A reinforced bladder-type expanded grouting anchor with both exhaust and anti-slurry backflow

Abstract

The present invention discloses a reinforced bladder-type expanded grouting anchor rod with both exhaust and slurry backflow prevention, relating to the technical field of expanded anchor rods. In the present invention, an inclined channel will be left between two adjacent elastic bladders when they expand. The slurry at the bottom can lift up some broken soil and impurities at the bottom of the foundation pit when floating up and discharge them to the surface smoothly through the inclined channel. The slurry grouting at the bottom can subsequently completely replenish the inclined channel, and after solidification, a staggered relationship with the elastic bladder height compensation can be formed. Compared with the traditional straight-cylinder bladder, the elastic bladder with a small-angle spiral design and the slurry in the inclined channel form a mutually restraining and mutually limiting gripping force, especially in the vertical direction, to achieve a more significant anti-floating effect. Moreover, the inclined channel can also prevent the gas isolation problem caused by incomplete or untimely discharge of gas in the foundation pit due to excessive grouting pressure, thereby further improving the exhaust efficiency of foundation pit grouting.

Description

Technical Field

[0001] The invention relates to the technical field of expanded anchor rods, in particular to a reinforced bladder-type expanded grouting anchor rod with the functions of exhaust and slurry backflow prevention. Background Art

[0002] The bladder-type expanded anchor rod is a relatively commonly used anchor support structure at present. For example, the bladder-type expanded anchor rod with publication number CN219298201U has both exhaust and anti-slurry backflow grouting functions. During the grouting process, the excess slurry can be injected into the external exhaust pipe. The construction personnel can judge whether the amount of slurry in the bladder bag is sufficient by observing whether the slurry leaks out of the external exhaust pipe. The setting of one-way valve 1 and one-way valve 2 ensures the exhaust stability of the anchor rod and avoids slurry backflow during use, thereby ensuring the use of the anchor rod, making the grouting body density sufficient to achieve compressive strength, and avoiding the overflow of part of the pressure slurry squeezed in the bladder when removing the external grouting pipe and the external exhaust pipe, thereby ensuring the bearing capacity of the anchor rod. At the same time, after the external grouting pipe and the external exhaust pipe are pulled out, the gas in the airbag returns to the air cavity, the air cavity is filled and bulged, and the inside of the connecting ring is sealed.

[0003] Before anchoring, it is necessary to drill holes at the punctuation points, and then use a water jet (water jet cutting) to expand the holes while flushing the drilled debris to the bottom of the pit to ensure that the side walls of the foundation pit are smooth. Then, the bladder-type expanded anchor rod is put in for grouting. First, the bladder is grouted to expand it to form a sealing seal, and then the grout is discharged from the bottom of the anchor rod to fill the remaining space of the foundation pit. The expansion of the bladder is used to achieve the sealing seal and play a role in anchoring the foundation pit with tension resistance and anti-floating properties. However, in the existing technology (including the above-mentioned patented technology), the main function of the expanded bladder of the grouting anchor rod is to form a sealing whole, and the filling of the bottom space is completed by grouting at the bottom of the anchor rod. At the same time, the bottom grouting can also fill the gap between the bladder and the foundation pit, increasing the integrity and anti-floating effect.

[0004] In fact, the gripping force between the foundation pit and the foundation pit is mainly provided by the solidified slurry injected from the bottom. Because the bottom pressure grouting will fill the slurry with a large pressure into the gap between the foundation pit and the stratum to form extrusion, and the slurry will penetrate into the stratum and form a stable gripping force after solidification, and the bag is responsible for providing counterweight. However, after expansion, the smooth and regular outer wall of the bag loses the gripping force between the stratum. The foundation pit is separated by the bag into two relatively independent parts: the slurry column inside the bag and the base column outside the bag. Therefore, for the anchor rod, its anti-floating property can only be provided by the counterweight of the slurry column inside the external bag. Moreover, as time goes by, the problem of loss of gripping force between the two independent parts will become more and more obvious after the bag is corroded and damaged.

[0005] In addition, after the columnar expanded bag is sealed after the slurry solidifies, there is a certain gap between it and the foundation pit for the bottom slurry to spread and rise and lift up and discharge impurities such as broken soil at the bottom of the foundation pit, but the small gap has a high obstruction to the broken soil, and some broken soil impurities will still remain and mix in the slurry in the foundation pit, affecting the integrity of the slurry after solidification.

[0006] In view of the above problems, it is urgent to carry out innovative design based on the original bladder expansion grouting anchor. Summary of the Invention

[0007] The technical solution of the present invention addresses the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technology. Specifically, the purpose of the present invention is to provide a reinforced bag-type expandable grouting anchor rod with both exhaust and anti-slurry backflow, so as to solve the above-mentioned background technology that the bag with a smooth and regular outer wall loses its grip on the formation after expansion, and the foundation pit is separated by the bag into two relatively independent parts: the slurry column inside the bag and the base column outside the bag. Therefore, for the anchor rod, its anti-buoyancy can only be provided by the counterweight of the slurry column inside the external bag, and as time goes by, the problem of lack of grip between the two independent parts will become more and more obvious after the bag is corrupted and damaged.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a reinforced, vented, and slurry-backflow-preventing bladder-type expandable grouting anchor, comprising an anchor body, a first grouting annulus opened at the center of the anchor body for receiving external slurry, anvils concealed at equal angles at the upper and lower ends of the anchor body, which are driven by the slurry pressure in the first grouting annulus to extend adaptively, and an elastic bladder surrounding the anchor body at equal angles, which is expanded by the slurry after the anvils are fully extended.

[0009] The lower end of the anchor rod body is provided with a slurry outlet channel which opens adaptively after the needle is fully extended.

[0010] Preferably, a grouting pipe is fixed to the upper end of the anchor body, and a connecting channel communicating with the grouting pipe is opened at the upper end of the first grouting annular cavity.

[0011] Preferably, an upper channel and a lower channel are symmetrically opened at the upper and lower ends of the first grouting ring cavity for pressurizing the needle grouting at the upper and lower ends.

[0012] Preferably, annular pressure chambers are symmetrically provided at the upper and lower ends of the anchor body, and the upper channel and the lower channel are respectively connected to the two annular pressure chambers;

[0013] Pressure rings are provided in the interiors of the two annular pressure chambers in a sealing and sliding manner.

[0014] Preferably, a limiting groove is formed through the side wall of the anchor rod body for the needle to extend and slide, and a limiting plate is fixed to the outer wall of the needle located in the limiting groove;

[0015] A pressing spring is wound around the outer wall of the pressing needle, one end of the pressing spring is welded to the side of the limiting plate, and the other end of the pressing spring is fixed to the inner wall of the limiting groove.

[0016] Preferably, the end of the needle is inserted into the interior of the annular pressure chamber and is spherical;

[0017] The surface of the pressure ring close to the needle is designed to be arc-shaped, and the arc-shaped surface of the pressure ring fits with the spherical end of the needle.

[0018] Preferably, a second grouting annular cavity is provided at the lower end of the anchor body, and through holes corresponding to the number of elastic bags are provided at equal angles at the upper end of the second grouting annular cavity;

[0019] The lower end of the elastic bag is connected to the second grouting ring cavity through a through hole, and the elastic bag is fixedly connected to the outer wall of the upper end of the anchor rod body.

[0020] Preferably, a U-shaped connecting channel is provided between the side of the second grouting annular cavity and the side wall of the annular pressure cavity;

[0021] The lower end of the U-shaped connecting channel is blocked by the side wall of the pressure ring.

[0022] Preferably, the elastic sac is a spiral hollow design.

[0023] Preferably, the upper end of the slurry outlet channel is connected to the side of the annular pressure chamber at the lower end and is blocked by the side wall of the pressure ring;

[0024] The lower surface of the anchor rod body is provided with a side slurry discharge groove communicated with the side edge of the anchor rod body, and the lower end of the slurry outlet channel passes through the side slurry discharge groove.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] During external grouting, the slurry will enter the two annular pressure chambers at the upper and lower ends of the anchor body from the upper and lower channels respectively, and push the pressure ring so that its arc surface contacts the spherical ends of the pins, producing a horizontal squeezing and pushing effect, causing a number of pins distributed at equal angles at the upper and lower ends of the anchor body to gradually extend from the limit grooves. The pins gradually extending from the upper and lower ends of the anchor body will gradually contact the inner wall of the foundation pit, which will play a certain centering and guiding role on the anchor body. On the other hand, when grouting at the bottom of the anchor body, it will play a certain gripping role on the anchor body, alleviating the ups and downs of the anchor body caused by the reaction between the hydraulic pressure and the bottom of the foundation pit.

[0027] When the pressure ring moves to the maximum stroke, the slurry outlet of the slurry outlet channel and the slurry inlet of the second grouting ring cavity are synchronously exposed in the grouting area inside the lower end annular pressure cavity. Therefore, the slurry will be injected into the second grouting ring cavity from the U-shaped connecting channel and discharged into the foundation pit from the slurry outlet channel at the same time. The slurry entering the second grouting ring cavity will be homogenized and evenly distributed to the corresponding elastic bag through the through hole, so that the elastic bag will gradually expand, and an inclined channel will be left between the two adjacent elastic bags when they expand. The slurry grouting from the bottom of the anchor body can lift some broken soil and impurities at the bottom of the foundation pit and pass smoothly through the space between the two adjacent elastic bags. The inclined channel is discharged to the surface, and the slurry grouting from the bottom of the anchor body can completely replenish the inclined channel. After solidification, it can form a staggered relationship with the elastic bag height compensation. Compared with the traditional straight-cylinder bag, the elastic bag with a small-angle spiral design and the slurry in the inclined channel form a mutually restraining and limiting gripping force, especially in the vertical direction, which achieves a more significant anti-floating effect. Moreover, the inclined channel between two adjacent elastic bags can also prevent the gas separation problem caused by incomplete or untimely discharge of gas in the foundation pit due to excessive grouting pressure, further improving the exhaust efficiency of foundation pit grouting.

[0028] After the grouting is completed, since the slurry has not solidified and is still in a fluid state with less resistance at this stage, when the hydraulic pressure is disconnected, the tightening spring will drive the needle to retract and reset inward, so that several needles distributed at equal angles at the upper and lower ends of the anchor body are retracted into the interior of the anchor body and the pressure ring is pushed back to the initial position to form a re-closure of the slurry outlet of the slurry channel and the slurry inlet of the second grouting ring cavity (U-shaped connecting channel), which can effectively prevent the slurry in the foundation pit from flowing back into the lower channel, and also play a locking role in preventing the slurry inside the elastic bag from backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0030] Figure 2 It is a schematic diagram of the combined structure of the pulp discharge channel and the side pulp discharge trough of the present invention.

[0031] Figure 3 It is a schematic diagram of the three-dimensional structure of the anchor rod body after being cut open.

[0032] Figure 4 It is a schematic diagram of the three-dimensional structure of the anchor rod body and pressure ring and other parts after they are completely cut apart.

[0033] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle.

[0034] Figure 6 For the present invention Figure 4A schematic diagram of the enlarged section of the main structure in the lower middle part.

[0035] Figure 7 It is a schematic diagram of the three-dimensional structure of the elastic bladder of the present invention.

[0036] In the figure: 1. Anchor body; 11. First grouting ring cavity; 12. Upper channel; 13. Lower channel; 2. Grouting pipe; 3. Annular pressure chamber; 31. Pressure ring; 32. Butt needle; 33. Tightening spring; 4. Second grouting ring cavity; 5. Elastic bladder; 6. Slurry outlet channel; 7. Side slurry discharge groove. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] See also Figures 1 to 7 The present invention provides a technical solution: a reinforced bladder-type expandable grouting anchor with both exhaust and slurry backflow prevention, comprising an anchor body 1, a first grouting annulus 11 opened at the center of the anchor body 1 for receiving external slurry, annular pins 32 equiangularly hidden and arranged at the upper and lower ends of the anchor body 1 and adaptively extended by the slurry pressure driven by the first grouting annulus 11, and an elastic bladder 5 equiangularly surrounding the outside of the anchor body 1 and expanding by the slurry after the annular pins 32 are fully extended;

[0039] A slurry outlet channel 6 is provided through the lower end of the anchor body 1 and is adaptively opened after the needle 32 is fully extended.

[0040] As this embodiment, a steel bar hole is opened at the center of the anchor rod body 1, which runs through from top to bottom. Its purpose is to connect the base plate of the upper building and the anchor rod in the foundation pit, to form a downward pulling force on the building base plate, and to achieve the purpose of anti-floating of the building base plate. This is the existing technology and the present invention will not go into details.

[0041] A grouting pipe 2 is fixed to the upper end of the anchor body 1 , and a connecting channel communicating with the grouting pipe 2 is opened at the upper end of the first grouting annular cavity 11 .

[0042] As this embodiment, a threaded interface is provided at the upper end of the grouting pipe 2 to facilitate connection with external grouting equipment. At the same time, the grouting pipe 2 is always connected to the first grouting ring cavity 11 through the connecting channel.

[0043] An upper channel 12 and a lower channel 13 are symmetrically formed at the upper and lower ends of the first grouting ring cavity 11 for pressurizing the grouting needles 32 at the upper and lower ends.

[0044] As this embodiment, the stroke and channel diameter of the upper channel 12 and the lower channel 13 are the same, which is conducive to the symmetrical transmission of the external input slurry pressure along the upper channel 12 and the lower channel 13, and further helps to ensure the synchronization of the internal structure operation of the upper and lower ends of the anchor rod body 1.

[0045] Annular pressure chambers 3 are symmetrically provided at the upper and lower ends of the anchor body 1, and the upper channel 12 and the lower channel 13 are respectively connected to the two annular pressure chambers 3;

[0046] Pressure rings 31 are provided inside the two annular pressure chambers 3 in a sealing and sliding manner.

[0047] As this embodiment, the pressure ring 31 arranged at the upper end of the anchor rod body 1 is only used to cooperate with the several needles 32 at the upper end to realize the extension and retraction of the needles 32, while the pressure ring 31 arranged at the lower end of the anchor rod body 1 is not only used to cooperate with the several needles 32 at the lower end to realize the extension and retraction of the needles 32, but also realizes the opening and closing of the inlet of the elastic bladder 5 and the opening and closing of the slurry outlet channel 6 through the side wall of the lower end pressure ring 31.

[0048] The side wall of the anchor rod body 1 is provided with a limit groove for the needle 32 to extend and slide, and the outer wall of the needle 32 located in the limit groove is fixed with a limit plate;

[0049] A pressing spring 33 is wound around the outer wall of the pressing needle 32 , and one end of the pressing spring 33 is welded to the side of the limiting plate, and the other end of the pressing spring 33 is fixed to the inner wall of the limiting groove.

[0050] As this embodiment, during grouting, the pins 32 at the upper and lower ends of the anchor body 1 will be pushed out under the action of the slurry pressure and form a connection with the inner wall of the foundation pit. On the one hand, the relative stability of the upper and lower ends of the anchor body 1 during pressure grouting is increased. On the other hand, the pins 32 distributed at equal angles at the upper and lower ends are extended at the same time and hit the foundation pit wall at the same time, which plays a certain degree of centering and correcting role on the anchor body 1. After the grouting is completed, due to the stop of hydraulic pressure, the pins 32 distributed at equal angles will automatically retract into the interior of the anchor body 1 under the reset action of the tightening spring 33 and push the pressure ring 31 back to its initial position. On the one hand, it prevents the slurry in the foundation pit from flowing back into the lower channel 13, and at the same time it can also lock the slurry inside the elastic bladder 5.

[0051] The end of the needle 32 is inserted into the annular pressure chamber 3 and is spherical in shape;

[0052] The surface of the pressure ring 31 close to the annulus 32 is designed to be arc-shaped, and the arc-shaped surface of the pressure ring 31 fits closely with the spherical end of the annulus 32 .

[0053] As this embodiment, through the fitting contact between the curved surface of the pressure ring 31 and the spherical end of the needle 32, and the limiting effect on the pressure ring 31 and the needle 32, the vertical extrusion force of the pressure ring 31 can be converted into a horizontal thrust on the needle 32 and cause it to move horizontally. Similarly, the horizontal extrusion force of the needle 32 on the pressure ring 31 can be converted into a vertical thrust on the pressure ring 31 and cause it to move vertically.

[0054] A second grouting annular cavity 4 is formed at the lower end of the anchor body 1, and through holes corresponding to the number of elastic bags 5 are formed at equal angles at the upper end of the second grouting annular cavity 4.

[0055] The lower end of the elastic bag 5 is connected to the second grouting ring cavity 4 through a through hole, and the elastic bag 5 is fixedly connected to the outer wall of the upper end of the anchor body 1.

[0056] As for this embodiment, the elastic bladder 5 is initially in a deflated state due to its high material elasticity. Therefore, after the slurry is injected into the elastic bladder 5 from the lower end, the elastic bladder 5 will gradually expand to a value many times that of the initial state. The upper and lower ends of the elastic bladder 5 shown in the accompanying drawings are elliptical in shape to assist understanding. In fact, the inner wall of the elastic bladder 5, which is initially in a deflated state, is almost fitted together, and there is almost no air inside, so the effect of the gas is minimal.

[0057] A U-shaped connecting channel is provided between the side of the second grouting annular cavity 4 and the side wall of the annular pressure cavity 3;

[0058] The lower end of the U-shaped connecting channel is blocked by the side wall of the pressure ring 31 .

[0059] As this embodiment, when the pressure ring 31 at the lower end falls to a certain extent under the action of the slurry pressure, the lower end of the U-shaped connecting channel will form a through connection with the annular pressure chamber 3, so that the slurry inside the annular pressure chamber 3 can be stably injected into the elastic bag 5 through the U-shaped connecting channel, the second grouting ring cavity 4 and the through hole in turn.

[0060] The elastic bag 5 is of a spiral hollow design.

[0061] As this embodiment, the elastic bag 5 with a small-angle spiral design is the core invention of the present invention. Simply put, the elastic bag 5 in an inclined posture will still maintain the inclined posture after being expanded by the grouting, and an inclined channel will be left between the two adjacent elastic bags 5. The slurry grouting from the bottom of the anchor body 1 can lift some broken soil and impurities at the bottom of the foundation pit and smoothly discharge them to the surface through the inclined channel between the two adjacent elastic bags 5. At the same time, the slurry grouting from the bottom of the anchor body 1 can completely replenish the inclined channel, and after solidification, a dislocation relationship with the elastic bag 5 can be formed to compensate for the height. Compared with the traditional straight-cylinder bag, the elastic bag 5 with a small-angle spiral design and the slurry in the inclined channel form a mutually restraining and mutually limiting gripping force, especially in the vertical direction, to achieve a more significant anti-floating effect.

[0062] In addition, the inclined channel between two adjacent elastic bags 5 can also prevent the problem of air separation caused by incomplete or untimely discharge of gas in the foundation pit due to excessive grouting pressure (air separation will cause large bubbles to form inside the concrete in the foundation pit. Normal grouting operations will be followed by vibration, one of the purposes of which is to eliminate the residual air separation inside the slurry and improve the stability after solidification. However, inside the foundation pit, the ring seal setting of the bag is not suitable for eliminating the air separation by vibration, so it can only be alleviated by reducing the grouting rate and improving the exhaust efficiency).

[0063] The upper end of the slurry outlet channel 6 is connected to the side of the annular pressure chamber 3 at the lower end and is blocked by the side wall of the pressure ring 31;

[0064] A side slurry discharge groove 7 communicating with the side of the anchor body 1 is provided on the lower surface of the anchor body 1 , and the lower end of the slurry discharge channel 6 passes through the side slurry discharge groove 7 .

[0065] As this embodiment, since the anchor rod body 1 will be in contact with the bottom of the foundation pit, if the lower end of the slurry outlet channel 6 is directly in contact with the bottom of the foundation pit, the anchor rod body 1 will be frequently lifted up under the action of the slurry pressure. Therefore, in the present invention, a side slurry discharge groove 7 connected to the side of the anchor rod body 1 is opened at the bottom of the anchor rod body 1. The slurry discharged from the slurry outlet channel 6 can enter the side slurry discharge groove 7, and then be stably discharged into the foundation pit through the branch of the side slurry discharge groove 7 connected to the side of the anchor rod body 1.

[0066] Working principle: When using this reinforced bladder-type expansion grouting anchor with both exhaust and anti-slurry backflow, first place the anchor body 1 in the foundation pit after the hole has been opened and expanded (for specific preparation work, please refer to the second paragraph of the background technology) so that it is in a relatively central position, and then the external grouting equipment port is connected to the inside of the anchor body 1 through the grouting pipe 2, and stable grouting is started.

[0067] Reference Attachment Figure 3 and attached Figure 4The pressure slurry entering the grouting pipe 2 will be stably transported to the first grouting ring cavity 11 located in the middle of the anchor body 1 through the connecting channel, and then distributed to the upper channel 12 and the lower channel 13 symmetrically arranged. The slurry will enter the two annular pressure chambers 3 at the upper and lower ends of the anchor body 1 from the upper channel 12 and the lower channel 13 respectively and produce an extrusion and pushing effect on the pressure ring 31, so that the pressure ring 31 moves stably along the inner wall of the annular pressure chamber 3 and produces a horizontal extrusion and pushing effect through its own arc surface to the spherical end of the needle 32 (wherein the pressure The transmission is in the form of hydraulic pressure, so the squeezing force on the pressure ring 31 will be relatively dispersed and uniform), so that the plurality of pins 32 distributed at equal angles at the upper and lower ends of the anchor body 1 gradually extend from the limit groove and compress the corresponding tightening springs 33, and the pins 32 gradually extending from the upper and lower ends of the anchor body 1 will gradually contact the inner wall of the foundation pit, on the one hand, playing a certain centering and correcting role for the anchor body 1, on the other hand, playing a certain gripping role for the anchor body 1 when grouting at the bottom of the anchor body 1, thereby facilitating the alleviation of the ups and downs of the anchor body 1 caused by the reaction between the hydraulic pressure and the bottom of the foundation pit;

[0068] Then, as attached Figure 6 As shown, as the lower pressure ring 31 gradually falls and the needle 32 gradually extends, the side wall of the pressure ring 31 gradually passes over the slurry inlet of the slurry outlet channel 6 and the slurry inlet of the U-shaped connecting channel. Therefore, when the pressure ring 31 moves to the maximum stroke, the slurry inlet of the slurry outlet channel 6 and the slurry inlet of the second grouting ring cavity 4 (U-shaped connecting channel) are synchronously exposed to the grouting area inside the lower annular pressure chamber 3, and at this time the upper channel 12 is saturated, and the injected slurry is only injected into the lower annular pressure chamber 3 through the lower channel 13, and then injected into the second grouting ring cavity 4 through the U-shaped connecting channel and discharged into the foundation pit through the slurry outlet channel 6. The slurry entering the second grouting ring cavity 4 will be homogenized and evenly distributed to the corresponding elastic bag 5 through the through hole, so that the elastic bag 5 gradually expands, and at the same time, an inclined channel ( In fact, it is a spiral shape with a small angle, and the description of the inclined channel is only for the convenience of understanding). The slurry grouting from the bottom of the anchor body 1 can lift up some broken soil and impurities at the bottom of the foundation pit and discharge them to the surface smoothly through the inclined channel between the two adjacent elastic bags 5. At the same time, the slurry grouting from the bottom of the anchor body 1 can completely replenish the inclined channel, and after solidification, it can form a staggered relationship with the elastic bag 5 that compensates for the height. Compared with the traditional straight-cylinder bag, the elastic bag 5 with a small-angle spiral design forms a mutually restraining and mutually limiting gripping force with the slurry in the inclined channel, especially in the vertical direction, achieving a more significant anti-floating effect. Moreover, the inclined channel between the two adjacent elastic bags 5 can also prevent the gas isolation problem caused by incomplete or untimely discharge of gas in the foundation pit due to excessive grouting pressure, further improving the foundation pit grouting exhaust efficiency.

[0069] Finally, after the grouting is completed, since the slurry has not solidified and is still in a fluid state with less resistance at this stage, when the hydraulic pressure is disconnected, the tightening spring 33 will drive the needle 32 to retract and reset inward, so that the several needles 32 distributed at equal angles at the upper and lower ends of the anchor body 1 are retracted into the annular pressure chamber 3 in the anchor body 1, and the pressure ring 31 is pushed back to the initial position to form a re-closure of the slurry outlet channel 6 and the slurry inlet of the second grouting ring cavity 4 (U-shaped connecting channel), which can effectively prevent the slurry in the foundation pit from flowing back into the lower channel 13, and also play a locking role in preventing the slurry inside the elastic bag 5 from backflow.

[0070] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A reinforced bladder-type expanded grouting anchor with both exhaust and anti-slurry backflow functions, comprising an anchor body (1), characterized in that: It also includes a first grouting ring cavity (11) opened at the center of the anchor rod body (1) for receiving external slurry, a needle (32) arranged at equal angles and hidden at the upper and lower ends of the anchor rod body (1) and driven by the slurry pressure of the first grouting ring cavity (11) to extend adaptively, and an elastic bag (5) surrounding the outside of the anchor rod body (1) at equal angles and expanding due to the slurry after the needle (32) is fully extended. The lower end of the anchor rod body (1) is provided with a slurry outlet channel (6) which opens adaptively after the needle (32) is fully extended. The upper and lower ends of the first grouting ring cavity (11) are symmetrically provided with an upper channel (12) and a lower channel (13) for pressurizing the grouting of the needles (32) at the upper and lower ends; Annular pressure chambers (3) are symmetrically provided at the upper and lower ends of the anchor rod body (1), and the upper channel (12) and the lower channel (13) are respectively connected to the two annular pressure chambers (3), and pressure rings (31) are provided inside the two annular pressure chambers (3) in a sealing and sliding manner. The end of the needle (32) is inserted into the interior of the annular pressure chamber (3) and is spherical; The surface of the pressure ring (31) close to the needle (32) is designed to be arc-shaped, and the arc-shaped surface of the pressure ring (31) fits with the spherical end of the needle (32); The lower end of the anchor rod body (1) is provided with a second grouting annular cavity (4), and the upper end of the second grouting annular cavity (4) is provided with through holes corresponding to the number of elastic bags (5) at equal angles; The lower end of the elastic bag (5) is connected to the second grouting ring cavity (4) through a through hole, and the elastic bag (5) is fixedly connected to the outer wall of the upper end of the anchor rod body (1); A U-shaped connecting channel is provided between the side of the second grouting ring cavity (4) and the side wall of the annular pressure cavity (3), and the lower end of the U-shaped connecting channel is blocked by the side wall of the pressure ring (31).

2. A reinforced bladder-type expanded grouting anchor with both exhaust and slurry backflow prevention according to claim 1, characterized in that: A grouting pipe (2) is fixed to the upper end of the anchor rod body (1), and a connecting channel communicating with the grouting pipe (2) is provided at the upper end of the first grouting annular cavity (11).

3. The reinforced bladder-type expanded grouting anchor with both exhaust and slurry backflow prevention function according to claim 1, characterized in that: A limiting groove for the needle (32) to slide and retract is formed through the side wall of the anchor rod body (1), and a limiting plate is fixed to the outer wall of the needle (32) located in the limiting groove; A pressing spring (33) is wound around the outer wall of the pressing needle (32), one end of the pressing spring (33) is welded to the side of the limiting plate, and the other end of the pressing spring (33) is fixed to the inner wall of the limiting groove.

4. The reinforced bladder-type expanded grouting anchor with both exhaust and slurry backflow prevention according to claim 1, characterized in that: The elastic bladder (5) is of a spiral hollow design.

5. The reinforced bladder-type expanded grouting anchor with both exhaust and slurry backflow prevention function according to claim 4, characterized in that: The upper end of the slurry outlet channel (6) is connected to the side of the annular pressure chamber (3) at the lower end and is blocked by the side wall of the pressure ring (31); A side slurry discharge groove (7) communicating with the side of the anchor body (1) is provided on the lower surface of the anchor body (1), and the lower end of the slurry discharge channel (6) passes through the side slurry discharge groove (7).

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