Reinforced bag type expansion grouting anchor rod with exhaust and grout backflow prevention functions

Abstract

The invention discloses a reinforced bag type expansion grouting anchor rod with the exhaust function and the grout backflow prevention function, and relates to the technical field of expansion anchor rods. When floating upwards, the grout at the bottom can jack up some broken soil and impurities at the bottom of the foundation pit and smoothly discharge the broken soil and impurities to the surface through the inclined channel, the grout grouted at the bottom can subsequently and completely supplement the inclined channel, and after solidification, the staggered relation with the height compensation of the elastic bag can be formed. Mutual restraining and limiting grasping force is formed between the elastic bag designed in a small-angle spiral mode and slurry in the inclined channel, and especially in the vertical direction, the remarkable anti-floating effect is achieved. And moreover, the inclined channel can also prevent the problem of gas separation caused by incomplete or late discharge of gas in the foundation pit due to overlarge grouting pressure, so that the exhaust efficiency of foundation pit grouting is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of expanding bolts, and specifically to a reinforced capsule-type expanding grouting bolt with exhaust function and preventing slurry backflow. Background Art

[0002] The capsule-type expanding bolt is a commonly used anchoring and supporting structure at present. For example, a capsule-type expanding bolt with exhaust and preventing slurry backflow grouting functions, with the publication number CN219298201U, can inject the excess slurry into the external exhaust pipe during the grouting process. The construction workers can judge whether the slurry volume in the capsule is sufficient by observing whether the slurry seeps out of the external exhaust pipe. The setting of check valve 1 and check valve 2 ensures the stable exhaust during the use of the bolt and avoids the slurry backflow, ensuring the use of the bolt, making the grouting body density sufficient to ensure the compressive strength, and avoiding the partial pressure slurry in the capsule being squeezed out when removing the external grouting pipe and the external exhaust pipe, ensuring the bearing capacity of the bolt. 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 inside of the air chamber again, and the air chamber swells and bulges, cooperating to seal the inside of the connecting ring.

[0003] Before anchoring, a hole needs to be drilled at the punctuation position first, and then the hole is expanded by a water jet (water jet cutting) while the drilling slag is washed to the bottom of the pit to ensure the smoothness of the foundation pit side wall. Then the capsule-type expanding bolt is dropped into the pit for grouting. First, the capsule is grouted to make it expand to form a seat seal, and then the remaining space in the foundation pit is grouted and filled through the slurry outlet at the bottom of the bolt. The expansion of the capsule is used to form a seat seal and play the role of tensile and anti-floating foundation pit anchoring. However, in the prior art (including the above-mentioned disclosed patented technology), the main function of the expanding capsule of the grouting bolt is to form a seat seal as a whole, and the filling of the bottom space depends on the grouting at the bottom of the bolt. At the same time, the bottom grouting can also fill the gap between the capsule and the foundation pit, increasing the integrity and anti-floating effect; In fact, the gripping force between the bolt and the foundation pit is mainly provided by the solidified slurry injected at the bottom. Because the bottom pressure grouting will make the slurry fill the gap between the foundation pit and the formation with a large pressure to form extrusion, and the slurry will seep into the formation and solidify to form a stable gripping force. The capsule is responsible for providing counterweight. However, the capsule with a smooth and regular outer wall after expansion lacks the gripping force with the formation. The foundation pit is separated by the capsule into two relatively independent parts: the slurry column inside the capsule and the foundation column outside the capsule. Therefore, for the bolt, its anti-floating property can only be provided by the counterweight of the slurry column inside the external capsule. Moreover, as time goes by, the problem of the lack of gripping force between the two independent parts will become more obvious after the capsule decays and is damaged; In addition, after the columnar expansion bag is sealed after the slurry solidifies, although 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, the small gap has a high obstacle effect on 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.

[0004] 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

[0005] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. 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 functions, so as to solve the problem proposed in 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.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a reinforced bladder-type expansion grouting anchor with both exhaust and anti-slurry backflow, comprising an anchor body, a first grouting ring cavity opened at the center of the anchor body for receiving external slurry, a needle that is equiangularly hidden and arranged at the upper and lower ends of the anchor body and is driven by the slurry pressure of the first grouting ring cavity to extend adaptively, and an elastic bag that surrounds the outside of the anchor body at an equiangular angle and expands due to the slurry after the needle is fully extended; The lower end of the anchor rod body is provided with a slurry outlet channel which opens adaptively after the needle is fully extended.

[0007] Preferably, a grouting pipe is fixed to the upper end of the anchor body, and a connecting channel which penetrates the grouting pipe is opened at the upper end of the first grouting ring cavity.

[0008] Preferably, the upper and lower ends of the first grouting ring cavity are symmetrically provided with an upper channel and a lower channel for pressurizing the needle grouting at the upper and lower ends.

[0009] 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; Pressure rings are sealingly and slidably arranged inside the two annular pressure chambers.

[0010] 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; The outer wall of the abutting needle is wound with a tightening spring, one end of the tightening spring is welded to the side of the limiting disc, and the other end of the tightening spring is fixed to the inner wall of the limiting groove.

[0011] Preferably, the end of the abutting needle is inserted into the inner part of the annular pressure chamber and is spherical; The surface of the pressure ring close to the abutting needle is arc-shaped, and the arc surface of the pressure ring fits with the spherical end of the abutting needle.

[0012] Preferably, a second grouting ring chamber is opened at the lower end of the anchor rod body, and through holes corresponding to the number of elastic bladder bags are equiangularly opened at the upper end of the second grouting ring chamber; The lower end of the elastic bladder bag is connected to the second grouting ring chamber through the through hole in a penetrating manner, and the elastic bladder bag is fixedly connected to the outer wall of the upper end of the anchor rod body.

[0013] Preferably, a U-shaped connection channel is opened between the side of the second grouting ring chamber and the side wall of the annular pressure chamber; The lower end of the U-shaped connection channel is blocked by the side wall of the pressure ring.

[0014] Preferably, the elastic bladder bag is of a spiral hollow design.

[0015] Preferably, the upper end of the slurry outlet channel is connected to the side of the annular pressure chamber at the lower end in a penetrating manner and is blocked by the side wall of the pressure ring; The lower surface of the anchor rod body is provided with a side through drain groove communicating with the side of the anchor rod body, and the lower end of the slurry outlet channel penetrates through the side through drain groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are: During external grouting, the slurry will enter the two annular pressure chambers at the upper and lower ends of the anchor rod body through the upper channel and the lower channel respectively and push the pressure ring to generate a horizontal extrusion and pushing effect on the spherical end of the abutting needle in contact, so that a number of abutting needles equiangularly distributed at the upper and lower ends of the anchor rod body gradually extend out of the limiting groove, and the gradually extending abutting needles at the upper and lower ends of the anchor rod body will gradually contact the inner wall of the foundation pit. On the one hand, it plays a certain role in centering and guiding the anchor rod body, and on the other hand, it will play a certain role in gripping the ground for the anchor rod body when grouting at the bottom of the anchor rod body to relieve the up-and-down fluctuation phenomenon of the anchor rod body caused by the hydraulic pressure and the reaction force at the bottom of the foundation pit; 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 bladders through the through holes, so that the elastic bladders will gradually expand. When the two adjacent elastic bladders expand, an inclined channel will be left. The slurry injected from the bottom of the anchor body can lift up some broken soil and impurities at the bottom of the foundation pit and pass smoothly through the gap between the two adjacent elastic bladders. 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 dislocation relationship with the elastic bag for 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 gripping force that restrains and limits each other, especially in the vertical direction, to achieve 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 late discharge of gas in the foundation pit due to excessive grouting pressure, further improving the exhaust efficiency of foundation pit grouting.

[0017] After the grouting is completed, since the slurry has not solidified and is still in a fluid state with low resistance at this stage, when the hydraulic pressure is disconnected, the tightening spring will drive the needle to retract inward and reset, so that the 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 outlet 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 effect on the slurry inside the elastic bladder to prevent backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the combined structure of the pulp outlet channel and the side pulp outlet groove of the present invention.

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the anchor rod body after being cut open.

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the anchor rod body and the pressure ring and other parts of the present invention after being completely cut apart.

[0022] Figure 5 For the present invention Figure 4 Enlarged structural diagram at A in the middle.

[0023] Figure 6 For the present invention Figure 4Enlarged schematic diagram of the intercepted main structure of the middle and lower parts.

[0024] Figure 7 Stereoscopic structure diagram of the elastic bladder of the present invention.

[0025] In the figure: 1, anchor rod body; 11, first grouting ring cavity; 12, upper channel; 13, lower channel; 2, grouting pipe; 3, annular pressure cavity; 31, pressure ring; 32, abutting needle; 33, abutting spring; 4, second grouting ring cavity; 5, elastic bladder; 6, slurry outlet channel; 7, side drain slurry groove. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] Please refer to Figures 1 to 7 , the present invention provides a technical solution: a reinforced bladder-type body-expanding grouting anchor rod with exhaust function and anti-slurry-backflow function, including an anchor rod body 1, and further including a first grouting ring cavity 11 opened at the center of the anchor rod body 1 for receiving external slurry, abutting needles 32 that are arranged in an equiangular and hidden manner at the upper and lower ends of the anchor rod body 1 and are driven by the slurry pressure in the first grouting ring cavity 11 to adaptively extend, and an elastic bladder 5 that is arranged around the outside of the anchor rod body 1 and expands after being grouted when the abutting needles 32 are fully extended; The lower end of the anchor rod body 1 is provided with a slurry outlet channel 6 that is adaptively opened after the abutting needles 32 are fully extended.

[0028] As this embodiment, a steel bar hole is opened at the center of the anchor rod body 1 and runs through from top to bottom. Its purpose is to connect the bottom plate of the upper building and the anchor rod in the foundation pit to form a downward pulling force on the bottom plate of the building to achieve the purpose of anti-floating of the building bottom plate. This is the prior art and will not be elaborated in the present invention.

[0029] A grouting pipe 2 is fixed at the upper end of the anchor rod body 1, and a connection channel communicating with the grouting pipe 2 is opened at the upper end of the first grouting ring cavity 11.

[0030] As this embodiment, a threaded interface is provided at the upper end of the grouting pipe 2, which is convenient for connecting with external grouting equipment. At the same time, the grouting pipe 2 is always in a through connection state with the first grouting ring cavity 11 through the connection channel.

[0031] Upper channels 12 and lower channels 13 for grouting and pressurizing the abutting needles 32 at the upper and lower ends are symmetrically opened at the upper and lower ends of the first grouting ring cavity 11.

[0032] In 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 body 1.

[0033] 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; Pressure rings 31 are provided inside the two annular pressure chambers 3 in a sealing and sliding manner.

[0034] As the present embodiment, the pressure ring 31 arranged at the upper end of the anchor rod body 1 is only used to cooperate with a plurality of stop pins 32 at the upper end to realize the extension and retraction of the stop pins 32, while the pressure ring 31 arranged at the lower end of the anchor rod body 1 is not only used to cooperate with a plurality of stop pins 32 at the lower end to realize the extension and retraction of the stop pins 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.

[0035] 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; 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.

[0036] As the present embodiment, during grouting, the needles 32 at the upper and lower ends of the anchor body 1 will be pushed out under the action of the slurry pressure and will be plugged into 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, and on the other hand, the needles 32 distributed at equal angles at the upper and lower ends are simultaneously extended and pressed against the foundation pit wall, which plays a certain degree of centering and guiding role on the anchor body 1. After the grouting is completed, due to the cessation of hydraulic pressure, the needles 32 distributed at equal angles will automatically retract into the interior of the anchor body 1 under the resetting 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.

[0037] The end of the needle 32 is inserted into 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.

[0038] As for the present embodiment, through the fitting contact between the arc 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 respectively, the vertical squeezing 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 squeezing 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.

[0039] 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 bladder bags 5 are formed at equal angles at the upper end of the second grouting annular cavity 4; 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 .

[0040] As for the present embodiment, the elastic bladder 5 which is initially in a deflated state has high material elasticity, so after the slurry is injected into the elastic bladder 5 from the lower end, the elastic bladder 5 will gradually expand to an amount many times that of the initial state. The upper and lower ports 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, and there is almost no air inside, so the influence of the gas is minimal.

[0041] A U-shaped connecting channel is provided between the side edge of the second grouting annular cavity 4 and the side wall of the annular pressure cavity 3; The lower end of the U-shaped connecting channel is blocked by the side wall of the pressure ring 31 .

[0042] 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 bladder 5 through the U-shaped connecting channel, the second grouting ring cavity 4 and the through hole in turn.

[0043] The elastic bag 5 is of spiral hollow design.

[0044] As an embodiment of the present invention, the elastic bladder 5 with a small-angle spiral design is the core inventive point of the present invention. Briefly understood, the elastic bladder 5 in an inclined posture will still maintain the inclined posture after being expanded by grouting, and an inclined channel will be left between two adjacent elastic bladders 5. The slurry grouted from the bottom of the anchor rod 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 two adjacent elastic bladders 5. At the same time, the slurry grouted from the bottom of the anchor rod body 1 can completely fill the inclined channel, and after curing, a misaligned relationship with the height compensation of the elastic bladder 5 can be formed. Compared with the traditional straight cylindrical bladder, the elastic bladder 5 with a small-angle spiral design forms a grasping force that restricts and positions each other with the slurry in the inclined channel. Especially in the vertical direction, a relatively significant anti-floating effect is achieved. In addition, the inclined channel between two adjacent elastic bladders 5 can also prevent the air separation problem caused by incomplete or untimely discharge of the gas in the foundation pit due to excessive grouting pressure setting (air separation will cause large bubbles in the concrete inside the foundation pit. After normal grouting operations, vibration is usually carried out immediately. One of the purposes is to eliminate the remaining air separation inside the slurry and improve the stability after curing. However, due to the ring seal setting of the bladder inside the foundation pit, it is not suitable to use vibration to eliminate air separation, so only the method of reducing the grouting rate and improving the exhaust efficiency can be used to relieve it).

[0045] The upper end and the lower end of the slurry outlet channel 6 are connected through and communicated with the side of the annular pressure chamber 3 and are blocked by the side wall of the pressure ring 31. A side through-discharge slurry groove 7 communicating with the side of the anchor rod body 1 is opened on the lower surface of the anchor rod body 1, and the lower end of the slurry outlet channel 6 penetrates through the side through-discharge slurry groove 7.

[0046] As an embodiment of the present invention, since the anchor rod body 1 will be in contact with the bottom of the foundation pit, if the lower port of the slurry outlet channel 6 directly contacts the bottom of the foundation pit, the anchor rod body 1 will be frequently lifted under the action of the slurry pressure. Therefore, in the present invention, a side through-discharge slurry groove 7 communicating with 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 through-discharge slurry groove 7 and then be stably discharged into the foundation pit through the branch communicating with the side of the anchor rod body 1.

[0047] Working principle: When using the reinforced bladder-type expanding grouting anchor rod with exhaust function and preventing slurry backflow, first place the anchor rod body 1 in the foundation pit that has been drilled and reamed (the specific preparation work can refer to the second paragraph of the background technology), so that it is in a relatively centered position. Subsequently, connect the external grouting equipment port through the grouting pipe 2 to form a through connection with the inside of the anchor rod body 1, and start stable grouting.

[0048] Refer to Appendix Figure 3 and Appendix Figure 4, the pressured grout entering through the grouting pipe 2 will be stably conveyed through the connecting channel to the first grouting ring cavity 11 in the middle of the anchor rod body 1, and then distributed from the first grouting ring cavity 11 into the symmetrically arranged upper channel 12 and lower channel 13. The grout will enter the two annular pressure cavities 3 at the upper and lower ends of the anchor rod body 1 respectively from the upper channel 12 and the lower channel 13 and exert an extrusion and pushing effect on the pressure ring 31, causing the pressure ring 31 to move stably along the inner wall of the annular pressure cavity 3 and exert a horizontal extrusion and pushing effect on the spherical end of the abutting needle 32 in contact through its arc surface (where the transmission of pressure is embodied in the form of hydraulic pressure, so the extrusion force on the pressure ring 31 will be relatively dispersed and equalized). As a result, several abutting needles 32 equally distributed at the upper and lower ends of the anchor rod body 1 gradually extend out of the limiting grooves and compress the corresponding abutting springs 33. The abutting needles 32 gradually extending at the upper and lower ends of the anchor rod body 1 will gradually contact the inner wall of the foundation pit. On the one hand, it plays a certain role in centering and guiding the anchor rod body 1, and on the other hand, it plays a certain role in gripping the ground for the anchor rod body 1 when grouting at the bottom of the anchor rod body 1, thus facilitating the alleviation of the up-and-down fluctuation phenomenon of the anchor rod body 1 caused by the hydraulic pressure and the reaction at the bottom of the foundation pit; Immediately afterwards, as shown in the Figure 6 attachment. As the lower pressure ring 31 gradually descends and the abutting needles 32 gradually extend, the side wall of the pressure ring 31 gradually crosses 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 exactly synchronously exposed in the grouting area inside the lower annular pressure cavity 3. At this time, the upper channel 12 is saturated, and the injected grout is only injected into the lower annular pressure cavity 3 through the lower channel 13, and then simultaneously 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 grout entering the second grouting ring cavity 4 will be equalized and evenly distributed into the corresponding elastic sacs 5 through the through holes, causing the elastic sacs 5 to gradually expand. At the same time, an inclined channel (actually in a small-angle spiral shape, and the description of the inclined channel is only for easy understanding) will be left between two adjacent elastic sacs 5. The grout grouted from the bottom of the anchor rod body 1 can lift some crushed soil and impurities at the bottom of the foundation pit and smoothly discharge them to the surface through the inclined channel between two adjacent elastic sacs 5. At the same time, the grout grouted from the bottom of the anchor rod body 1 can completely fill the inclined channel, and after curing, it can form a misaligned relationship with the height compensation of the elastic sacs 5. Compared with the traditional straight cylindrical sacs, the elastic sacs 5 designed with a small-angle spiral form a mutual restraint and mutual limiting gripping force with the slurry in the inclined channel. Especially in the vertical direction, a relatively significant anti-floating effect is achieved, and the inclined channel between two adjacent elastic sacs 5 can also prevent the air separation problem caused by incomplete or untimely discharge of the gas in the foundation pit due to too large grouting pressure setting, further improving the grouting exhaust efficiency of the foundation pit.

[0049] Finally, after the grouting is completed, since the grout is still in a fluid state and has a small resistance at this stage, when the hydraulic pressure is disconnected, the abutting spring 33 will drive the abutting needle 32 to retract inward and reset, so that several abutting needles 32 evenly distributed at the upper and lower ends of the anchor rod body 1 are retracted into the annular pressure chamber 3 in the anchor rod body 1, and the pressure ring 31 is pushed back to the initial position to form a re-sealing of the slurry inlet 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 at the same time also plays a role in locking the slurry inside the elastic bladder 5 to prevent backflow.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A reinforced capsule - type body - expanding grouting anchor rod with exhaust function and preventing slurry back - flow, comprising an anchor rod body (1), characterized in that: It also includes a first grouting annular cavity (11) opened at the center of the anchor body (1) for receiving external grout, a needle (32) equiangularly hidden and arranged at the upper and lower ends of the anchor body (1) and driven by the grout pressure of the first grouting annular cavity (11) to extend adaptively, and an elastic bag (5) equiangularly surrounding the outside of the anchor body (1) and expanding due to the grout after the needle (32) is fully extended. The side wall of the anchor rod body (1) is provided with a limit groove through which the needle (32) can be extended and slid, and a limit plate is fixed to the outer wall of the needle (32) located in the limit groove, and the end of the needle (32) is inserted into the inside of the annular pressure chamber (3) and is spherical. Pressure rings (31) are symmetrically arranged inside the upper and lower ends of the anchor rod body (1), and 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 slurry outlet channel (6) which opens adaptively after the needle (32) is fully extended.

2. The reinforced capsule - type body - expanding grouting bolt with exhaust function and anti - slurry back - flow according to claim 1, characterized in that: 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 provided at the upper end of the first grouting annular cavity (11).

3. An enhanced capsule-type expanding body grouting bolt with exhaust function and anti-slurry backflow function according to claim 1, characterized in that: An upper channel (12) and a lower channel (13) are symmetrically provided at the upper and lower ends of the first grouting ring cavity (11) for pressurizing the grouting of the needles (32) at the upper and lower ends.

4. The reinforced capsule - type body - expanding grouting anchor rod with exhaust function and anti - slurry back - flow according to claim 3, characterized in that: 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); The two pressure rings (31) are respectively arranged in a sliding and sealing manner inside the two annular pressure chambers (3).

5. An enhanced capsule-expanded grouting bolt with exhaust function and preventing slurry backflow according to claim 4, characterized in that: 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.

6. The reinforced bladder-type body-expanding grouting bolt with exhaust function and anti-slurry backflow according to claim 4, characterized in that: The lower end of the anchor 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).

7. An enhanced capsule - type body - expanding grouting bolt with exhaust function and preventing slurry back - flow according to claim 6, characterized in that: A U-shaped connecting channel is provided between the side edge of the second grouting annular cavity (4) and the side wall of the annular pressure cavity (3); The lower end of the U-shaped connecting channel is blocked by the side wall of the pressure ring (31).

8. An enhanced capsule-type body-expanding grouting anchor rod with exhaust function and preventing slurry backflow according to claim 6, characterized in that: The elastic bladder (5) is of a spiral hollow design.

9. The reinforced capsule - type expanding grouting bolt with exhaust function and anti - slurry backflow according to claim 1, characterized in that: The upper end of the slurry outlet channel (6) is connected to the side of the annular pressure chamber (3) located at the lower end and is blocked by the side wall of the pressure ring (31); The lower surface of the anchor body (1) is provided with a side slurry discharge groove (7) which is in communication with the side edge 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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