A precast laminated slab joint leakage prevention grouting device

Abstract

This utility model provides a grout leakage prevention device for precast composite slab joints, belonging to the technical field of grout leakage prevention devices. The device includes: multiple sealing baffles arranged sequentially along the joint extension direction, each sealing baffle having a stretchable plate body in the joint width direction; elastic connectors disposed between adjacent sealing baffles, elastically connecting adjacent plates so that each plate body automatically adjusts its total length by relative sliding under the influence of changes in joint width; grooves formed on both sides of each sealing baffle facing the edge of the precast composite slab, extending continuously along the plate length direction; and a fixed frame spanning both sides of the joint, detachably fixed to the precast composite slab, pressing the multiple sealing baffles above the joint, ensuring the grooves remain continuously in contact with the edge of the composite slab, thus forming a second seal and solving the problem of grout leakage at precast composite slab joints.

Description

Technical Field

[0001] This utility model belongs to the technical field of grout leakage prevention devices, specifically, it relates to a grout leakage prevention device for prefabricated composite slab joints. Background Technology

[0002] Precast composite slabs are composite floor systems formed by molding the base slab and reinforcing steel in a factory in one go, then hoisting them on site and finally casting the composite layer. Their advantages lie in moving a large amount of wet work to the workshop, improving quality, shortening the construction period, and reducing formwork consumption, making them a core component of prefabricated concrete systems. However, the rough edges reserved around the perimeter of the composite slab inevitably form continuous longitudinal joints after on-site assembly. When the cast-in-place concrete layer is poured, the grout, under the impact of the vibrator and its own weight, easily seeps down along these joints, contaminating the slab bottom, clogging electromechanical pipelines, and soiling the decorative surfaces. The subsequent cleaning costs far exceed the initial preventative investment.

[0003] To seal the joint, traditional methods have long been used on construction sites, such as manually inserting sponge strips, applying fiber tape, applying polyurethane adhesive, or nailing wooden strips. Sponge strips lack sufficient resilience; when there are errors in board thickness or changes in joint width, gaps remain in excessively wide areas, while in excessively narrow areas, excessive compression leads to loss of elasticity, causing them to detach under increased concrete lateral pressure. Fiber tape relies on manual compaction, requiring a high working height and poor visibility from the bottom of the board, resulting in widespread air bubbles and wrinkles. The adhesive layer is easily punctured during vibration, causing point-like grout leakage. Polyurethane adhesive has a long curing time, requiring surface drying before pouring, severely delaying the pouring process. Furthermore, the cured adhesive bonds to the concrete, tearing and damaging it during demolding, making it unrecyclable and resulting in significant material waste. Wooden strips require on-site nailing, which damages the edges of the composite board, leaving residual holes after removal, affecting subsequent finishing. The wood also warps and deforms after absorbing water, resulting in low reusability. Utility Model Content

[0004] In view of this, the present invention provides a grout leakage prevention device for precast composite slab joints, which solves the problem of grout leakage prevention at precast composite slab joints.

[0005] This utility model is implemented as follows:

[0006] This utility model provides a grout leakage prevention device for precast composite slab joints, comprising:

[0007] Multiple sealing baffles are arranged sequentially along the joint extension direction, and each sealing baffle has a plate body that can be stretched in the joint width direction;

[0008] The elastic connector is located between two adjacent sealing baffles to elastically connect the adjacent plates, so that the plates can slide relative to each other when subjected to changes in the width of the joint and automatically adjust the total length.

[0009] The groove is formed on both sides of each sealing baffle facing the edge of the prefabricated composite plate and extends continuously along the length of the plate to receive and fit the edge of the composite plate to form the first seal.

[0010] A fixed frame is installed across both sides of the joint and is detachably fixed to the prefabricated composite slab. It presses the multiple sealing baffles above the joint, so that the groove portion and the edge of the composite slab remain in continuous contact, thereby forming a second seal.

[0011] The technical effects of the precast composite slab joint anti-leakage device provided by this utility model are as follows: Through the stepless telescopic structure of the sealing baffle, elastic connector and fixed frame, the device can automatically extend or shorten when the joint width changes on site. The groove and the edge of the composite slab are always in contact to form a double seal. There is no need for on-site cutting or padding. One-time installation can continuously prevent grout leakage and significantly reduce the amount of manual adjustment work.

[0012] Based on the above technical solution, the precast composite slab joint anti-leakage device of this utility model can be further improved as follows:

[0013] The sealing baffle is composed of an elastic metal sheet and a flexible sealing layer. The flexible sealing layer covers the lower surface of the elastic metal sheet facing the joint and maintains continuous contact with the joint surface during expansion and contraction.

[0014] The elastic metal sheet is made of stainless steel spring steel strip, which is thick enough to provide longitudinal rebound force; the flexible sealing layer is a closed-cell foamed EPDM rubber sheet, which is pasted on the lower surface of the metal sheet to form a composite board that is both corrosion resistant and flexible.

[0015] Furthermore, the elastic connector is a wave spring sheet, with both ends of the wave spring sheet being embedded in the end slots of the adjacent sealing baffles, so that the adjacent plates are always subjected to a rebound force toward the center of the joint during the expansion and contraction process.

[0016] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: after the wave spring sheet is embedded in the slot, it forms a hidden internal pull structure. Regardless of whether the adjacent plates are affected by thermal expansion and contraction or concrete lateral pressure, they can automatically reset under the action of spring rebound, eliminate the difference in the joint step, keep the top surface of the joint smooth, and prevent grout retention and subsequent water seepage.

[0017] Furthermore, the groove portion has an n-shaped cross-section, and its opening width gradually decreases from the bottom of the groove to the opening, which is used to form a wedge-tightening effect after the laminated plate is inserted at the edge.

[0018] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the tapered n-shaped groove generates a wedge-tightening effect when inserted into the edge of the composite plate, and the more pressure it is applied, the tighter it becomes. After installation, mechanical self-locking can be achieved without additional adhesive strips. When disassembling, it can be easily removed by gently pushing in the opposite direction, thus meeting the dual requirements of quick assembly and disassembly and continuous sealing.

[0019] Furthermore, the fixing frame includes a crossbeam spanning the seam and clamping arms extending downward from both ends of the crossbeam. The inner side of the clamping arms is provided with barbed protrusions for engaging the sides of the prefabricated composite slab to prevent the frame from floating.

[0020] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the crossbeam, together with the barbed clamping arm, forms a "top-pressing and bottom-hooking" quick clamp, which can be locked with one hand. The barbs prevent the frame from floating during concrete vibration, ensuring that the relative position of the sealing baffle and the joint remains unchanged, and avoiding sealing failure.

[0021] Furthermore, the crossbeam is provided with a downward-protruding arc-shaped pressure strip in the middle. The lower surface of the arc-shaped pressure strip forms a line contact with the top surface of the uppermost sealing baffle, so that the holding force is evenly distributed along the width of the joint.

[0022] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the arc-shaped pressure strip transmits the locking force evenly to the top baffle in a line contact manner, avoiding local overpressure that could cause the plate to warp, so that the elastic expansion and contraction function is not restricted, while reducing the amount of frame material used, achieving both lightweight and pressure equalization.

[0023] Furthermore, the sealing baffle is provided with downwardly bent wing plates at both ends. The height of the wing plates in the joint width direction is greater than the depth of the groove, which is used to enhance the lateral clamping force on the edge of the composite plate when the slurry pressure increases.

[0024] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: under the action of the rising pressure of the grout, the flange flips to the side of the composite plate, forming a "self-reinforcing" side seal that becomes tighter under pressure. The greater the pressure, the tighter the seal, which can dynamically offset the lateral expansion of the concrete and prevent the grout from overflowing.

[0025] Furthermore, the elastic connector forms a hidden inner cavity between adjacent sealing baffles, and a water-absorbing expansion strip is pre-placed in the inner cavity. After contacting the slurry moisture, the water-absorbing expansion strip expands along the arrangement direction of the plate to compensate for the gaps caused by the rebound of the plate.

[0026] The pre-installed water-absorbing and expanding strip in the concealed inner cavity is extruded from modified bentonite particles and styrene-butadiene rubber. It has a rectangular cross-section and is covered with a water-permeable non-woven fabric to prevent particle loss. When it comes into contact with water, the bentonite can expand to several times its original volume instantly, thereby generating a continuous lateral thrust on the adjacent sealing baffle and further eliminating any possible micro-gaps.

[0027] Furthermore, a slidable pressure plate is provided between the fixed frame and the sealing baffle. The lower surface of the pressure plate is provided with transverse teeth that mesh with the top surface of the sealing baffle, which is used to prevent the sealing baffle from sliding in the opposite direction after the frame is locked.

[0028] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: after the teeth of the pressure plate engage with the top surface of the baffle, a one-way anti-retraction is generated, which prevents the sealing baffle from being pushed away from the center of the joint during the vibration process, ensuring that the expansion and contraction allowance always exists, while allowing a small amount of sliding during thermal expansion and contraction, thus taking into account both anti-loosening and free expansion and contraction.

[0029] Furthermore, the elastic connector is a continuous stamped Ω-shaped spring steel sheet with a pair of symmetrical lugs extending outward from each end; the mating ends of the two adjacent sealing baffles are respectively provided with transverse slots with a thickness equivalent to that of the lugs, the slots extend horizontally inward from the end face of the plate and form a tapering step at the bottom of the slot.

[0030] Compared with existing technologies, the beneficial effects of the precast composite slab joint anti-leakage device provided by this utility model are as follows: This utility model abandons conventional thinking and instead constructs a longitudinally expandable elastic sealing barrier at the top of the joint, making the device itself an integral part of the structure. It actively adjusts with changes in the joint width, thereby transforming "error" into "elastic stroke". The sealing baffle is prefabricated in the factory as a composite of elastic metal and flexible rubber, possessing both longitudinal rebound stiffness and surface contact deformation capability. It can conform smoothly along the edge of the composite slab without the need for secondary cutting on site. Adjacent baffles are mutually pulled by hidden wave spring sheets, forming a continuous elastic chain. Regardless of thermal expansion and contraction or concrete lateral pressure, it can maintain a smooth, stepless surface, preventing grout retention. The fixing frame adopts a "top-press, bottom-hook" nail-free clamping method, which can be locked and removed with one hand without damaging the slab edge and leaving no marks after removal, achieving zero-damage installation. The groove wedges tightly, the wing plates clamp tightly, and the device expands upon water absorption. The system employs a three-tiered, synergistic mechanism of secondary water expansion, which increases sealing under pressure and maintains positional stability under vibration and impact, preventing floating and lateral displacement. The entire system is a purely mechanical structure, requiring no electricity or controllers, and can operate in high-temperature, high-humidity, and dusty environments. Installation involves only three steps: insertion, clamping, and film removal. The entire system can be recycled after dismantling, resulting in a high number of reuses and significantly reducing overall costs. Due to the continuous and elastically self-adjusting sealing barrier, on-site installation no longer relies on highly skilled technicians; ordinary workers can install it successfully on the first attempt, greatly reducing rework and cleaning costs. This allows the composite slab system to truly embody the advantages of "fast, economical, and clean" assembly. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is an example diagram of a grout leakage prevention device for prefabricated composite slab joints;

[0033] Figure 2 A front view of a precast composite slab joint leak-proof device;

[0034] The attached diagram lists the components represented by each number as follows:

[0035] 10. Sealing baffle; 20. Elastic connector; 30. Groove; 40. Fixing frame; 41. Crossbeam; 42. Clamping arm. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0037] like Figure 1 , Figure 2 The diagram shown is an example of a precast composite slab joint leak-proof device provided by this utility model, comprising:

[0038] Multiple sealing baffles 10 are arranged sequentially along the joint extension direction, and each sealing baffle 10 has a plate body that can be stretched in the joint width direction.

[0039] The elastic connector 20 is located between two adjacent sealing baffles 10 to elastically connect the adjacent plates, so that the plates can slide relative to each other when subjected to changes in the joint width and automatically adjust the total length.

[0040] The groove portion 30 is formed on both sides of each sealing baffle 10 facing the edge of the prefabricated composite plate and extends continuously along the length of the plate body to receive and fit the edge of the composite plate to form a first seal.

[0041] The fixed frame 40 spans both sides of the joint and is detachably fixed to the precast composite slab. It presses multiple sealing baffles 10 above the joint, so that the groove 30 and the edge of the composite slab remain in continuous contact, thereby forming a second seal.

[0042] The lower ends of the clamping arms on both sides of the fixed frame are provided with transverse hooks. The inner side of the hooks is formed into a supporting step that matches the thickness of the bottom edge of the precast composite slab. The upper end of the frame is equipped with a hand-tightening bolt. After the bolt passes through the crossbeam, it is rotatably connected to a movable pressure plate. Rotating the bolt will cause the movable pressure plate to move down and press against the top surface of the composite slab, thereby clamping and fixing the entire frame to the edge of the composite slab in a "hook-press" composite manner. Rotating the bolt in the opposite direction will release the pressure plate and lift the hook, achieving quick disassembly and assembly without damage.

[0043] In the above technical solution, the sealing baffle 10 is composed of an elastic metal sheet and a flexible sealing layer. The flexible sealing layer covers the lower surface of the elastic metal sheet facing the joint and maintains continuous contact with the joint surface during expansion and contraction.

[0044] Furthermore, in the above technical solution, the elastic connector 20 is a wave spring sheet, and the two ends of the wave spring sheet are respectively embedded in the end slots of the adjacent sealing baffles 10, so that the adjacent plates are always subjected to a rebound force toward the center of the joint during the expansion and contraction process.

[0045] Furthermore, in the above technical solution, the groove portion 30 has an n-shaped cross-section, and its opening width gradually decreases from the bottom of the groove to the opening, which is used to form a wedge-tightening effect after the laminated plate is inserted at the edge.

[0046] Furthermore, in the above technical solution, the fixed frame 40 includes a crossbeam 41 spanning the joint and clamping arms 42 extending downward from both ends of the crossbeam. The inner side of the clamping arms 42 is provided with barbed protrusions for engaging the sides of the prefabricated composite slab to prevent the frame from floating.

[0047] The clamping arm is shaped like a right-angle bend, integrally formed from a vertical arm section and a horizontal arm section. The upper end of the vertical arm section is hinged to the end of the crossbeam, with the hinge axis parallel to the joint direction, allowing the clamping arm to swing vertically to accommodate thickness variations in the laminated slab. A rectangular countersunk groove is milled into the inner side of the vertical arm section, into which replaceable serrated rubber pads are embedded. The protruding teeth of the pads face the side of the laminated slab to increase friction and compensate for side unevenness. The horizontal arm section extends horizontally from the lower end of the vertical arm section, with its end curving upward to form a hook-shaped support. The top surface of the support contacts the edge of the bottom surface of the laminated slab. An elongated oval adjustment hole is opened in the middle of the horizontal arm section, through which a limiting pin passes. The tail of the limiting pin is threaded to the vertical arm section. Rotating the limiting pin changes the effective cantilever length of the horizontal arm section, thus adapting to different slab thicknesses. The entire clamping arm is made of hollow aluminum alloy through extrusion molding, with two symmetrical reinforcing ribs on the inner wall to ensure lightweight design while resisting bending deformation during locking. The outer surface of the arm section is anodized to improve corrosion resistance in humid underground environments. During installation, the horizontal arm section is first hooked into the bottom surface of the composite slab, and then the crossbeam is pressed down. The vertical arm section then swings inward, the serrated rubber pads engage with the side of the slab, and the support hooks and movable pressure plates form an upper and lower clamp, completing a quick fixation without nails or damage.

[0048] Furthermore, in the above technical solution, a downward-protruding arc-shaped pressure strip is provided in the middle of the crossbeam. The lower surface of the arc-shaped pressure strip forms a line contact with the top surface of the uppermost sealing baffle 10, so that the holding force is evenly distributed along the width of the joint.

[0049] Furthermore, in the above technical solution, the sealing baffle 10 is provided with downwardly bent wing plates at both ends. The height of the wing plates in the joint width direction is greater than the depth of the groove 30, which is used to enhance the lateral clamping force on the edge of the composite plate when the slurry pressure increases.

[0050] Furthermore, in the above technical solution, the elastic connector 20 forms a hidden inner cavity between adjacent sealing baffles 10. A water-absorbing expansion strip is pre-placed in the inner cavity. After contacting the slurry moisture, the water-absorbing expansion strip expands along the arrangement direction of the plate to compensate for the gap caused by the rebound of the plate.

[0051] Furthermore, in the above technical solution, a slidable pressure plate is provided between the fixed frame 40 and the sealing baffle 10. The lower surface of the pressure plate is provided with transverse teeth that mesh with the top surface of the sealing baffle 10, which is used to prevent the sealing baffle 10 from sliding in the opposite direction after the frame is locked.

[0052] The crossbeam of the fixed frame can be a continuous long bar or a short crossbeam arranged at certain intervals; its position only needs to ensure that the sealing baffle is evenly pressed on the joint. It is usually placed above the joint area of ​​two adjacent baffles or in the middle of the span, with the principle of "pressing down the joint and taking into account the middle section".

[0053] Furthermore, in the above technical solution, the elastic connector 20 is a spring steel sheet continuously stamped into an Ω shape, with a pair of symmetrical lugs extending outward from each end; the mating ends of the two adjacent sealing baffles 10 are respectively provided with transverse slots with a thickness equivalent to the lugs, the slots extend horizontally inward from the end face of the plate and form a tapering step at the bottom of the slot.

[0054] During assembly, the lug is pushed into the slot horizontally. After the front end of the lug passes the closing step, it springs back to form an inverted lock. At this time, the "Ω" shaped arch protrudes beyond the mating surface of the two plates. When the width of the joint changes, the arch elastically opens and closes, so that the adjacent plates are always subjected to a pulling force pointing towards the center of the joint, thereby achieving a stepless expansion and self-recovering elastic connection.

[0055] Example 1: This example corresponds to a standard residential building's cross-slab splicing scenario. The composite slabs have a uniform thickness, and the splice width varies within a moderate range. On-site requirements emphasize rapid assembly and disassembly, as well as multiple reusability. The sealing baffles are made of annealed stainless steel spring strips and closed-cell foamed EPDM rubber, hot-pressed composites. The steel strips provide longitudinal resilience, while the rubber layer provides surface sealing. "Ω"-shaped wave spring sheets are embedded between adjacent baffles. The lugs at both ends of the spring sheets are horizontally pushed into slots at the baffle ends, forming a continuous elastic chain after being locked in place. This chain can freely expand and contract with temperature changes or concrete lateral pressure. The fixing frame uses extruded aluminum alloy beams with integrally formed clamping arms at both ends. The arm ends are bent inward to form support hooks, which can be hooked into the bottom surface of the composite slab. A hand-tightening bolt is fitted in the middle of the beam, with a movable pressure plate connected to the lower end of the bolt. Rotating the bolt clamps the frame to the edge of the slab without the need for nail holes, and assembly and disassembly take only twenty seconds. The sealing baffle has tapered "n"-shaped grooves stamped on both sides, which wedge tightly with the top and sides of the baffle to form the first seal. The downward-bent flanges at the ends of the baffle flip inward under the pressure of the rising grout, tightening with pressure to form the second self-reinforcing seal. This embodiment requires no electricity and no waiting time for colloid curing. The installation sequence is as follows: joint cleaning, pushing in and connecting the sealing baffle, hooking the frame, hand-tightening, pouring, curing, unhooking in the reverse direction, and finally pulling out the whole thing. It can be reused more than fifty times and is particularly suitable for continuous construction of standard floors in high-rise residential buildings, where the formwork and pipeline layout is regular, the joint width varies little, and situations requiring efficient turnover and zero-damage disassembly and assembly are desired.

[0056] Example 2: This example addresses the joints of long-span composite slabs in large underground commercial spaces. These slabs have large spans, long joints, significant temperature differences, and intersecting electromechanical pipelines, demanding higher standards of sealing continuity. The sealing baffles still consist of a composite of elastic metal sheets and flexible rubber, but a hidden inner cavity is added at the joint of adjacent baffles: a rectangular cavity is formed by a wave-shaped spring sheet and the two side baffles, pre-installed with a modified bentonite-styrene-butadiene rubber blend expansion strip, and covered with a permeable non-woven fabric. During daytime pouring, the concrete temperature is high, the joint is slightly wider, the arch height of the wave-shaped spring sheet increases, and the expansion strip is not yet effective. At night, the temperature drops sharply, the joint shrinks, the wave-shaped spring sheet rebounds to compensate, and the expansion strip absorbs seepage water, increasing in volume to fill any micron-level gaps, achieving a complementary dual mechanism of "thermal expansion and contraction - water expansion". The fixed frame has been replaced with segmented lightweight carbon fiber beams. Each segment can be moved by one person, and the segments are quickly joined together using mortise and tenon joints and pins, accommodating extra-long seams. Replaceable rubber pads with serrated surfaces are added to the inside of the clamping arms to engage with the rough edges of precast slabs and prevent the frame from slipping during long-span vibration. The installation steps are the same as in Example 1, but pins must be inserted to lock the segments after joining. For dismantling, first loosen the hooks, then pull out the pins, and retrieve the segments for easy transport in narrow basements. This example is particularly suitable for projects with large temperature differences, long seams, and high humidity in underground environments. Through the double protection of "elasticity + water absorption and expansion," it ensures a seamless seal over long distances, reducing the impact of later leakage repairs on commercial operations.

[0057] Specifically, the principle of this utility model is as follows: the device is based on elastic expansion and contraction, double sealing, and self-reinforcing locking. It uses the bending strain energy of the elastic metal sheet as the driving force source, converting the change in the joint width into the change in the arch height of the wave spring sheet, thus achieving stepless length adjustment; the flexible rubber layer fills the surface roughness of the plate microscopically and deforms synchronously with the metal sheet macroscopically, maintaining the continuity of the surface seal; the groove adopts a gradually narrowing wedge shape, using the lateral component force during the insertion process to pull down the sealing baffle, so that the rubber layer and the top and side surfaces of the composite plate are simultaneously compressed, forming an initial mechanical seal; the arc-shaped pressure strip of the fixed frame transfers the uniformly distributed load to the top surface of the baffle in a line contact manner, preventing local warping, while allowing the baffle to slide freely in the longitudinal direction, ensuring that the elastic expansion and contraction are not constrained; the wing plate rotates around the bending line under the action of the rising pressure of the slurry. This generates additional lateral constraint force, which, combined with the wedging effect of the groove, forms a positive feedback loop of "pressure-deformation-seal," achieving self-reinforcement. The water-absorbing expansion strip hidden in the inner cavity increases in volume when exposed to water, filling the micro-gaps that may appear due to sudden temperature drops or instantaneous rebound during vibration, forming a secondary water-expansion seal. This complements the mechanical elastic seal, achieving dual protection against both dry and wet conditions. The lugs at both ends of the wave spring plate and the baffle slot form a reverse locking mechanism, ensuring the transmission of tensile force and allowing for reverse withdrawal during maintenance, enabling non-destructive disassembly. The entire system, through the synergistic mechanism of energy storage by elastic elements, pressure amplification by structural profiles, and material water absorption to compensate for gaps, transforms traditional rigid gaps into controllable elastic interfaces. It maintains a highly reliable seal continuously without any external energy, completing the technological paradigm shift from "passive sealing" to "active adaptation."

Claims

1. A precast laminated slab joint leakage slurry device, characterized in that, include: Multiple sealing baffles are arranged sequentially along the joint extension direction, and each sealing baffle has a plate body that can be stretched in the joint width direction; The elastic connector is located between two adjacent sealing baffles to elastically connect the adjacent plates, so that the plates can slide relative to each other when subjected to changes in the width of the joint and automatically adjust the total length. The groove is formed on both sides of each sealing baffle facing the edge of the prefabricated composite plate and extends continuously along the length of the plate to receive and fit the edge of the composite plate to form the first seal. A fixed frame is installed across both sides of the joint and is detachably fixed to the prefabricated composite slab. It presses the multiple sealing baffles above the joint, so that the groove portion and the edge of the composite slab remain in continuous contact, thereby forming a second seal.

2. The precast laminated slab joint leakage preventing slurry device according to claim 1, characterized in that, The sealing baffle is composed of an elastic metal sheet and a flexible sealing layer. The flexible sealing layer covers the lower surface of the elastic metal sheet facing the joint and maintains continuous contact with the joint surface during expansion and contraction.

3. The precast laminated slab joint slurry leakage prevention device according to claim 2, characterized in that, The elastic connector is a wave spring sheet, with both ends of the wave spring sheet being embedded in the end slots of the adjacent sealing baffles, so that the adjacent plates are always subjected to a rebound force toward the center of the joint during the expansion and contraction process.

4. The precast laminated slab joint slurry leakage prevention device according to claim 3, characterized in that, The groove has an n-shaped cross-section, and its opening width gradually decreases from the bottom of the groove to the opening, which is used to form a wedge-tightening effect after the laminated plate is inserted at the edge.

5. The precast laminated slab joint slurry leakage prevention device according to claim 4, characterized in that, The fixed frame includes a crossbeam spanning the seam and clamping arms extending downward from both ends of the crossbeam. The inner side of the clamping arms is provided with barbed protrusions for engaging the sides of the prefabricated composite slab to prevent the frame from floating.

6. A precast composite slab joint leak-proof device according to claim 5, characterized in that, The crossbeam has a downward-protruding arc-shaped pressure strip in the middle. The lower surface of the arc-shaped pressure strip makes line contact with the top surface of the uppermost sealing baffle, so that the holding force is evenly distributed along the width of the joint.

7. A precast composite slab joint leak-proof device according to claim 6, characterized in that, The sealing baffle has downwardly bent wing plates at both ends. The height of the wing plates in the joint width direction is greater than the depth of the groove, which is used to enhance the lateral clamping force on the edge of the composite plate when the slurry pressure increases.

8. A precast composite slab joint leak-proof device according to claim 7, characterized in that, The elastic connector forms a hidden inner cavity between adjacent sealing baffles. A water-absorbing expansion strip is pre-placed in the inner cavity. After contacting the slurry moisture, the water-absorbing expansion strip expands along the arrangement direction of the plate to compensate for the gaps caused by the rebound of the plate.

9. A precast composite slab joint leak-proof device according to claim 8, characterized in that, A slidable pressure plate is provided between the fixed frame and the sealing baffle. The lower surface of the pressure plate is provided with transverse teeth that mesh with the top surface of the sealing baffle, which is used to prevent the sealing baffle from sliding in the opposite direction after the frame is locked.

10. A precast composite slab joint leak-proof device according to claim 9, characterized in that, The elastic connector is a continuous stamped Ω-shaped spring steel sheet with a pair of symmetrical lugs extending outward from each end; the mating ends of the two adjacent sealing baffles are respectively provided with transverse slots with a thickness equivalent to that of the lugs, the slots extend horizontally inward from the end face of the plate and form a tapering step at the bottom of the slot.

Images