CN114561962A

CN114561962A - Double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system

Info

Publication number: CN114561962A
Application number: CN202210140614.4A
Authority: CN
Inventors: 凌贤长; 胡意如; 杨忠年; 唐亮; 刘齐辉; 黄腾; 陈宏伟; 王奕翔; 陈岩
Original assignee: Qingdao Panyao New Material Engineering Research Institute Co ltd; Harbin Institute of Technology
Current assignee: Qingdao Panyao New Material Engineering Research Institute Co ltd; Harbin Institute of Technology
Priority date: 2022-02-16
Filing date: 2022-02-16
Publication date: 2022-05-31

Abstract

The invention relates to the field of slope engineering, in particular to an assembled double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system. The prefabricated double-wall retaining wall is formed by connecting a plurality of prefabricated double-wall building block monomers which are sequentially arranged along the horizontal direction and the vertical direction; the prefabricated double-wall retaining wall is filled with a deformation absorption layer, and the injection type vacuum anchor cable is connected with the prefabricated double-wall retaining wall. The slope reinforcement system is characterized in that a large-rigidity assembly type retaining wall and an injection type vacuum anchor cable are stressed cooperatively, so that a slope reinforcement system with rigidity and flexibility and extremely strong integrity is formed, and slope instability damage is effectively prevented and controlled.

Description

Double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system

Technical Field

The invention relates to the field of slope engineering, in particular to an assembled double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system.

Background

The periodic change of the cold region temperature has a great influence on the slope stability, and the freeze-thaw cycling action causes various diseases of the cold region slope, such as slope freeze-thaw collapse damage, frost heaving damage and the like, and seriously harms the safety and stability of the cold region slope. Meanwhile, in the southwest region, earthquakes are frequent, the slope protection structure is deeply disturbed by earthquakes, and diseases such as dumping and collapse are frequently caused. Therefore, it is necessary to provide effective protection and reinforcement for the slope in cold regions and southwest regions.

Assembled retaining wall has widely been applied to side slope support, but this type of slope protection structure is whole better, nevertheless to the bank protection foundation requirement than higher to this type of integral bank protection belongs to rigid structure, in case suffer cold district freeze thawing cycle and earthquake damage, after the inhomogeneous deformation of basis exceeded a definite quantity, slope protection structure often can appear destruction such as crack, can appear wholly collapsing the phenomenon even, has not only influenced the stability of side slope, has caused economic loss again.

In conclusion, it is necessary to provide an assembled rigid and flexible slope protection system which can meet frost heaving and spring thawing deformation in cold regions, has a rigid structure and a flexible component in the system, can better coordinate slope deformation, and can be constructed in winter.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system, which makes full use of the cooperative stress of a high-rigidity assembly type retaining wall and an injection type vacuum anchor cable to form a side slope reinforcement system with rigidity and flexibility and strong integrity, and effectively prevents and controls the side slope instability damage.

The technical scheme of the invention is as follows: a double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system comprises a prefabricated double-wall retaining wall, injection type vacuum anchor cables, a deformation absorption layer and a geogrid net, wherein the prefabricated double-wall retaining wall is arranged along a direction parallel to a side slope and is formed by connecting a plurality of prefabricated double-wall building block monomers which are sequentially arranged along the horizontal direction and the vertical direction; the prefabricated double-wall retaining device is filled with a deformation absorption layer, and the injection type vacuum anchor cable is connected with the prefabricated double-wall retaining wall;

the prefabricated double-wall building block single body comprises a prefabricated double-wall building block single body front wall and a prefabricated double-wall building block single body rear wall, a reserved anchor cable hole is formed in the prefabricated double-wall building block single body rear wall, and the front portion of the injection type vacuum anchor cable penetrates through the reserved anchor cable hole;

the injection type vacuum anchor cable comprises an anchor cable body, an anchoring nut, a metal piston disc, a sealing washer, a substrate, an annular anchoring body and a guide pipe, wherein one end of the annular anchoring body is fixedly connected with the substrate, the other end of the annular anchoring body is connected with the guide pipe, through holes are formed in the centers of the annular anchoring body and the substrate, the anchor cable body sequentially penetrates through the guide pipe, the annular anchoring body and the substrate, an annular cavity is formed in the annular anchoring body, the diameter of the annular cavity is larger than that of the anchor cable body, the annular anchoring body and the substrate form an anchoring area, and the size of the annular anchoring body is larger than that of a reserved anchor cable hole;

the anchor cable body is characterized in that a metal piston disc is arranged on the outer side of the base plate, a through hole I for the anchor cable body to pass through is formed in the center of the metal piston disc, a sealing sleeve I is fixed on the annular outer side of the metal piston disc, an anchoring nut is arranged on one side, away from the base plate, of the metal piston disc, the metal piston disc is fixedly connected with the anchoring nut, external threads are formed in the outer surface of the anchor cable body, and threaded connection is formed between the internal threads of the anchoring nut and the external threads of the anchor cable body;

a sealing washer is arranged between the metal piston disc and the substrate, a through hole II for the anchor cable body to pass through is formed in the center of the sealing washer, the annular outer side face of the sealing washer is in interference fit sealing connection with the inner side face of the sealing sleeve I, a sealing lip is arranged at one end, facing the substrate, of the sealing washer and located on the outer side of the sealing sleeve I, and the sealing lip is used for achieving sealing between the sealing washer and the substrate;

a capsule storage cavity is arranged between the metal piston disc and the sealing washer, a dry pulp capsule is arranged in the capsule storage cavity, and the dry pulp capsule comprises a synthetic resin film on the outer layer and contents in the synthetic resin film;

the metal piston disc includes hanging wall and shutoff flabellum, be equipped with the shutoff flabellum of several crescent between hanging wall and the capsule storage chamber, the shutoff flabellum sets up along the even interval of circumference of hanging wall, the one end of shutoff flabellum and the medial surface fixed connection of sealing sleeve I, the other end of shutoff flabellum and the lower fixed surface of hanging wall are connected, seal ring is equipped with several stirring microcolumn along its circumference towards the terminal surface of metal piston disc, the last dish that corresponds is equipped with several layers of annular recess towards seal ring one side, the one end and the seal ring fixed connection of stirring microcolumn, the other end inserts in the recess, the internal surface of recess is equipped with the annular polyester film who contains the thixotropic agent, the interval is equipped with the several exhaust hole on the hanging wall.

According to the invention, a sealing sleeve II is arranged on the outer side of the sealing sleeve I, one end of the sealing sleeve II is fixedly connected with a base plate, and the sealing sleeve I is arranged in the sealing sleeve II in a sliding manner.

Two-layer inside and outside stirring microcolumn is equipped with along seal ring's circumference, and every layer is including the stirring microcolumn that the even interval of several set up, and the free end of stirring microcolumn is the arc, and the cross sectional shape who corresponds the recess is the arc, is favorable to realizing the contact between stirring microcolumn and the recess.

The prefabricated double-wall building block single body comprises a prefabricated double-wall building block single body front wall and a prefabricated double-wall building block single body rear wall, the prefabricated double-wall building block single body front wall and the prefabricated double-wall building block single body rear wall are prefabricated by concrete and reinforcing steel bars, the prefabricated double-wall building block single body front wall and the prefabricated double-wall building block single body rear wall are arranged in parallel, the front wall of the single prefabricated double-wall building block is fixedly connected with the rear wall of the single prefabricated double-wall building block, a rubber rib plate is arranged in a gap between the front wall of the single prefabricated double-wall building block and the rear wall of the single prefabricated double-wall building block, the thickness of the front wall of the single prefabricated double-wall building block is greater than that of the rear wall of the single prefabricated double-wall building block, filling large-particle-size broken stones into a gap formed by the front wall of the single prefabricated double-wall building block, the rear wall of the single prefabricated double-wall building block and the rubber rib plate and a gap formed by two adjacent single prefabricated double-wall building blocks to form a deformation absorption layer;

the bottom of the rear wall of the single prefabricated double-wall building block is fixedly connected with an extension plate, the extension plate is located behind the rear wall of the single prefabricated double-wall building block, a geogrid net is fixed to the rear side of the extension plate, and the geogrid net is fixed in a soil layer through a closed countersunk rivet.

The top surface of the single front wall of the prefabricated double-wall building block is provided with a plurality of positioning holes, the bottom surface of the single front wall of the prefabricated double-wall building block is correspondingly fixed with a plurality of limiting bulges, and when the prefabricated double-wall building block is assembled from top to bottom, the positioning holes on the top surface of the single top surface of the lower prefabricated double-wall building block are just inserted into the limiting bulges on the bottom surface of the single bottom of the upper prefabricated double-wall building block, so that the positioning connection between the single upper prefabricated double-wall building block and the single lower prefabricated double-wall building block is realized.

A plurality of horizontal PVC grouting hose holes and vertical PVC grouting hose holes are formed in the front wall of the single prefabricated double-wall building block and the rear wall of the single prefabricated double-wall building block;

the side surface and the top surface of the single front wall of the prefabricated double-wall building block are respectively provided with a plurality of elastic rubber gaskets, and one side of the rear side wall of the single front wall of the prefabricated double-wall building block is fixed with a guide sliding block.

The synthetic resin film is made of polyester fibers or epoxy resin, the content is curable slurry, and the content comprises: 40% -75% of calcium aluminium sulphate based hydraulic cement; 35% -60% of mineral filler, wherein the mineral filler is sand; 0.02-5% of a thixotropic agent, wherein the thixotropic agent is a cellulose-based colloid agent; 0.02% to 5% of a superplasticiser based on melamine sulphonate; 0.02-5% of air entraining agent, wherein the air entraining agent adopts fatty acid, resin acid and salt thereof.

The invention has the beneficial effects that:

the prefabricated double-wall building block adopted by the application has the following advantages:

(1) the shock resistance is strong: because the rib plates adopt flexible structures, the stress generated by the wall body resisting dynamic soil pressure during earthquake can be reduced, and the retaining wall is prevented from cracking and collapsing. In addition, the non-uniform settlement of the wall back soil in the frost heaving period and the spring melting period in the seasonal frozen soil area has followability, so that the integral stability of the retaining wall is ensured;

(2) the economic benefit is good: because the box-type building blocks use less concrete, steel bars, templates and the like, the construction period can be greatly shortened, and the cost is reduced;

(3) the slope design can be strutted according to required to the antetheca monomer and the back wall monomer inclination of prefabricated double-walled building block, and the flexibility is stronger than traditional tilting retaining wall and large-scale building block, and is all better to the adaptability of high steep side slope and gravel side slope, and construction speed is fast and the degree of difficulty is low, is a better emergent means of dealing with of landslide.

(4) After the gaps are filled with the large-particle-size single-granularity macadam, the anti-overturning capability of the macadam is strong, and the like, so that the macadam can bear larger soil pressure and improve the overall stability of the retaining wall;

the injection type vacuum anchor cable adopted by the application has the advantages that the vacuum environment is arranged in the cylinder, the atmospheric pressure is arranged outside the cylinder, on one hand, larger suction is generated, the slope stability is better maintained, on the other hand, the anchor cable is difficult to pull out in the frost heaving period, the deformation can be buffered in the frost heaving period and the freeze thawing period, the system reliability is improved, the injection type vacuum anchor cable reduces or prevents frost heaving displacement in the severe cold period, and in the spring thawing period, the injection type vacuum anchor cable reversely moves a sunken supporting structure to the original position when the slope collapses;

one end of the injection type vacuum anchor cable is tightly buckled with a reserved mounting hole of a prefabricated double-wall soil retaining structure, and the other end of the injection type vacuum anchor cable is driven into a slope stable rock soil layer, so that on one hand, a rock body can be reinforced, the stress of the double-wall soil retaining structure is improved, and on the other hand, the integrity and the strength of a system can be increased;

the large-particle-size gravel layer is used as a deformation absorption layer, the high water drainage performance of the deformation absorption layer ensures the stability of back soil in the spring fusion period, the frost heaving period can be used as a deformation buffer layer, the soil retaining unit resists soil pressure in the earthquake, the generated strain can be dispersed through the deformation absorption layer, and the deformation absorption layer has coordination on unequal settlement of foundation and back soil, so that the stability of the whole retaining wall is maintained;

in summary, the method is suitable for railway engineering, highway engineering and other types of slope engineering with protection and reinforcement requirements in cold regions and southwest regions.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a single prefabricated double wall block;

FIG. 3 is a schematic structural view of a single front wall of a prefabricated double wall block;

FIG. 4 is a schematic structural view of a single rear wall of a prefabricated double wall block;

FIG. 5 is a schematic structural diagram of a single body rear wall of a prefabricated double-wall building block provided with an injection type vacuum anchor cable;

FIG. 6 is a schematic view of the assembly of the single front wall of a prefabricated double wall block and the single rear wall of a prefabricated double wall block;

FIG. 7 is a schematic front view of a single block of prefabricated double wall blocks;

FIG. 8 is a schematic diagram of the right side view of the single prefabricated double wall block;

FIG. 9 is a schematic top view of a single prefabricated double wall block;

FIG. 10 is a reinforcement view of a single prefabricated double wall block;

FIG. 11 is a schematic top view of a portion of a woodworking grating net;

FIG. 12 is a front view of a plurality of prefabricated double-wall retaining walls;

fig. 13 is a schematic cross-sectional view of an injection vacuum anchor cable;

FIG. 14 is a schematic bottom view of the metallic piston disc;

FIG. 15 is a schematic top view of the sealing gasket;

FIG. 16 is a schematic cross-sectional view of the metal piston disk, capsule storage chamber and sealing gasket;

FIG. 17 is a schematic view of the structure of the plugging fan blade, the metal piston disc and the sealing washer in the anchoring state;

FIG. 18 is a schematic view of the construction of a metal piston disc and dry slurry capsule in an initial state;

FIG. 19 is a schematic view of an injection vacuum cable installation;

FIG. 20 is a schematic view of a dry pulp capsule.

In the figure: 1, an anchor cable body; 3 a metal piston disc; 4 an anchor nut; 5, a through hole I; 6 a capsule storage chamber; 7 sealing the gasket; 8 a substrate; 9 a loop-shaped anchor; 10 an annular cavity; 11 an anchoring area; 12 grouting a cavity; 13 blocking the fan blades; 14 stirring the microcolumn; 15 sealing the sleeve I; 16 a sealing lip; 17 a through hole II; 18 sealing the sleeve II; 19 grooves; 20 air exhaust holes; 21 dry pulp capsules; 22 ring-type polyester film; reserving anchor cable holes 23; 25 geogrid mesh; 26 closed countersunk rivets; 27 a rubber gasket; 29 limiting bulges; 30 a deformation absorbing layer; 31, positioning holes; 32 a guide slide block; 33 reserving a grouting hose hole; 34 prefabricating a double-wall block single front wall; 35 prefabricating a single rear wall of the double-wall building block; 36 rubber ribs; 37 an extension plate; 38 injection vacuum anchor cable; 39 and a disk.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

The double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system comprises a prefabricated double-wall retaining wall, injection type vacuum anchor cables 38, a deformation absorption layer 30 and a geogrid net 25. The prefabricated double-wall retaining wall is arranged along the direction parallel to the side slope and is formed by connecting a plurality of prefabricated double-wall building block monomers which are sequentially arranged along the horizontal direction and the vertical direction. As shown in fig. 2 to 6, the single prefabricated double-wall block comprises a front wall 34 and a rear wall 35, the front wall 34 and the rear wall 35 are prefabricated by concrete and steel bars, the front wall 34 and the rear wall 35 are arranged in parallel, the front wall 34 and the rear wall 35 are fixedly connected, a rubber rib plate 36 is arranged in a gap between the front wall 34 and the rear wall 35, two rubber rib plates 36 are arranged at intervals in each single prefabricated double-wall block, and the rubber rib plates 36 are assembled by rubber blocks with certain thickness at the position of a preset steel skeleton, so that the double-wall block has the advantages of shock absorption, wear resistance, skid resistance, flexibility and the like. The thickness of the single front wall 34 of the prefabricated double-wall block is larger than that of the single rear wall 35 of the prefabricated double-wall block, so that the rigidity of the single front wall 34 of the prefabricated double-wall block is larger than that of the single rear wall 35 of the prefabricated double-wall block, the single front wall 34 of the prefabricated double-wall block mainly plays a role of rigid slope protection, and the single rear wall 35 of the prefabricated double-wall block and other components play a role of flexible slope protection. The gaps formed by the front wall 34 of the prefabricated double-wall block monomer, the rear wall 35 of the prefabricated double-wall block monomer and the rubber rib plates 36 and the gaps formed by two adjacent prefabricated double-wall block monomers are filled with gravels with large particle size to form a deformation absorbing layer 30, so that the deformation absorbing layer has strong anti-overturning capability, can bear larger soil pressure and improves the overall stability of the prefabricated double-wall retaining wall.

The bottom of the single rear wall 35 of the prefabricated double-wall building block is fixedly connected with an extension plate 37, the extension plate 37 is located behind the single rear wall 35 of the prefabricated double-wall building block, a geogrid net 25 is fixed on the rear side of the extension plate 37, the wood grid net 25 is composed of multiple layers of glass fiber geogrids, and the geogrid net is fixed in a soil layer through a closed countersunk rivet 26. The geogrid mesh 25 is laid and fixed by the extension plates 37.

The top surface of the single front wall 34 of the prefabricated double-wall building block is provided with a plurality of positioning holes 31, a plurality of limiting bulges 29 are correspondingly fixed on the bottom surface of the single front wall 34 of the prefabricated double-wall building block, and when the single prefabricated double-wall building block is assembled from top to bottom, the positioning holes on the top surface of the single top surface of the lower layer of the prefabricated double-wall building block are just inserted into the limiting bulges 29 on the bottom surface of the single bottom surface of the upper layer of the prefabricated double-wall building block, so that the positioning connection between the single upper layer of the prefabricated double-wall building block and the single lower layer of the prefabricated double-wall building block is realized. A plurality of horizontal PVC grouting hose holes 33 and vertical PVC grouting hose holes 33 are respectively arranged in the front wall 34 and the rear wall 35 of the single prefabricated double-wall building block, and when PVC hoses sequentially pass through the plurality of horizontal PVC grouting hose holes 33, the fixed connection between the single prefabricated double-wall building blocks in the horizontal direction is realized; when the PVC hoses sequentially pass through the plurality of PVC grouting hose holes adjacent to each other in the vertical direction, the fixed connection between the prefabricated double-wall building block monomers in the vertical direction is realized.

The side surfaces and the top surfaces of the single front walls 34 of the prefabricated double-wall building blocks are provided with a plurality of elastic rubber gaskets 27, and certain construction errors are considered, and if certain gaps exist during assembly of the adjacent box-type building blocks, the adjacent box-type building blocks can be filled with the rubber gaskets. One side of the rear side wall of the single front wall 34 of the prefabricated double-wall building block is fixed with a guide sliding block 32, and by arranging the guide sliding block, when the prefabricated box type building block is assembled from left to right, accurate assembly between two adjacent prefabricated double-wall building blocks can be ensured through the guide sliding block.

The rear wall 35 of the single prefabricated double-wall building block is provided with a reserved anchor cable hole 23, and the front part of the injection type vacuum anchor cable 38 penetrates through the reserved anchor cable hole 23. As shown in fig. 13 to 19, the injection type vacuum anchor cable 38 includes an anchor cable body 1, an anchor nut 4, a metal piston disc 3, a sealing washer 7, a substrate 8, an annular anchoring body 9 and a guide tube 12, wherein one end of the annular anchoring body 9 is fixedly connected to the substrate 8, the other end is connected to the guide tube 12, through holes are formed in the centers of the annular anchoring body 9 and the substrate 8, the anchor cable body 1 sequentially penetrates through the guide tube 12, the annular anchoring body 9 and the substrate 8, an annular cavity 10 is formed in the annular anchoring body 9, and the diameter of the annular cavity 10 is larger than that of the anchor cable body 1. In the application, the annular anchoring body 9 and the substrate 8 form an anchoring area 11, and in the anchoring area 11, the anchoring between the anchor cable body 1 and the substrate 8 and between the anchor cable body 9 and the annular anchoring body is realized. A grouting cavity 12 is formed between the anchor cable body 1 and the stable rock mass.

And drilling holes in the stabilized rock mass by using an anchor cable drilling machine at the reserved anchor cable holes 23 of the rear wall 35 of the single prefabricated double-wall building block, wherein the hole depth is equal to the embedded length of the anchor cable, namely the length is not less than the length of the injection type vacuum anchor cable 38, and the injection type vacuum anchor cable 38 is positioned in the drilled holes. The annular anchoring body 9 of the injection type vacuum anchor cable 38 is fixed in the reserved anchor cable hole 23, in this embodiment, the annular outer wall of the annular anchoring body 9 and the inner wall of the reserved anchor cable hole 23 are in interference fit, so that the annular anchoring body 9 and the reserved anchor cable hole 23 are fixedly connected. Because the size of the annular anchoring body 9 is larger than the diameter of the reserved anchor cable hole 23, the front end of the injection type vacuum anchor cable 38 is fastened on the outer side of the reserved anchor cable hole 23, and therefore connection between the injection type vacuum anchor cable 38 and the rear wall 35 of the single prefabricated double-wall building block is achieved.

The outside of base plate 8 is equipped with metal piston dish 3, and the center of metal piston dish 3 is equipped with through-hole I5, and anchor rope body 1 passes from through-hole I5. A sealing sleeve I15 is fixed on the annular outer side of the metal piston disc 3, a sealing sleeve II 18 is arranged on the outer side of the sealing sleeve I15, and one end of the sealing sleeve II 18 is fixedly connected with the base plate 8. The sealing sleeve I15 is arranged in the sealing sleeve II 18 in a sliding mode, and when the sealing sleeve I15 slides in the sealing sleeve II 18, the metal piston plate 3 also slides up and down. One side of the metal piston disc 3 departing from the base plate 8 is provided with an anchoring nut 4, and the metal piston disc 3 is fixedly connected with the anchoring nut 4. The outer surface of the anchor cable body 1 is provided with external threads, and the internal threads of the anchoring nut 4 are in threaded connection with the external threads of the anchor cable body 1. When the anchor nut 4 is screwed toward the base plate 8, the metal piston disc 3 moves toward the base plate 8 while rotating with the anchor nut 4.

A sealing gasket 7 is arranged between the metal piston disc 3 and the base plate 8, a through hole II 17 through which the anchor cable body 1 penetrates is formed in the center of the sealing gasket 7, the annular outer side face of the sealing gasket 7 is in interference fit sealing connection with the inner side face of the sealing sleeve I15, a sealing lip 16 is arranged at one end, facing the base plate 8, of the sealing gasket 7, the sealing lip 16 is located on the outer side of the sealing sleeve I15, and the sealing lip 16 is used for achieving sealing between the sealing gasket 7 and the base plate 8. Through sealing sleeve I15 and seal ring 7, the sealed effect to the thick liquid has been played.

In an initial state, a capsule storage cavity 6 is arranged between the metal piston disc 3 and the sealing washer 7, a dry pulp capsule 21 is arranged in the capsule storage cavity 6, the dry pulp capsule 21 comprises an outer layer of synthetic resin film and contents positioned in the synthetic resin film, the synthetic resin film is made of polyester fibers or epoxy resin, the contents are curable pulp, and the contents comprise: 40% -75% of calcium aluminium sulphate based hydraulic cement; 35% -60% of mineral filler, in the embodiment, the mineral filler is sand; 0.02-5% of thixotropic agent, in the embodiment, the thixotropic agent adopts cellulose-based colloid agent; 0.02% to 5% of a superplasticiser based on melamine sulphonate; 0.02-5% of air entraining agent, in the embodiment, the air entraining agent adopts fatty acid and resin acid and salt thereof.

The metal piston disc 3 comprises an upper disc 39 and blocking blades 13, a plurality of crescent-shaped blocking blades 13 are arranged between the upper disc 39 and the capsule storage cavity 6, the blocking blades 13 are uniformly arranged at intervals along the circumferential direction of the upper disc 39, one end of each blocking blade 13 is fixedly connected with the inner side surface of the sealing sleeve I15, and the other end of each blocking blade 13 is fixedly connected with the lower surface of the upper disc 39. Seal ring 7 is equipped with several stirring microcolumn 14 along its circumference towards the terminal surface of metal piston dish 3, and in this embodiment, the circumference along seal ring 7 is equipped with inside and outside two-layer, and every layer includes the stirring microcolumn 14 that the even interval of several set up, and what correspond is equipped with several layers of annular recess 19 in last dish 39 one side towards seal ring 7, the one end and the seal ring 7 fixed connection of stirring microcolumn 14, the other end inserts in the recess 19. In this embodiment, the free end of the stirring microcolumn 14 is arc-shaped, and the cross-sectional shape of the corresponding groove is arc-shaped, which is beneficial to realizing the contact between the stirring microcolumn 14 and the groove 19. The inner surface of the recess 19 is provided with an annular polyester film 22. The upper plate 39 is further provided with a plurality of exhaust holes 20 at intervals, and air in the anchoring area 11 can be exhausted through the exhaust holes 20, so that a vacuum environment of the anchoring area 11 is realized.

When the metal piston disc 3 moves towards the base plate 8 along with the anchoring nut 4, the clearance between the stirring micro-column 14 and the groove 19 is gradually reduced, and when the stirring micro-column 14 passes through the dry pulp capsule 21, the stirring micro-column 14 punctures the synthetic resin film of the dry pulp capsule, so that the curable slurry in the synthetic resin film flows out. Meanwhile, the metal piston disc 3 also rotates along with the anchoring nut 4, and the metal piston disc 3 rotates and simultaneously drives the sealing sleeve I15 and the sealing washer 7 to rotate, so that the plugging fan blades 13 and the stirring micro-column 14 also rotate along with the metal piston disc. By stirring the rotation of the microcolumns 14 and the blocking fan blades 13, the curable slurry can be prevented from flowing backward, and can be sufficiently stirred, so that the curable slurry is sufficiently mixed with the thixotropic agent in the annular polyester film 22, and the thixotropic agent enables the curable slurry to have thixotropy, thereby ensuring that the curable slurry cannot sink or flow out of the drilled holes.

The curable grout with thixotropy expands, flows into the annular cavity 10 and the grouting cavity 12 of the annular anchoring body 9 under the guiding action of the sealing washer 7, exhausts air in the annular cavity 10 and the grouting cavity 12 through the exhaust valve 20, a miniature exhaust pump can be arranged at the exhaust hole 20, and the air in the drilled holes is continuously exhausted through the exhaust pump, so that a vacuum environment is formed in the annular cavity 10 and the grouting cavity 12, and the curable grout is continuously sucked into the annular cavity 10 and the grouting cavity 12 under the negative pressure generated by the vacuum environment. In the annular cavity 10, after the slurry is solidified, the anchor cable body 1 is fixedly connected with the substrate 8 and the annular anchoring body 9, so that the substrate 8 and the annular anchoring body 9 are anchored at the end part of the anchor cable body 1, the anchor cable body is anchored in an anchoring area formed by the substrate and the annular anchoring body, and the annular anchoring body is tightly buckled at the front side of the reserved anchor cable hole, so that the connection between the injection type vacuum anchor cable and the rear wall of the prefabricated double-wall building block monomer is realized; in addition, the curable slurry expands the sealing gasket 7 outwardly, causing the sealing gasket 7 to mate with the sealing sleeve I15 and the substrate 8, which acts as a seal against the slurry. In the grouting cavity 12, after the grout is solidified, the rear end of the anchor cable body 1 is fixed in the borehole of the stable rock body through the grout, thereby realizing the self-anchoring of the injection type vacuum anchor cable 38.

The construction method of the double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system comprises the following construction steps.

Firstly, preparing components such as prefabricated double-wall building block monomers, injection type vacuum anchor cables and the like. The method specifically comprises the following steps.

The method is characterized in that geological investigation is carried out on the side slope, specific sizes and quantities of components such as a prefabricated double-wall building block monomer, a PVC grouting hose, an injection type vacuum anchor cable and the like are designed according to engineering requirements, and prefabricated production is carried out in a factory.

And (4) carrying the prefabricated double-wall building block monomer, the PVC grouting hose, the injection type vacuum anchor cable and other components to a construction site, cleaning sundry stones on the side slope, leveling and tamping.

And secondly, assembling a single-layer transverse framework of the prefabricated double-wall retaining wall.

After the slope is leveled, a C30 concrete surface layer with the thickness of about 6mm is sprayed to the slope surface. Then, the prefabricated double-wall building block single bodies are assembled from left to right, accurate positioning between two adjacent prefabricated double-wall building block single bodies can be achieved through the guide sliding blocks 32, after a whole row of prefabricated double-wall building block single bodies are constructed, PVC grouting hoses penetrate through the reserved grouting hose holes 33, the prefabricated double-wall building block single bodies in the horizontal direction are fixed, and the adjacent prefabricated double-wall building block single bodies form a transverse framework.

After the connection and fixation of the horizontal prefabricated double-wall building block monomer are completed, grouting construction is carried out through a PVC grouting hose, proper grouting pressure is selected, and the uniformity and compactness of grout in the hole gap are ensured as far as possible.

Then, in the stable rock body at the position of the reserved anchor cable hole 22 of the rear wall 35 of the single prefabricated double-wall building block, an anchor cable drilling machine is used for drilling, and the hole depth is equal to the embedded length of the anchor cable, namely the length of the injection type vacuum anchor cable 38 is not less than the length of the anchor cable.

And thirdly, installing an injection type vacuum anchor cable 38, wherein the front end of the injection type vacuum anchor cable is connected with the prefabricated double-wall retaining wall, and the rear end of the injection type vacuum anchor cable is anchored in the stable rock mass. .

And (I) installing an injection type vacuum anchor cable.

The annular anchoring body 9, the base plate 8, the sealing washer 7, the capsule storage cavity 6 filled with the dry pulp capsule, the metal piston disc 3 and the anchoring nut 4 sequentially penetrate through the end part of the anchor cable body 1, pretightening force is applied to the anchoring nut 4 through the loading device for locking, under the rotating and locking action of the anchoring nut 4, the metal piston disc 3 rotates along with the anchoring nut 4 and moves towards the base plate 8, and at the moment, the anchoring nut 4 applies extrusion force towards the base plate 8 to the metal piston disc 3.

And (II) connecting the front end of the injection type vacuum anchor cable with the prefabricated double-wall retaining wall, and anchoring the rear end of the injection type vacuum anchor cable in the stable rock mass.

At a pressure threshold, the metal piston disc 3 is pressed against the sealing washer 7. The volume of the capsule storage chamber 6 between the metal piston disc 3 and the sealing gasket 7 becomes smaller and smaller, and the dry slurry capsule 21 in the capsule storage chamber 6 is squeezed. After the agitation microcolumn 14 passes through the dry slurry capsule 21 and is inserted into the groove 19, the dry slurry capsule 21 is pierced and the curable slurry in the dry slurry capsule 21 flows out. After the mixing micro-column 14 is contacted with the groove 19, the metal piston disc 3 can not move continuously towards the direction of the base plate 8, and at the moment, the position of the metal piston disc 3 is fixed through the threaded connection between the anchoring nut 4 and the anchor cable body.

In the process that the metal piston disc 3 rotates along with the anchoring nut 4, the stirring microcolumns 14 and the plugging fan blades 13 also rotate along with the metal piston disc, curable grout is fully stirred under the rotating action of the stirring microcolumns 14 and the plugging fan blades 13 and fully contacts with the annular polyester film 22 on the inner surface of the groove 19, after the curable grout fully contacts with a thixotropic agent in the annular polyester film 22 and reacts, the curable grout has thixotropy, and the curable grout with thixotropy continuously flows into the annular cavity 10 and the grouting cavity 12 in the annular anchoring body 9 under the flow guiding action of the sealing washer 7;

in the process that the metal piston disc 3 moves towards the direction of the sealing washer 7 and the curable slurry flows into the annular cavity 10 and the grouting cavity 12, air in the annular cavity 10 and the drilled holes is exhausted through the exhaust holes 20, so that a vacuum environment is formed in the annular cavity 10 and the grouting cavity 12, and the curable slurry is continuously sucked into the annular cavity 10 and the grouting cavity 12 by negative pressure formed by the vacuum environment;

in the annular cavity 10, after the grout is cured, an anchoring force is formed among the anchor cable rope body 1, the substrate 8 and the annular anchoring body 9, and simultaneously the curable grout expands to enable the sealing gasket 7 to expand outwards, so that the sealing gasket 7 is tightly matched with the sealing sleeve I15 and the substrate 8, the anchor cable rope body 1 is anchored in an anchoring area 11 formed by the substrate 8 and the annular anchoring body 9, and the annular anchoring body 9 is tightly buckled on the front side of the reserved anchor cable hole 23, so that the connection between the injection type vacuum anchor cable 38 and the rear wall 35 of the prefabricated double-wall building block monomer is realized; in the grouting cavity 12, after the grout is solidified, an anchoring force is formed between the anchor cable body 1 and the stable rock mass around the drilled hole.

A miniature exhaust pump can be arranged at the exhaust valve 20 on the metal piston disc 3, the exhaust of gas in the annular cavity 10 and the drill hole can be accelerated through the miniature exhaust pump, a vacuum environment is conveniently formed in the annular cavity and the drill hole, and the exhaust hole 20 is blocked after the anchoring is finished.

After the injection type vacuum anchor cable 38 and the prefabricated double-wall building block are installed, one end of the geogrid net 25 is laid on the extension plate 37 of the single rear wall 35 of the prefabricated double-wall building block, the other end of the geogrid net 25 is laid on the soil layer, and the geogrid net 25 is fixed in the soil layer through the closed countersunk rivets 26.

And fourthly, installing each layer of prefabricated double-wall building blocks and injection type vacuum anchor cables according to the sequence from top to bottom until the whole slope protection system is constructed.

And (I) assembling the single-layer transverse frameworks of the prefabricated double-wall retaining wall according to the sequence from top to bottom.

And after the grouting construction in the second step is finished for 24 hours, continuously positioning the positions of the next layer of prefabricated double-wall building blocks according to the design requirements and adding marks at the positions. And repeating the steps from the second step to the third step to finish the assembly of the layer of the prefabricated double-wall building blocks and the injection type vacuum anchor cable.

And (II) forming a vertical framework between two vertically adjacent layers of the prefabricated double-wall building blocks, and grouting in the reserved grouting hose holes in the vertical direction.

The prefabricated double-wall building block single body is assembled from top to bottom, the upper layer of prefabricated double-wall building block single body is connected with the lower layer of prefabricated double-wall building block single body in a positioning mode through the limiting protrusions 29 at the bottom of the upper layer of prefabricated double-wall building block single body and the corresponding positioning holes 31 at the top of the lower layer of prefabricated double-wall building block single body, after the upper layer and the lower layer of construction are completed, the PVC grouting hoses sequentially penetrate through the vertical reserved grouting hose holes of the vertically adjacent prefabricated double-wall building block single bodies, the prefabricated double-wall building block single bodies in the vertical direction are fixed, and the adjacent prefabricated double-wall building block single bodies form a vertical framework.

After the connection and fixation of the vertical prefabricated double-wall building block monomer are completed, grouting construction is carried out through a PVC grouting hose, proper grouting pressure is selected, and the uniformity and compactness of grout in the hole gap are ensured as far as possible.

And (III) repeating the step (I) to the step (II), and assembling the horizontal framework of the single-layer prefabricated double-wall retaining wall and the vertical framework formed by two vertical adjacent prefabricated double-wall building blocks according to the sequence from top to bottom.

According to the sequence from top to bottom, the assembly of the horizontal framework and the vertical framework is completed in sequence until the assembly of the prefabricated double-wall retaining wall is completed along the whole protection slope, and finally the retaining wall formed by the prefabricated double-wall building block monomers is shown in figure 12.

After the prefabricated double-wall building block is assembled, the large-particle-size crushed stone is filled in the groove of the building block to form a deformation absorption layer 30, and the construction of a slope protection system is completed.

When the prefabricated double-wall building block is subjected to grouting construction, the grouting hose is timely pulled out of the hole according to the specific size of the building block, the grouting pressure and the position of the grouting hose, so that the prefabricated double-wall building block can be uniformly condensed to an expected degree, and the requirements of uniformity and compactness of grout in a hole gap are met; the grouting slurry is concrete slurry.

The double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system and the construction method thereof provided by the invention are described in detail above. The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system is characterized by comprising a prefabricated double-wall retaining wall, injection type vacuum anchor cables (38), a deformation absorption layer (30) and a geogrid net (25), wherein the prefabricated double-wall retaining wall is arranged along a direction parallel to a side slope and is formed by connecting a plurality of prefabricated double-wall building block monomers which are sequentially arranged along the horizontal direction and the vertical direction; the prefabricated double-wall retaining device is internally filled with a deformation absorption layer (30), and an injection type vacuum anchor cable (38) is connected with the prefabricated double-wall retaining wall;

the prefabricated double-wall building block single body comprises a prefabricated double-wall building block single body front wall (34) and a prefabricated double-wall building block single body rear wall (35), a reserved anchor cable hole (23) is formed in the prefabricated double-wall building block single body rear wall (35), and the front portion of an injection type vacuum anchor cable (38) penetrates through the reserved anchor cable hole (23);

the injection type vacuum anchor cable (38) comprises an anchor cable body (1), an anchoring nut (4), a metal piston disc (3), a sealing washer (7), a substrate (8), an annular anchoring body (9) and a guide pipe (12), wherein one end of the annular anchoring body (9) is fixedly connected with the substrate (8), the other end of the annular anchoring body is connected with the guide pipe (12), through holes are formed in the centers of the annular anchoring body (9) and the substrate (8), the anchor cable body (1) sequentially penetrates through the guide pipe (12), the annular anchoring body (9) and the substrate (8), an annular cavity (10) is arranged in the annular anchoring body (9), the diameter of the annular cavity (10) is larger than that of the anchor cable body (1), the annular anchoring body (9) and the substrate (8) form an anchoring area (11), and the size of the annular anchoring body (9) is larger than that of a reserved anchor cable hole (23);

the anchor cable fixing device is characterized in that a metal piston disc (3) is arranged on the outer side of the base plate (8), a through hole I (5) for an anchor cable body to penetrate through is formed in the center of the metal piston disc (3), a sealing sleeve I (15) is fixed on the annular outer side of the metal piston disc (3), an anchoring nut (4) is arranged on one side, away from the base plate (8), of the metal piston disc (3), the metal piston disc (3) is fixedly connected with the anchoring nut (4), external threads are formed on the outer surface of the anchor cable body (1), and threaded connection is formed between internal threads of the anchoring nut (4) and the external threads of the anchor cable body (1);

a sealing washer (7) is arranged between the metal piston disc (3) and the base plate (8), a through hole II (17) through which the anchor cable body (1) penetrates is formed in the center of the sealing washer (7), the annular outer side face of the sealing washer (7) is in interference fit sealing connection with the inner side face of the sealing sleeve I (15), a sealing lip (16) is arranged at one end, facing the base plate (8), of the sealing washer (7), the sealing lip (16) is located on the outer side of the sealing sleeve I (15), and the sealing lip (16) is used for achieving sealing between the sealing washer (7) and the base plate (8);

a capsule storage cavity (6) is arranged between the metal piston disc (3) and the sealing washer (7), a dry pulp capsule (21) is arranged in the capsule storage cavity (6), and the dry pulp capsule (21) comprises an outer synthetic resin film and contents positioned in the synthetic resin film;

the metal piston disc (3) comprises an upper disc (39) and plugging fan blades (13), a plurality of crescent plugging fan blades (13) are arranged between the upper disc (39) and a capsule storage cavity (6), the plugging fan blades (13) are uniformly arranged at intervals along the circumferential direction of the upper disc (39), one ends of the plugging fan blades (13) are fixedly connected with the inner side surface of a sealing sleeve I (15), the other ends of the plugging fan blades (13) are fixedly connected with the lower surface of the upper disc (39), a plurality of stirring micro-columns (14) are arranged on the end surface, facing the metal piston disc (3), of the sealing washer (7) along the circumferential direction of the sealing washer, a plurality of layers of annular grooves (19) are correspondingly arranged on one side, facing the sealing washer (7), of the upper disc (39), one ends of the stirring micro-columns (14) are fixedly connected with the sealing washer (7), the other ends of the stirring micro-columns are inserted into the grooves (19), annular polyester films (22) containing thixotropic agents are arranged on the inner surface of the grooves (19), the upper disc (39) is provided with a plurality of exhaust holes (20) at intervals.

2. The double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system according to claim 1, wherein a sealing sleeve II (18) is arranged outside the sealing sleeve I (15), one end of the sealing sleeve II (18) is fixedly connected with the base plate (8), and the sealing sleeve I (15) is slidably arranged in the sealing sleeve II (18).

3. The double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system according to claim 1, wherein an inner layer and an outer layer of stirring micro-columns (14) are arranged along the circumference of the sealing washer (7), each layer comprises a plurality of stirring micro-columns (14) which are uniformly arranged at intervals, the free ends of the stirring micro-columns (14) are arc-shaped, and the cross-sectional shapes of the corresponding grooves (19) are arc-shaped.

4. The double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system according to claim 1, wherein the prefabricated double-wall block single body comprises a prefabricated double-wall block single body front wall (34) and a prefabricated double-wall block single body rear wall (35), the prefabricated double-wall block single body front wall (34) and the prefabricated double-wall block single body rear wall (35) are arranged in parallel, the prefabricated double-wall block single body front wall (34) and the prefabricated double-wall block single body rear wall (35) are fixedly connected, a rubber rib plate (36) is arranged in a gap between the prefabricated double-wall block single body front wall (34) and the prefabricated double-wall block single body rear wall (35), the thickness of the prefabricated double-wall block single body front wall (34) is larger than that of the prefabricated double-wall block single body rear wall (35), and a gap formed by the prefabricated double-wall block single body front wall (34), the prefabricated double-wall block single body rear wall (35) and the rubber rib plate (36), And large-particle-size crushed stones are filled in a gap formed by two adjacent prefabricated double-wall building block monomers to form a deformation absorption layer (30);

the bottom of the single rear wall (35) of the prefabricated double-wall building block is fixedly connected with an extension plate (37), the extension plate (37) is located behind the single rear wall (35) of the prefabricated double-wall building block, a geogrid net (25) is fixed to the rear side of the extension plate (37), and the geogrid net is fixed in a soil layer through a closed countersunk rivet (26).

5. The double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system according to claim 1, wherein the top surface of the single front wall (34) of the prefabricated double-wall building block is provided with a plurality of positioning holes (31), a plurality of limiting protrusions (29) are correspondingly fixed on the bottom surface of the single front wall (34) of the prefabricated double-wall building block, and when the single prefabricated double-wall building block is assembled from top to bottom, the positioning holes on the top surface of the single prefabricated double-wall building block of the lower layer are just inserted into the limiting protrusions (29) on the bottom surface of the single prefabricated double-wall building block of the upper layer.

6. The double-wall retaining wall-injection type vacuum anchor cable cooperative slope protection system according to claim 1, wherein a plurality of horizontal PVC grouting hose holes and vertical PVC grouting hose holes are formed in each of the single front wall (34) and the single rear wall (35) of the prefabricated double-wall block;

the side surfaces and the top surfaces of the single front walls (34) of the prefabricated double-wall building blocks are provided with a plurality of elastic rubber gaskets (27), and one side of the rear side wall of the single front wall (34) of the prefabricated double-wall building block is fixed with a guide sliding block (32).

7. The double-wall retaining wall-injection vacuum anchor cable cooperative slope protection system according to claim 1, wherein the synthetic resin film is made of polyester fiber or epoxy resin, the content is curable slurry, and the content comprises: 40% -75% of calcium aluminium sulphate based hydraulic cement; 35% -60% of mineral filler, wherein the mineral filler is sand; 0.02-5% of a thixotropic agent, wherein the thixotropic agent is a cellulose-based colloid agent; 0.02% to 5% of a superplasticiser based on melamine sulphonate; 0.02-5% of air entraining agent, wherein the air entraining agent adopts fatty acid, resin acid and salt thereof.