Cage core bag for anchor rod and bag anchor rod

Abstract

The present invention provides a bag anchor rod and a cage core bag, the cage core bag comprises a cage core and a bag sleeved on the cage core, the bag is provided with at least one upper opening; the cage core is a hollow cylindrical structure that is permeable to grouting, the cage core is provided with an upper port for the anchor rod body to penetrate; the periphery of the upper opening of the bag is sealed and connected with the periphery of the upper port of the cage core. The rod body penetrates or passes through the hollow of the cage core; an upper plug is provided at the hollow upper port of the cage core to close the upper port of the cage core, and the upper plug fixes the cage core bag on the rod body; the upper plug is provided with a grouting hole for connecting a grouting pipe or inserting a grouting pipe to grout into the cage core bag. The cement slurry in the cage core is subjected to greater pressure after solidification, and is denser after solidification, which can greatly improve the stress state of the cement slurry and greatly increase its strength; in addition, the rod body is directly in contact with the cement slurry and bonded, the frictional resistance is greatly increased, and the performance of resisting groundwater erosion is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of anchor rods, and in particular to a cage core bag for an anchor rod and a bag anchor rod. Background Art

[0002] There are two main types of bag anchors in the prior art, one of which is Figure 1 As shown, the upper opening 21 and the lower opening 22 of the bag 2 are directly bound to the rod body 3 through the throat clamp 4. The advantage of this form is that the rod body 3 is bonded to the cement slurry 7 in the bag 2, the rod body 3 is isolated from the corrosive groundwater, and the anti-corrosion effect is good. The disadvantage is that the on-site installation is more troublesome, the length of the bag 2 may change because the throat clamp 4 may slide along the anchor rod body 3, the friction resistance between the rod body 3 and the cement slurry 7 is not large enough, and the required length of the bag 2 is relatively large; the bag 2 is sometimes attached to and wrapped around the rod body 3, such as Figure 2 As shown, sometimes the rod body will deviate from the center of the anchor hole 20 and fit with the bladder 2, affecting the bonding with the cement slurry 7. Figure 3 As shown, it is not reliable enough. Figure 4 As shown, a steel pipe 8 is added between the rod body 3 and the bag 2, the upper mouth 21 and the lower mouth 22 of the bag 2 are bound to the steel pipe 8 through the throat clamp 4, and a nut 9 is provided at the bottom end of the rod body 3 to transmit the tension between the rod body 3 and the steel pipe 8. The advantage of this form is that it is convenient to assemble on site. The disadvantage is that the cement slurry 7 is not bonded to the rod body 3, and the tension of the rod body 3 is mainly concentrated at the bottom nut 9, where the stress is concentrated and the maximum tension provided is small. In addition, there is a relative deformation between the rod body 3 and the steel pipe 8, and corrosive groundwater can enter the steel pipe 8 and contact with the rod body 3, resulting in poor anti-corrosion effect, which needs to be improved. Summary of the invention

[0003] The object of the present invention is to provide a cage core bag for an anchor rod and a bag anchor rod which are easy to assemble on site, have good anti-corrosion effect, high strength and high reliability.

[0004] The present invention is implemented as follows: a cage core bag for an anchor rod, comprising a cage core and a bag sleeved on the cage core, the bag being a closed bag surrounded by a flexible sheet material that is impermeable to slurry or weakly permeable to slurry, but having at least one upper opening; the cage core is a hollow cylindrical structure that is permeable to slurry, and the hollow part of the cage core is provided with at least one upper port for the anchor rod body to penetrate; the periphery of the upper opening of the bag is sealed and connected to the periphery of the upper port of the cage core.

[0005] Wherein, the hollow part of the cage core is also provided with a lower port for the anchor rod body to pass through.

[0006] Wherein, the bag is also provided with a lower opening, and the periphery of the lower opening is sealed and connected with the periphery of the lower port of the cage core.

[0007] Part or all of the cage core side wall is a wire mesh; or the cage core side wall is a plate with dense grouting holes and the area of ​​the grouting holes accounts for more than half of the plate area; or the cage core side wall is a steel cage surrounded by longitudinal steel bars and annular steel bars.

[0008] Wherein, the upper end of the hollow part of the cage core is a metal cylinder, a metal ring, or a plate with holes.

[0009] Wherein, the inner diameter of the hollow part of the cage core is greater than 2 times the diameter of the anchor rod body but less than 7 times the diameter of the anchor rod body.

[0010] The peripheral sealing connection of the upper opening of the bag to the peripheral upper port of the hollow part of the cage core is carried out by: bonding with an adhesive, tightening with a throat hoop, pressing with a sleeve, or folding the edge of the upper opening of the bag back to cover the edge of the upper port of the cage core and then sewing or gluing.

[0011] The present invention also provides a bag anchor rod, comprising a rod body and the cage core bag described above, wherein the rod body penetrates or passes through the hollow part of the cage core; an upper plug is provided at the upper port of the hollow part of the cage core to close the upper port of the cage core, and the upper plug fixes the cage core bag on the rod body; the upper plug is provided with a grouting hole for connecting a grouting pipe or inserting a grouting pipe to grout into the cage core bag.

[0012] Among them, the hollow part of the cage core is also provided with a lower port for the anchor rod body to pass through, and the bag is also provided with a lower port, the periphery of the lower port is sealed and connected to the periphery of the lower port of the cage core, and a lower plug is provided at the lower port of the cage core, the rod body is a threaded steel bar, and the upper plug and the lower plug are sealing plates respectively containing internal threaded holes and larger than the upper port and the lower port of the hollow part of the cage core, and the internal threaded holes are connected to the rod body by threads, and the upper plug and the lower plug are respectively rotated downward and upward to press the upper port and the lower port of the cage core, so as to close the upper port and the lower port, and fix the cage core bag on the rod body.

[0013] Among them, the hollow part of the cage core is also provided with a lower port for the anchor rod body to pass through, and the bag is also provided with a lower port, the periphery of the lower port is sealed and connected with the periphery of the lower port of the cage core, and a lower plug is provided at the lower port of the cage core. The rod body is a steel bar, a steel strand or a glass fiber reinforced plastic rod, and dry hemp silk, sponge or curing agent are blocked at the upper port and the lower port of the cage core to form the upper and lower plugs.

[0014] The beneficial effects of the present invention are as follows: during construction, the bag anchor rod of the present invention is grouted into the cage core and the bag through the grouting pipe. The bag is used to prevent the cement slurry from spreading everywhere and being unable to solidify into one. The side wall of the cage core is provided with a grout-permeable structure or grout-permeable material, so that the cement slurry in the bag and the cage core can achieve two-way flow. The upper plugging is used to prevent the slurry from leaking from the upper end of the cage core. The cage core is located between the rod body and the bag, which completely avoids the situation where the bag is attached to and wrapped around the rod body. The cement slurry in the cage core and the bag is integrated. After the cement slurry in the cage core is solidified, the stress state of the cement slurry can be greatly improved due to the existence of the cage core, and its strength is greatly improved; the rod body is protected by the cage core and the cement slurry inside it, which effectively improves the performance of resisting groundwater erosion. The cage core and the bag can be assembled first and then transported to the construction site, which can reduce the workload of on-site construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a form of bag anchor in the prior art;

[0016] Figure 2 yes Figure 1 Schematic diagram of the cross section of the middle bag anchor rod with poor wrapping;

[0017] Figure 3 yes Figure 1 Schematic diagram of the cross section of the middle bag anchor rod not being centered and resulting in poor deviation;

[0018] Figure 4 It is a schematic diagram of the structure of another form of bag anchor in the prior art;

[0019] Figure 5 is a schematic structural diagram of a first embodiment of the bag anchor rod of the present invention;

[0020] Figure 6 It is a schematic structural diagram of the cage core bag in the first embodiment of the bag anchor rod of the present invention;

[0021] Figure 7 It is a structural schematic diagram of the cage core in the first embodiment of the bag anchor rod of the present invention;

[0022] Figure 8 It is a structural schematic diagram of the upper plugging in the first embodiment of the bag anchor rod of the present invention;

[0023] Fig. 9 is a schematic structural diagram of a second embodiment of the bag anchor rod of the present invention;

[0024] Fig.10 This is a schematic structural diagram of a second embodiment of the cage core bag of the present invention;

[0025] Fig.11 This is a schematic structural diagram of a third embodiment of the cage core bag of the present invention;

[0026] Fig.12 is a schematic structural diagram of a third embodiment of the bag anchor rod of the present invention;

[0027] Fig.13 is a schematic structural diagram of a fourth embodiment of the bag anchor rod of the present invention;

[0028] Fig.14 is a schematic structural diagram of a fifth embodiment of the bag anchor rod of the present invention;

[0029] Fig.15 It is a schematic structural diagram of the sixth embodiment of the bag anchor rod of the present invention.

[0030] in:

[0031] 1. Cage core; 11. Upper port; 12. Lower port; 13. Metal cylinder; 14. Steel wire mesh; 15. Slurry penetration hole;

[0032] 2, pouch; 21, upper opening; 22, lower opening;

[0033] 3. Rod body;

[0034] 4. Hose clamp;

[0035] 5. Upper plugging; 51. Rod body perforation; 52. Grouting hole; 53. Positioning groove;

[0036] 6. Lower plugging; 61. Rod body perforation; 62. Positioning groove;

[0037] 7. Cement slurry; 8. Steel pipe; 9. Nut; 10. Grouting pipe;

[0038] 20. Anchor hole; 24. Exhaust pipe. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it may be directly on the other component or there may be an intermediate component at the same time. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component at the same time.

[0041] It should also be noted that the directional terms such as "upper", "lower", "left", "right", "inside", "outside", "upper end", "lower end" or "bottom end" in the embodiments of the present invention are only relative concepts or are referenced to the normal use state of the product, or are referenced based on the positions shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be considered to be restrictive.

[0042] As an embodiment 1 of the cage core bag and bag anchor rod of the present invention, Figures 5 to 8 As shown, the bag anchor includes a rod body 3 and a cage core bag, the cage core bag includes a cage core 1 and a bag 2 sleeved on the cage core 1, the bag 2 is a closed bag surrounded by a flexible sheet material that is impermeable to grout or weakly permeable to grout, but has at least one upper opening 21; the cage core 1 is a cylindrical structure with a hollow part and a side wall permeable to grout, and the hollow part of the cage core 1 is provided with at least one upper port 11 for the anchor rod body 3 to penetrate; the periphery of the upper opening 21 of the bag 2 is sealed and connected with the periphery of the upper port 11 of the cage core 1. The rod body 3 penetrates or passes through the hollow part of the cage core 1; an upper plug 5 is provided at the upper port H of the hollow part of the cage core 1 to close the upper port 11 of the cage core 1, and the upper plug 5 simultaneously fixes the cage core bag on the rod body 3; the upper plug 5 is provided with a grouting hole 52 for connecting a grouting pipe 10 or inserting a grouting pipe 10 to grout into the cage core bag.

[0043] In fact, the grouting pipe 10 can be inserted from the upper port 11 of the cage core 1, or the grouting pipe is directly inserted into the bag, or includes two grouting pipes, one grouting pipe is inserted from the upper port of the cage core, and the other grouting pipe is directly inserted into the bag. The main reason for setting two grouting pipes is to prevent pipe blockage and improve reliability. There are many ways to fix the grouting pipe on the cage core bag, such as providing a grouting threaded hole on the upper plug, and providing an external thread at the tail of the grouting pipe, which is fixed in the grouting threaded hole by threaded connection; or providing a grouting through hole on the upper plug, and the grouting pipe is inserted into the cage core bag through the through hole and fixed at the grouting through hole with an adhesive.

[0044] In this embodiment, the periphery of the upper opening of the sac bag is sealed and connected to the periphery of the upper port of the hollow part of the cage core by: bonding with an adhesive, tightening with a throat clamp 4, pressing with a sleeve, or folding the edge of the upper opening of the sac bag back to cover the edge of the upper port of the cage core and then sewing or gluing.

[0045] In this embodiment, the inner diameter of the hollow part of the cage core 1 is greater than 2 times the diameter of the anchor rod body 3 but less than 7 times the diameter of the anchor rod body 3. The thickness of the cement slurry in the cage core 1 cannot be too thin, and the inner diameter of the hollow part of the cage core 1 should be greater than 2 times the diameter of the rod body 3; if it is too large, it will increase the difficulty of construction, making it difficult to put it into the anchor hole, and it will also increase the material cost, and the confining pressure effect of the cage core on the cement slurry grouting body inside it will not increase linearly with the increase of diameter, so the inner diameter of the hollow part of the cage core 1 is preferably less than 7 times the diameter of the anchor rod body 3. If it exceeds 7 times, the technical and economic effects are low.

[0046] In this embodiment, the hollow part of the cage core 1 is also provided with a lower port 12 for the anchor rod body 3 to pass through. The bag 2 is also provided with a lower port 22, and the periphery of the lower port 22 is sealed and connected to the periphery of the lower port 12 of the cage core 1. The specific method of adoption can be consistent with the upper port of the bag, which will not be repeated here. A lower plug 6 is provided at the lower port 12 of the cage core 1, the rod body 3 is a threaded steel bar, and the upper plug 5 and the lower plug 6 are sealing plates respectively containing internal threaded holes and larger than the upper port 11 and the lower port 12 of the hollow part of the cage core 1. The internal threaded holes are connected to the rod body 3 by threads, and the upper plug 5 and the lower plug 6 are respectively rotated downward and upward to press the upper port 11 and the lower port 12 of the cage core 1, so as to close the upper port 11 and the lower port 12, and fix the cage core bag on the rod body 3. On-site installation is very convenient, and the adjustment of the threaded connection position is also very easy.

[0047] In this embodiment, the cage core 1 is a metal cylinder, and a plurality of grouting holes 15 are provided on the side wall of the cage core 1. The size and number of the grouting holes 15 should ensure the free flow of cement slurry 7 between the cage core 1 and the bag 2 in both directions and ensure that the inside and outside of the cage core can form a whole after the cement slurry solidifies. Different slurries, such as cement slurry, cement mortar, and concrete slurry, require targeted design of the grouting holes 15. In theory, the grouting holes should be densely and evenly distributed, and the area of ​​the grouting holes should account for more than half of the side area of ​​the cage core.

[0048] As another embodiment of the cage core, Figure 7 As shown, part or all of the side wall of the cage core 1 is a steel wire mesh 14, which is a grout-permeable material, and the clearance size of different numbers of mesh holes can be greater than twice the maximum aggregate size of the cement slurry.

[0049] In another embodiment of the cage core, the side walls of the cage core are formed into a steel cage by longitudinal steel bars and annular steel bars, which can also achieve substantially the same purpose and beneficial effects of the invention.

[0050] In order to better fix the upper and lower seals, and fix the upper and lower openings of the bag, the upper and lower openings of the cage core are preferably a section of metal tube 13, a metal ring, a plastic tube or a steel plate with holes.

[0051] During construction, the bag anchor rod of the present invention is grouted into the cage core 1 and the bag 2 through the grouting pipe 10. The bag 2 is used to prevent the cement slurry 7 from diffusing outward and concentrate the cement slurry 7 in the bag 2. The side wall of the cage core 1 is provided with a grout-permeable structure or grout-permeable material, so that the cement slurry 7 in the bag 2 and the cage core 1 can flow in both directions and form a whole after solidification. The upper plug 5 is used to prevent the upper end of the cage core 1 from leaking. The cage core 1 is located between the rod body 3 and the bag 2, which completely avoids the situation that the bag 2 is attached to and wrapped around the rod body 3. The cement slurry 7 in the cage core 1 and the bag 2 become one body, a reinforced cement slurry grouting body with the rod body 3 as the center and the cage core 1 as the ribs, whose mechanical strength is greatly improved than that of the plain cement slurry grouting body, and its bonding force and friction resistance with the rod body 3 are greatly improved. The rod body 3 is protected by the cage core 1 and the cement slurry 7 inside it, which effectively improves the performance of resisting groundwater erosion. The cage core 1 and the bag 2 can be assembled first and then transported to the construction site for use as a whole. Since the production conditions of factory processing and assembly are better than those at the construction site, the cost is low, the quality is good, and the reliability is high. Therefore, compared with some existing bags that need to be assembled at the construction site, the present application does not need to be assembled at the construction site, and has the advantages of low cost, good quality, and high reliability.

[0052] The bag is combined with the cage core into a whole to form a cage core bag for anchor rods, which overcomes the shortcomings of the bag and the cage core when used alone, and has new advantages generated by the combination of the two. When the cage core is used alone, the cage core sleeve is installed on the anchor rod body and put into the anchor hole. Due to the mud produced by drilling in the anchor hole, the hole wall bulges and fallen mud blocks, these mud, mud, mud blocks, etc. may enter the cage core and contact the anchor rod body, affecting the solidification and bonding of the rod body and cement slurry, and affecting the mechanical strength of the cement slurry grouting body. The mud, mud, and mud blocks that enter the cage core are not easy to be removed and cleaned due to the enclosure effect of the cage core. Therefore, the side effect of using the cage core alone is very large, and it is better not to use it. The cage core of the present application is combined with the bag, and the bag completely blocks the mud, mud, mud blocks, etc. that are harmful to the solidification of cement slurry from entering the cage core, completely overcoming the side effect of using the cage core alone, and can give full play to the beneficial effects and effects of the cage core. When the bag is used alone, it is easy for the bag to be attached to or wrapped around the rod at one part or one side (such as Figure 2 As shown in FIG. 1 , since the pressure of the cement slurry in the bag and the mud outside the bag is roughly balanced, the cement slurry in the bag sometimes cannot expand the bag cloth away from the rod body. Figure 3As shown, when the rod body is against the wall of the anchor hole 20, the bag will always be attached to the rod body. Therefore, when the bag is used alone, the bag is easy to stick to or wrap around the anchor rod body, causing the rod body to lose or partially lose adhesion with the cement slurry grouting body, affecting the mechanical properties of the anchor rod, and having great side effects. In order to overcome this side effect, thicker geotextiles and plastic cloths that are not very soft are often used in engineering, but the thicker cloth occupies a larger anchor hole space and can only be used for anchor rods with larger anchor hole diameters. The present application combines the cage core with the bag, completely overcoming the shortcomings and side effects of using the bag alone, completely avoiding the possibility of the bag cloth sticking to or wrapping around the rod body, ensuring that the rod body is fully and fully bonded to the cement slurry, and fully and reliably exerting the beneficial effects and effects of the bag, and the cage core and the bag of the present application are combined, so that the bag can be made of thinner cloth, which occupies less space and can be used for anchor rods with smaller anchor hole diameters, expanding the scope of use of the bag anchor rod and having low cost.

[0053] The cage core is combined with the bladder bag. The cage core effectively prevents the bladder cloth from sticking to and wrapping around the rod body. The bladder bag effectively prevents soil and mud from entering the cage core and preventing the cement slurry from being diluted by groundwater. The cement slurry entering the cage core is a pure slurry with a controllable water-cement ratio, which avoids the mixing and dilution of water, soil and mud in the anchor hole. This ensures the formation of a reinforced cement slurry grouting body with the rod body as the center and the cage core as the outer skeleton, which is formed by the solidification of pure cement slurry with a controllable water-cement ratio. As we all know, just as the mechanical strength of reinforced concrete is generally several times higher than that of plain concrete, the mechanical strength of reinforced cement slurry grouting is also several times higher than that of plain cement slurry grouting. The bonding strength between the rod body and the cement slurry grouting body is also several times higher. Therefore, the combination of the cage core and the bladder bag can greatly improve the mechanical strength of the anchor rod and greatly improve its reliability.

[0054] As the second embodiment of the cage core bag of the present invention, Fig.10 As shown, the difference from the first embodiment is that the cage core 1 has only an upper port 11, and the lower port itself is closed, so there is no need to add an additional lower plug.

[0055] As the third embodiment of the cage core bag of the present invention, Fig.11 As shown, the difference from the first embodiment is that the cage core has an upper port 11 and a lower port 12, but the bag 2 also has only an upper port, and the lower end of the bag 2 wraps around the cage core lower port 12 and is fixed to the lower end of the cage core 1 through the throat clamp 4.

[0056] As a second embodiment of the bag anchor rod of the present invention, Fig. 9 As shown, the difference from the first embodiment is that the structure of the lower plug 6 is different. The lower plug 6 is cup-shaped, and the lower port of the cage core 1 is provided with an external thread. The lower plug 6 is connected to the lower port of the cage core 1 through a thread, and can also play a plugging role.

[0057] As the third embodiment of the bag anchor rod of the present invention, Fig.12 As shown, the upper port 11 and the lower port 12 of the cage core 1 are steel cylinders. The difference from the first embodiment is that the upper plug 5 and the lower plug 6 are not prefabricated accessories with a fixed shape, but dry hemp silk, sponge or curing agent are filled in the upper port 11 and the lower port 12 of the cage core 1 to form the upper plug 5 and the lower plug 6 to close the upper port 11 and the lower port 12. The rod body 3 can be various forms such as steel bars, steel strands or glass fiber reinforced plastic rods.

[0058] As a fourth embodiment of the bag anchor rod of the present invention, Fig.13 As shown, the difference from Example 1 is that the upper plug 5 and the lower plug 6 are provided with internal thread holes matching the external threads of the rod body 3 at the center positions, and the upper plug 5 and the lower plug 6 are also provided with positioning grooves 53, 62, and the upper port 11 and the lower port 12 of the cage core 1 are inserted into the positioning grooves 53, 62, so that the rod body 3 and the cage core 1 are relatively centered, ensuring that the cement slurry thickness around the rod body 3 is uniform, the force is balanced, and it is more stable and reliable.

[0059] As a fifth embodiment of the bag anchor rod of the present invention, Fig.14 As shown, the difference from the first embodiment is that the cage core 1 is provided with an upper port 11 and a lower port 12, and is also provided with an upper plug 5 and a lower plug 6, but the bag 2 has only an upper opening 21, and the lower end of the bag 2 is in a suspended state.

[0060] As a sixth embodiment of the bag anchor rod of the present invention, Fig.15 As shown, the difference from the first embodiment is that the cage core 1 is provided with an upper port 11, the lower end is a closed structure, and is provided with a through hole, and the rod body is screwed into the through hole, but the bag 2 has only an upper port 21, and the lower end of the bag 2 is fixed to the rod body 3 through a throat clamp 4.

[0061] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cage core bag for an anchor rod, characterized in that: The invention comprises a cage core and a bag sleeved on the cage core, wherein the bag is a closed bag surrounded by a flexible sheet material that is impermeable to slurry or weakly permeable to slurry, but has at least one upper opening; the cage core is a hollow cylindrical structure that is permeable to slurry, the inner diameter of the hollow part of the cage core is greater than 2 times the diameter of the anchor rod body but less than 7 times the diameter of the anchor rod body, the side wall of the cage core is a wire mesh, or the side wall of the cage core is a steel cage surrounded by longitudinal steel bars and annular steel bars; the hollow part of the cage core is at least provided with an upper port for the anchor rod body to penetrate, and the upper port is a section of metal tube, metal ring, or a plate with holes; the periphery of the upper opening of the sac bag is sealed and connected to the periphery of the upper port of the cage core; the upper port of the hollow part of the cage core is provided with an upper plug to close the upper port of the cage core, and the upper plug simultaneously fixes the sac bag on the rod body; the upper plug is provided with a grouting hole, and the grouting hole is used to connect a grouting pipe or insert a grouting pipe to grout into the sac bag; the hollow part of the cage core is also provided with a lower port for the anchor rod body to pass through; the sac bag is also provided with a lower opening, and the periphery of the lower opening is sealed and connected to the periphery of the lower port of the cage core.

2. The anchor rod cage core bag according to claim 1, characterized in that: The periphery of the upper opening of the sac bag is sealed and connected to the periphery of the upper port of the hollow part of the cage core by: bonding with an adhesive, tightening with a throat hoop, pressing with a sleeve, or folding the edge of the upper opening of the sac bag back to cover the edge of the upper port of the cage core and then sewing or bonding.

3. A bag anchor, characterized in that: It comprises a rod body and the cage core bag as claimed in claim 1 or 2.

4. The bag anchor rod according to claim 3, characterized in that: A lower plug is provided at the lower port of the cage core, the rod body is a threaded steel bar, the upper plug and the lower plug are sealing plates respectively containing internal threaded holes and larger than the upper port and the lower port of the hollow part of the cage core, the internal threaded holes are connected to the rod body by threads, the upper plug and the lower plug are respectively rotated downward and upward to press the upper port and the lower port of the cage core, so as to close the upper port and the lower port, and fix the cage core bag on the rod body.

5. The bag anchor rod according to claim 3, characterized in that: A lower plug is provided at the lower port of the cage core, the rod body is a steel bar, a steel strand or a glass fiber reinforced plastic rod, and dry hemp silk, sponge or curing agent is plugged at the upper and lower ports of the cage core to form the upper and lower plugs.

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