Leakage-proof slope prestressed anchor cable structure

Abstract

The application discloses a kind of anti-leakage side slope prestressed anchor cable structures, including steel strand, anchor hole, steel backing plate, anchor head, grouting body filled in anchor hole anchoring section, anchor hole sleeve is set in the free section of anchor hole, it is characterized by further comprising: anti-seepage sleeve assembly, sealing ring, first grouting pipe, drain pipe;The anti-seepage sleeve assembly includes sleeve seat with the ring sleeve sealing connection of anchor hole sleeve inner wall, one end with the inside of sleeve seat sealing connection, the other end with the outer end surface sealing connection of anti-seepage sleeve, the anti-seepage sleeve of insertion in anchor hole sleeve inside, inner end is connected with grouting body;The anti-seepage sleeve assembly is formed with anchor hole sleeve, grouting body and encloses the drainage annular cavity for the water seepage of prestressed anchor cable structure position nearby is conducted and is arranged.The application solves the problem that existing side slope prestressed anchor cable leakage water is difficult to handle.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of prestressed anchor cable and specifically discloses a seepage-proof slope prestressed anchor cable structure. BACKGROUND

[0002] Generally, water seepage in anchor cable holes is a common construction quality problem after the completion of tension locking of the slope prestressed anchor cable. Under the condition that the hydrogeological condition of the slope is poor and the slope cutting and drainage measures are not in place, water seepage in the prestressed anchor cable is prone to occur, and the water flows out through the channel formed by the anchor cable drilling hole, which may cause early corrosion and even rust failure of the anchor cable. After the water seepage in the slope prestressed anchor cable, the hole is usually plugged by punching and grouting, and the treatment cost is high, and secondary water seepage is prone to occur. SUMMARY

[0003] In view of the above problems, the application provides a seepage-proof slope prestressed anchor cable structure, which solves the problem that the water seepage in the existing slope prestressed anchor cable is difficult to handle.

[0004] The application is achieved by the following technical scheme.

[0005] A seepage-proof slope prestressed anchor cable structure, comprising a steel strand, an anchor hole, a steel backing plate, an anchor head, a grouting body filled in the anchoring section of the anchor hole, and an anchor hole sleeve arranged in the free section of the anchor hole, characterized in that the seepage-proof slope prestressed anchor cable structure further comprises a seepage-proof sleeve assembly, a plugging ring, a first grouting pipe and a drainage pipe.

[0006] The seepage-proof sleeve assembly comprises a sleeve seat in sealing connection with the inner wall of the anchor hole sleeve, an expansion sealing ring in sealing connection between the inner side of the sleeve seat and the outer end surface of the seepage-proof sleeve, and the seepage-proof sleeve inserted into the inside of the anchor hole sleeve and connected with the grouting body; the seepage-proof sleeve assembly, the anchor hole sleeve and the grouting body form a drainage annular cavity for guiding and draining the water seepage near the position of the prestressed anchor cable structure.

[0007] A plurality of drainage holes are formed in the lower inner wall of the anchor hole sleeve at the position of the drainage annular cavity, and a water filtering filler is arranged in the surrounding soil body below the drainage holes; the drainage pipe is obliquely inserted into the slope soil body, and the higher end of the drainage pipe extends into the water filtering filler and the lower end extends out of the slope soil body.

[0008] The plugging ring is fixed in series on the steel strand and embedded in the ring of the expansion sealing ring, so that the peripheral side of the plugging ring is close to the inner side wall of the ring of the expansion sealing ring.

[0009] The first grouting pipe is arranged in the anchor hole sleeve, and one end of the first grouting pipe extends into the seepage-proof sleeve through the plugging ring in a sealing manner, and the other end of the first grouting pipe extends out of the slope soil body through the outer end side wall of the anchor hole sleeve and the steel backing plate in a sealing manner.

[0010] Preferably, the outer side of the sealing ring is concave inwards 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 holes are plugged with foam balls wrapped with two layers of geotextile.

[0014] Preferably, the present invention further comprises a reinforcing ring provided with a sleeve seal on the outer end surface of the anchor hole casing, and an inner pad provided 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 communicates with the interior of the anchor hole casing, and the other end of which extends to the outside of the slope soil.

[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 passes through the sealing ring to extend into the anti-seepage casing. The second hard pipe section seals and passes through the outer end side wall of the anchor hole casing and the steel base plate to extend outside the slope soil.

[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 sleeve assembly and a drainage pipe to the traditional slope prestressed anchor cable structure, so that when slow water leakage occurs in the prestressed anchor cable hole in the later stage, the drainage annular cavity formed by the anti-seepage sleeve assembly, the anchor hole sleeve, 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 sleeve and contact the steel strand, thereby effectively preventing rust or even rust breakage.

[0021] 2) When the prestressed anchor structure leaks, the existing treatment method is usually to fill the grouting body into the free section of the anchor hole casing by punching, but at the same time of realizing the grouting water stop, the steel strand in the free section will not play the prestress role. The expansion sealing ring and the plugging ring are arranged in the application, when the drainage capacity of the drainage ring cavity, the drainage hole and the drain pipe is insufficient, the expansion sealing ring will be filled with water under the action of water pressure, and the expansion sealing ring will be pressed towards the plugging ring and expanded and extruded, so that the expansion sealing ring and the plugging ring are sealed, so that the anti-seepage casing, the plugging ring and the grouting body form a sealed section space, so that the first grouting pipe can quickly grout water stop in the sealed section space, so as to achieve the effect of sectional partial grouting water stop, so that the remaining steel strand in the free section can still play the prestress role, so as to ensure the anchoring stability of the slope prestressed anchor structure. BRIEF DESCRIPTION OF DRAWINGS

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

[0023] Figure 2 is a structural schematic diagram of the slope prestressed anchor structure of the application;

[0024] Figure 3 is Figure 2 is an enlarged schematic view of C in

[0025] Figure 4 is Figure 2 is a sectional view of A-A in

[0026] Figure 5 is a sectional view of B-B in Figure 2

[0027] is a sectional view of B-B in Figure 6

[0028] is a sectional view of B-B in Figure 7

[0029] is a sectional view of B-B in Figure 8

[0030] is a sectional view of B-B in Figure 9

[0031] ​The meanings of the respective marks in the above figures are as follows: steel strand 1, anchor hole 2, steel backing plate 3, anchor head 4, grouting body 5, anchor hole sleeve 6, drainage hole 601, foam ball 6011, water filtering filler 602, anti-seepage sleeve assembly 7, sleeve seat 701, expansion sealing ring 702, anti-seepage sleeve 703, sealing ring 8, first grouting pipe 9, first hard pipe section 901, soft pipe section 902, second hard pipe section 903, drainage pipe 10, drainage annular cavity 11, slope soil body 12, reinforcing ring 13, inner backing plate 14, waist beam 15, water-stopping grouting body 16. DETAILED DESCRIPTION

[0032] The application will be further described below in the form of specific embodiments with reference to the accompanying drawings. It should be pointed out that the following embodiments are only illustrative explanations of the application by way of example, and the protection scope of the application is not limited to this. The described embodiments are only some of the embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0033] Embodiment 1

[0034] This embodiment provides a kind of slope prestressed anchor structure, it is common in prior art anchor structure, please refer to Figure 1 , it includes steel strand 1, anchor hole 2, steel backing plate 3, anchor head 4, grouting body 5 filled in anchor hole 2 anchoring section and the anchor hole sleeve 6 being arranged in the free section of anchor hole 2.This embodiment slope prestressed anchor structure in use, such as meeting poor hydrogeological conditions, slope section, drainage measures are not in place and the like, prestressed anchor leakage is prone to occur, especially the water in slope soil body is easy to directly seep into anchor hole sleeve from the joint of anchor hole sleeve and grouting body, so that water flows out through the channel formed by anchor hole sleeve, which may cause early corrosion of anchor even rust failure, thereby potential safety hazards such as slope instability may occur.In the existing slope prestressed anchor structure, if anchor structure seepage phenomenon occurs, usually drilling grouting form is used for plugging, not only the processing cost is high, and secondary leakage is prone to occur;In order to ensure the grouting water-stopping effect, grouting body can be filled in the anchor hole sleeve 6 of free section, but it will affect the prestressed effect of free section steel strand.

[0035] Embodiment 2

[0036] This embodiment provides a kind of anti-seepage slope prestressed anchor structure, please refer to Figures 2 to 8 , it further includes: anti-seepage sleeve assembly 7, sealing ring 8, first grouting pipe 9 and drainage pipe 10 on the basis of embodiment 1;

[0037] Wherein: the anti-seepage sleeve assembly 7 includes a sleeve seat 701 that is sealed with the inner ring of the anchor hole sleeve 6, an expansion sealing ring 702 that 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 that 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 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 blocking ring 8 is serially fixed to the steel strand 1 and embedded in the expansion sealing ring 702, so that the surrounding 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 set in the anchor hole casing 6, and one end thereof seals and passes through the blocking 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 inserted into the anchor hole sleeve 6; the expansion sealing ring 702 and the blocking ring 8 are made of rubber, so as to ensure that the expansion sealing ring 702 has a certain elasticity and can better fit and seal with the blocking ring 8 when the expansion sealing ring 702 is compressed and squeezed toward the blocking 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 blocking 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 blocking ring 8;

[0039] Based on the above structural setting, the construction sequence of the anti-leakage slope prestressed anchor cable structure provided in this embodiment is as follows: anchor cable drilling → excavating 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 → planting the waist beam reinforcement → installing the formwork frame → installing the waist beam reinforcement → casting the waist beam;

[0040] The anti-leakage principle of the anti-leakage slope prestressed anchor cable structure provided in this embodiment is as follows: Figure 2, generally in the case of slope intercept, drainage measures in place, the water in the slope soil 12 will slowly seep into the anchor hole sleeve from the joint between the anchor hole sleeve and the grouting body, but the seepage water will first flow into the drainage annular cavity 11 formed by the anti-seepage sleeve assembly 7, the anchor hole sleeve 6 and the grouting body 5, and then the accumulation and drainage of the drainage annular cavity 11 can be utilized to discharge the seepage water from the drainage hole 601 opened in the inner wall below the anchor hole sleeve 6, and the discharged water is filtered by the water filtering filler 602 and finally discharged continuously through the drainage pipe 10, so that the water in the slope soil 12 will not directly flow into the anchor hole sleeve and contact the steel strand 1; when the slope hydrogeological conditions are poor and the slope intercept, drainage measures are not in place, please refer to Figure 9 , the water in the slope soil 12 will seep into the anchor hole sleeve from the joint between the anchor hole sleeve and the grouting body, at this time it will be difficult to discharge the water in time through the cooperation of the drainage annular cavity 11, the drainage hole 601 and the drainage pipe 10, and the seepage water will fill the drainage annular cavity 11, and at the same time a part of the seepage water will seep into the anti-seepage sleeve 703 from the joint between the anti-seepage sleeve 703 and the grouting body 5 or directly from the grouting body 5, and finally the water can be observed to be discharged from the first grouting pipe 9, but at this time the steel strand in the anti-seepage sleeve 703 will be in contact with the water and be eroded; in this case, due to the fact that the drainage annular cavity 11 is filled with seepage water, the water pressure will cause the expansion sealing ring 702 to be pressed and expand towards the blocking ring 8, and then the expansion sealing ring 702 and the blocking ring 8 are sealed, so that the anti-seepage sleeve 703, the blocking ring 8 and the grouting body form a sealed segment space, at this time the water in the sealed segment space can be quickly pumped away through the first grouting pipe 9, and then grouting is immediately injected through the first grouting pipe 9, so that only the grouting in the sealed segment space forms a water-stopping grouting body 16, so as to achieve the effect of sectional partial grouting water stopping, so that the remaining steel strand at the free segment position can still play a role of prestress to ensure the anchoring stability of the slope prestressed anchor structure.

[0041] Further, in a specific embodiment, please refer to Figure 3 , the outer side of the blocking ring 8 is recessed inwardly in an arc shape; based on this structure, when the expansion sealing ring 702 is pressed and expands towards the blocking ring 8, it is arc-shaped and protruding, which can better achieve the sealing effect by fitting with the arc-shaped recessed structure of the blocking ring 8.

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

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

[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 on the outside of 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 to 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 on the entire free end of the anchor cable.

[0049] Since the blocking ring 8 is fixed in series on the steel strand 1, and one end of the first grouting pipe 9 is sealed and passes through the blocking 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 blocking 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 connected in sequence. The first hard pipe section 901 seals and passes through the sealing ring 8 to extend into the anti-seepage casing 703. The second hard pipe section 903 seals and passes through the outer end side wall of the anchor hole casing 6 and the steel base plate 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. Furthermore, the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations coming within the meaning and range of equivalents of the claims be embraced therein.

[0051] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 can also be appropriately combined to form other implementation methods 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) grouting 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 blocking ring (8), a first grouting pipe (9) and a drainage pipe (10); The anti-seepage sleeve assembly (7) comprises a sleeve seat (701) hermetically connected to the inner wall of the anchor hole sleeve (6), an expansion sealing ring (702) having one end hermetically connected to the inner side of the sleeve seat (701) and the other end hermetically connected to the outer end face of the anti-seepage sleeve (703), and an anti-seepage sleeve (703) inserted into the interior of the anchor hole sleeve (6) and having its inner end connected to the grouting body (5); the anti-seepage sleeve assembly (7), the anchor hole sleeve (6), and the grouting body (5) enclose 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 surrounding 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 upper 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 connected in series and fixed to the steel strand (1) and embedded in the expansion sealing ring (702), so that the circumference 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 is sealed and penetrates the sealing ring (8) to extend into the anti-seepage casing (703), and the other end is sealed and penetrates 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 of the sealing ring (8) is concave inwards 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 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).

7. The anti-leakage prestressed anchor cable structure for slope according to claim 6, characterized in that: 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).

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 includes a second grouting pipe (14), one end of which passes through the outer end side wall of the anchor hole sleeve (6) and is connected to the interior of the anchor hole sleeve (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) is sealed through the sealing ring (8) and extends into the anti-seepage casing (703). The second hard pipe section (903) is sealed through the outer end side wall of the anchor hole casing (6) and the steel pad (3) and extends to the outside of the slope soil (12).

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