Prestressed anchoring device
By installing a prestressed anchoring device with flexible bellows and locking devices on the anchor cable, the shortcomings of traditional anchoring agent in crushing surrounding rocks and large-diameter drilling are solved, and full-length grouting reinforcement and anchoring at the end of the anchor cable are achieved, improving the support effect of large-deformed tunnels.
Patent Information
- Application Number
- CN202422035337.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-08-21
AI Technical Summary
Traditional anchoring agents are difficult to effectively anchor in crushed surrounding rocks and large-diameter drilling holes, and grouting anchors can only achieve full-length anchoring and cannot effectively exert the support performance of the anchor rod (cord).
A prestressed anchoring device including anchor cable, flexible corrugated pipe and locking device is adopted. The flexible corrugated pipe set is outside the free section of the anchor cable to achieve full-length grouting reinforcement while achieving end anchoring through the locking device.
While grouting and strengthening the surrounding rocks in full length, the end anchoring of the anchor cable is achieved, overcoming the shortcomings of traditional anchoring agent in crushing surrounding rocks and large-diameter drilling, and improving the support effect of large-deformed tunnels.
Smart Images
Figure CN222949894U_ABST
Abstract
Description
Technical Field
[0001] The utility model discloses a prestressed anchoring device, which belongs to the technical field of anchoring and is particularly suitable for grouting anchoring of broken surrounding rocks. Background Art
[0002] For the support of large deformation tunnels in underground projects, especially for areas with large degree of fragmentation or requiring the use of large-diameter drilling rigs for drilling, the traditional anchor rod (cable) reinforcement form is used for support, which mainly has the following problems: on the one hand, due to the large degree of fragmentation of the surrounding rock, traditional anchoring agents are difficult to anchor; on the other hand, due to the large borehole diameter, traditional anchoring agents are difficult to anchor. In the past, grouting anchoring was used for this situation, but it was full-hole grouting after sealing the hole, which resulted in the full-length anchoring of the anchor rod (cable), and the end anchoring could not be achieved, and the support performance of the anchor rod (cable) could not be effectively exerted, which greatly reduced the support effect and was not conducive to the control of the surrounding rock of the large deformation tunnel. Utility Model Content
[0003] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a prestressed anchoring device that can achieve end anchoring while reinforcing the surrounding rock through full-length grouting.
[0004] To achieve the above purpose, the utility model adopts the following technical scheme: a prestressed anchoring device, comprising an anchor cable, a flexible bellows and a locking device, the anchor cable is divided into a free section and an anchoring section, the flexible bellows is sleeved outside the free section, an annular isolation space is formed between the inner wall and the free section, the bottom end of the flexible bellows is located at the junction of the free section and the anchoring section, and the top and bottom ends of the flexible bellows are both sealed and connected to the anchor cable through the locking device;
[0005] The flexible corrugated tube is a tube with bending elasticity and axial elongation elasticity, and the cross section of the tube body is corrugated.
[0006] Preferably, it also includes a sealing device, which is sleeved on the outside of the free section and is arranged close to the top end of the flexible bellows.
[0007] Preferably, the sealing device comprises an annular elastic bag, a water injection pipe and a grouting pipe, the water outlet end of the water injection pipe is inserted into the annular elastic bag, and the slurry outlet end of the grouting pipe penetrates the entire annular elastic bag and is located below the annular elastic bag.
[0008] Preferably, the sealing device also includes an upper pressure plate and a lower pressure plate respectively located on the upper and lower sides of the annular elastic bag, the annular elastic bag includes an outer ring elastic wall and an inner ring elastic wall, the lower end face of the upper pressure plate is provided with a concentrically arranged outer ring mounting ring and an inner ring mounting ring, the upper end face of the lower pressure plate is provided with a concentrically arranged outer ring mounting ring and an inner ring mounting ring, the outer ring elastic wall is fixed on the outer ring mounting rings of the upper and lower pressure plates, the inner ring elastic wall is fixed on the inner ring mounting rings of the upper and lower pressure plates, the water outlet end of the water injection pipe passes through the upper pressure plate and is located inside the annular elastic bag, and the slurry outlet end of the grouting pipe passes through the upper and lower pressure plates and is located below the lower pressure plate.
[0009] Preferably, a stop valve is provided on the water injection pipe.
[0010] Preferably, the annular elastic bag is made of rubber.
[0011] Preferably, the locking device comprises a constant diameter elastic ring and a variable diameter elastic ring, annular convex ribs are arranged at intervals on the inner wall of the constant diameter elastic ring, and the large diameter end of the variable diameter elastic ring is connected to the constant diameter elastic ring;
[0012] The constant diameter elastic ring is sleeved on the flexible bellows, the annular convex ribs match the grooves of the corrugations of the flexible bellows body, and the variable diameter elastic ring is sleeved on the anchor cable.
[0013] Preferably, the locking device is made of rubber.
[0014] Preferably, the anchor cable is replaced by an anchor rod.
[0015] Preferably, the flexible corrugated tube is made of PE material.
[0016] Compared with the prior art, the utility model has the following beneficial effects.
[0017] 1. In the utility model, the flexible bellows is sleeved on the outside of the free section of the anchor cable (anchor rod) to isolate the free section of the anchor cable (anchor rod) from the slurry. The slurry only consolidates the anchoring section of the anchor cable (anchor rod) with the surrounding surrounding rock, so that the device can achieve the end anchoring of the anchor cable (anchor rod) while reinforcing the surrounding surrounding rock in all directions through full-length grouting, thus overcoming the shortcomings of traditional anchoring agents that are difficult to anchor broken surrounding rock and difficult to anchor when the borehole diameter is large, and also solving the problem that grouting anchoring can only be anchored along the entire length, thereby greatly improving the support effect on large deformation tunnels.
[0018] 2. In the utility model, the flexible bellows can be bent in coordination with the anchor cable (anchor rod). The corrugated tube body enables the tube body to have a certain radial pressure-bearing capacity. During the grouting process, the tube body will not undergo obvious radial contraction and will fit with the anchor cable (anchor rod) to form a mechanical bite, thereby ensuring the freedom of the free section of the anchor cable (anchor rod).
[0019] 3. In the utility model, after water injection and pressurization, the sealing device fits tightly with the anchor cable (anchor rod) and the inner wall of the borehole to achieve hole sealing. After the hole is sealed, the borehole can be pressurized and grouting can be performed to achieve better reinforcement of the surrounding rock, especially the broken surrounding rock. After the grouting is completed, the sealing device is depressurized and can be disassembled and reused next time.
[0020] 4. In the utility model, the annular ribs on the equal-diameter elastic ring of the locking device fit tightly with the grooves of the corrugations of the flexible bellows body, and the variable-diameter elastic ring fits tightly with the anchor cable (anchor rod) by virtue of its elasticity, sealing and connecting the flexible bellows and the anchor cable (anchor rod) together, thus preventing slurry from entering between the flexible bellows and the anchor cable (anchor rod) during grouting, and ensuring the isolation effect between the free section of the anchor cable (anchor rod) and the slurry. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0022] Figure 1 It is a structural schematic diagram of the utility model.
[0023] Figure 2 It is a schematic diagram of the structure of the flexible bellows in the utility model.
[0024] Figure 3 It is a schematic structural diagram of the sealing device 5 in the first embodiment.
[0025] Figure 4 It is a schematic diagram of the structure of the sealing device 5 in the second embodiment.
[0026] Figure 5 for Figure 4 Top view of the .
[0027] Figure 6 It is a structural schematic diagram of the locking device 3 in the utility model.
[0028] Figure 7 It is a schematic diagram of the utility model when it is placed in a drill hole.
[0029] Figure 8 It is a schematic diagram of the sealing device of the utility model after water is injected.
[0030] Fig. 9 It is a schematic diagram of tensioning and pre-tightening the anchor cable in the utility model after grouting.
[0031] In the figure: 1 is an anchor cable, 11 is a free section, 12 is an anchoring section, 2 is a flexible bellows, 3 is a locking device, 31 is an elastic ring of equal diameter, 32 is an elastic ring of variable diameter, 4 is an annular isolation space, 5 is a sealing device, 51 is an annular elastic bag, 511 is an outer ring elastic wall, 512 is an inner ring elastic wall, 52 is a water injection pipe, 53 is a grouting pipe, 54 is an upper pressure plate, 55 is a lower pressure plate, 56 is a stop valve, 6 is a drill hole, 7 is a tray, and 8 is a lock. DETAILED DESCRIPTION
[0032] Combined with the drawings in the embodiments of the utility model, the technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0033] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions for the implementation of the utility model, so they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical contents disclosed by the utility model. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from other entities, and do not necessarily require or imply any actual relationship or order between these entities.
[0034] The utility model provides the following embodiments.
[0035] Embodiment 1
[0036] like Figure 1 Figure 2 As shown, the utility model is a prestressed anchoring device, comprising an anchor cable 1, a flexible bellows 2 and a locking device 3, the anchor cable 1 is divided into a free section 11 and an anchor section 12, the flexible bellows 2 is sleeved outside the free section 11, an annular isolation space 4 is formed between the inner wall and the free section 11, the bottom end of the flexible bellows 2 is located at the junction of the free section 11 and the anchor section 12, and the top and bottom ends of the flexible bellows 2 are both sealed and connected to the anchor cable 1 through the locking device 3;
[0037] The flexible corrugated tube 2 is a tube with bending elasticity and axial elongation elasticity, and the cross section of the tube body is corrugated.
[0038] The anchoring section 12 is a section at the end of the anchor cable 1 that needs to be anchored together with the surrounding rock according to the support design requirements; the free section 11 is the other section of the anchor cable 1 except the anchoring section 12. The free section 11 is not anchored together with the surrounding rock, and can move freely in the axial direction without hindrance during the later tensioning process of the cable body. The junction of the free section 11 and the anchoring section 12 can be marked with a marking line to facilitate the positioning of the bottom end of the flexible corrugated tube 2.
[0039] The anchor cable 1 is a steel strand, and is mainly used for supporting large deformation tunnels.
[0040] The utility model further comprises a sealing device 5 , which is sleeved on the outside of the free section 11 and is arranged close to the top end of the flexible bellows 2 .
[0041] like Figure 3 As shown, the sealing device 5 includes an annular elastic bag 51, a water injection pipe 52 and a grouting pipe 53. The water outlet end of the water injection pipe 52 is inserted into the annular elastic bag 51, and the grouting end of the grouting pipe 53 penetrates the entire annular elastic bag 51 and is located below the annular elastic bag 51.
[0042] The water injection pipe 52 is provided with a stop valve 56 .
[0043] The annular elastic bag 51 is made of rubber.
[0044] like Figure 6 As shown, the locking device 3 includes a constant diameter elastic ring 31 and a variable diameter elastic ring 32, annular convex ribs 33 are arranged on the inner wall of the constant diameter elastic ring 31 at intervals, and the large diameter end of the variable diameter elastic ring 32 is connected to the constant diameter elastic ring 31;
[0045] The constant diameter elastic ring 31 is sleeved on the flexible bellows 2 , the annular convex rib 33 matches with the groove of the corrugation of the flexible bellows 2 , and the variable diameter elastic ring 32 is sleeved on the anchor cable 1 .
[0046] The locking device 3 is made of rubber.
[0047] The anchor cable 1 can be replaced by an anchor rod.
[0048] The flexible corrugated tube 2 is made of PE material, which is polyethylene.
[0049] Embodiment 2
[0050] like Figure 4 , Figure 5As shown, the structure of the sealing device 5 in this embodiment is: it includes an annular elastic bag 51, a water injection pipe 52 and a grouting pipe 53, and also includes an upper pressure plate 54 and a lower pressure plate 55 respectively located on the upper and lower sides of the annular elastic bag 51, the annular elastic bag 51 includes an outer ring elastic wall 511 and an inner ring elastic wall 512, the lower end surface of the upper pressure plate 54 has a concentrically arranged outer ring mounting ring and an inner ring mounting ring, the upper end surface of the lower pressure plate 55 has a concentrically arranged outer ring mounting ring and an inner ring mounting ring, the outer ring elastic wall 511 is fixed on the outer ring mounting rings of the upper pressure plate 54 and the lower pressure plate 55, the inner ring elastic wall 512 is fixed on the inner ring mounting rings of the upper pressure plate 54 and the lower pressure plate 55, the water outlet end of the water injection pipe 52 passes through the upper pressure plate 54 and is located inside the annular elastic bag 51, and the slurry outlet end of the grouting pipe 53 passes through the upper pressure plate 54 and the lower pressure plate 55 and is located below the lower pressure plate 55.
[0051] The rest of the structure in this embodiment is the same as that in the first embodiment.
[0052] The sealing device 5 in this embodiment has a more solid structure, better sealing performance, longer service life, and is convenient for repeated use.
[0053] like Figure 7 , Figure 8 , Fig. 9 As shown, the anchoring process of the utility model is as follows.
[0054] The first step is to use a drilling machine to construct a borehole 6 on the surrounding rock of the tunnel, and the length of the borehole 7 matches the length of the anchor cable 1;
[0055] In the second step, the anchor cable 1 with the flexible bellows 2 sealed and installed by the locking device 3 is placed into the drilled hole 6, and the sealing device 5 is mounted on the anchor cable 1, and the sealing device 5 is located at the hole mouth.
[0056] The third step is to connect the water injection pipe 52 on the sealing device 5 to the water injection pump, turn on the water injection pump to fill the sealing device 5 with water, expand the annular elastic bag 51, and make it closely contact with the anchor cable 1 and the wall of the borehole 6 respectively, and then close the stop valve 56 to achieve the sealing.
[0057] The fourth step is to connect the grouting pipe 53 on the sealing device 5 to the grouting pump, turn on the grouting pump to grout the borehole 6, the slurry will fill the borehole 6 and diffuse to the cracks around the surrounding rock. When the grouting pressure reaches 3MPa, stop grouting.
[0058] Step 5: After stopping the grouting for 1 hour, open the stop valve 56 to relieve the pressure on the sealing device 5. After the pressure is relieved, the sealing device 5 is dismantled and recovered for reuse next time;
[0059] The sixth step is to wait for the slurry to reach a certain strength, then install the matching tray 7 and lock 8, and perform tensioning to achieve end anchoring of the reinforced area.
[0060] In the sixth step, the locking device 3 located on the upper part of the flexible bellows 2 is solidified with the mortar. When pre-tensioning, there will be a little resistance to the anchor cable 1, but this resistance is very small for the pre-tensioning force and can be ignored, and will not affect the axial movement of the free section of the anchor cable 1.
[0061] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.
Claims
1. A prestressed anchoring device, characterized in that: The invention comprises an anchor cable (1), a flexible bellows (2) and a locking device (3); the anchor cable (1) is divided into a free section (11) and an anchor section (12); the flexible bellows (2) is sleeved outside the free section (11); an annular isolation space (4) is formed between the inner wall and the free section (11); the bottom end of the flexible bellows (2) is located at the junction of the free section (11) and the anchor section (12); the top and bottom ends of the flexible bellows (2) are both sealed and connected to the anchor cable (1) through the locking device (3); The flexible corrugated tube (2) is a tube having bending elasticity and axial elongation elasticity, and the cross section of the tube body is corrugated.
2. A prestressed anchoring device according to claim 1, characterized in that: It also comprises a sealing device (5), which is sleeved on the outside of the free section (11) and is arranged close to the top end of the flexible bellows (2).
3. A prestressed anchoring device according to claim 2, characterized in that: The sealing device (5) comprises an annular elastic bag (51), a water injection pipe (52) and a grouting pipe (53); the water outlet end of the water injection pipe (52) is inserted into the interior of the annular elastic bag (51), and the grouting end of the grouting pipe (53) penetrates the entire annular elastic bag (51) and is located below the annular elastic bag (51).
4. A prestressed anchoring device according to claim 3, characterized in that: The sealing device (5) further comprises an upper pressure plate (54) and a lower pressure plate (55) respectively located on the upper and lower sides of the annular elastic bag (51); the annular elastic bag (51) comprises an outer ring elastic wall (511) and an inner ring elastic wall (512); the lower end surface of the upper pressure plate (54) comprises an outer ring mounting ring and an inner ring mounting ring which are arranged concentrically; the upper end surface of the lower pressure plate (55) comprises an outer ring mounting ring and an inner ring mounting ring which are arranged concentrically; the outer ring elastic wall (511) is fixed on the outer ring mounting rings of the upper pressure plate (54) and the lower pressure plate (55); the inner ring elastic wall (512) is fixed on the inner ring mounting rings of the upper pressure plate (54) and the lower pressure plate (55); the water outlet end of the water injection pipe (52) passes through the upper pressure plate (54) and is located inside the annular elastic bag (51); the grout outlet end of the grout injection pipe (53) passes through the upper pressure plate (54) and the lower pressure plate (55) and is located below the lower pressure plate (55).
5. A prestressed anchoring device according to claim 3 or 4, characterized in that: The water injection pipe (52) is provided with a stop valve (56).
6. A prestressed anchoring device according to claim 3 or 4, characterized in that: The material of the annular elastic bag (51) is rubber.
7. A prestressed anchoring device according to claim 1 or 2, characterized in that: The locking device (3) comprises a uniform diameter elastic ring (31) and a variable diameter elastic ring (32); annular convex ribs (33) are arranged at intervals on the inner wall of the uniform diameter elastic ring (31); and the large diameter end of the variable diameter elastic ring (32) is connected to the uniform diameter elastic ring (31); The constant diameter elastic ring (31) is sleeved on the flexible bellows (2), the annular convex rib (33) matches the groove of the corrugation of the flexible bellows (2), and the variable diameter elastic ring (32) is sleeved on the anchor cable (1).
8. A prestressed anchoring device according to claim 7, characterized in that: The locking device (3) is made of rubber.
9. A prestressed anchoring device according to claim 1 or 2, characterized in that: The anchor cable (1) is replaced by an anchor rod.
10. A prestressed anchoring device according to claim 1 or 2, characterized in that: The flexible corrugated tube (2) is made of PE material.