Multi-corrosion-proof anchor rod with exhaust pressure stabilizing member and construction method

Abstract

The application discloses a multiple anticorrosion anchor rod with an exhaust pressure stabilizing component and a construction method, and relates to the technical field of anchor rods.The multiple anticorrosion anchor rod with the exhaust pressure stabilizing component comprises an anchor rod body, an exhaust pressure stabilizing component and a corrugated pipe.The anchor rod body has a hole-entering section arranged in an anchor hole and a showing section exposed to the anchor hole.The exhaust pressure stabilizing component comprises a hollow inner connecting rod.The inner connecting rod is sleeved on the hole-entering section and comprises a first connecting rod section and an exhaust rod section.The outer connecting sleeve is sleeved on the exhaust rod section.An annular limiting step is arranged between the first connecting rod section and the exhaust rod section.The corrugated pipe is sleeved on the first connecting rod section and abuts against the annular limiting step.The outer connecting sleeve can slide and deform along the direction of the hole-entering section towards the showing section to seal the first exhaust gap and / or the second exhaust gap.The application effectively improves the grouting compactness of the anchor hole, thereby improving the construction quality.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering technology, and in particular to a multi-layer anti-corrosion anchor bolt with a venting and pressure stabilizing component and its construction method. Background Technology

[0002] Rock bolt support is widely used in underground caverns such as traffic tunnels and hydraulic tunnels, and is one of the main support measures for tunnels designed according to the "New Austrian Tunneling Method" (NATM). Multi-layered anti-corrosion rock bolts offer multiple protective measures to prevent corrosion and have broad application prospects. They are a widely used support type for tunnels in chloride-corrosion environments.

[0003] As the requirements for the quality of tunnel construction become increasingly stringent, the construction quality of anchor bolts has gradually gained attention. Currently, multi-layered anti-corrosion anchor bolts do not have the functions of air release and grout stop and pressure stabilization, which cannot guarantee the anchoring quality of the anchor bolts and therefore cannot fully exert the support performance of the anchor bolts. Summary of the Invention

[0004] The main objective of this invention is to provide a multi-layer anti-corrosion anchor bolt with an exhaust and pressure stabilizing component and a construction method thereon, which can effectively improve the grouting density of the anchor hole and thus improve the construction quality of the anchor bolt.

[0005] To achieve the above objectives, the present invention proposes a multi-layered anti-corrosion anchor bolt with an exhaust and pressure stabilizing component, comprising:

[0006] An anchor bolt body having an insertion section for placement in an anchor hole and an exposed section that exposes the anchor hole;

[0007] An exhaust pressure stabilizing component includes a hollow inner connecting rod sleeved on the inlet section. In the direction from the inlet section toward the exposed section, the inner connecting rod includes a first connecting rod segment and an exhaust rod segment. An outer connecting sleeve is sleeved on the exhaust rod segment. An annular limiting step is provided between the first connecting rod segment and the exhaust rod segment.

[0008] A corrugated pipe is fitted onto the first connecting rod segment and abuts against the annular limiting step;

[0009] Under the thrust of the grout in the anchor hole, the outer connecting sleeve can slide and deform along the direction of the inlet section toward the exposed section to seal the first venting gap formed between the inner connecting rod and the outer connecting sleeve and / or the second venting gap formed between the outer connecting sleeve and the inner wall of the anchor hole.

[0010] Optionally, the outer side of the exhaust rod segment is provided with a venting groove, the venting groove extends along the length direction of the exhaust rod segment, and the first exhaust gap includes the venting groove.

[0011] Optionally, multiple ventilation slots are provided and spaced apart circumferentially along the exhaust rod segment; and / or,

[0012] The radius of curvature of the cross-section of the vent groove gradually decreases from the direction of the inlet section toward the exposed section.

[0013] Optionally, at least a portion of the outer surface of the exhaust rod segment is tapered, and the outer diameter of the exhaust rod segment is increased in the direction from the inlet segment to the exposed segment. Correspondingly, the inner wall surface of the outer connecting sleeve is adapted to the outer surface of the exhaust rod segment and is tapered.

[0014] Optionally, the exhaust rod section includes a tapered section and a cylindrical section connecting the small end of the tapered section, the annular limiting step is formed on the cylindrical section and the first connecting rod section, and the outer diameter of the cylindrical section is smaller than the outer diameter of the small end of the tapered section;

[0015] The outer connecting sleeve is fitted over the tapered section and the cylindrical section.

[0016] Optionally, the outer connecting sleeve is made of rubber, and the rubber hardness is 40HA to 65HA; and / or,

[0017] The end face of the outer connecting sleeve facing away from the exposed section is perpendicular to the inner wall surface of the outer connecting sleeve, and the angle between the outer connecting sleeve and the radial plane of the outer connecting sleeve is α, where 4°≤α≤6°; and / or,

[0018] The outer side of the first connecting rod segment is provided with a first spiral groove, which is fitted and installed in conjunction with a first threaded protrusion provided on the inner wall of the bellows.

[0019] Optionally, the inner connecting rod further includes a second connecting rod segment, the second connecting rod being disposed on the side of the exhaust rod segment away from the first connecting rod segment;

[0020] The multi-layer anti-corrosion anchor rod with exhaust pressure stabilizing component also includes a grouting rod. The grouting rod is hollow and includes a transition connecting pipe and a bladder. The bladder is sleeved on the exposed section and has a grout inlet. One end of the transition connecting pipe is connected to the bladder and the other end is connected to the second connecting rod section.

[0021] Optionally, the multi-layer anti-corrosion anchor bolt with exhaust and pressure stabilizing components further includes a pad cover, which is fitted over the outer part of the bladder to support the bladder and seal the anchor hole. The pad cover also has an exhaust hole; and / or,

[0022] The multi-layered anti-corrosion anchor bolt with exhaust and pressure stabilizing components also includes a spherical nut, which is connected to the exposed section and abuts against the bladder body; and / or,

[0023] The outer side of the second connecting rod segment is provided with a second spiral groove, which is fitted and installed in conjunction with a second threaded protrusion provided on the inner wall of the transition connecting pipe.

[0024] The present invention also provides a construction method for a multi-layer anti-corrosion anchor with an exhaust pressure stabilizing component. The multi-layer anti-corrosion anchor with an exhaust pressure stabilizing component includes an anchor head, an anchor body, an exhaust pressure stabilizing component, a corrugated pipe, a grouting rod, a pad cover, and a spherical nut. The exhaust pressure stabilizing component includes an inner connecting rod and an outer connecting sleeve. The inner connecting rod includes a first connecting rod section, an exhaust rod section, and a second connecting rod section.

[0025] The construction method includes the following steps:

[0026] S10, pre-assembled anchor head, anchor body, bellows, venting and pressure stabilizing components, pad cover, grouting rod and spherical nut to form a pre-assembled anchor component;

[0027] S20. Construct the anchor hole, then insert the pre-assembled anchor rod component to anchor the anchor head, and finally install the pad cover, the grouting rod and the spherical nut;

[0028] S30. Grout is injected through the grouting hole of the grouting rod. The grout enters from the bladder part of the grouting rod and flows out from the bottom of the corrugated pipe and into the anchor hole outside the corrugated pipe.

[0029] S40. Continue grouting. The grout flows from the bottom to the top of the anchor hole. The air in the anchor hole flows through the gap between the inner connecting rod and the anchor body and the vent hole provided on the grouting rod and is discharged. And / or, the air in the anchor hole flows through the first vent gap formed between the inner connecting rod and the outer connecting sleeve and the vent hole provided on the grouting rod and is discharged.

[0030] S50. Continue grouting until the grout fills the entire anchor hole. Under the grouting pressure, the outer connecting sleeve deforms to seal the first venting gap formed between the inner connecting rod and the outer connecting sleeve and / or the second venting gap formed between the outer connecting sleeve and the inner wall of the anchor hole.

[0031] Optionally, the pre-assembled anchor head, anchor body, bellows, venting and pressure stabilizing component, gasket cover, grouting rod, and spherical nut form a pre-assembled anchor component, including:

[0032] S101. The anchor head is installed on the inlet section of the anchor rod body, the corrugated pipe is fitted on the anchor rod body, and the outer connecting sleeve is fitted on the venting section of the inner connecting rod.

[0033] S102. The first connecting rod section of the inner connecting rod is screwed to the bellows;

[0034] S103. The pad cover is fitted onto the exposed section of the anchor bolt body;

[0035] S104. Screw the grouting rod to the second connecting rod section;

[0036] S105. Tighten the spherical nut onto the exposed section to form a pre-assembled anchor bolt component.

[0037] The multi-layer anti-corrosion anchor bolt with venting and pressure stabilizing components of the present invention forms a first venting gap by fitting the outer connecting sleeve onto the inner connecting rod. Grout is injected into the grouting channel between the anchor bolt body and the bellows. As the grouting volume increases, air in the anchor hole can be discharged not only through the gap between the inner connecting rod and the anchor bolt body, but also through the first venting gap when the gap between the inner connecting rod and the anchor bolt body is filled with grout. This achieves the venting function. When the anchor bolt hole is filled with grout, the grout pressure increases. Under the thrust of the grout in the anchor hole, the outer connecting sleeve can slide and deform along the direction from the inlet section toward the exposed section to seal the first venting gap formed between the inner connecting rod and the outer connecting sleeve and / or the second venting gap formed between the outer connecting sleeve and the inner wall of the anchor hole. This achieves the grout-stopping and pressure-stabilizing function of the multi-layer anti-corrosion anchor bolt with venting and pressure stabilizing components. Throughout the grouting process, the internal pressure of the multi-layered anti-corrosion anchor rod with venting and pressure stabilizing components remains stable. The grout can penetrate into the surrounding rock outside the anchor hole under stable pressure, improving the anchoring effect. After grouting is completed and the grouting connection pipe is removed, the grout will not flow out from the gaps because the first venting gap and the second venting gap are sealed by the outer connecting sleeve. This prevents the formation of local voids around the anchor rod, which would cause incomplete grouting, ensuring the density of the anchor rod grouting and improving the quality of anchor rod construction. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of a structure of an embodiment of the multi-corrosion-resistant anchor rod with exhaust pressure stabilizing component of the present invention;

[0040] Figure 2 for Figure 1Schematic diagram of the structure of the central exhaust pressure stabilizing component;

[0041] Figure 3 for Figure 1 Schematic diagram of the inner connecting rod;

[0042] Figure 4 This is a schematic flowchart of a construction method for a multi-layer anti-corrosion anchor bolt with an exhaust pressure stabilizing component according to an embodiment of the present invention.

[0043] Figure 5 For the present invention Figure 1 A detailed flowchart of step S10.

[0044] Explanation of icon numbers:

[0045] label name label name 100 Multiple anti-corrosion anchors for exhaust pressure stabilizing components 214 Second connecting rod section 1 Anchor body 22 outer connecting sleeve 11 Manhole Section 3 bellows 12 Exposed section 4 Grouting rod 2 Exhaust pressure stabilizing components 41 Transition connecting pipe 21 Inner connecting rod 42 capsule body 211 First connecting rod segment 422 Slurry inlet 212 Exhaust rod section 5 Through cover of pad 2121 Ventilation slot 51 Exhaust port 212a Conical segment 6 Spherical nut 212b Column segment 7 Anchor head 213 Circular limiting step

[0046] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0048] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0049] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0050] Rock bolt support is widely used in underground caverns such as traffic tunnels and hydraulic tunnels, and is one of the main support measures for tunnels designed according to the "New Austrian Tunneling Method" (NATM). Multi-layered anti-corrosion rock bolts offer multiple protective measures to prevent corrosion and have broad application prospects. They are a widely used support type for tunnels in chloride-corrosion environments.

[0051] As the requirements for the quality of tunnel construction become increasingly stringent, the construction quality of anchor bolts has gradually gained attention. Currently, multi-layered anti-corrosion anchor bolts do not have the functions of air release and grout stop and pressure stabilization, which cannot guarantee the anchoring quality of the anchor bolts and therefore cannot fully exert the support performance of the anchor bolts.

[0052] In view of this, the present invention discloses a multi-layer anti-corrosion anchor rod 1000 with an exhaust and pressure stabilizing component, which can effectively improve the grouting density of the anchor hole, thereby improving the construction quality of the anchor rod. Figures 1 to 3 This invention provides an embodiment of a multi-layer anti-corrosion anchor rod 1000 with an exhaust pressure stabilizing component (hereinafter referred to as "this embodiment").

[0053] This invention discloses a multi-layer anti-corrosion anchor bolt 1000 with an exhaust pressure stabilizing component. The multi-layer anti-corrosion anchor bolt 1000 with an exhaust pressure stabilizing component includes an anchor bolt body 1, an exhaust pressure stabilizing component 2, and a bellows pipe 3. The anchor bolt body 1 has an inlet section 11 for placement in an anchor hole and an exposed section 12 that exposes the anchor hole. The exhaust pressure stabilizing component 2 includes a hollow inner connecting rod 21, which is sleeved on the inlet section 11. From the inlet section 11 toward the exposed section 12, the inner connecting rod 21 includes a first connecting rod section 211 and an exhaust rod section 212. An outer connecting sleeve 22 is fitted onto section 212. An annular limiting step 213 is provided between the first connecting rod section 211 and the exhaust rod section 212. The corrugated pipe 3 is fitted onto the first connecting rod section 211 and abuts against the annular limiting step 213. Under the thrust of the grout in the anchor hole, the outer connecting sleeve 22 can slide and deform along the direction of the inlet section 11 toward the exposed section 12 to seal the first exhaust gap formed between the inner connecting rod 21 and the outer connecting sleeve 22 and / or the second exhaust gap formed between the outer connecting sleeve 22 and the inner wall of the anchor hole.

[0054] The multi-layer anti-corrosion anchor bolt 1000 with an exhaust and pressure stabilizing component of the present invention, by setting the exhaust and pressure stabilizing component 2, sleeves the outer connecting sleeve 22 on the inner connecting rod 21 to form the first exhaust gap. By injecting grout into the grouting channel between the anchor bolt body 1 and the bellows 3, as the grouting volume increases, the air in the anchor hole can not only be discharged through the gap between the inner connecting rod 21 and the anchor bolt body 1, but also through the first exhaust gap when the gap between the inner connecting rod 21 and the anchor bolt body 1 is filled with grout. The air gap is discharged, thereby realizing the venting function. When the anchor bolt hole is filled with grout, the grout pressure increases. Under the thrust of the grout in the anchor bolt hole, the outer connecting sleeve 22 can slide and deform along the direction of the inlet section 11 toward the exposed section 12 to seal the first venting gap formed between the inner connecting rod 21 and the outer connecting sleeve 22 and / or the second venting gap formed between the outer connecting sleeve 22 and the inner wall of the anchor bolt hole, thereby realizing the grout-stopping and pressure-stabilizing function of the multi-corrosion anti-corrosion anchor bolt 1000 with venting and pressure-stabilizing components. Throughout the grouting process, the multi-layered anti-corrosion anchor 1000 with venting and pressure stabilizing components maintains stable pressure inside. The grout can penetrate into the surrounding rock outside the anchor hole under stable pressure, improving the anchoring effect. After grouting is completed and the grouting connection pipe is removed, the grout will not flow out from the gaps because the first venting gap and the second venting gap are sealed by the outer connecting sleeve 22. This prevents the formation of local voids around the anchor and avoids incomplete grouting, ensuring the density of the anchor grouting and improving the quality of anchor construction.

[0055] It should be added that by setting the exhaust and pressure stabilizing component 2, the original structure of the multi-layer anti-corrosion anchor rod does not need to be significantly modified. It is only necessary to connect the exhaust and pressure stabilizing component 2 to the original anti-corrosion structure, such as the corrugated pipe 3 and the grouting pipe. This is convenient and quick, requires less modification to the existing anchor rod assembly, has low modification costs, and does not change the original construction process of the anchor rod. It can also realize that the grout stop plug has both exhaust and grout stop pressure stabilizing functions, effectively improving the grouting density of the anchor rod hole, thereby improving the construction quality of the anchor rod.

[0056] In traditional multi-layer anti-corrosion anchor bolts, the venting channel during grouting is the venting gap formed between the corrugated sleeve and the anchor hole. Gas is discharged to the outside through the venting gap. In this embodiment, to ensure the venting effect of the multi-layer anti-corrosion anchor bolt 1000 with venting and pressure stabilizing components, the outer side of the venting rod section 212 is provided with a venting groove 2121. The venting groove 2121 extends along the length direction of the venting rod section 212. The first venting gap includes the venting groove 2121. Specifically, the venting rod section 212 has a first end face and a second end face in the direction from the inlet section 11 toward the exposed section 12 (i.e., the length direction of the venting rod section 212). The two ends of the venting groove 2121 extend to the first end face and the second end face, respectively. During the grouting process, the gas inside the multi-layer anti-corrosion anchor bolt 1000 with venting and pressure stabilizing components is discharged to the outside through the venting groove 2121, thereby realizing the venting function of the venting and pressure stabilizing components 2.

[0057] It should be further explained that, in order to achieve a better pressure stabilization effect, in this embodiment, the venting groove 2121 does not penetrate the second end face of the exhaust rod segment 212. Specifically, the outer surface of the exhaust rod segment 212 includes a slotted portion and a non-slotted portion along the direction from the inlet segment 11 toward the exposed segment 12 (i.e., the length direction of the exhaust rod segment 212). The venting groove is provided on the slotted portion and penetrates the first end face of the exhaust rod segment 212. When the outer connecting sleeve 22 slides to the non-slotted portion under the action of slurry pressure, the outer connecting sleeve 22 partially covers the slotted portion and partially covers the non-slotted portion to fit tightly with the exhaust rod segment 212, so as to seal the venting groove 2121 provided on the slotted portion to prevent slurry from flowing out.

[0058] To improve the venting effect of the venting and pressure stabilizing component 2, multiple venting grooves 2121 are provided and spaced apart circumferentially along the venting rod segment 212, so that multiple venting channels are formed. Gas can be discharged through multiple venting grooves 2121, avoiding the increase of air pressure inside the anchor rod when the grouting speed is too fast, which would make it difficult for the grout to continuously enter and overflow at the grout inlet hole 422, affecting the construction effect and progress.

[0059] Generally, the exhaust rod segment 212 can be set as a hollow cylinder to facilitate the sliding connection of the outer connecting sleeve 22 on the cylinder. However, to facilitate the movement of the outer connecting sleeve 22, in this embodiment, at least part of the outer surface of the exhaust rod segment 212 is tapered, and the outer diameter of the exhaust rod segment 212 is increased in the direction from the inlet segment 11 to the exposed segment 12. Correspondingly, the inner wall surface of the outer connecting sleeve 22 is adapted to the outer surface of the exhaust rod segment 212 and is also tapered, so that the outer connecting sleeve 22 wraps around the exhaust rod segment 212, making the movement of the outer connecting sleeve 22 smoother. In other embodiments, the exhaust rod segment 212 can also be spherical or other arbitrary hollow shapes, as long as the matching relationship with the outer connecting sleeve 22 is guaranteed, and no specific limitation is made here. In addition, attention should be paid to the dimensional relationship between the exhaust rod section 212, the outer connecting sleeve 22 and the anchor hole. Specifically, the minimum outer diameter of the exhaust rod section 212 must be greater than or equal to the minimum inner diameter of the outer connecting sleeve 22 to prevent the outer connecting sleeve 22 from falling off the exhaust rod section 212. The maximum outer diameter of the exhaust rod section 212 and the maximum inner diameter of the outer connecting sleeve 22 must be equal to or slightly greater than the diameter of the anchor hole to reduce gaps.

[0060] Accordingly, the venting groove 2121 is provided on the conical outer surface of the exhaust rod section 212. Generally, the specific shape of the venting groove 2121 can be square or arc-shaped. To prevent the existence of exhaust dead corners within the venting groove 2121, which would affect exhaust efficiency, the venting groove 2121 can be set as an arc-shaped groove. The groove has a regular arc surface, that is, the orthographic projection of the venting groove 2121 on the first end face of the exhaust rod section 212 is arc-shaped. With this setting, the gas flows well within the arc-shaped groove, and the exhaust speed is fast. Please refer to [link / reference]. Figure 1 and Figure 3 It can be seen that the end of the venting groove near the first connecting rod section 211 is the gas inlet end, and the other end is the gas outlet end. The gas inlet end of the venting groove is a low-pressure area. In order to minimize the pressure loss at the gas inlet end, in this embodiment, the radius of curvature of the cross section of the venting groove 2121 gradually decreases from the direction of the inlet section 11 toward the exposed section 12. The large radius of curvature at the gas inlet end can ensure that the suction resistance at the gas inlet end is small, which is conducive to the passage of gas. The small radius of curvature at the gas outlet end is conducive to the pressure maintenance at the gas outlet end, further improving the pressure stabilizing effect of the exhaust pressure stabilizing component 2.

[0061] To facilitate the sliding of the outer connecting sleeve 22 on the exhaust rod section 212, the exhaust rod section 212 includes a tapered section 212a and a cylindrical section 212b connecting the small end of the tapered section 212a. The annular limiting step 213 is formed on the cylindrical section 212b and the first connecting rod section 211. The outer diameter of the cylindrical section 212b is smaller than the outer diameter of the small end of the tapered section 212a. The outer connecting sleeve 22 is sleeved on the tapered section 212a and the cylindrical section 212b. During installation, a small section of the outer connecting sleeve 22 is not in contact with the exhaust rod section 212 during its active stroke, so as to form a sliding gap to facilitate movement. Furthermore, due to the presence of the annular limiting step 213, the annular limiting step 213 can restrict the installation position of the outer connecting sleeve 22 to prevent the outer connecting sleeve 22 from sliding toward the first connecting rod section 322 and losing its original function. In addition, to ensure that the outer connecting sleeve 22 can fit tightly with the venting rod section 212 when it moves under grouting pressure, the venting rod section 212 does not have the ventilation groove 2121 on its outer surface (i.e., the non-grooved part) near the second end face. In this way, there must be a small section of contact surface between the venting rod section 212 and the outer connecting sleeve 22 that is completely fitted, so that when the grouting is completed, the grout in the first gap is completely wrapped, so as to avoid the grout seeping out of the first gap and forming local voids around the anchor rod, which would cause the grouting to be incomplete and ensure the density of the grout after grouting.

[0062] To improve the sensitivity of the movement of the outer connecting sleeve 22, the end face of the outer connecting sleeve 22 facing away from the exposed section 12 is perpendicular to the inner wall surface of the outer connecting sleeve 22, and the angle between the end face of the outer connecting sleeve 22 and the radial plane of the outer connecting sleeve 22 is α, and 4°≤α≤6°.

[0063] It is known that during the venting and pressure stabilization process of grouting, the outer connecting sleeve 22 needs to deform to seal the first venting gap and the second venting gap. Therefore, the outer connecting sleeve 22 needs to be made of a material with a certain deformation capacity, such as rubber or plastic. Preferably, in this embodiment, the material of the outer connecting sleeve 22 includes rubber. The rubber material can be made of EPDM rubber or neoprene rubber, and the rubber hardness is 40HA~65HA. The rubber material has a high degree of deformation under sufficient pressure, which can tightly fit with the groove wall of the venting groove 2121 to achieve complete sealing of the first venting gap. Since the outer connecting sleeve 22 has a large outer diameter and a small inner diameter on the end face away from the bellows 3, it has a thick rubber material support to avoid large deformation at the second venting gap, so as to completely seal the second venting gap and prevent grout from flowing out.

[0064] To facilitate grouting and prevent grout from spilling out during the grouting process, the inner connecting rod 21 further includes a second connecting rod section 214. The second connecting rod is located on the side of the venting rod section 212 away from the first connecting rod section 211. The multi-layer anti-corrosion anchor rod 1000 with venting and pressure stabilizing components also includes a grouting rod 4. The grouting rod 4 is hollow and includes a transition connecting pipe 41 and a bladder portion 42. The bladder portion 42 is sleeved on the exposed section 12 and has a grout inlet 422. One end of the transition connecting pipe 41 is connected to the bladder portion 42, and the other end is connected to the second connecting rod section 214. Specifically, the grouting rod 4 is sleeved on the anchor body 1 and connected to the second connecting rod section 214, so that a grouting channel is formed between the grouting rod 4 and the anchor body 1, between the second connecting rod section 214 and the anchor body 1, between the venting rod section 212 and the anchor body 1, between the second connecting rod section 214 and the anchor body 1, and between the corrugated pipe 3 and the anchor body 1. This ensures the overall airtightness of the entire multi-layer anti-corrosion anchor 1000 with venting and pressure stabilizing components. The grout enters the bottom of the anchor hole through the grouting channel, and then flows back to the first venting gap through the gap between the corrugated pipe 3 and the anchor hole to fill the first venting gap, thus completing the entire grouting process. It should be noted that the transition connecting pipe 41 and the bladder part 42 are an integral component, which not only improves the connection strength but also ensures the airtightness of the grouting rod 4.

[0065] To lock the grouting rod 4 onto the anchor body 1, the multi-layer anti-corrosion anchor 1000 with venting and pressure stabilizing components also includes a spherical nut 6. The spherical nut 6 is connected to the exposed section 12 and abuts against the bladder portion 42. The exposed section 12 is provided with a threaded structure that mates with the spherical nut 6. The structure is simple and detachable, making it easy to install.

[0066] Furthermore, the multi-layer anti-corrosion anchor 1000 with exhaust and pressure stabilizing components also includes a pad cover 5. The pad cover 5 is sleeved on the outside of the bladder portion 42 to support the bladder portion 42 and seal the anchor hole. The pad cover 5 is also provided with an exhaust hole 51. Gas enters the pad cover 5 through the first exhaust gap and is discharged through the exhaust hole 51. The pad cover 5 can stabilize the anchor rod as a whole on the soil or ground to improve the stability of the entire device.

[0067] It is understood that the first connecting rod and the second connecting rod can be connected to the corrugated pipe 3 and the transition connecting pipe 41 in various ways, and the connection methods can be the same or different, such as snap-fit ​​connection or threaded connection. Considering the stability and airtightness of the components, in this embodiment, the outer side of the first connecting rod segment 211 is provided with a first spiral groove, which is installed in conjunction with the first threaded protrusion on the inner wall of the corrugated pipe 3. The outer side of the second connecting rod segment 214 is provided with a second spiral groove, which is installed in conjunction with the second threaded protrusion on the inner wall of the transition connecting pipe 41. The threaded connection structure is stable and easy to install and disassemble.

[0068] It should be noted that the specific dimensions and material properties of the exhaust pressure stabilizing component 2 and the outer connecting sleeve 22 need to be obtained through testing, taking into account the diameter of the anchor bolt borehole, the diameter of the anchor bolt body 1, the diameter of the corrugated plastic sleeve, and the required stable grouting pressure.

[0069] This invention also provides a construction method for a multi-layer anti-corrosion anchor 1000 with an exhaust and pressure stabilizing component, relating to the aforementioned multi-layer anti-corrosion anchor 1000 with an exhaust and pressure stabilizing component. Please refer to [link / reference needed]. Figure 4 , Figure 4 This is a schematic diagram of the construction method of the multi-layer anti-corrosion anchor 1000 with exhaust pressure stabilizing component in this embodiment. The multi-layer anti-corrosion anchor 1000 with exhaust pressure stabilizing component includes anchor head 7, anchor body 1, exhaust pressure stabilizing component 2, corrugated pipe 3, grouting rod 4, pad cover 5 and spherical nut 6. The exhaust pressure stabilizing component 2 includes inner connecting rod 21 and outer connecting sleeve 22. The inner connecting rod 21 includes first connecting rod section 211, exhaust rod section 212 and second connecting rod section 214.

[0070] The construction method includes the following steps:

[0071] S10, pre-assembled anchor head 7, anchor body 1, bellows 3, venting and pressure stabilizing component 2, pad cover 5, grouting rod 4 and spherical nut 6, to form a pre-assembled anchor component;

[0072] S20. Construct the anchor hole, then insert the pre-assembled anchor rod component to anchor the anchor head 7, and finally install the pad cover 5, the grouting rod 4 and the spherical nut 6.

[0073] S30. Grout is injected through the grout inlet hole 422 of the grouting rod 4. The grout enters through the bladder part 42 of the grouting rod 4 and flows out from the bottom of the corrugated pipe 3 and into the anchor hole outside the corrugated pipe 3.

[0074] S40. Continue grouting. The grout flows from the bottom to the top of the anchor hole. The air in the anchor hole flows through the gap between the inner connecting rod 21 and the anchor body 1 and the vent hole 51 provided on the grouting rod 4 and is discharged. Or, the air in the anchor hole flows through the first vent gap formed between the inner connecting rod 21 and the outer connecting sleeve 22 and the vent hole 51 provided on the grouting rod 4 and is discharged.

[0075] S50. Continue grouting until the grout fills the entire anchor hole. Under the grouting pressure, the outer connecting sleeve 22 deforms to seal the first venting gap formed between the inner connecting rod 21 and the outer connecting sleeve 22 and / or the second venting gap formed between the outer connecting sleeve 22 and the inner wall of the anchor hole.

[0076] Throughout the grouting process, the multi-layered anti-corrosion anchor 1000 with venting and pressure stabilizing components maintains stable pressure inside. The grout can penetrate into the surrounding rock outside the anchor hole under stable pressure, improving the anchoring effect. After grouting is completed and the grouting connection pipe is removed, the grout will not flow out from the gaps because the first venting gap and the second venting gap are sealed by the outer connecting sleeve 22. This prevents the formation of local voids around the anchor and avoids incomplete grouting, ensuring the density of the anchor grouting and improving the quality of anchor construction.

[0077] Further, please refer to Figure 5 , Figure 5 This is a specific step in step S10 of this embodiment. Specifically, the pre-assembled anchor head 7, anchor body 1, bellows 3, venting and pressure stabilizing component 2, pad cover 5, grouting rod 4, and spherical nut 6 form a pre-assembled anchor component, including:

[0078] S101. The anchor head 7 is installed on the inlet section 11 of the anchor body 1, the corrugated pipe 3 is fitted on the anchor body 1, and the outer connecting sleeve 22 is fitted on the exhaust rod section 212 of the inner connecting rod 21.

[0079] S102. The first connecting rod segment 211 of the inner connecting rod 21 is screwed to the bellows 3.

[0080] S103. The pad cover 5 is fitted onto the exposed section 12 of the anchor bolt body 1;

[0081] S104. Screw the grouting rod 4 to the second connecting rod section 214;

[0082] S105. Tighten the spherical nut 6 onto the exposed section 12 to form a pre-assembled anchor bolt component.

[0083] This construction method is simple and has a good grouting effect. During the installation of the exhaust pressure stabilizing component 2, it is only necessary to pay attention to adjusting the installation position of the outer connecting sleeve 22 and the exhaust rod section 212. In the installation of the pre-assembled anchor rod component, threaded connection is mostly used, which is simple and quick.

[0084] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A multiple corrosion-protected anchor rod with an exhaust pressure stabilizing member, characterized by, The utility model relates to an anchor rod body, exhaust pressure stabilizing component and corrugated pipe, and the utility model discloses the following technical scheme: Anchoring rod body, having a hole section for being placed in the anchor hole and a exposed section for exposing the anchor hole; Exhaust pressure stabilizing component, including the hollow setting inner connecting rod, the inner connecting rod is sleeved on the hole section, from the hole section to the direction of the exposed section, the inner connecting rod includes the first connecting rod section and the exhaust rod section, the outer connecting sleeve is sleeved on the exhaust rod section, the annular limiting step is arranged between the first connecting rod section and the exhaust rod section;And, The corrugated pipe is sleeved on the first connecting rod section and abuts on the annular limiting step; Under the thrust of the slurry in the anchor hole, the outer connecting sleeve can slide and deform along the direction of the hole section to the exposed section to seal the first exhaust gap between the inner connecting rod and the outer connecting sleeve and the second exhaust gap between the outer connecting sleeve and the inner wall of the anchor hole; The outer side of the exhaust rod section is provided with a ventilation groove extending along the length direction of the exhaust rod section, and the first exhaust gap includes the ventilation groove; The outer side of the exhaust rod section includes a slotted part and a non-slotted part along the direction from the hole section to the exposed section, the ventilation groove is arranged on the slotted part and penetrates the first end surface of the exhaust rod section, when the outer connecting sleeve slides to the non-slotted part under the slurry pressure, the outer connecting sleeve partially covers the slotted part and partially covers the non-slotted part to tightly fit with the exhaust rod section, so as to seal the ventilation groove arranged on the slotted part.

2. The multi-corrosion-proof anchor rod with the exhaust pressure stabilizing member according to claim 1, wherein The ventilation groove is provided with a plurality of ventilation grooves and is arranged in a circumferential direction of the exhaust rod section;And / or, The curvature radius of the cross section of the ventilation groove gradually decreases along the direction from the hole section to the exposed section.

3. The multi-corrosion-proof anchor rod with the exhaust pressure stabilizing member according to claim 1, wherein The outer side of the exhaust rod section is provided with a tapered surface, and the outer diameter of the exhaust rod section increases along the direction from the hole section to the exposed section, and the inner wall surface of the outer connecting sleeve and the outer side of the exhaust rod section are matched and provided with a tapered surface.

4. The multi-corrosion-proof anchor rod with the exhaust pressure stabilizing member according to claim 3, wherein The exhaust rod section includes a tapered section and a cylindrical section connected to the small end of the tapered section, the annular limiting step is formed on the cylindrical section and the first connecting rod section, and the outer diameter of the cylindrical section is smaller than the outer diameter of the small end of the tapered section; The outer connecting sleeve is sleeved on the tapered section and the cylindrical section.

5. The multi-corrosion-proof anchor rod with the exhaust pressure stabilizing member according to claim 1, wherein The material of the outer connecting sleeve includes rubber material, and the rubber hardness is 40HA-65HA;And / or, The end surface of the outer connecting sleeve away from the exposed section is perpendicular to the inner wall surface of the outer connecting sleeve, and the included angle between the end surface and the radial plane of the outer connecting sleeve is alpha, and 4°≤alpha≤6°;And / or, The outer side of the first connecting rod section is provided with a first spiral groove matched with a first threaded protrusion arranged on the inner wall of the corrugated pipe.

6. The multi-corrosion-proof anchor rod with the exhaust pressure stabilizing member according to claim 1, wherein The inner connecting rod further includes a second connecting rod section, and the second connecting rod is arranged on the side of the exhaust rod section away from the first connecting rod section. The multiple corrosion-proof anchor rod with the exhaust pressure stabilizing component further comprises a grouting rod, which is hollowly arranged and comprises a transition connecting pipe and a capsule part, the capsule part is sleeved on the exposed section and is provided with a grouting inlet, one end of the transition connecting pipe is connected with the capsule part and the other end is connected with the second connecting rod section.

7. The multi-corrosion-proof anchor rod with the exhaust pressure stabilizing member according to claim 6, wherein The multiple corrosion-proof anchor rod with the exhaust pressure stabilizing component further comprises a cushion plate cover, which is sleeved outside the capsule part to support the capsule part and block the anchor hole, and is further provided with an exhaust hole; and / or, The multiple corrosion-proof anchor rod with the exhaust pressure stabilizing component further comprises a spherical nut, which is connected with the exposed section and abuts against the capsule part; and / or, The second connecting rod section is provided with a second spiral groove on the outer side surface, which is matched and installed with a second thread convex arranged on the inner wall of the transition connecting pipe.

8. A method for constructing a multi-corrosion-protected anchor rod with an exhaust pressure stabilizing member, using the multi-corrosion-protected anchor rod with an exhaust pressure stabilizing member according to any one of claims 1 to 7, characterized in that, The multiple corrosion-proof anchor rod with the exhaust pressure stabilizing component comprises an anchoring head, an anchor rod body, an exhaust pressure stabilizing component, a bellows, a grouting rod, a cushion plate cover and a spherical nut, the exhaust pressure stabilizing component comprises an inner connecting rod and an outer connecting sleeve, the inner connecting rod comprises a first connecting rod section, an exhaust rod section and a second connecting rod section; The construction method comprises the following steps: S10, pre-assemble the anchoring head, the anchor rod body, the bellows, the exhaust pressure stabilizing component, the cushion plate cover, the grouting rod and the spherical nut to form a pre-assembled anchor rod component; S20, construct an anchor hole, then insert the pre-assembled anchor rod component, anchor the anchoring head, and finally install the cushion plate cover, the grouting rod and the spherical nut; S30, grout from the grouting hole of the grouting rod, the grout enters the capsule part of the grouting rod and flows out from the bottom of the bellows and into the anchor hole outside the bellows; S40, continue to continuously grout, the grout flows along the bottom of the anchor hole to the top, the air in the anchor hole flows through the gap between the inner connecting rod and the anchor rod body and the exhaust hole arranged on the grouting rod to be discharged, and / or the air in the anchor hole flows through the first exhaust gap formed between the inner connecting rod and the outer connecting sleeve and the exhaust hole arranged on the grouting rod to be discharged; S50, continue to continuously grout, the grout fills the entire anchor hole, under the action of grouting pressure, the outer connecting sleeve slides and deforms along the first connecting rod to the second connecting rod direction to seal the first exhaust gap formed between the inner connecting rod and the outer connecting sleeve and the second exhaust gap formed between the outer connecting sleeve and the inner wall of the anchor hole.

9. The construction method according to claim 8, wherein The pre-assembled anchoring head, anchor rod body, bellows, exhaust pressure stabilizing component, cushion plate cover, grouting rod and spherical nut to form a pre-assembled anchor rod component comprise: S101, install the anchoring head on the entry hole section of the anchor rod body, sleeve the bellows on the anchor rod body, and sleeve the outer connecting sleeve on the exhaust rod section of the inner connecting rod; S102, screw the first connecting rod section of the inner connecting rod with the bellows; S103, sleeve the cushion plate cover on the exposed section of the anchor rod body; S104, screwing the grouting rod with the second connecting rod section; S105, locking the spherical nut on the exposed section to form a pre-assembled anchor rod component.

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