting flange is provided with multiple countersunk holes.

[0013] The method for using a waterproof grouting device for embedded joints in folded plate staircases includes the following steps:

[0014] S1. Construction Preparation Stage: Remove loose dust and gravel from the concrete surface of the embedded parts and surrounding concrete of the folded plate staircase, keeping the base surface relatively flat. Place the protective shell over the joints of the embedded parts, and use high-strength expansion bolts or self-tapping anchors to pass through the countersunk holes that fit the flange edge, drive them into the concrete, and tighten them one by one. During the tightening process, the bolt heads are completely sunk into the chamfered holes. At the same time, the bottom water-stop sealing strip is strongly squeezed to fill the micro-pitted surface of the concrete, forming the initial sealed cavity.

[0015] S2, Dynamic Grouting Stage: Manually unscrew the dust cover on the outside of the grouting port, and forcefully push the grouting hose connected to the grouting pump directly into the grouting port. The hose opening opens the one-line cut of the silicone duckbill valve. Turn on the high-pressure grouting pump, and the high-strength, viscous slurry is pumped into the internal cavity. After the slurry flows in, it is blocked and divided by the staggered array of guide baffles with a slight upward angle of 5°-15°, presenting a gentle "bow-shaped" laminar flow that rises from bottom to top. During this process, the air bubbles inside are completely squeezed out of the dead corners by buoyancy and the slight upward angle sliding effect, and converge upwards; the support rod simultaneously resists the huge fluid tension to prevent the outer shell from bursting and deforming.

[0016] S3, Exhaust and sealing stage: The pure air squeezed to the top is discharged into the atmosphere through the micro-slit exhaust port at the top of the easily broken blind pipe. When the internal slurry is completely filled and touches the exhaust port, because the gap of the micro-slit exhaust port is only 0.3-0.5mm, the quartz sand particles in the slurry instantly generate a "particle arching effect" at the gap, causing physical jamming. The slurry quickly dehydrates and thickens, automatically sealing the exhaust port completely within 1 second to prevent the slurry from overflowing.

[0017] S4. Visual Verification Stage: After the vent is locked, the grouting pump continues to run (or maintains pressure), causing the fluid pressure inside the cavity to rise. The hydraulic pressure pushes the high-elasticity indicator membrane vertically upward through the connecting micro-holes on the observation base. The high-elasticity indicator membrane overcomes its elastic modulus and bulges outward into a hemispherical convex surface. When the on-site supervisor visually observes that the bulging height of the membrane reaches the set threshold, it can be physically confirmed that every microscopic dead corner inside the node has been filled by the high-pressure limit. At this time, the construction worker issues a pump stop command, completing the quality acceptance.

[0018] S5. Locking Stage: The worker directly pulls the grouting hose out of the grouting port. Without hose support, the silicone duckbill valve, under the combined pressure of its own strong silicone rebound and the high-pressure backflow of the grout within the cavity, instantly locks shut. This process completely blocks the path of the high-pressure grout jetting back outwards, maintaining the high-pressure state within the cavity and ensuring the cleanliness of the construction site. Subsequently, the device enters a 12-24 hour static hydration and solidification period.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. In use, the slightly upward angle of the flow-guiding baffles distributed in the shear-resistant component array transforms the high-pressure direct-injection slurry into a gentle "bow-shaped" laminar flow. The buoyancy difference forces the entrained air bubbles to slide upwards and be squeezed out. The through-through support rod and the flow-guiding baffles work together to prevent the protective shell from bulging and deforming under high pressure, greatly improving the grouting fullness of the core stress nodes. The exhaust component utilizes the "particle arching effect" of the fine aggregate in the high-strength grout, allowing air to escape freely. The slurry is trapped by its own aggregate when it touches the micro-cracks, achieving air release without slurry leakage. The V-shaped fracture groove is hidden inside the recessed venting groove. After solidification, the blind pipe is broken, and the rough fracture surface is completely lower than the top surface of the protective shell. After grouting and curing, the damping shear teeth and support rods are deeply embedded in the high-strength concrete, forming a strong mechanical three-dimensional interlock with the slurry. The slurry-grabbing groove on the top surface of the protective shell firmly anchors the subsequent leveling cement. The entire device is transformed into a composite vibration-damping building component with high shear resistance and anti-fall-off properties.

[0021] 2. When using this invention, the silicone duckbill valve closes and locks instantly under the dual action of its own elasticity and the high pressure of the internal mud when the grouting pipe is pulled out, which prevents the pollution caused by the splashing when the pipe is pulled out, and ensures the cleanliness of the construction site and the stability of the node pressure. The indicator component uses the pure mechanical thin film mechanics principle. The high elastic indicator film is bulged by hydraulic lifting, which provides construction personnel with intuitive and clear visual feedback of constant pressure and full grouting, and there is no need to disassemble it afterward. Attached Figure Description

[0022] Figure 1 This is a first-view structural diagram of the present invention;

[0023] Figure 2 This is a schematic diagram of the second perspective structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the grouting assembly structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the exhaust assembly structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the indicator component structure of the present invention.

[0027] In the diagram: 1. Protective outer shell; 2. Grouting assembly; 21. Grouting port; 22. Duckbill valve; 23. Dust cover; 3. Sealing assembly; 31. Fitting flange; 32. Annular groove; 33. Water-stop sealing strip; 4. Shear-resistant assembly; 41. Flow guide baffle; 42. Support rod; 43. Damping shear teeth; 5. Exhaust assembly; 51. Exhaust groove; 52. Easily broken blind pipe; 53. Micro-slit exhaust port; 6. Indicator assembly; 61. Observation base; 62. High-elasticity indicator membrane; 63. Pressure ring; 64. Protective cover; 7. Grouting groove; 8. Countersunk hole. Detailed Implementation

[0028] 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.

[0029] Please see Figure 1-5This invention provides a technical solution: a waterproof grouting device for embedded parts of a folded-plate staircase, comprising a protective shell 1. The protective shell 1 is integrally injection molded from high-strength modified engineering plastic (preferably PC / ABS alloy plastic with 20% added glass fiber). This material not only has extremely high tensile strength to withstand the high pressure of internal grouting, but also has a linear expansion coefficient similar to concrete, avoiding peeling under long-term environmental temperature differences. The thickness is flattened, and the maximum protruding thickness is strictly controlled between 25mm and 30mm. After being installed outside the embedded part, its highest elevation is lower than the subsequent building surface layer. The grouting component 2 is installed on the top of the front side of the protective shell 1. Grouting component 2 prevents high-pressure backflow during pipe removal. Grouting component 2 includes grouting port 21, duckbill valve 22, and dust cover 23. Sealing component 3 is installed at the bottom of protective shell 1. Sealing component 3 includes fitting flange 31, annular groove 32, and water-stop sealing strip 33. Shear component 4 is installed inside protective shell 1. Shear component 4 includes flow guide baffle 41, support rod 42, and damping shear teeth 43. Exhaust component 5 is installed at the left end of the top surface of protective shell 1. Exhaust component 5 includes exhaust groove 51, easily broken blind pipe 52, and micro-slit exhaust port 53. Indicator component 6 is installed at the right end of the top surface of protective shell 1. Indicator component 6 includes observation base 61, high-elasticity indicator membrane 62, and pressure ring 63.

[0030] The grouting port 21 is integrally formed on the top of the front side of the protective shell 1. The duckbill valve 22 is snapped into the inside of the grouting port 21. The duckbill valve 22 is made of high-elastic industrial silicone material. Its opening end has a straight elastic cut. The lips on both sides of the cut have a pre-tightening force in the factory state. The cut direction faces the inside of the shell to achieve one-way conduction. The dust cover 23 is threaded to the outside of the grouting port 21. It is used to prevent mud, sand, dust and other debris from the construction site from entering the valve body during factory transportation and on-site stacking, which may cause the valve lip seal to fail.

[0031] The fitting flange 31 is integrally formed on the bottom surface of the protective shell 1, extending vertically outward around the outer edge of the open end of the protective shell 1 to fit against the concrete surface. The annular groove 32 is formed on the bottom surface of the fitting flange 31, and the water-stop sealing strip 33 is bonded to the inner side of the annular groove 32. The water-stop sealing strip 33 is made of slow-expanding water-swelling rubber material (such as special rubber containing hydrophilic polyurethane groups). During the short period of grouting construction (1-2 hours), even if it comes into contact with water in the cement slurry, it will not expand drastically immediately, thus ensuring dimensional stability during the construction period. In the long building life cycle, once external rainwater or washing water seeps in through the tiny cracks, the sealing strip will absorb free water and expand in volume, blocking the seepage channel with huge expansion pressure, providing a long-lasting anti-corrosion and waterproof barrier.

[0032] Multiple flow guide baffles 41 and support rods 42 are arranged in an array and staggered, integrally formed on the inner wall of the protective shell 1. The flow guide baffles 41 are horizontally inclined at 5°-15°. This slight slope can utilize the principle of buoyancy to forcefully guide the tiny air bubbles encased in the grout to slide upwards along the slope, greatly avoiding the formation of air bubbles trapped below the baffles and forming voids. The support rods 42 penetrate the cavity horizontally. During high-pressure grouting, the support rods 42 convert the deformation stress of the protective shell 1 expanding outwards into their own axial tensile force, effectively preventing the protective shell 1 from bulging or bursting. Multiple damping shear teeth 43 are symmetrically distributed and integrally formed on the side of each flow guide baffle 41. The damping shear teeth 43 are serrated. These serrated structures are deeply embedded in the high-strength concrete like pins, forming a strong physical and mechanical interlock with the cured concrete.

[0033] The venting groove 51 is a recessed small bowl-shaped structure integrally injection molded on the top surface of the protective shell 1. Its edge is rounded to disperse stress. The easily broken blind tube 52 is integrally molded on the surface of the venting groove 51. A V-shaped breakage groove is opened at the bottom of the easily broken blind tube 52, and the absolute elevation of the V-shaped breakage groove is lower than the highest top surface of the protective shell 1. The micro-slit venting port 53 is opened on the top surface of the easily broken blind tube 52. Its gap width is controlled between 0.3mm and 0.5mm, which is smaller than the average particle size of fine aggregate in the high-strength grout.

[0034] The observation base 61 is integrally formed on the top surface of the protective shell 1, forming a shallow circular groove. Multiple interconnected micropores are opened on the inner surface of the observation base 61. The high-elasticity indicator film 62 is horizontally laid on the inner surface of the observation base 61. The high-elasticity indicator film 62 is made of a high-ductility silicone film. The pressure ring 63 is welded to the inner surface of the observation base 61 by an ultrasonic instantaneous high-temperature welding process. The pressure ring 63 is located above the high-elasticity indicator film 62, which tightly presses and seals the edge of the high-elasticity indicator film 62 to the inner surface of the observation base 61, ensuring that this area can withstand local fluid pressure exceeding 0.5MPa without the film falling off or leaking.

[0035] The top surface of the protective shell 1 has multiple grout-grabbing grooves 7 with a dovetail-shaped cross-section that is narrower at the top and wider at the bottom. These grooves are used for subsequent grouting and tile application. After the cement mortar applied later hardens, it is mechanically "locked" in the grooves, providing extremely strong pull-out resistance.

[0036] Multiple countersunk holes 8 are provided along the edge of the flange 31.

[0037] Working principle: When using this invention, the on-site construction personnel first clean the floating dust on the embedded parts and the surrounding concrete surface. Then, the protective shell 1 is placed on the joint of the stair node and the embedded parts. High-strength countersunk bolts are driven into the concrete and pass through the countersunk holes 8. As the bolts are gradually tightened, the water-stop sealing strip 33 at the bottom of the flange 31 is strongly squeezed and deformed, filling the micro-irritation surface of the concrete and forming an initial sealed cavity. The overall device is extremely low in height, completing the structural preparation before high-pressure grouting.

[0038] Manually unscrew the dust cover 23 and forcefully push the grouting hose connected to the grouting pump directly into the grouting port 21. As the grouting pump starts, the high-pressure slurry flowing out of the pipe head pushes open the one-line elastic cut of the duckbill valve 22 and injects into the cavity. The high-strength and extremely viscous grout entering the cavity cannot form a chaotic jet due to the strong physical obstruction of the internal array of staggered flow guide baffles 41. Instead, it is forced to transform into a gentle "bow"-shaped (or S-shaped) laminar flow network. The slurry rises steadily from bottom to top like a rising tide. During the rise, the air trapped inside the slurry encounters the 5°-15° inclined flow guide baffles 41 and, due to buoyancy, slides and converges rapidly along the slope. Finally, it is all squeezed to the exhaust component at the top of the protective shell 1, completely eliminating the risk of hollowing at the core stress node. At the same time, the support rod 42 that runs through the interior withstands the huge fluid thrust, ensuring the dimensional stability of the thin-walled shell.

[0039] The compressed air passes through the micro-slit vent 53 at the top of the easily broken blind tube 52 and is discharged into the atmosphere. When the internal slurry is completely filled and touches the micro-slit vent 53, the hydrodynamic morphology changes abruptly. Since the gap of the micro-slit vent 53 is only 0.3-0.5mm, when hard micro-aggregates such as quartz sand in the slurry try to pass through the gap, they will be squeezed and stuck at the tiny opening, producing a significant "particle arching effect". After the aggregate is stuck, the cementitious material in the slurry quickly undergoes shear thickening and dehydration at this point. Under the action of the slurry's own extremely high surface tension, it automatically and physically seals the originally breathable micro-slit within a short second, ensuring that no mud overflows from the outside.

[0040] After the micro-slit vent 53 is locked, the cavity becomes a sealed space. The small flow rate continuously output by the grouting pump will cause the pressure inside the cavity to increase dramatically. This hydraulic pressure is applied vertically upward through the connecting micro-holes on the observation base 61 and is evenly applied to the bottom surface of the high-elasticity indicator membrane 62. The center of the high-elasticity indicator membrane 62 is compressed and overcomes its own elastic modulus, so it begins to bulge upward. When the on-site construction worker or supervisor observes with the naked eye that the height of the bulging surface of the membrane reaches or slightly exceeds the threshold surface set by the pressure ring 63, the high pressure density required by the design is achieved. Then the construction worker can issue a stop command, realizing the visualization and standardized acceptance of grouting quality.

[0041] The moment the pump is stopped and the grouting hose is pulled out, the duckbill valve 22, under the dual pressure of the elastic recovery force of the silicone material itself and the huge hydraulic pressure pushed outward by the high-pressure mud inside, instantly locks closed the straight cut of the duckbill valve 22. The closing force is much greater than the internal grout pressure, completely cutting off the path of the mud to be sprayed outward and flowing back, maintaining the pressure state inside the cavity. After the grouting material in the node has been allowed to stand and undergo hydration reaction and initial setting (about 12-24 hours), the construction worker gently taps the top of the easily broken blind pipe 52 with a hammer from the side. Due to the stress concentration effect, the blind pipe will break cleanly and brittlely along the weakest V-shaped fracture groove. The fracture surface is completely located at the bottom of the small bowl of the concave venting groove 51, and the highest point of its rough cross-section is still perfectly hidden under the overall top surface of the protective shell 1.

[0042] The entire device has completed the grouting auxiliary function, and its outer shell no longer needs to be destructively dismantled. Subsequent masonry workers can directly apply leveling cement to the surface of the outer shell. The dovetail-shaped grouting groove 7 firmly anchors the cement mortar, and then the conventional laying of floor tiles or stone is carried out. The entire device is transformed into an internal building component with damping, shear resistance, energy dissipation, self-expansion, corrosion resistance and waterproofing when exposed to water.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waterproof grouting device for embedded joints of folded plate staircases, comprising a protective outer shell (1), characterized in that: The protective shell (1) is installed outside the staircase embedded node to form a flat grouting cavity. A grouting assembly (2) is provided at the top of the front side of the protective shell (1) to connect the grouting pipe and prevent grout backflow after the pipe is pulled out. The grouting assembly (2) includes a grouting port (21), a duckbill valve (22), and a dust cover (23). A sealing assembly (3) is provided at the bottom of the protective shell (1). The sealing assembly (3) fills the micro-irritation surface of the concrete. The sealing assembly (3) includes a fitting flange (31), an annular groove (32), and a water-stop sealing strip (33). A shear-resistant assembly (4) is provided inside the protective shell (1). The shear-resistant assembly (4) squeezes out air bubbles in the grout and prevents the protective shell (1) from leaking out. Under high pressure grouting, the bulge deformation is unstable. The shear-resistant component (4) includes a flow guide baffle (41), a support rod (42), and a damping shear tooth (43). The top left end of the protective shell (1) is provided with an exhaust component (5). The exhaust component (5) first discharges the air bubbles in the slurry and then seals the exhaust hole. The exhaust component (5) includes an exhaust groove (51), a easily broken blind pipe (52), and a micro-slit exhaust port (53). The top right end of the protective shell (1) is provided with an indicator component (6). The indicator component (6) converts the fluid pressure inside the protective shell (1) into an intuitive visual acceptance signal. The indicator component (6) includes an observation base (61), a high-elasticity indicator membrane (62), a pressure ring (63), and a protective cover (64).

2. The waterproof grouting device for embedded parts of a folded plate staircase according to claim 1, characterized in that: The grouting port (21) is located at the top of the front side of the protective shell (1), the duckbill valve (22) is snapped into the inside of the grouting port (21), and the dust cover (23) is threaded onto the outside of the grouting port (21).

3. The waterproof grouting device for embedded parts of a folded plate staircase according to claim 1, characterized in that: The fitting flange (31) is set on the bottom surface of the protective shell (1), the annular groove (32) is opened on the bottom surface of the fitting flange (31), and the water-stop sealing strip (33) is fixedly connected to the inside of the annular groove (32).

4. The waterproof grouting device for embedded parts of folded plate staircases according to claim 1, characterized in that: Multiple flow guide baffles (41) and support rods (42) are arranged in an array and staggered on the inner wall of the protective shell (1). Multiple damping anti-shear teeth (43) are symmetrically distributed on the side of each flow guide baffle (41). The damping anti-shear teeth (43) are serrated.

5. The waterproof grouting device for embedded joints of folded plate staircases according to claim 1, characterized in that: The exhaust groove (51) is located on the left end of the top surface of the protective shell (1), the easily broken blind tube (52) is located on the top surface of the exhaust groove (51), the bottom of the easily broken blind tube (52) is provided with a V-shaped break groove, and the micro-slit exhaust port (53) is located on the top surface of the easily broken blind tube (52).

6. The waterproof grouting device for embedded joints of folded plate staircases according to claim 1, characterized in that: The observation base (61) is located on the right side of the top surface of the protective shell (1). The surface of the observation base (61) has multiple interconnected micro-holes. The high-elasticity indicator film (62) is located on the inner surface of the observation base (61). The pressure ring (63) is fixedly connected to the inner surface of the observation base (61). The pressure ring (63) is located above the high-elasticity indicator film (62).

7. The waterproof grouting device for embedded parts of a folded plate staircase according to claim 1, characterized in that: The protective shell (1) has multiple slurry-grabbing grooves (7) on its top surface, and the cross-section is a dovetail shape that is narrow at the top and wide at the bottom.

8. The waterproof grouting device for embedded parts of a folded plate staircase according to claim 1, characterized in that: The edge of the fitting flange (31) is provided with multiple countersunk holes (8).

9. A method of using a waterproof grouting device for embedded joints of folded plate staircases according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Construction preparation stage: Remove the floating dust and gravel from the nodes of the embedded parts of the folded plate staircase and the surrounding concrete surface, keep the base surface relatively flat, cover the protective shell (1) on the joint of the embedded parts, and use high-strength expansion bolts or self-tapping anchors to pass through the countersunk holes (8) of the flange (31) and drive them into the concrete and tighten them one by one. During the tightening process, the bolt head is completely sunk into the chamfered hole; at the same time, the bottom water-stop sealing strip (33) is strongly squeezed to fill the micro-pockmark on the concrete surface and form the initial sealed cavity. S2, Dynamic grouting stage: Manually unscrew the dust cover (23) on the outside of the grouting port (21), and forcefully push the grouting hose connected to the grouting pump directly into the grouting port (21). The hose opens the one-line cut of the silicone duckbill valve (22), and the high-pressure grouting pump is turned on. The high-strength and viscous mud is pumped into the internal cavity. After the mud rushes in, it is blocked and divided by the staggered array of guide baffles (41) with a 5°-15° slight upward angle, presenting a gentle "bow-shaped" laminar flow that rises from bottom to top. During this process, the air bubbles inside are completely squeezed out of the dead corner by buoyancy and the slight upward angle sliding effect, and converge upward. The support rod (42) resists the huge fluid tension at the same time to prevent the outer shell from bursting and deforming. S3, Exhaust and sealing stage: The pure air squeezed to the top is discharged into the atmosphere through the micro-slit exhaust port (53) at the top of the easily broken blind pipe (52). When the internal slurry is completely filled and touches the exhaust port, since the gap of the micro-slit exhaust port (53) is only 0.3-0.5mm, the quartz sand particles in the slurry will instantly generate a "particle arching effect" at the gap and physically get stuck. The slurry will quickly dehydrate and thicken, and automatically seal the exhaust port completely within 1 second to prevent the slurry from overflowing. S4. Visual Verification Stage: After the vent is locked, the grouting pump continues to run (or maintains pressure), causing the fluid pressure inside the cavity to rise. The hydraulic pressure pushes the high-elasticity indicator membrane (62) vertically upward through the connecting micro-holes on the observation base (61). The high-elasticity indicator membrane (62) overcomes the elastic modulus and bulges outward into a hemispherical convex surface. When the on-site supervisor observes with the naked eye that the bulging height of the membrane reaches the set threshold, it can be physically confirmed that every microscopic dead corner inside the node has been filled by the high pressure limit. At this time, the construction worker issues a pump stop instruction to complete the quality acceptance. S5, Locking Stage: The worker directly pulls the grouting hose out of the grouting port (21). The silicone duckbill valve (22) loses the support of the hose. Under the dual pressure of its own strong silicone rebound and the high pressure of the slurry in the cavity, the cut is instantly locked and closed. This process completely blocks the path of the high pressure slurry to be sprayed outward and flows back, maintaining the high pressure state in the cavity and ensuring the cleanliness of the construction site. Subsequently, the device enters a 12-24 hour static hydration and solidification period.

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