Anti-reflux grouting anchoring capsule
By using an expansion bladder made of high-strength rubber material and a grout retention structure, the problem of grout loss in fractured rock formations caused by traditional grouting anchoring bladders has been solved, achieving higher anchoring effect and safety.
Patent Information
- Application Number
- CN202520691606.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-14
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-04-14
AI Technical Summary
Traditional grouting anchoring capsules suffer from severe grout loss in fractured rock formations, resulting in poor anchoring effect, inability to effectively fix rock structures, safety hazards, and wasted engineering costs.
The expansion bladder is made of high-strength, high-flexibility special rubber material. Combined with wavy protrusions, barbed anchoring claws and fissure filling wings, it enhances the mechanical interlocking force between the bladder and the rock. The slurry retention structure and leak-proof skirt slow down the loss of slurry and improve the slurry retention rate.
It significantly enhances anchoring stability, reduces material waste, improves anchoring strength, prevents geological disasters, and reduces project costs.
Smart Images
Figure CN223647843U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of anchor bolt technology, and more specifically, to an anti-backflow grouting anchoring bladder. Background Technology
[0002] Traditional grouting anchoring capsules, as key components for ensuring the stability of underground engineering structures, exhibit serious defects in fractured rock strata. Due to the complex joints and fissures in such strata, when grout is injected into the anchoring capsule, the grout rapidly diffuses and flows away along the fissures, making it difficult to effectively accumulate and solidify in the anchoring area. This significant grout loss not only wastes materials and greatly increases project costs, but more seriously, it prevents the formation of a sufficiently strong anchoring system, resulting in poor anchoring performance. Insufficient anchoring force prevents the rock structure from being effectively restrained, potentially triggering geological disasters such as surrounding rock deformation and collapse during construction disturbances or subsequent operation, seriously threatening the lives of workers, delaying project progress, and causing huge economic losses to the project. Therefore, we propose a backflow-prevention grouting anchoring capsule. Summary of the Invention
[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide an anti-backflow grouting anchoring capsule to solve the technical problem of poor fixation effect in current fractured rock formations.
[0004] To solve the above technical problems, this utility model provides the following technical solution: a backflow prevention grouting anchoring bladder, including an upper support plate, a lower support plate below the upper support plate, an upper anchoring ring and a lower anchoring ring respectively installed on the outer periphery of the upper support plate and the lower support plate, a connecting rod connecting the upper support plate and the lower support plate at the center, a grouting port communicating with the top of the upper support plate, a one-way check valve to prevent backflow installed inside the grouting port, and an expansion bladder fixed between the outer periphery of the upper anchoring ring and the lower anchoring ring;
[0005] The expansion bladder is made of a special rubber material with high strength, high flexibility and chemical corrosion resistance. The expansion bladder is cylindrical in shape. Multiple longitudinal wavy protrusions are arranged on the cylindrical surface along the axial direction. The outer periphery of the expansion bladder is also uniformly distributed with barbed anchoring claws. The tips of the barbed anchoring claws are embedded into the fractures of the broken rock with their tips facing upwards. Several deployable fracture filling wings are arranged at intervals on the surface of the expansion bladder. The expansion bladder is also provided with a slurry retention structure.
[0006] Preferably, the barbed anchoring claw includes a triangular spike with an inclination angle of 30°-45°, and a soft bladder ball is connected to the tip of the triangular spike.
[0007] Preferably, the fissure filling wing comprises a wing plate made of a thin and tough rubber sheet, and a constraint frame is arranged on the periphery of the wing plate, one side of the constraint frame is fixed to the periphery of the inflatable capsule, and the other side of the constraint frame penetrates the side wall of the inflatable capsule.
[0008] Preferably, a sealing rubber is connected to one side of the constraint frame and is fixed to the inner wall of the inflatable capsule and seals the penetrating part, and the thickness of the sealing rubber is greater than that of the inflatable capsule.
[0009] Preferably, the slurry retaining structure comprises a plurality of slurry storage groove columns arranged between two adjacent wave-shaped protrusions and in communication with the interior of the inflatable capsule, and the plurality of slurry storage groove columns form a net frame space.
[0010] Preferably, the slurry retaining structure further comprises a leakage prevention skirt arranged at the top end of the inflatable capsule, and the top of the leakage prevention skirt is tightly attached to the inner top wall of the borehole.
[0011] Preferably, the upper supporting plate further comprises a vacuum extraction pipe connected to the top of the upper supporting plate.
[0012] Compared with the prior art, the utility model has the beneficial effects that:
[0013] 1. The inflatable capsule of the utility model is made of a special rubber material with high strength, high flexibility and chemical corrosion resistance, and cooperates with the wave-shaped protrusions on the surface to significantly increase the contact area and friction with the broken rock. The triangular barb anchor claws are embedded into the rock fissure, and the soft capsule ball is combined with the extrusion of the broken rock layer during grouting, and the fissure filling wing is deeply embedded into the rock fissure, so that the mechanical engagement force and the close combination between the capsule and the rock are greatly enhanced, the anchoring stability is improved, and the problem of poor fixing effect of the broken rock stratum is solved.
[0014] 2. The slurry storage groove columns of the slurry retaining structure store part of the slurry, slow down the diffusion and loss speed of the slurry, maintain a high concentration of the slurry, and provide materials for the continuous cementation reaction. The leakage prevention skirt is tightly attached to the inner top wall of the borehole, prevents the upward loss of the slurry along the gap between the borehole wall and the capsule, effectively improves the retention rate of the slurry in the broken rock, reduces material waste, ensures the anchoring strength, and further solves the problem of poor fixing effect of the broken rock stratum. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the utility model;
[0016] Figure 2 It is a half-sectional structural schematic diagram in the utility model;
[0017] Figure 3 It is a half-sectional structural schematic diagram in the utility model; Figure 2 It is an enlarged structural schematic diagram of the fissure filling wing part in the utility model; It is an enlarged structural schematic diagram of the fissure filling wing part in the utility model;
[0018] Figure 4 It is the structure schematic view of the fissure filling wing in the folded and contracted state in the utility model.
[0019] The label in the drawing is explained: 1, upper supporting plate; 2, lower supporting plate; 3, upper fixed capsule ring; 4, lower fixed capsule ring; 5, connecting rod; 6, grouting port; 7, inflatable capsule; 8, grout retaining structure; 9, vacuum extraction pipe; 10, grout discharge pressure valve;
[0020] 701, wave-shaped protrusion; 72, barb type anchoring claw; 721, triangular spike; 722, soft capsule ball; 73, fissure filling wing; 731, wing plate; 732, constraint frame; 733, sealing rubber; 801, grout storage groove column; 802, leakage prevention skirt. DETAILED DESCRIPTION
[0021] As Figures 1 to 4 shown, the utility model relates to a kind of anti-reflux grouting anchoring capsule, including upper supporting plate 1, lower supporting plate 2 is provided in upper supporting plate 1 lower, upper supporting plate 1 and lower supporting plate 2 outer periphery are equipped with upper fixed capsule ring 3 and lower fixed capsule ring 4 respectively, connecting rod 5 is connected between the center of upper supporting plate 1 and lower supporting plate 2, upper supporting plate 1 top is communicated with grouting port 6, grout discharge pressure valve 10 is installed on lower supporting plate 2, one-way check valve that avoids reflux is installed in grouting port 6, upper fixed capsule ring 3 and lower fixed capsule ring 4 between outer periphery are fixed with inflatable capsule 7, the connecting end of inflatable capsule 7 increases sealing treatment, upper supporting plate 1 top is also connected with vacuum extraction pipe 9, vacuum extraction pipe 9 is used to carry out vacuum extraction to internal inflatable capsule 7 before use, avoid internal air to influence grouting.
[0022] Inflatable capsule 7 is made of high-strength, high-flexibility and chemical corrosion-resistant special rubber material, such as hydrogenated nitrile rubber, which can withstand high grouting pressure, and can deform flexibly in irregular fissures of broken rock, ensuring full contact with rock, inflatable capsule 7 is in the form of a cylinder, inflatable capsule 7 is provided with a plurality of longitudinal wave-shaped protrusions 701 on the surface of the cylinder in the axial direction, the height of the wave-shaped protrusions 701 is preferably 10-15mm, and the wavelength is preferably 30-50mm, which can increase the contact area and friction force between the capsule and the broken rock.
[0023] The periphery of the inflatable capsule 7 is also uniformly distributed with barbed anchor claws 72, the tips of which are embedded in the cracks of the broken rock, the barbed anchor claws 72 including triangular spikes 721 made of high-strength metal (such as alloy steel) in a triangular shape, with a height preferably 8-12 mm and a base width preferably 5-8 mm, the triangular spikes 721 having their tips outwardly inclined at an angle of 30°-45°, when the capsule is inflated and grouted, the triangular spikes 721 are embedded in the cracks of the broken rock, increasing the mechanical interlocking force between the capsule and the rock and improving the anchoring effect, the top end of the triangular spikes 721 being connected to soft sac balls 722, which are thin and soft in shape, and are sucked into the triangular spikes 721 by negative pressure when the inside air of the inflatable capsule 7 is sucked out before insertion, and are inflated when grouting, thereby extruding the gravel layer, filling the cracks and tightly combining with the rock, further enhancing the anchoring stability.
[0024] The surface of the inflatable capsule 7 is provided with a plurality of deployable crack filling wings 73, the crack filling wings 73 including wing plates 731 made of thin and tough rubber sheets, the periphery of the wing plates 731 being provided with constraint frames 732, which constrain the direction of the wing plates 731 when they are received and extended, making insertion more stable, one side of the constraint frame 732 being fixed to the periphery of the inflatable capsule 7, the other side of the constraint frame 732 penetrating the side wall of the inflatable capsule 7, one side of the constraint frame 732 being connected to a sealing rubber 733 fixed to the inner wall of the inflatable capsule 7 and penetrating the part, the thickness of the sealing rubber 733 being greater than that of the inflatable capsule 7, the sealing rubber 733 being molded into an arc block shape when manufactured due to its large thickness, and being in a normal stress-free contracted state as shown in Figure 4 , in combination with the thickness design, it has a large resistance to stress, when grouting, the normal part of the inflatable capsule 7 is grouted first, then the wing plates 731 are extended by pressure and penetrate into the nearby rock cracks, thereby filling the cracks and tightly combining with the rock, further enhancing the anchoring stability.
[0025] After the inside of the capsule is inflated and filled, when a certain pressure is reached, such as the pressure of the pressure relief valve 10 being preferably 2, the outer peripheral area of the inflatable capsule 7 is then grouted, and in order to improve stability, a grout retention structure 8 is also provided on the inflatable capsule 7, the grout retention structure 8 including a plurality of grout storage grooves 801 between two adjacent wave-shaped protrusions 701 and in communication with the inside of the inflatable capsule 7, the plurality of grout storage grooves 801 forming a net frame space, when the grout is injected into the capsule to inflate it, part of the grout is retained in the grout storage grooves 801 between the wave-shaped protrusions 701, and since the grout storage grooves 801 are relatively closed, the grout is not easy to quickly spread and lose, so that the grout concentration in this area can be kept at a high level for a long time, and in the cementation process, a higher grout concentration means more cementing material, the grout stored in the grout storage grooves 801 provides a continuous source of cementing material for the local area, and even if the grout in the surrounding other areas may be reduced due to various reasons (such as rock fracture connection leading to loss), the grout in the grout storage grooves 801 can still continue to participate in the cementation reaction, the wave-shaped protrusions 701 and the plurality of grout storage grooves 801 form a certain geometric shape and space limitation, slow down the grout loss rate, enhance the interaction with the rock, and improve the retention rate of the grout in the broken rock.
[0026] The grout retention structure 8 also includes a leakage prevention skirt 802, which is located at the top end of the inflatable capsule 7, and the top of the leakage prevention skirt 802 is tightly attached to the inner top wall of the borehole, and the leakage prevention skirt 802 is made of the same rubber material as the capsule body, and the width is preferably 20-30mm, when the capsule is inserted into the borehole, the leakage prevention skirt 802 is tightly attached to the borehole wall, preventing the grout from flowing upward along the gap between the borehole wall and the capsule, and playing a leakage prevention role.
[0027] The embodiments of the utility model discloses the preferable embodiment, but is not limited to this, and the ordinary skill of the art, the spirit of the utility model is appreciated to the above-mentioned embodiment, and different induction and change are made, but as long as not departing from the spirit of the utility model, are in the protection range of the utility model.
Claims
1. A backflow prevention grouting anchoring capsule, characterized in that, Includes an upper support plate (1), a lower support plate (2) is provided below the upper support plate (1), an upper retaining ring (3) and a lower retaining ring (4) are respectively installed on the outer periphery of the upper support plate (1) and the lower support plate (2), a connecting rod (5) is connected at the center between the upper support plate (1) and the lower support plate (2), a grouting port (6) is connected to the top of the upper support plate (1), a grout discharge pressure valve (10) is installed on the lower support plate (2), a one-way check valve to prevent backflow is installed inside the grouting port (6), and an expansion bladder (7) is fixed between the outer periphery of the upper retaining ring (3) and the lower retaining ring (4). The expansion bladder (7) is made of a special rubber material with high strength, high flexibility and chemical corrosion resistance. The expansion bladder (7) is cylindrical in shape. The expansion bladder (7) has multiple longitudinal wavy protrusions (701) arranged along the axial direction on the cylindrical surface. The expansion bladder (7) also has barbed anchoring claws (72) evenly distributed on its outer periphery. The barbed anchoring claws (72) are embedded in the fractured rock fissures with their tips pointing upwards. The expansion bladder (7) has several deployable fissure filling wings (73) spaced apart on its surface. The expansion bladder (7) also has a slurry retention structure (8).
2. The anti-backflow grouting anchoring capsule according to claim 1, characterized in that, The barbed anchor claw (72) includes a triangular spike (721) with an inclination angle of 30°-45°, and a soft sac ball (722) is connected to the top of the triangular spike (721).
3. The anti-backflow grouting anchoring capsule according to claim 2, characterized in that, The rift filling wing (73) includes a wing plate (731) made of a thin and tough rubber sheet. A constraint frame (732) is provided on the outer periphery of the wing plate (731). One side of the constraint frame (732) is fixed to the outer periphery of the expansion bladder (7), and the other side of the constraint frame (732) passes through the side wall of the expansion bladder (7).
4. The anti-backflow grouting anchoring bladder according to claim 3, characterized in that, The constraint frame (732) is connected to a sealing rubber (733) on one side, which is fixed to the inner wall of the expansion bladder (7) and seals the portion that passes through it. The thickness of the sealing rubber (733) is greater than that of the expansion bladder (7).
5. The anti-backflow grouting anchoring bladder according to claim 4, characterized in that, The slurry retention structure (8) includes multiple slurry storage columns (801), which are located between two adjacent wavy protrusions (701) and are interconnected with the interior of the expansion bladder (7). The multiple slurry storage columns (801) form a mesh frame space.
6. The anti-backflow grouting anchoring bladder according to claim 5, characterized in that, The slurry retention structure (8) also includes a leak-proof skirt (802), which is located at the top of the expansion bladder (7), and the top of the leak-proof skirt (802) is in close contact with the inner top wall of the borehole.
7. The anti-backflow grouting anchoring bladder according to claim 6, characterized in that, The top of the upper support plate (1) is also connected to a vacuum tube (9).