Anti-seepage side slope pre-stressed anchor cable structure

Abstract

The invention discloses an anti-seepage side slope pre-stressed anchor cable structure which comprises a steel strand, an anchor hole, a steel base plate, an anchor head, a grouting body filled in an anchoring section of the anchor hole in a grouting mode and an anchor hole sleeve arranged in a free section of the anchor hole, and is characterized by further comprising an anti-seepage sleeve assembly, a plugging ring, a first grouting pipe and a drainage pipe. The anti-seepage casing pipe assembly comprises a casing pipe seat, an expansion sealing ring and an anti-seepage casing pipe; the casing pipe seat is connected with an inner wall ring sleeve of the anchor hole casing pipe in a sealing manner; one end of the expansion sealing ring is connected with the inner side surface of the casing pipe seat in a sealing manner; the other end of the expansion sealing ring is connected with the outer end surface of the anti-seepage casing pipe in a sealing manner; the anti-seepage sleeve assembly, the anchor hole sleeve and the grouting body define a water drainage annular cavity used for guiding and draining seepage water near the position of the pre-stressed anchor cable structure. The problem that water leakage of an existing side slope pre-stressed anchor cable is difficult to dispose is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of prestressed anchor cables, and specifically discloses a leakage-proof slope prestressed anchor cable structure. Background Art

[0002] Usually, after the prestressed anchor cables on the slope are tensioned and locked, water leakage from the anchor cable holes is a common construction quality problem. When the hydrogeological conditions of the slope are poor, the slope is cut off, and drainage measures are not in place, prestressed anchor cables are prone to water leakage. Usually, water flows out through the channels formed by the anchor cable drilling holes, which may cause early rust or even rust and failure of the anchor cables. When the prestressed anchor cables on the slope leak, they are usually sealed by drilling and grouting, which has a high treatment cost and is prone to secondary water leakage. Summary of the invention

[0003] In view of the above problems, the present invention provides a leakage-proof prestressed anchor cable structure for slopes, which solves the problem that leakage of the existing prestressed anchor cables for slopes is difficult to deal with.

[0004] The present invention is achieved through the following technical solutions.

[0005] A leakage-proof prestressed anchor cable structure for slopes, comprising a steel strand, an anchor hole, a steel pad, an anchor head, a grouting body filled in an anchoring section of the anchor hole, and an anchor hole casing arranged in a free section of the anchor hole, characterized in that it also comprises: an anti-seepage casing assembly, a plugging ring, a first grouting pipe, and a drainage pipe;

[0006] The anti-seepage sleeve assembly comprises a sleeve seat which is sealed with the inner wall ring sleeve of the anchor hole sleeve, an expansion sealing ring which is sealed with the inner side surface of the sleeve seat at one end and the outer end surface of the anti-seepage sleeve at the other end, and an anti-seepage sleeve which is inserted into the inside of the anchor hole sleeve and the inner end of which is connected to the grouting body; the anti-seepage sleeve assembly, the anchor hole sleeve and the grouting body are enclosed to form a drainage annular cavity for draining water seepage near the position of the prestressed anchor cable structure;

[0007] The anchor hole casing is provided with a plurality of drainage holes on the inner wall below the drainage annular cavity, and the surrounding soil below the drainage holes is replaced with a water filter filler; the drainage pipe is obliquely inserted into the slope soil, and the higher end of the drainage pipe extends into the water filter filler, and the lower end extends outside the slope soil;

[0008] The blocking ring is serially fixed to the steel strand and embedded in the expansion sealing ring, so that the circumferential side of the blocking ring is close to the inner side wall of the expansion sealing ring;

[0009] The first grouting pipe is arranged in the anchor hole casing, and one end thereof seals and passes through the sealing ring to extend into the anti-seepage casing, and the other end seals and passes through the outer end side wall of the anchor hole casing and the steel pad to extend out of the slope soil body.

[0010] Preferably, the outer side surface of the sealing ring is inwardly concave in an arc shape.

[0011] Preferably, the outer wall of the end of the drainage pipe extending into the water filtering filler is evenly provided with a plurality of water filtering holes.

[0012] Preferably, the water filter filler is made of sand and gravel wrapped with geotextile.

[0013] Preferably, the drainage hole is plugged with a foam ball wrapped with two layers of geotextile.

[0014] Preferably, the present invention further comprises a reinforcing ring having a sleeve seal disposed on the outer end surface of the anchor hole casing, and an inner pad having a sleeve seal disposed on the outside of the reinforcing ring.

[0015] Preferably, the first grouting pipe sequentially passes through the outer end side wall of the anchor hole casing, the reinforcement ring, the inner pad and the steel pad and extends to the outside of the slope soil body.

[0016] Preferably, the reinforcement ring and the inner pad are made of cast iron.

[0017] Preferably, the present invention further comprises a second grouting pipe, one end of which passes through the outer end side wall of the anchor hole casing and is connected with the interior of the anchor hole casing, and the other end of which extends to the outside of the slope soil body.

[0018] Preferably, the first grouting pipe includes a first hard pipe section, a flexible hose section with an extendable length, and a second hard pipe section connected in sequence. The first hard pipe section seals and penetrates the sealing ring to extend into the anti-seepage casing, and the second hard pipe section seals and penetrates the outer end side wall of the anchor hole casing and the steel pad to extend out of the slope soil body.

[0019] Compared with the prior art, the beneficial effects of the present invention include at least the following aspects:

[0020] 1) The present invention adds an anti-seepage casing assembly and a drainage pipe to the traditional prestressed anchor cable structure on the slope, so that when slow water seepage occurs in the prestressed anchor cable hole in the later stage, the drainage annular cavity formed by the anti-seepage casing assembly, the anchor hole casing and the grouting body cooperates with the drainage hole and the drainage pipe to discharge the seepage water in time. In this way, the slope seepage water will not directly penetrate into the anchor hole casing and contact the steel strand, thereby effectively preventing rust or even rust breakage.

[0021] 2) When water seepage occurs in the prestressed anchor cable structure, the existing treatment method is usually to drill holes and fill the anchor hole casing of the free section with grouting. However, while achieving grouting and water stopping, the steel strands of the free section will not be able to play a prestressing role. The present invention cooperates with the sealing ring by setting an expansion sealing ring. When the drainage capacity of the drainage annular cavity, the drainage hole and the drainage pipe is insufficient, the drainage annular cavity will be filled with seepage water. Under the action of water pressure, the expansion sealing ring will be pressed to expand and squeeze toward the sealing ring, and then the expansion sealing ring and the sealing ring will fit and seal. In this way, the anti-seepage casing, the sealing ring and the grouting body will form a sealing section space, so that the first grouting pipe can be used to quickly grout the sealing section space to stop water, so as to achieve the effect of segmented grouting and water stopping. In this way, the remaining steel strands at the free section position can still play a prestressing role to ensure the anchoring stability of the slope prestressed anchor cable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a slope prestressed anchor cable structure in the prior art;

[0023] Figure 2 It is a structural schematic diagram of the slope prestressed anchor cable structure of the present invention;

[0024] Figure 3 yes Figure 2 The enlarged schematic diagram of the center C;

[0025] Figure 4 yes Figure 2 Cross-section at AA in the middle;

[0026] Figure 5 yes Figure 2 Cross-section at the middle BB;

[0027] Figure 6 It is a schematic diagram of the cross-sectional three-dimensional structure of the anti-seepage casing assembly and the anchor hole casing;

[0028] Figure 7 It is a three-dimensional structural schematic diagram of the anti-seepage casing assembly and the anchor hole casing;

[0029] Figure 8 is a schematic diagram of water-stop grouting using the first grouting pipe;

[0030] Fig. 9 It is a three-dimensional structural schematic diagram of the connection between the reinforcement ring, the inner pad and the anchor hole casing;

[0031] The meanings of the marks in the above figure are: steel strand 1, anchor hole 2, steel pad 3, anchor head 4, grouting body 5, anchor hole casing 6, drainage hole 601, foam ball 6011, water filter filler 602, anti-seepage casing assembly 7, casing seat 701, expansion sealing ring 702, anti-seepage casing 703, plugging ring 8, first grouting pipe 9, first hard pipe section 901, hose section 902, second hard pipe section 903, drainage pipe 10, drainage annular cavity 11, slope soil 12, reinforcement ring 13, inner pad 14, waist beam 15, water-stop grouting body 16. DETAILED DESCRIPTION

[0032] The present invention is further described in the form of specific embodiments in conjunction with the accompanying drawings. It should be pointed out that the following implementation modes are only illustrative descriptions of the present invention in the form of examples, but the protection scope of the present invention is not limited thereto. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1

[0034] This embodiment provides a slope prestressed anchor cable structure, which is a common anchor cable structure in the prior art. Figure 1 , which includes a steel strand 1, an anchor hole 2, a steel pad 3, an anchor head 4, a grouting body 5 filled in the anchoring section of the anchor hole 2, and an anchor hole sleeve 6 arranged in the free section of the anchor hole 2. During the use of the slope prestressed anchor cable structure of this embodiment, if the hydrogeological conditions of the slope are poor, the slope is cut, and the drainage measures are not in place, the prestressed anchor cable is prone to water leakage, especially the water in the slope soil is easy to directly penetrate into the anchor hole sleeve from the joint between the anchor hole sleeve and the grouting body, so that the water flows out through the channel formed by the anchor hole sleeve, which may cause the anchor cable to rust early or even rust and fail, thereby causing safety hazards such as slope instability. On the basis of the existing slope prestressed anchor cable structure, if the anchor cable structure seeps water, it is usually sealed by drilling and grouting, which not only has high processing costs, but also is prone to secondary water leakage; in order to ensure the grouting water-stopping effect, the anchor hole sleeve 6 of the free section can be filled with grouting, but it will affect the prestressing effect of the free section steel strand.

[0035] Example 2

[0036] This embodiment provides a leakage-proof slope prestressed anchor cable structure, see Figures 2 to 8 , which further comprises, on the basis of embodiment 1: an anti-seepage casing assembly 7, a plugging ring 8, a first grouting pipe 9 and a drainage pipe 10;

[0037] Wherein: the anti-seepage sleeve assembly 7 comprises a sleeve seat 701 which is sealed with the inner wall ring sleeve of the anchor hole sleeve 6, an expansion sealing ring 702 which is sealed with the inner side of the sleeve seat 701 at one end and the outer end face of the anti-seepage sleeve 703 at the other end, and an anti-seepage sleeve 703 which is inserted into the inside of the anchor hole sleeve 6 and the inner end of which is connected to the grouting body 5; the anti-seepage sleeve assembly 7, the anchor hole sleeve 6 and the grouting body 5 are enclosed to form a drainage annular cavity 11 for draining water seepage near the position of the prestressed anchor cable structure; the anchor hole sleeve 6 is provided with a plurality of drainage holes 601 on the inner wall below the drainage annular cavity 11, and the drainage holes The surrounding soil below 601 is replaced with a water filter filler 602; the drainage pipe 10 is obliquely inserted into the slope soil 12, and the higher end of the drainage pipe 10 extends into the water filter filler 602, and the lower end extends to the outside of the slope soil 12; the plugging ring 8 is serially fixed on the steel strand 1 and embedded in the expansion sealing ring 702, so that the surrounding side of the plugging ring 8 is close to the inner wall of the expansion sealing ring 702; the first grouting pipe 9 is arranged in the anchor hole casing 6, and one end thereof seals and passes through the plugging ring 8 to extend into the anti-seepage casing 703, and the other end seals and passes through the outer end side wall of the anchor hole casing 6 and the steel pad 3 to extend to the outside of the slope soil 12;

[0038] In the above structure, the anchor hole sleeve 6, the drainage pipe 10 and the anti-seepage sleeve 703 are all PVC pipes, the diameter of the anti-seepage sleeve 703 is 1-2 cm smaller than that of the anchor hole sleeve 6, and the anti-seepage sleeve 703 is coaxially plugged into the anchor hole sleeve 6; the expansion sealing ring 702 and the plugging ring 8 are made of rubber, so as to ensure that the expansion sealing ring 702 has a certain elasticity, and when the expansion sealing ring 702 is compressed and expanded toward the plugging ring 8, the expansion sealing ring 702 can better fit and seal with the plugging ring 8; the drainage hole 601 is a circular hole with a diameter of 1-1.5 cm; the drainage pipe 10 is inserted into the slope soil 12 at an inclination angle of 5-15°; the diameter of the plugging ring 8 is 0.3-0.5 cm smaller than the diameter of the expansion sealing ring 702 in the natural state; the width of the expansion sealing ring 702 is 1.5-2 times the width of the plugging ring 8;

[0039] Based on the above structural setting, the construction sequence of a leakage-proof slope prestressed anchor cable structure provided in this embodiment is as follows: anchor cable drilling → digging the surrounding soil below the designed position of the drainage hole to form an empty groove for replacing the water filter filler → drilling the drainage pipe installation hole → installing the drainage pipe → backfilling the water filter filler → installing the anchor hole casing and the anti-seepage casing assembly → grouting → waist beam reinforcement → formwork frame installation → waist beam reinforcement installation → waist beam casting;

[0040] The anti-leakage principle of the anti-leakage slope prestressed anchor cable structure provided in this embodiment is as follows: Figure 2, usually when the slope interception and drainage measures are in place, the water in the slope soil 12 will slowly seep into the anchor hole casing from the joint between the anchor hole casing and the grouting body, but the seeped water will first flow into the drainage annular cavity 11 formed by the anti-seepage casing assembly 7, the anchor hole casing 6 and the grouting body 5, and then the drainage annular cavity 11 can be used to store and drain the seepage water from the drainage hole 601 opened on the inner wall below the anchor hole casing 6. The discharged water is filtered by the water filter filler 602 and finally discharged continuously through the drainage pipe 10. In this way, the water in the slope soil 12 will not directly flow into the anchor hole casing and contact the steel strand 1; when the slope hydrogeological conditions are poor and the slope interception and drainage measures are not in place, please refer to Fig. 9 , the water in the slope soil 12 will infiltrate into the anchor hole casing from the joint between the anchor hole casing and the grouting body. At this time, it will be difficult to drain the water in time through the coordinated drainage of the drainage annular cavity 11, the drainage hole 601 and the drainage pipe 10. The drainage annular cavity 11 will be full of seepage water. At the same time, part of the seepage water will infiltrate into the anti-seepage casing 703 from the connection seam between the anti-seepage casing 703 and the grouting body 5 or directly from the grouting body 5. Finally, it can be observed that water is discharged from the first grouting pipe 9, but at this time, the steel strand in the anti-seepage casing 703 will come into contact with water and be corroded; in this case, since the drainage annular cavity 11 is filled with seepage water, in the water Under the action of pressure, the expansion sealing ring 702 will be compressed and expanded toward the sealing ring 8, so that the expansion sealing ring 702 and the sealing ring 8 are sealed together, so that the anti-seepage casing 703, the sealing ring 8 and the grouting body form a sealing section space. At this time, the water in the sealing section space can be quickly pumped out through the first grouting pipe 9, and then grouting is immediately performed through the first grouting pipe 9, so that only the sealing section space is grouted to form a water-stopping grouting body 16, so as to achieve the effect of segmented partial grouting and water-stopping, so that the remaining steel strands in the free section position can still play a prestressed role, so as to ensure the anchoring stability of the slope prestressed anchor cable structure.

[0041] Further, in a specific embodiment, see Figure 3 The outer side surface of the sealing ring 8 is concave inward in an arc shape; based on this structural setting, when the expansion sealing ring 702 is pressurized and expanded toward the sealing ring 8, it presents an arc-shaped convexity, which can fit with the arc-shaped concave structure of the sealing ring 8 to better achieve the sealing effect.

[0042] In order to improve the drainage effect of the drain pipe 10, further, in a specific embodiment, refer to Figure 3 The outer wall of the end of the drainage pipe 10 extending into the water filtering filler 602 is evenly provided with a plurality of water filtering holes 1001 .

[0043] Furthermore, in a specific embodiment, the water filtering filler 602 is made of sand and gravel wrapped with geotextile.

[0044] Further, in a specific embodiment, see Figure 3 The drainage hole 601 is plugged with a foam ball 6011 wrapped with two layers of geotextile.

[0045] Further, in a specific embodiment, see Figure 2 , Figure 8 The present invention also includes a reinforcing ring 13 with a sleeve seal arranged on the outer end surface of the anchor hole sleeve 6, and an inner pad 14 with a sleeve seal arranged outside the reinforcing ring 13; based on this structural setting, when the waist beam steel bars are installed, the reinforcing ring 13 and the inner pad 14 can be pre-buried together to connect the reinforcing ring 13 and the inner pad 14 with the PVC sleeve, and foam glue is used for sealing. When the waist beam concrete is poured, the reinforcing ring 13 and the inner pad 14 can both reinforce the anchor cable hole on the waist beam and provide a construction platform for subsequent anchor cable tensioning and locking.

[0046] Further, in a specific embodiment, see Figure 2 , Figure 8 The first grouting pipe 9 sequentially passes through the outer end side wall of the anchor hole casing 6, the reinforcement ring 13, the inner pad 14 and the steel pad 3 and extends to the outside of the slope soil 12.

[0047] Furthermore, in a specific embodiment, the reinforcement ring 13 and the inner pad 14 are made of cast iron.

[0048] Further, in a specific embodiment, see Figure 2 The present invention also includes a second grouting pipe 14, one end of which passes through the outer end side wall of the anchor hole casing 6 and is connected with the inside of the anchor hole casing 6, and the other end extends to the outside of the slope soil 12; based on the above structure, when grouting and water stopping through a grouting pipe 9 fails, grouting can be performed in the remaining anchor hole casing 6 through the second grouting pipe 14 to perform grouting and water stopping of the entire free end of the anchor cable.

[0049] Since the plugging ring 8 is serially fixed on the steel strand 1, and one end of the first grouting pipe 9 is sealed and penetrates the plugging ring 8 and extends into the anti-seepage casing 703, in order to make the length of the first grouting pipe 9 as a whole retractable so that it can adapt to the slight displacement of the plugging ring caused by the tension of the steel strand 1, further, in a specific embodiment, please refer to Figure 2 The first grouting pipe 9 includes a first hard pipe section 901, a flexible hose section 902 with an extendable length, and a second hard pipe section 903 which are connected in sequence. The first hard pipe section 901 seals and penetrates the sealing ring 8 to extend into the anti-seepage casing 703. The second hard pipe section 903 seals and penetrates the outer end side wall of the anchor hole casing 6 and the steel pad 3 to extend to the outside of the slope soil 12.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above. Moreover, the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A leak-proof prestressed anchor cable structure for slopes, comprising a steel strand (1), an anchor hole (2), a steel backing plate (3), an anchor head (4), a grouting body (5) filled in the anchoring section of the anchor hole (2), and an anchor hole casing (6) arranged in the free section of the anchor hole (2), characterized in that It also includes: an anti-seepage casing assembly (7), a plugging ring (8), a first grouting pipe (9) and a drainage pipe (10); The anti-seepage sleeve assembly (7) comprises a sleeve seat (701) which is sealedly connected to the inner wall ring of the anchor hole sleeve (6), an expansion sealing ring (702) which is sealedly connected to the inner side surface of the sleeve seat (701) at one end and sealedly connected to the outer end surface of the anti-seepage sleeve (703) at the other end, and an anti-seepage sleeve (703) which is inserted into the interior of the anchor hole sleeve (6) and connected to the grouting body (5) at the inner end; the anti-seepage sleeve assembly (7), the anchor hole sleeve (6) and the grouting body (5) are enclosed to form a drainage annular cavity (11) for draining water seepage near the position of the prestressed anchor cable structure; The anchor hole casing (6) is provided with a plurality of drainage holes (601) on the inner wall below the drainage annular cavity (11), and the soil below the drainage holes (601) is replaced with a water filter filler (602); the drainage pipe (10) is obliquely inserted into the slope soil (12), and the higher end of the drainage pipe (10) extends into the water filter filler (602), and the lower end extends outside the slope soil (12); The blocking ring (8) is serially connected and fixed on the steel strand (1) and embedded in the expansion sealing ring (702), so that the peripheral side of the blocking ring (8) is close to the inner side wall of the expansion sealing ring (702); The first grouting pipe (9) is arranged in the anchor hole casing (6), and one end thereof seals and passes through the sealing ring (8) to extend into the anti-seepage casing (703), and the other end seals and passes through the outer end side wall of the anchor hole casing (6) and the steel pad (3) to extend outside the slope soil (12).

2. The anti-leakage prestressed anchor cable structure for slope according to claim 1, characterized in that: The outer side surface of the sealing ring (8) is inwardly concave in an arc shape.

3. The anti-leakage prestressed anchor cable structure for slope according to claim 1, characterized in that: The outer wall of the end of the drainage pipe (10) extending into the water filtering filler (602) is evenly provided with a plurality of water filtering holes (1001).

4. The anti-leakage prestressed anchor cable structure for slope according to claim 1, characterized in that: The water filtering filler (602) is made of sand and gravel wrapped with geotextile.

5. The anti-leakage prestressed anchor cable structure for slope according to claim 1, characterized in that: The drainage hole (601) is plugged with a foam ball (6011) wrapped with two layers of geotextile.

6. The anti-leakage prestressed anchor cable structure for slope according to claim 1, characterized in that: It also comprises a reinforcing ring (13) with a sleeve seal arranged on the outer end surface of the anchor hole sleeve (6), and an inner pad (14) with a sleeve seal arranged outside the reinforcing ring (13).

7. The anti-leakage prestressed anchor cable structure for slope according to claim 6, characterized in that: The first grouting pipe (9) sequentially penetrates the outer end side wall of the anchor hole casing (6), the reinforcement ring (13), the inner pad (14) and the steel pad (3) and extends to the outside of the slope soil (12).

8. The anti-leakage prestressed anchor cable structure for slope according to claim 6, characterized in that: The reinforcement ring (13) and the inner pad (14) are made of cast iron.

9. The anti-leakage prestressed anchor cable structure for slope according to claim 1, characterized in that: It also comprises a second grouting pipe (14), one end of which passes through the outer end side wall of the anchor hole casing (6) and is in communication with the interior of the anchor hole casing (6), and the other end of which extends to the outside of the slope soil (12).

10. The anti-leakage prestressed anchor cable structure for slope according to claim 1, characterized in that: The first grouting pipe (9) comprises a first hard pipe section (901), a flexible hose section (902) and a second hard pipe section (903) which are connected in sequence. The first hard pipe section (901) seals through a plugging ring (8) and extends into an anti-seepage casing (703). The second hard pipe section (903) seals through an outer end side wall of an anchor hole casing (6) and a steel pad (3) and extends to the outside of the slope soil (12).

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