An expanded sawtooth bite type self-grouting anchor cable

Abstract

The invention discloses an expanded body sawtooth bite type self-grouting anchor cable, comprising an anchor cable body arranged in the soil body of the supporting slope, the anchor cable body is provided with anchor cable stirrups and an axial grouting rod, the anchoring section is provided with an expanded body anchor head component, the anchor head component comprises an expanded body plate, a connecting block and a grouting spur, the axial grouting rod passes through the connecting block and is fixedly connected with the connecting block, the two ends of the connecting block are respectively rotatably connected to the expanded body plate, and the outer side surface of the expanded body plate is provided with a grouting spur; the expanded body plate and the connecting block are both provided with a grouting flow channel inside, and the grouting flow channel is connected with the inside of the axial grouting rod. The invention drills into the soil body through the grouting spur to strengthen the combination of the soil body and the anchor body, grouts the soil body through the spur, forms a complete anchor body and bite anchoring force, strengthens the surrounding soil body strength, and forms the combination of the expanded body plate, the spur, the grouting body and the soil body, strengthens the soil body strength and the anchoring strength around the anchor body, and also forms a series of concave and convex bite structures, further improving the anchoring capacity.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering slope support, and in particular relates to an expanded sawtooth bite type self-grouting anchor cable. Background Art

[0002] In infrastructure construction, slope engineering, foundation pit engineering, especially deep foundation pit engineering, often encounters the problem of landslide and instability. Slope support is the main measure to prevent landslide and instability. Therefore, the problem of slope support is becoming more and more important. How to improve the anchoring force of anchor rods and anchor cables in slope support is the key to effectively solve the problem of slope support. Flexible support structure can provide reliable anchoring force while meeting the development goals of energy saving and high efficiency.

[0003] The existing anchor rods and anchor cables are reinforced by grouting at the anchoring end, which mainly utilizes the bonding and friction between the anchor body and the soil. With the increase of slope height, serious soil disturbance, and the increase of engineering importance, the demand for anchoring force is also increasing. The anchoring effect of the friction between the grouting body, that is, the anchor body and the soil, can no longer meet the engineering needs. The commonly used means at present are to continuously lengthen the anchoring section, increase the grouting amount, and increase the density of anchor rods / cables. However, this method not only increases the engineering materials and labor consumption, but also has a greater impact on the environment; deepening the drilling depth, increasing the density of anchor rods and grouting will undoubtedly disturb the deep stable soil layer. At the same time, in the traditional drilling anchoring process, the original soil loses its strength due to the disturbance of the drilling to the original soil. Due to the large depth and insufficient grouting pressure, the grouting only bonds with the loose surface soil of the deep soil, which greatly weakens the anchoring efficiency of the anchoring section, fails to form a good integrity with the soil, and greatly reduces the anchoring effectiveness and pull-out resistance. Summary of the invention

[0004] In view of the deficiencies pointed out in the above background technology, the present invention provides an expanded serrated bite-type self-grouting anchor cable, aiming to solve the problems existing in the prior art in the above background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] An expanded sawtooth bite type self-grouting anchor cable, comprising an anchor cable body fixed in the slope soil by means of anchors and baffles at the supporting slope, the anchor cable body being provided with anchor cable stirrups and an axial grouting rod, the anchoring section of the anchor cable body forming an anchor body by grouting, the anchor body comprising a plurality of anchor head components, the anchor head components comprising an expanded plate, a connecting block and a grouting spur, the two ends of the connecting block being rotatably connected with expanded plates respectively, the expanded plates at the two ends being rotatably connected with limiting members respectively, the limiting members being rotatably connected to the anchor cable stirrups, the outer surface of the expanded plate being provided with grouting spurs; the axial grouting rod passing through a fixing hole in the middle of the connecting block, and the axial grouting rod being fixedly connected to the connecting block at the fixing hole, the expanded plate and the connecting block being provided with grouting channels inside, the grouting channels being connected with the inside of the axial grouting rod at the fixing hole.

[0007] Preferably, the limit member adopts a hinged support rod, one end of which is hinged to the anchor stirrup, and the other end of the hinged support rod is connected to a rotating shaft, which is arranged in an expansion plate shaft hole on the expansion plate, and the expansion plate can rotate around the rotating shaft.

[0008] Preferably, one side of the end of the connection block is connected to one side of the end of the expanded body plate by a hinge, and an elastic soil retaining plate is provided between the other side of the end of the connection block opposite to the hinge and the other side of the end of the expanded body plate. The elastic soil retaining plate can prevent the connection end of the connection block and the expanded body plate from being filled with soil and hindering the rotation of the expanded body plate. Specifically, the elastic soil retaining plate can be made of a deformation memory alloy. As the expanded body plate rotates, the elastic soil retaining plate can be deformed to avoid affecting the rotation of the expanded body plate.

[0009] Preferably, a plurality of anchor stirrups are arranged at intervals along the length direction of the axial grouting rod on the anchor cable body, and a plurality of support rods parallel to the axial grouting rod are fixed at intervals around the anchor stirrups. The outer tube of the anchor cable body is formed by the support rods and the anchor stirrups.

[0010] Preferably, a plurality of grouting burrs are respectively provided on the outer side surface and the front end surface of the expanded body plate, wherein the grouting burrs are hollow structures, and the connection between the grouting burrs and the expanded body plate forms a burr grouting inlet, and the tip of the grouting burr is a burr grouting outlet.

[0011] Compared with the shortcomings and deficiencies of the prior art, the present invention has the following beneficial effects:

[0012] (1) The anchoring section of the present invention is provided with a plurality of expanded anchor head components, and the grouting spikes on the expanded plate of the expanded anchor head component are drilled into the soil, which can not only strengthen the combination of the soil and the anchor body, but also the grouting body is grouted into the soil through the spikes, thereby strengthening the strength of the surrounding soil and forming a combination of the expanded plate, spikes, grouting body and soil, greatly strengthening the soil strength and anchoring strength around the anchor body. In addition, the strength of the surrounding soil is strengthened by the grouting of the spikes, while the bite of the spikes and the soil is formed, forming a preliminary anchoring, and then the pores with short anchor bites are filled by the hole grouting, forming a complete anchor body and anchoring force.

[0013] (2) The concave-convex interlocking structure formed by the expansion body of the anchor cable anchoring section of the present invention and the soil drilling hole makes the anchoring force of the anchor cable anchoring section not only rely on the bonding and friction between the anchor body and the soil, but also increases the serration interlocking between the anchor body and the soil, and the interlocking between the spurs and the soil. The adjacent expansion bodies squeeze each other and also strengthen the strength of the soil in the middle. The series of concave-convex interlocking not only improves the anchoring capacity, but also shares the force through multiple interlocking, and the anchoring strength is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the expanded sawtooth interlocking self-grouting anchor support provided by an embodiment of the present invention.

[0015] Figure 2 It is a schematic structural diagram of an expanded sawtooth interlocking self-grouting anchor cable provided in an embodiment of the present invention.

[0016] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0017] Figure 4 1 is a schematic diagram of the structure of the anchor head component provided by an embodiment of the present invention, wherein (a) is a schematic diagram of the structure of the anchor head component before expansion, and (b) is a schematic diagram of the structure of the anchor head component after expansion.

[0018] Figure 5 It is a schematic diagram of the structure of the expansion plate provided in an embodiment of the present invention.

[0019] Figure 6 It is a structural schematic diagram of the connection between the expansion plate and the connecting block provided in an embodiment of the present invention, wherein (a) is a connection schematic diagram before the expansion plate is expanded, and (b) is a connection schematic diagram after the expansion plate is expanded.

[0020] Figure 7 It is a schematic diagram of the structure of drilling a hole in soil provided by an embodiment of the present invention.

[0021] Figure 8 It is a schematic diagram of the grouting process of the expanded sawtooth interlocking self-grouting anchor provided by an embodiment of the present invention.

[0022] Fig. 9 It is a structural schematic diagram of the force between the anchor body and the soil provided by an embodiment of the present invention.

[0023] In the figure: 1. anchor cable; 2. gasket; 3. anchor; 4. baffle; 5. free section; 6. anchoring section; 7. anchor body; 8-anchor cable stirrups; 9-support rod; 10-axial grouting rod; 11-anchor head component; 12-expanded plate; 13-connecting block; 14-hinge hinge; 15-grouting spur; 151-spur grouting inlet; 152-spur grouting outlet; 16-hinge support rod; 17-rotating shaft; 18-elastic retaining plate; 19-fixing hole; 20-grouting flow channel; 21-expanded plate axial hole; 22-grouting area. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] like Figure 1 As shown, an expanded serrated bite type self-grouting anchor cable has a baffle 4 set at the supporting slope, and the anchor cable body 1 passes through the baffle 4 and extends into the soil. The anchor cable body 1 is fixed at the baffle 4 by a gasket 2 and an anchor 3. The free section 5 of the anchor cable body 1 is located at the sliding fracture zone, and the anchoring section 6 forms an anchor body 7 by grouting.

[0026] The structure of the anchor cable body 1 is as follows Figure 2 As shown, the center of the anchor body 1 is the axial grouting rod 10, and a plurality of anchor stirrups 8 are arranged at intervals along the length direction of the axial grouting rod 10. Four support rods 9 parallel to the axial grouting rod 10 are fixed at circumferential intervals on the anchor stirrups 8, and the outer tube of the anchor body 1 is formed by the support rods 9 and the anchor stirrups 8.

[0027] The anchor head member 11 is provided at the anchor stirrup 8 of the anchor section 6. Figure 3As shown, the anchor head component 11 includes a connection block 13 and two identical expansion plates 12, a fixing hole 19 is provided in the middle of the connection block 13, the axial grouting rod 10 passes through the fixing hole 19 in the middle of the connection block 13, and the axial grouting rod 10 forms a fixed connection structure with the connection block 13 at the fixing hole 19, and the two ends of the connection block 13 are respectively rotatably connected with the expansion plate 12, and the specific connection method is: one side of the end of the connection block 13 is connected to one side of the end of the expansion plate 12 through a hinge 14, and an elastic soil retaining plate 18 is provided between the other side of the end of the connection block 13 opposite to the hinge 14 and the other side of the end of the expansion plate 12, and the elastic soil retaining plate 18 can prevent the connection end of the connection block 13 and the expansion plate 12 from being filled with soil and hindering the rotation of the expansion plate 12. The elastic soil retaining plate 18 can be made of deformation memory alloy, and as the expansion plate 12 rotates, the elastic soil retaining plate 18 can be deformed to avoid affecting the rotation of the expansion plate 12.

[0028] The ends of the two expanded plates 12 close to the connecting blocks 13 are rotatably connected to the limiting members respectively. The limiting members are hinged support rods 16. One end of the hinged support rods 16 is hinged to the anchor stirrups 8. The other end of the hinged support rods 16 is connected to a rotating shaft 17. The rotating shaft 17 is arranged in an expanded plate shaft hole 21 on the expanded plate 12. Both ends of the rotating shaft 17 extend out of the expanded plate shaft hole 21 and are rotatably connected to the ends of the hinged support rods 16. The expanded plate 12 can rotate around the rotating shaft 17. Since the axial grouting rod 10 is fixedly connected to the connecting block 13, the axial grouting rod 10 is pushed along the grouting direction, and the moving axial grouting rod 10 drives the connecting block 13 to move in the grouting direction. However, since the expanded plate 12 is connected to the anchor stirrup 8 through the limiter, the movement of the connecting block 13 will push the expanded plates 12 at both ends to rotate around the rotating shaft 17, and rotate in the directions of both sides of the connecting block 13 respectively. After the connecting block 13 moves a certain distance, the expanded plates 12 at both ends rotate to be close to the same straight line with the connecting block 13, such as Figure 4 shown.

[0029] The outer side surface and the front end surface of the expansion plate 12 are respectively provided with a plurality of grouting spikes 15, such as Figure 5 As shown, the grouting spur 15 is a hollow structure, and a spur grouting inlet 151 is formed at the connection between the grouting spur 15 and the expansion plate 12 , and the tip of the grouting spur 15 is a spur grouting outlet 152 .

[0030] The expansion plate 12 and the connection block 13 are both provided with grouting channels 20. Figure 6 As shown, the grouting channel 20 is connected to the inside of the axial grouting rod 10 at the fixing hole 19, and the grouting channel 20 in the expanded plate 12 is connected to the hollow structure of the grouting thorn 15. Push the connecting block 13, the connecting block 13 drives the expanded plate 12 to rotate, and when the end surface of the connecting block 13 is rotated to contact the end surface of the expanded plate 12, the connecting block 13 is connected to the grouting channel 20 in the expanded plate 12.

[0031] Drilling is performed according to the structure of the anchor cable body 1, and the angle of the enlarged drill bit is changed by pushing the inner ribs, and the large electric drill is continuously driven to rotate, and finally a cylindrical enlarged drill hole is formed, and multiple enlarged drill holes corresponding to the enlarged anchor head component 11 are repeatedly formed, such as Figure 7 As shown, the structure after the corresponding anchor head component 11 is expanded is drilled out in the grouting area 22 at the corresponding soil depth, the anchor cable body 1 is inserted along the drill hole, and then the axial grouting rod 10 is pushed to open the expansion plate 12 of the anchor head component 11. After the expansion plate 12 is opened, the grouting spurs 15 thereon penetrate into the soil at the edge of the grouting area 22, and the expansion anchor head component 11 formed can be prevented from being pulled out by the soil's own strength. The grouting enters the grouting flow channel 20 of the connecting block 13 and the expansion plate 12 through the axial grouting rod 10, and flows out from the spur grouting outlet 152 at the tip of the grouting spur 15, as shown in FIG. Figure 8 As shown in the figure, the force between the anchor body and the soil is as follows: Fig. 9 .

[0032] The reinforcement principle formed by the enlarged sawtooth bite type self-grouting anchor cable of the present invention is as follows:

[0033] Principle of grouting reinforcement by grouting spikes: By drilling into the soil through the grouting spikes 15, not only can the combination of the soil and the anchor body be strengthened, but the grouting body can also grout the soil through the grouting spikes 15, thereby strengthening the strength of the surrounding soil and forming a combination of the expansion plate 12, the grouting spikes 15, the grouting body and the soil, forming a composite anchoring structure consistent with the principle of combination of composite material fiber body and matrix, greatly enhancing the soil strength around the anchor body and the anchoring strength.

[0034] Principle of secondary grouting: Grouting through the grouting spikes 15 strengthens the strength of the surrounding soil while forming a bite between the grouting spikes 15 and the soil to form a preliminary anchor, and then grouting through the channel to fill the pores in the anchor bite section to form a complete anchor body and bite anchor force.

[0035] Sawtooth bite principle: The concave-convex bite structure formed by the anchor head component 11 expansion body of the anchor section and the soil drill hole makes the anchoring force of the anchor cable anchor section not only rely on the bonding and friction between the anchor body and the soil, but also increase the sawtooth bite between the anchor body and the soil, the bite of the grouting spur and the soil, and the two adjacent anchor head components 11 expansion bodies squeeze each other while also strengthening the strength of the soil in the middle. The series of concave-convex bites formed not only improve the anchoring capacity, but also share the force through multiple bites, solving the problem that the soil is destroyed due to excessive force on a single expansion anchor rod, causing the entire expansion head to drive the soil to be destroyed and pulled out together.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An expanded sawtooth bite type self-grouting anchor cable, characterized in that: The anchor body is fixed to the soil through a gasket and an anchor at the baffle, and the free section of the anchor body is located at the sliding crack zone, the anchor body is provided with anchor stirrups and an axial grouting rod, the anchoring section of the anchor body forms an anchor body through grouting, and the anchor body comprises a plurality of anchor head components, the anchor head components comprise an expansion plate, a connecting block and a grouting spur, the two ends of the connecting block are respectively rotatably connected with the expansion plates, the expansion plates at the two ends are respectively rotatably connected with limiting members, the limiting members are rotatably connected to the anchor stirrups, and the outer surface of the expansion plate is provided with a grouting spur; the axial grouting rod passes through a fixing hole in the middle of the connecting block, and the axial grouting rod is fixedly connected to the connecting block at the fixing hole, and a grouting flow channel is provided inside the expansion plate and the connecting block, and the grouting flow channel is communicated with the inside of the axial grouting rod at the fixing hole; The limiter adopts a hinged support rod, one end of which is hinged to the anchor stirrup, and the other end of which is connected to a rotating shaft, and the rotating shaft is arranged in the expanded plate shaft hole on the expanded plate; One side of the connection block end is connected to one side of the expansion plate end through a hinge, and an elastic soil retaining plate is provided between the other side of the connection block end opposite to the hinge and the other side of the expansion plate end.

2. The expanded sawtooth bite type self-grouting anchor cable according to claim 1, characterized in that: The elastic soil retaining plate is made of deformation memory alloy.

3. The expanded sawtooth bite type self-grouting anchor cable according to claim 1, characterized in that: A plurality of anchor stirrups are arranged at intervals on the anchor body along the length direction of the axial grouting rod, and a plurality of support rods parallel to the axial grouting rod are fixed at intervals in the circumferential direction of the anchor stirrups.

4. The expanded sawtooth bite type self-grouting anchor cable according to claim 1, characterized in that: A plurality of grouting burrs are respectively arranged on the outer side surface and the front end surface of the expanded body plate. The grouting burrs are hollow structures. The connection between the grouting burrs and the expanded body plate forms a burr grouting inlet, and the tip of the grouting burr is a burr grouting outlet.

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