CN113445513B - Soil nail anchor cable structure - Google Patents

Abstract

The invention discloses a soil nail anchor cable structure which comprises a soil nail anchoring device and an anchor cable fixing device, wherein the anchor cable fixing device is arranged on the inner side of the soil nail anchoring device, the soil nail anchoring device comprises a soil nail steel reinforcement cage and a steel pipe retaining wall, the steel pipe retaining wall is arranged on the inner side of the soil nail steel reinforcement cage, the soil nail steel reinforcement cage is fixed in an anchor hole through a soil nail support, and a grouting steel pipe and cement mortar are arranged between the steel pipe retaining wall and the wall of the anchor hole; the anchor cable fixing device comprises an anchor cable, an anchor head and an anchoring device, wherein the anchor cable is arranged on the inner side of the steel pipe retaining wall and is connected with the anchor head, the anchor head is arranged at the expansion end of the steel pipe retaining wall, the anchor head is fixed at the bottom of the anchor hole through a locking mechanism, and the anchoring device is arranged outside the anchor hole; the structure is combined with an original soil body in the slope support, slope landslide or collapse can be effectively prevented, and slope instability caused by natural disasters such as earthquake and the like can be effectively prevented through multi-stage yielding of the anchor cables.

Description

A soil nail anchor cable structure

technical field

The invention relates to the technical field of supporting structures, in particular to a soil nail anchor cable structure.

Background technique

As my country began to popularize prestressed concrete structures in 1956; prestressed structures have passed more than half a century in the history of Chinese architecture. Especially since the 1980s, prestressed concrete structures have been widely used in modern projects such as large public buildings, high-rise and super high-rise buildings, long-span bridges and multi-storey industrial plants. After more than 50 years of hard work and exploration, my country has formed a unique system in the design theory, calculation method, component series, structural system, tension anchor system, prestressed technology, prestressed tendons and concrete materials of prestressed concrete. ; In the construction technology and construction management of prestressed concrete, it has accumulated rich experience, and achieved good economic and social benefits; composite soil nail support is developed on the basis of soil nail support, using It is a support method to improve the stability of the slope based on the foundation pit or slope support, which has been a lot of engineering practice in my country for a long time;

For some areas with poor geological conditions, the traditional composite soil nailing support is no longer applicable: for example, in Yulin, Shaanxi, China, because the stratum is mainly composed of miscellaneous fill, Quaternary Holocene aeolian fine sand, scouring flood It is composed of accumulated fine sand and silt, which leads to obvious differences in the engineering properties of each soil layer in the low-level bearing layer, and uneven compressibility, resulting in the traditional soil nail and anchor structure cannot be well combined with the low-level layer. Under the earth pressure, the overturning and collapse of the slope are very easy to occur; and the existing supporting structures are all rigid supporting structures. In the event of an earthquake or the movement of the bottom layer, due to the violent vibration and deformation of the slope, an instantaneous huge tensile force is generated on the anchor cable. , which may lead to the failure of the anchor cable, threatening the stability and safety of the slope; and various forms of failure occur during earthquakes: such as the most commonly used tension anchor cable, mortar, as a brittle material that can hardly bear tension Under the action of load, it is easy to crack and gradually fail to the depth of the anchoring section; therefore, it is necessary to improve the existing prestressed anchor cable structure of the slope to make it have excellent seismic performance, so as to ensure that the slope can withstand the earthquake during and after the earthquake. security and stability.

SUMMARY OF THE INVENTION

In view of the above-mentioned problems, the present invention aims to provide a soil nail anchor cable structure, which combines the traditional soil nail and anchor cable structure to form a rigid and flexible support structure, which can support the slope on the slope. In the process, the supporting structure is well combined with the undisturbed soil, and the slope is supported, which can effectively prevent the occurrence of slope landslide or collapse. The slope is unstable, and the structure has the characteristics of good supporting effect, large bearing capacity, excellent seismic performance and good stability.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A soil nail anchor cable structure comprises a soil nail anchoring device and an anchor cable fixing device, the anchor cable fixing device is arranged inside the soil nail anchoring device, the soil nail anchoring device comprises a soil nail reinforcement cage and a steel pipe protective wall, the The steel pipe protective wall is arranged on the inner side of the soil nail reinforcement cage, the soil nail reinforcement cage is fixed in the anchor hole through the soil nail bracket, and a grouting steel pipe and cement mortar are arranged between the steel pipe protective wall and the wall of the anchor hole hole; the anchor cable fixing device It includes an anchor cable, an anchor head and an anchoring device. The anchor cable is arranged on the inner side of the steel pipe protective wall, and the end of the anchoring section of the anchor cable is connected to the anchor head through the steel pipe protective wall. The locking mechanism arranged inside the anchor head fixes the anchor head at the bottom of the anchor hole, and the end of the free section of the anchor cable is connected to the anchoring device. fixed.

Preferably, the steel pipe protective wall is formed by connecting multiple sections of steel pipes, a clamping table is arranged on the steel pipe protective wall of the anchor cable anchoring section, and two slits are symmetrically opened at the expansion end of the steel pipe of the last section of the steel pipe protective wall. The slit extends along the direction parallel to the centerline of the steel pipe protective wall, and is used in cooperation with the anchor head.

Preferably, the anchor head includes an anchor plate, a middle plate, an anchor block and an anchor body, the anchor body is a hollow structure, the middle plate is arranged in the anchor body, and the anchor plate and the anchor block are symmetrically arranged in the anchor body. Both ends of the anchor, wherein the anchor plate is connected with the end of the anchor cable, the connecting body of the anchor block extends into the inner cavity of the anchor and is connected with the middle plate, and is also connected to the connecting body of the anchor block. A telescopic slot is provided, and the telescopic slot is used in cooperation with the locking mechanism.

Preferably, the locking mechanism is symmetrically arranged in the inner cavity of the anchor body in a "cross" shape, and includes a movable plate, a connecting shaft, a sickle-shaped positioning knife, a connecting rod and a lock body, and the movable plate is arranged near the anchor plate. One end of the anchor body is provided with a movable groove symmetrically on the movable plate, and a push rod is movably arranged in the movable groove, and the push rod is used in cooperation with the movable groove set on the anchor body. The movable plate is connected, and the other end is connected to the lock body through the sealing plug arranged on the middle table plate. The lock body is arranged in the telescopic groove and moves along the telescopic groove. One foot of the sickle-shaped positioning knife It is connected with the anchor block, the other foot is connected with one end of the connecting rod, and the other end of the connecting rod is connected with the lock body.

Preferably, the anchor cable is a multi-stage yielding anchor cable, including an anchor section and a free end, the anchor section includes a multi-stage anchor cable structure, and the anchor cable includes an anchor plate, a wire frame and a prestressed steel strand, so The anchoring plate is arranged in the clamping table, and the anchoring plate is provided with a penetrating anchor hole and a grouting pipe, and the penetrating anchor hole is symmetrically arranged on the anchoring plate and used in conjunction with the prestressed steel strand; the The wire rack is arranged between two adjacent anchor plates, including a large wire frame and a small wire frame, and the large wire frame and the small wire frame are arranged in a cross.

Preferably, the wire rack is a "star" bracket, including a dividing plate and a connecting plate, and the dividing plate is uniformly welded on the outer side of the connecting plate, and is welded between two adjacent dividing plates. A wire loop is provided, the wire loop is used in conjunction with the prestressed steel strand, and a through hole for the grouting pipe to pass through is also provided in the center of the connecting plate; the prestressed steel strand includes a plurality of Wire bundles.

Preferably, the anchoring device includes a sealing plate, a cover plate, a secondary pressure relief anchor, a primary pressure relief anchor and an anchor nut, the sealing pressure plate is arranged on the outer side of the steel pipe protective wall, and is connected with the cover plate through expansion bolts Connection, the second-level pressure anchor and the first-level pressure anchor are arranged on both sides of the sealing plate, and a pressure gap is formed between the second-level pressure anchor and the first-level pressure anchor. The let-down anchor is arranged in the protective wall of the steel pipe, and the anchor nut is arranged on the outer side of the secondary let-down anchor to fix the prestressed steel strand.

Preferably, the first-level pressure anchors are provided with first-level anchor holes and grouting pipe penetration holes, and the first-level anchor holes are evenly arranged around the grouting pipe penetration holes; the first-level anchor holes It is a trapezoidal anchor hole formed by two symmetrically arranged arc-shaped anchor plates, and the back side of the arc-shaped anchor plate is filled with rubber fillers. The anchoring mechanism includes an anchoring sleeve and an anchoring cylinder that are used in cooperation with each other. The anchoring sleeve is a trapezoidal anchoring sleeve used in cooperation with the first-level anchor hole. Inside the anchoring sleeve, and on the inner side of the arc-shaped anchor sheet, anti-skid patterns are arranged to cooperate with the prestressed steel strands.

Preferably, the secondary pressure anchor is provided with secondary anchor holes and grouting pipe penetration holes, and the secondary anchor holes are evenly arranged around the grouting pipe penetration holes; the secondary anchors The hole is a sleeve cavity arranged in the first anchoring sleeve, and a second-level anchoring mechanism is arranged in the second-level anchoring hole, and the second-level anchoring mechanism is the second anchoring sleeve, and the second anchoring sleeve is The inner side is provided with an anti-skid pattern to cooperate with the prestressed steel strand, and the outer side is provided with an annular pressure thread to cooperate with the pressure thread arranged on the inner cavity of the secondary anchor hole.

Preferably, the second anchoring sleeve is a trapezoidal sleeve used in cooperation with the secondary anchor hole, and a pressure letting through groove is also opened on the second anchoring sleeve, and the pressure letting through groove is parallel to the two Extends in the direction of the centerline of the anchor hole.

The beneficial effects of the present invention are: the present invention discloses a soil nail anchor cable structure, and compared with the prior art, the improvements of the present invention are:

(1) The present invention designs a soil nail anchor cable structure, which combines the traditional soil nail and anchor cable structure to form a rigid and flexible support structure, which can well support the support structure during the slope support process. The protective structure is combined with the undisturbed soil to support the slope, which can effectively prevent the occurrence of slope landslide or collapse, with good supporting effect and high bearing capacity;

(2) When in use, prestress is applied through the anchor cable, and under the action of external prestress, the anchor head interacts with the expansion end of the steel pipe protective wall, and the locking mechanism is opened, so that the sickle-shaped positioning knife is inserted into the side wall of the anchor hole, and the The end of the anchoring section of the anchor cable is locked with the side wall of the anchor hole, which enhances the connection effect between the anchoring structure and the anchor hole, and the anchor cable structure is well fixed; at the same time, when the locking mechanism is opened, the slot is fixed in the anchorage. It is stretched under the pressure of the body, so that the anchor head is connected with the steel pipe protective wall, and a complete supporting structure is formed under the action of prestress, and the undisturbed soil is supported in the anchor hole. It is combined with the undisturbed soil, and the anchor head and the end of the anchoring section of the anchor cable are fixed;

(3) The anchor cable is designed as a multi-stage yielding anchor cable, including an anchoring section and a free end. The anchoring section includes a multi-stage anchor cable structure. When in use, the soil at the corresponding depth is graded and anchored, which can be Effectively prevent the secondary anchor cable from breaking due to the elongation process and pulling out due to excessive external pressure, and through graded anchoring, graded anchoring can be achieved, and the anchoring effect is good. It can effectively support the slope and prevent Slope landslide and collapse can effectively ensure the stability of the slope;

(4) Through the design of the anchoring device, the first-level pressure anchors and the second-level pressure anchors can be used to anchor the prestressed steel strands, and the prestressed steel strands can be anchored in stages, which can support both The static load under high stress can also resist the stress wave dynamic load induced by excavation, blasting, earthquake, etc., and avoid the surrounding rock damage and support caused by the high concentration of static stress and large deformation and the damage of dynamic impact load at the anchoring position. Disasters such as structural instability have the advantages of good supporting effect, large bearing capacity, excellent seismic performance and good stability.

Description of drawings

FIG. 1 is a front view of the soil nail anchor cable structure of the present invention when it is used in slope support.

2 is a cross-sectional view of the soil nail anchor cable structure of the present invention when used in slope support.

Fig. 3 is a partial enlarged view of the soil nail anchor cable structure of the present invention when used in slope support.

FIG. 4 is a schematic structural diagram of the soil nail anchor cable structure of the present invention.

FIG. 5 is a cross-sectional view of the soil nail anchor cable structure of the present invention.

Fig. 6 is a cross-sectional view of the anchor head of the present invention when it is not opened for use.

Fig. 7 is a cross-sectional view of the anchor head of the present invention when the anchor head is opened for use.

FIG. 8 is a schematic view of the structure of the movable plate of the present invention.

9 is a cross-sectional view of the soil nail anchor cable structure A-A of the present invention.

10 is a cross-sectional view of the soil nail anchor cable structure B-B of the present invention.

11 is a cross-sectional view of the soil nail anchor cable structure C-C of the present invention.

Figure 12 is a side view of the anchor plate of the present invention.

Figure 13 is a schematic diagram of the structure of the wire rack of the present invention.

Figure 14 is a cross-sectional view of the anchoring device of the present invention.

FIG. 15 is a cross-sectional view of a first-level yielding anchor of the present invention.

Fig. 16 is a left side view of the primary yielding anchor of the present invention.

Figure 17 is a left side view of the primary anchoring mechanism of the present invention.

Fig. 18 is a cross-sectional view of the secondary pressure-relief anchor of the present invention.

Figure 19 is a left side view of the secondary yielding anchor of the present invention.

Figure 20 is a left side view of the secondary anchoring mechanism of the present invention.

Among them: 1. Steel pipe retaining wall, 11. Slotting, 12. Clamping platform, 2. Anchor cable, 21. Anchor plate, 211. Pass through anchor hole, 22. Wire frame, 221. Separator plate, 222. Connecting plate, 223. Wire ring, 23. Grouting pipe, 24. Prestressed steel strand, 3. Anchor head, 31. Anchor plate, 32. Active groove, 33. Locking groove, 34. Middle plate, 35. Anchor block , 351. expansion groove, 36. sealing plug, 37. anchor, 4. locking mechanism, 41. push plate, 42. movable plate, 421. movable groove, 43. connecting shaft, 44. sickle positioning knife, 45. Connecting rod, 46. Lock body, 5. Anchoring device, 51. Sealing plate, 52. Cover plate, 53. Expansion bolt, 54. Secondary pressure anchor, 541. Primary anchor sleeve, 542. Secondary anchor Hole, 55. First-level let-down anchor, 551. First-level anchor hole, 552. Rubber filler, 553. Curved anchor plate, 56. Anchor sleeve, 57. Second anchor sleeve, 571. Let-through groove , 58. Anchor nut, 59. Anchor cylinder.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention are further described below with reference to the accompanying drawings and embodiments.

Referring to a soil nail anchor cable structure shown in Figures 1-20, it includes a soil nail anchoring device and an anchor cable fixing device. The anchor cable fixing device is arranged inside the soil nail anchoring device to form a soil nail that combines rigidity and flexibility. -Anchor cable support structure; the soil nail anchoring device includes a soil nail reinforcement cage and a steel pipe protection wall 1, the steel pipe protection wall 1 is arranged inside the soil nail reinforcement cage, and the soil nail reinforcement cage is fixed in the anchor hole through the soil nail bracket, A grouting steel pipe and cement mortar are arranged between the steel pipe protective wall 1 and the wall of the anchor hole; the anchor cable fixing device includes an anchor cable 2, an anchor head 3 and an anchoring device 5, and the anchor cable 2 is arranged on the steel pipe protective wall 1. The inner side, and the end of the anchoring section of the anchor cable 2 is connected to the anchor head 3 through the steel pipe protective wall 1. The anchor head 3 is arranged on the expansion end of the steel pipe protective wall 1, and is connected to the steel pipe protective wall 1 by applying prestress. The locking mechanism 4 inside the anchor head fixes the anchor head 3 at the bottom of the anchor hole, realizing the fixation of the end of the anchoring section of the anchor cable 2 in the anchor hole, and the end of the free section of the anchor cable 2 is connected with the anchoring device 5. The anchoring device 5 is arranged outside the anchor hole, and forms self-pulling locking by applying prestress to fix the free end of the anchor cable 2 and the steel pipe protective wall 1, and is provided with cement between the anchoring section of the anchor cable 2 and the steel pipe protective wall 1. mortar.

Preferably, during construction, the steel pipe protective wall 1 is formed by connecting multi-section steel pipes, mainly in the form of casing welding, and a clamping table 12 is provided on the steel pipe protective wall 1 outside the anchoring section of the anchor cable 2, and the steel pipe protective wall 1 The expansion end of the last steel pipe is also symmetrically provided with two slits 11. The slits 11 extend along the direction parallel to the centerline of the steel pipe protective wall 1 and are used in conjunction with the anchor head 3. When in use, the anchor cable is prestressed. Under the action, the slit 11 is stretched under the action of the anchor head 3 to realize the fixation of the steel pipe protective wall 1 in the anchor hole. 3 Fix it so that it is connected under the action of prestress to form an integrated support structure to ensure the integrity of the structure.

Preferably, the anchor head 3 includes an anchor plate 31, a middle plate 34, an anchor block 35 and an anchor body 37, the anchor body 37 is a hollow structure, and the middle plate 34 is arranged in the anchor body 37, so The anchor plate 31 and the anchor block 35 are symmetrically arranged at both ends of the anchor body 37, wherein the anchor plate 31 is connected with the end of the anchor cable 2, and the connecting body of the anchor block 35 extends into the inner cavity of the anchor body 37, and is connected with the anchor body 37. The middle platen 34 is connected, and the connecting body of the anchor block 35 is also provided with a telescopic groove 351, and the telescopic groove 351 is used in cooperation with the locking mechanism 4;

The locking mechanism 4 is symmetrically arranged in the inner cavity of the anchor body 37 in a "cross" shape, and includes a movable plate 42, a connecting shaft 43, a sickle-shaped positioning knife 44, a connecting rod 45 and a lock body 46. The movable plate 42 is provided with In the anchor body 37 near one end of the anchor plate 31, and on the movable plate 42, a movable groove 421 is symmetrically arranged, and a push rod 41 is movably arranged in the movable groove 421, and the push rod 41 is arranged on the anchor body 37. The movable groove 32 is used together, and when the prestress is applied by the anchor cable 2, the anchor head 3 is moved along the axial direction of the steel pipe protective wall 1, so that the slit 11 is stretched under the tension exerted by the anchor body 37. The steel pipe protective wall 1 is positioned, and at the same time when the slit 11 is stretched under the action of the tension exerted by the anchor body 37, since the pipe wall of the steel pipe protective wall 1 acts on the push rod 41, the push rod 41 is pushed to move along the anchor head 3. It moves in the opposite direction, so that the movable plate 42 and the push rod 41 move synchronously, one end of the connecting shaft 43 is connected with the movable plate 42, and the other end is connected with the lock body 46 through the sealing plug 36 arranged on the middle plate 34, The lock body 46 is arranged in the telescopic groove 351, so it drives the lock body 46 to move along the telescopic groove 351. One foot of the sickle-shaped positioning knife 44 is connected to the anchor block 35, and the other foot is connected to the connecting rod. One end of 45 is connected, and the other end of the connecting rod 45 is connected with the lock body 46. The lock body 46 drives the knife body of the sickle-shaped positioning knife 44 to rotate along the locking groove 33 provided on the anchor body 37, so that the sickle-shaped positioning knife 44 is rotated. It is inserted into the undisturbed soil on the side wall of the anchor hole, and is combined with the undisturbed soil to fix the anchor head 3 and the end of the anchoring section of the anchor cable 2.

Preferably, the anchor cable 2 is a multi-stage yielding anchor cable, including an anchoring section and a free end, and the anchoring section includes a multi-stage anchor cable structure. When in use, the soil body of corresponding depth can be anchored in stages. , which can effectively prevent the anchor cable from breaking due to the elongation process and pulling out due to excessive external pressure, and through graded anchoring, graded anchoring can be achieved, the anchoring effect is good, and the slope can be effectively supported to prevent Slope landslide and collapse; the anchor cable 2 includes an anchor plate 21, a wire rack 22 and a prestressed steel strand 24, the anchor plate 21 is arranged in the clamping table 12, and the anchor plate 21 is fixed by the clamping table 12, And the anchor plate 21 is provided with a penetrating anchor hole 211 and a grouting pipe 23, the penetrating anchor hole 211 is symmetrically arranged on the anchor plate 21, and is used in conjunction with the prestressed steel strand 24, that is, the prestressed steel wire is used. The stranded wire 24 passes through the piercing anchor hole 211; the wire frame 22 is arranged between two adjacent anchor plates 21, including a large wire frame and a small wire frame, and the large wire frame and the small wire frame are arranged crosswise , so that the prestressed steel strands 24 erected by the large wire frame and the small wire frame form a wave-shaped structure, which can effectively improve its fixing effect after grouting;

The wire rack 22 is a "star" bracket, including a dividing plate 221 and a connecting plate 222. The dividing plate 221 is uniformly welded on the outer side of the connecting plate 222, and is adjacent to the two dividing plates 221. A wire loop 223 is welded between the wires. The wire loop 223 is used in conjunction with the prestressed steel strand 24. The wire loop 223 is used to erect and fix the prestressed steel strand 24 to prevent it from being entangled during layout. , affecting the stress effect, and at the same time, through the erection of the wire ring 223 on the large wire frame and the small wire frame at the corresponding position, the prestressed steel strand 24 forms a wavy structure. After grouting, it can be effectively improved. For the fixing effect, a through hole for the grouting pipe 23 to pass through is also provided in the center of the connecting plate 222, so as to facilitate the grouting of the anchoring section.

Preferably, in order to ensure the strength of the prestressed steel strand 24, the prestressed steel strand 24 is composed of a plurality of steel wire bundles.

Preferably, in order to fix the end of the prestressed steel strand 24 in stages, the anchoring device 5 includes a sealing plate 51 , a cover plate 52 , a secondary pressure anchor 54 , a primary pressure anchor 55 and an anchor nut 58 , the sealing plate 51 is arranged on the outer side of the steel pipe protective wall 1, and is connected with the cover plate 52 through expansion bolts 53, and the expansion bolts 53 are used to protect the secondary pressure anchor 54 and the primary pressure anchor 55. The second-level pressure anchor 54 and the first-level pressure anchor 55 are arranged on both sides of the sealing plate 51, and a pressure gap is formed between the second-level pressure anchor 54 and the first-level pressure anchor 55, and the pressure gap is formed. The inner prestressed steel strand 24 is in a non-tensioned state and plays a role in letting pressure. The first-level let-down anchor 55 is arranged on the inner side of the steel pipe protective wall 1, and the anchor nut 58 is arranged on the inner side of the second-stage let-down anchor 54. On the outside, the end of the prestressed steel strand 24 is fixed by the anchor nut 58 .

Preferably, the first-level pressure anchor 55 is provided with a first-level anchor hole 551 and a grouting pipe penetration hole, the first-level anchor hole 551 is evenly arranged around the grouting pipe penetration hole, and the prestressed The steel strand 24 is fixed; the first-level anchor hole 551 is a trapezoidal anchor hole formed by two symmetrically arranged arc-shaped anchor plates 553, and the back side of the arc-shaped anchor plate 553 is filled with rubber filler 552, There is also a first-level anchoring mechanism in the first-level anchor hole 551 , and the first-level anchoring mechanism includes an anchoring sleeve 56 and an anchoring cylinder 59 that are used in cooperation with each other. Sleeve, the anchoring cylinder 59 is composed of two arc-shaped anchor sheets that are used in cooperation with each other, and is sleeved in the anchoring sleeve 56, and the inside of the arc-shaped anchor sheet is provided with anti-skid lines and the prestressed steel strands 24 are used in conjunction with the record. When in use, first prestress the prestressed steel strand 24 passing through the primary anchor hole 551, tighten the prestressed steel strand 24, cover the prestressed steel strand 24 with the anchor sleeve 56, and fix the A set of anchoring cylinders 59 is inserted into the sleeve 56 to clamp it with the prestressed steel strand 24 and clamp it in the primary anchor hole 551. When the prestressed steel strand 24 is lost, the deformation or internal When the structure is deformed, the prestressed steel strand 24 is moved along the anchoring section, so that the anchoring cylinder 59 moves to the anchoring section under the action of the prestressed steel strand 24, so that the anchoring cylinder 59 and the anchoring sleeve 56 are tightly interlocked with each other, The anchoring sleeve 56 is moved along the anchoring section, the anchoring sleeve 56 and the arc-shaped anchor plates 553 on both sides are gradually squeezed tightly, and the movement of the anchoring sleeve 56 is prevented by the arc-shaped anchor plates 553, forming a multi-stage anchoring effect, To ensure that the prestressed steel strand 24 is always in a prestressed state, and to avoid the relaxation of the prestressed steel strand 24;

When the first stage makes the anchoring effect of the pressure anchor 55 useless, or the first stage makes the anchoring effect of the pressure anchor 55 insufficient to adapt to the deformation of the prestressed steel strand 24 under the action of external force, the prestress in the pressure gap is made The deformation and tension of the steel strand 24 belong to the secondary anchorage. When the secondary anchorage fails, the prestressed steel strand 24 acts on the secondary pressure anchor 54 .

Preferably, the secondary pressure anchor 54 is provided with a secondary anchor hole 542 and a grouting pipe penetration hole, and the secondary anchor hole 542 is evenly arranged around the grouting pipe penetration hole. The stress steel strand 24 is fixed; the secondary anchor hole 542 is a sleeve cavity provided in the first anchoring sleeve 541, and a secondary anchoring mechanism is provided in the secondary anchor hole 542, and the secondary anchoring The mechanism is the second anchoring sleeve 57. The inner side of the second anchoring sleeve 57 is provided with anti-skid patterns to be used in conjunction with the prestressed steel strand 24. When in use, it is clamped with the prestressed steel strand 24. The second anchoring sleeve The outer side of 57 is provided with an annular pressure-relieving thread, and the annular pressure-relieving thread cooperates with the pressure-relieving thread provided on the inner cavity of the secondary anchor hole 542 , and the second anchor sleeve 57 is matched with the secondary anchor hole 542 The trapezoidal sleeve is used, and the second anchoring sleeve 57 is also provided with a pressure let-through groove 571, and the pressure let-through groove 571 extends in a direction parallel to the centerline of the secondary anchor hole 542, that is, when in use, all the The tensile force of the prestressed steel strand 24 first acts on the anchor nut 58, and under the action of the deformation or tightening force of the prestressed steel strand 24, the anchor nut 58 squeezes the second anchor sleeve 57, so that the second anchoring sleeve 57 is squeezed. The second anchoring sleeve 57 moves along the secondary anchor hole 542, so that under the action of the pressure on the inner wall of the secondary anchor hole 542, the second anchoring sleeve 57 is deformed, the pressure through groove 571 becomes smaller, and the prestressed steel strands are twisted. At the same time, because the outer wall of the second anchoring sleeve 57 is provided with an annular pressure thread and a pressure thread on the secondary anchor hole 542 to engage with each other, under the action of the prestressed steel strand 24, the said The ring-shaped pressure thread will be damaged step by step, and the pressure through groove 571 will gradually become smaller, so as to realize the anchoring effect on the end of the prestressed steel strand 24, and realize three-level and multi-level anchoring.

The three-stage anchoring mechanism of the above-mentioned anchoring device 5 is used to anchor the end of the prestressed steel strand 24, which can not only support the static load under high stress, but also resist the stress wave dynamic load induced by excavation, blasting, earthquake, etc. Due to the highly concentrated static stress and large deformation and the damage of dynamic impact load, the anchoring position leads to the damage and rupture of the surrounding rock and the instability of the supporting structure, and the anchoring effect is good.

The soil nail anchor cable structure of the present invention has the following advantages when in use:

1. The present invention designs a soil nail anchor cable structure, which combines the traditional soil nail and anchor cable structure to form a rigid and flexible support structure, which can well support the slope during the slope support process. The structure is combined with the undisturbed soil to support the slope, which can effectively prevent the occurrence of slope landslide or collapse, with good supporting effect and high bearing capacity;

2. When in use, prestress is applied through the anchor cable, and under the action of external prestress, the anchor head interacts with the expansion end of the steel pipe protective wall, and the locking mechanism is opened, so that the sickle-shaped positioning knife is inserted into the side wall of the anchor hole, and the anchor The end of the anchoring section of the cable is locked with the side wall of the anchor hole, which enhances the connection effect between the anchoring structure and the anchor hole, and fixes the anchoring cable structure well. It is stretched under the pressure of the anchor, so that the anchor head is connected with the steel pipe protective wall, and a complete supporting structure is formed under the action of prestressing, and the undisturbed soil is supported in the anchor hole. Combine with the undisturbed soil to fix the anchor head and the end of the anchoring section of the anchor cable;

3. The anchor cable is designed as a multi-stage yielding anchor cable, including an anchoring section and a free end. The anchoring section includes a multi-stage anchor cable structure. When in use, the soil at the corresponding depth is anchored in stages, which can effectively Prevent the secondary anchor cable from breaking due to the elongation process and pulling out due to excessive external pressure, and through graded anchoring, graded anchoring can be achieved, the anchoring effect is good, and the slope can be effectively supported to prevent edge Slope landslide and collapse can effectively ensure the stability of the slope;

4. Through the design of the anchoring device, the first-level pressure anchors and the second-level pressure anchors can be used to anchor the prestressed steel strands, and the prestressed steel strands can be anchored in grades, which can support high The static load under stress can also resist the stress wave dynamic load induced by excavation, blasting, earthquake, etc., and avoid the damage and rupture of the surrounding rock and the supporting structure caused by the large deformation of the anchoring position due to the highly concentrated static stress and the damage of the dynamic impact load. Instability and other disasters, it has the advantages of good supporting effect, large bearing capacity, excellent seismic performance and good stability.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. The utility model provides a soil nail anchor rope structure which characterized in that: the anchor cable fixing device is arranged on the inner side of the soil nail anchoring device, the soil nail anchoring device comprises a soil nail steel reinforcement cage and a steel pipe retaining wall (1), the steel pipe retaining wall (1) is arranged on the inner side of the soil nail steel reinforcement cage, the soil nail steel reinforcement cage is fixed in an anchor hole through a soil nail support, and a grouting steel pipe and cement mortar are arranged between the steel pipe retaining wall (1) and the wall of the anchor hole; the anchor cable fixing device comprises an anchor cable (2), an anchor head (3) and an anchoring device (5), wherein the anchor cable (2) is arranged on the inner side of the steel pipe retaining wall (1), the tail end of an anchoring section of the anchor cable (2) penetrates through the steel pipe retaining wall (1) to be connected with the anchor head (3), the anchor head (3) is arranged at the expansion end of the steel pipe retaining wall (1), the anchor head (3) is fixed at the bottom of an anchor hole through a locking mechanism (4) arranged inside the anchor head, the tail end of a free section of the anchor cable (2) is connected with the anchoring device (5), and the anchoring device (5) is arranged outside the anchor hole to fix the free end of the anchor cable (2) and the steel pipe retaining wall (1);

the steel pipe retaining wall (1) is formed by connecting a plurality of sections of steel pipes, a clamping table (12) is arranged on the steel pipe retaining wall (1) of the anchoring section of the anchor rope (2), two slits (11) are symmetrically formed in the expansion end of the tail section of the steel pipe retaining wall (1), and the slits (11) extend in the direction parallel to the central line of the steel pipe retaining wall (1) and are matched with the anchor head (3) for use;

the anchor head (3) comprises an anchor plate (31), a middle bedplate (34), an anchor block (35) and an anchor body (37), wherein the anchor body (37) is of a hollow structure, the middle bedplate (34) is arranged in the anchor body (37), the anchor plate (31) and the anchor block (35) are symmetrically arranged at two ends of the anchor body (37), the anchor plate (31) is connected with the tail end of the anchor cable (2), a connecting body of the anchor block (35) extends into an inner cavity of the anchor body (37) and is connected with the middle bedplate (34), a telescopic groove (351) is further arranged on the connecting body of the anchor block (35), and the telescopic groove (351) is matched with the locking mechanism (4) for use;

the locking mechanism (4) is symmetrically arranged in the inner cavity of the anchoring body (37) in a cross shape and comprises a movable plate (42), a connecting shaft (43), a sickle-shaped positioning knife (44), a connecting rod (45) and a lock body (46), wherein the movable plate (42) is arranged in the anchoring body (37) close to one end of the anchoring plate (31), second movable grooves (421) are symmetrically arranged on the movable plate (42), a push rod (41) is movably arranged in the second movable groove (421), the push rod (41) is matched with a first movable groove (32) arranged on the anchoring body (37) for use, one end of the connecting shaft (43) is connected with the movable plate (42), the other end of the connecting shaft passes through a sealing plug (36) arranged on the middle bedplate (34) to be connected with the lock body (46), the lock body (46) is arranged in a telescopic groove (351) and moves along the telescopic groove (351), one side of the sickle-shaped positioning knife (44) is connected with a bottom foot (35), the footing of the other side is connected with one end of a connecting rod (45), the other end of the connecting rod (45) is connected with a lock body (46), and a knife body of a sickle-shaped positioning knife (44) is driven by the lock body (46) to rotate along a locking groove (33) arranged on the anchoring body (37).

2. The soil nailing anchor cable structure of claim 1, wherein: the anchor cable (2) is a multi-stage yielding anchor cable and comprises an anchoring section and a free end, the anchoring section comprises a multi-stage anchor cable structure, the anchor cable (2) comprises an anchoring plate (21), a wire frame (22) and a prestressed steel strand (24), the anchoring plate (21) is arranged in the clamping table (12), a cross-connecting anchor hole (211) and a grouting pipe (23) are arranged on the anchoring plate (21), and the cross-connecting anchor hole (211) is symmetrically arranged on the anchoring plate (21) and is matched with the prestressed steel strand (24) for use; the thread frames (22) are arranged between two adjacent anchoring plates (21) and comprise large thread frames and small thread frames which are arranged in a crossed mode.

3. The soil nailing anchor cable structure of claim 2, wherein: the wire frame (22) is a star-shaped support and comprises wire separating plates (221) and a connecting plate (222), the wire separating plates (221) are uniformly welded on the outer side of the connecting plate (222), a wire frame ring (223) is welded between every two adjacent wire separating plates (221), the wire frame ring (223) is matched with a prestressed steel strand (24) for use, and a through hole for a grouting pipe (23) to pass through is further formed in the center of the connecting plate (222); the prestressed steel strand (24) comprises a plurality of steel wire bundles.

4. The soil nailing anchor cable structure of claim 2, wherein: anchoring device (5) including holding down plate (51), apron (52), second grade let press anchor assembly (54), one-level let press anchor assembly (55) and anchor nut (58), holding down plate (51) sets up in the outside of steel pipe dado (1), and is connected through expansion bolts (53) with apron (52), the second grade lets press anchor assembly (54) and one-level let press anchor assembly (55) and sets up in the both sides of holding down plate (51), lets to press anchor assembly (54) and one-level to let to press and form between anchor assembly (55) at the second grade, the one-level lets to press anchor assembly (55) to set up in steel pipe dado (1), anchor nut (58) set up in the outside that the second grade let press anchor assembly (54), fix prestressing force cable (24).

5. The soil nailing anchor cable structure of claim 4, wherein: the primary yielding anchoring part (55) is provided with a primary anchor hole (551) and a grouting pipe through hole, and the primary anchor hole (551) is uniformly arranged around the grouting pipe through hole; the primary anchor hole (551) is a trapezoidal anchor hole formed by two arc-shaped anchor plates (553) which are symmetrically arranged, rubber filler (552) is filled on the back side of each arc-shaped anchor plate (553), a primary anchor mechanism is further arranged in each primary anchor hole (551), each primary anchor mechanism comprises an anchor sleeve (56) and an anchor cylinder (59) which are matched with each other, each anchor sleeve (56) is a trapezoidal anchor sleeve matched with the corresponding primary anchor hole (551), each anchor cylinder (59) is composed of two arc-shaped anchor sheets matched with each other, each anchor sleeve is sleeved in each anchor sleeve (56), and anti-skid grains are arranged on the inner sides of the corresponding arc-shaped anchor sheets to be matched with the corresponding prestress steel strands (24).

6. The soil nailing anchor cable structure of claim 4, wherein: the secondary yielding anchoring piece (54) is provided with a secondary anchor hole (542) and a grouting pipe through hole, and the secondary anchor hole (542) is uniformly arranged around the grouting pipe through hole; second grade anchor eye (542) are for setting up the sleeve chamber in first anchor sleeve (541), and are provided with second grade anchor mechanism in second grade anchor eye (542), second grade anchor mechanism is second anchor sleeve (57), the inboard of second anchor sleeve (57) is provided with anti-skidding line and prestress wire (24) cooperation and uses, and the outside is provided with the annular and lets pressure screw thread and set up the cooperation of letting pressure screw thread on second grade anchor eye (542) inner chamber and use.

7. The soil nailing anchor cable structure of claim 6, wherein: the second anchoring sleeve (57) is a trapezoidal sleeve matched with the second-level anchor hole (542) for use, a yielding through groove (571) is further formed in the second anchoring sleeve (57), and the yielding through groove (571) extends in the direction parallel to the center line of the second-level anchor hole (542).

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