A slope protection structure

Abstract

The present invention belongs to the technical field of slope protection equipment, and discloses a slope protection structure, including a slope. A protection frame is provided on the slope surface of the slope. A planting groove is provided on the front surface of the protection frame, and a mounting seat is fixedly connected to the front surface of the protection frame. In the present invention, in rainy weather, the downward flowing water flows along the surface of the planting soil filled on the front surface of the protection frame to the top surface of the mounting seat, and penetrates into the inner cavity inside the mounting seat through the through holes and communication grooves at the top surface of the mounting seat, so as to introduce a large amount of flowing water on the front surface of the protection frame into the mounting seat, reduce the water flow at the front surface of the protection frame on the slope, thereby reducing the scouring of the flowing water on the planting soil in the planting groove, avoiding a large amount of loss of the planting soil in the planting groove under the scouring of rainwater, while strengthening the firmness of the soil by the roots of the planted vegetation, and further reducing the scouring of the flowing water on the planted vegetation and the soil, strengthening the protection effect of the slope protection structure, and improving the actual protection effect of the slope.

Description

Technical Field

[0001] The invention belongs to the technical field of slope protection equipment, in particular to a slope protection structure. Background Art

[0002] Slopes are slopes with a certain slope on both sides of the roadbed to ensure the stability of the roadbed. Common slope protection methods include planting grass or turf, planting shrubs, plastering, grouting, spraying or anchor spraying, etc. If the form of slope protection is not selected reasonably or not implemented properly, it may cause a significant increase in costs and serious soil erosion at the construction site, damaging the local ecological environment.

[0003] The slope protection structure in the prior art usually arranges a concrete protection frame on one side of the slope during use, fills the inside of the protection frame with planting soil, and plants vegetation in the planting soil. The slope protection is completed by utilizing the growth effect of the vegetation root system. However, in actual use, with the impact of rain on the slope in rainy weather, a large amount of rainwater flows along the slope and comes into contact with the planting soil and the soil layer of the slope, so that part of the soil is still mixed and carried during the actual water flow, causing soil loss on the slope. Under long-term rain erosion, the protection effect of the slope is general, and a certain amount of soil is still lost, which further affects the growth of the planted vegetation, and the actual protection effect is not good.

[0004] In addition, in order to further ensure the slope protection effect during use, the slope protection structure in the prior art usually needs to add a protective net to protect the slope after planting vegetation on the slope. However, the current protective net is laid over a large area. When the protective net is broken after a period of use, it is usually difficult to replace it as a whole. It is usually necessary to repair the broken part by filling and installing. The actual repair operation is cumbersome, the overall structure after repair is not stable enough, and the use effect is not good. Summary of the invention

[0005] The object of the present invention is to provide a slope protection structure to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a slope protection structure, comprising a slope, a protection frame is provided on the slope surface of the slope, a planting groove is provided on the front of the protection frame, a mounting seat is fixedly connected to the front of the protection frame, a baffle is fixedly connected to the top surface of the mounting seat, a through hole is provided on the top surface of the mounting seat, a movable tube is movably connected to the inner surface of the through hole, side plates and a cleaning plate are respectively fixedly connected to the outer surfaces of the movable tubes, an inner cavity is provided inside the mounting seat, a positioning block is fixedly connected to the inside of the inner cavity, the positioning block is movably connected to the bottom surface of the movable tube, and a winding rod is provided inside the baffle.

[0007] Preferably, the cleaning plates are symmetrically distributed on the outer surface of the movable pipe, and the cleaning plates are located inside the through holes. By controlling the cleaning plates to be inside the through holes, it is ensured that the movable pipe rotates under the push of water flow on the side plates, so as to complete the rotation and extraction of the blocked soil in the through holes, realize the cleaning operation, and maintain the stability of the water flow introduced into the inner cavity.

[0008] Preferably, a limiting plate is fixedly connected to the outer surface of the movable pipe, the limiting plate is located inside the inner cavity, and the size of the limiting plate is larger than that of the cleaning plate. By restricting the size of the limiting plate, the limiting plate located inside the inner cavity effectively restricts the up and down movement of the movable pipe and ensures that the position of the movable pipe is inside the through hole.

[0009] Preferably, a socket hole is opened on the bottom surface of the movable pipe, and the inner surface of the socket hole is movably sleeved with a positioning block. The movable pipes are arranged in an array on the top surface of the mounting seat. By using the movable sleeve connection between the positioning block and the movable pipe, the rotation stability of the movable pipe is enhanced, and deflection and jamming are avoided.

[0010] Preferably, a communication groove is opened on the top surface of the mounting seat, and the communication grooves are arranged in an array on the top of the mounting seat and communicate with the through holes. By using the communication between the alternately arranged through holes and communication grooves, the effect of water flow penetrating into the inner cavity is enhanced, and the water accumulation area on the top of the planting soil at the top of the protective frame is effectively reduced.

[0011] Preferably, a top groove is opened on the top surface of the baffle, the inner surface of the top groove is movably installed with a winding rod, a side hole is opened inside the baffle, the side hole communicates with the top groove, and the inner surface of the side hole is movably sleeved with the winding rod. By using the cooperation of the top groove and the side hole, the winding rod can be stably installed inside the baffle and can rotate stably.

[0012] Preferably, a limiting ring is fixedly connected to the outer surface of the winding rod, and a protective net is wound around the outer surface of the winding rod. By using the protective net wound around the winding rod, it is stretched outwards during layout, and the layout and fixation of the protective net are completed by using the positioning holes and the external insertion rods. The protection effect is enhanced, and when a part of the protective net is damaged, the protective net is stretched outwards continuously to realize switching and filling, improving the convenience of repair.

[0013] Preferably, positioning holes are opened on the front surface of the protective frame, mounting holes are opened inside the protective frame, a sleeve rod is fixedly sleeved on the inner surface of the mounting hole, the sleeve rod penetrates through the planting groove, the sleeve rod is parallel to the mounting seat, and both the sleeve rod and the mounting seat are arranged obliquely. By fixedly sleeving the sleeve rod through the mounting hole and making the sleeve rod parallel and inclined to the mounting seat, the sleeve rod adapts to the filling of the planting soil, and the inclined mounting seat facilitates guiding the water flow downwards.

[0014] Preferably, side grooves are formed on the outer surface of the sleeve rod, and the side grooves are annularly and equally spaced on the outer surface of the sleeve rod. By using the side grooves annularly distributed on the outer surface of the sleeve rod, the contact area with the planting soil is enhanced, the soil solidification effect is further improved, and combined with the entanglement of the root systems of the planted vegetation and the sleeve rod, the reinforcement of the soil is strengthened.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. By using the inclined mounting seat and making the mounting seat located on the front of the protective frame, in rainy weather, the downward flowing water flows along the surface of the planting soil filled on the front of the protective frame to the top surface of the mounting seat, and penetrates into the inner cavity of the mounting seat through the through holes and the communication grooves at the top surface of the mounting seat, so as to introduce a large amount of flowing water on the front of the protective frame on the slope into the mounting seat, reduce the water flow at the front of the protective frame on the slope, thereby reducing the scouring of the water flow on the planting soil in the planting groove, avoiding the large loss of the planting soil in the planting groove under the scouring of rainwater, while the root systems of the planted vegetation strengthen the firmness of the soil, and by further reducing the scouring of the water flow on the planted vegetation and the soil, the protection effect of the slope protection structure is enhanced, and the actual protection effect of the slope is improved.

[0017] 2. By opening through holes on the top surface of the mounting seat and movably sleeving the movable pipe in the through holes, the penetration of the water flow is completed by using the gap between the movable pipe and the through holes, reducing the flow area of the through holes and avoiding blockage. At the same time, by using the water flow flowing in the inner cavity in rainy weather to impact the side plates on the side of the movable pipe, the side plates drive the movable pipe to deflect and rotate during the rotation process, and drive the cleaning plate in the through hole to rotate, completing the cleaning inside the through hole, further improving the clogging removal effect, effectively and stably introducing the rainwater flowing outside the slope into the inner cavity of the mounting seat, and having good use effect.

[0018] 3. By using the top grooves formed on the top surface of the baffle plate and cooperating with the side holes to movably sleeve the winding rod, and using the protective net wound on the winding rod, during actual layout, by pulling out the protective net and completing the innerward protective layout between adjacent baffle plates. When a part of the protective net is actually damaged, by pulling out the winding rod corresponding to the damaged part of the protective net locally, pulling out the remaining intact protective net, and re-arranging and fixing it, avoiding the problem that it is difficult to replace the integrally arranged protective net when it is damaged, and the actual damage repair operation is simple, the actual switching process is convenient. By locally pulling out and winding the protective net, convenient and effective crushing repair is completed, maintaining the long-term protection effect, and having good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the structural schematic diagram of the present invention;

[0020] Figure 2 is the schematic diagram of the protective frame of the present invention;

[0021] Figure 3 Schematic diagram of the installation between the mounting base and the baffle of the present invention;

[0022] Figure 4 is Figure 3 Schematic diagram of the enlarged structure at position A in

[0023] Figure 5 Cross-sectional view schematic diagram of the mounting base and the baffle of the present invention;

[0024] Figure 6 Explosion diagram between the positioning block and the movable tube of the present invention;

[0025] Figure 7 Guarantee diagram of the baffle of the present invention;

[0026] Figure 8 is Figure 7 Schematic diagram of the enlarged structure at position B in

[0027] Figure 9 Schematic diagram of the sleeve rod of the present invention.

[0028] In the figure: 1, slope; 2, protective frame; 3, mounting base; 4, baffle; 5, planting groove; 6, through hole; 7, positioning block; 8, movable tube; 9, side plate; 10, limiting plate; 11, cleaning plate; 12, sleeve hole; 13, inner cavity; 14, sleeve rod; 15, top groove; 16, winding rod; 17, side hole; 18, limiting ring; 19, side groove; 20, positioning hole; 21, mounting hole; 22, connecting groove. Detailed implementation manners

[0029] Next, with reference to the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] As Figures 1 to 9 shown, an embodiment of the present invention provides a slope protection structure, including a slope 1, a protective frame 2 is provided on the slope surface of the slope 1, a planting groove 5 is provided on the front surface of the protective frame 2, a mounting base 3 is fixedly connected to the front surface of the protective frame 2, a baffle 4 is fixedly connected to the top surface of the mounting base 3, a through hole 6 is opened on the top surface of the mounting base 3, the inner surface of the through hole 6 is movably sleeved with a movable tube 8, side plates 9 and cleaning plates 11 are respectively fixedly connected to the outer surface of the movable tube 8, an inner cavity 13 is opened inside the mounting base 3, a positioning block 7 is fixedly connected to the inside of the inner cavity 13, and the positioning block 7 is movably sleeved with the bottom surface of the movable tube 8, and a winding rod 16 is provided inside the baffle 4.

[0031] First Embodiment: When a large amount of rainwater flows on the slope surface, the rainwater flowing along the surface of the planting soil in the planting groove 5 flows downward along the gap between the mounting seat 3 and the baffle 4. A large amount of water flows through the gap between the movable pipe 8 and the through hole 6 into the inner cavity 13 of the mounting seat 3, and part of the water flows into the inner cavity 13 through the communication groove 22 on the top surface of the inclined mounting seat 3. A large amount of water flowing into the inner cavity 13 at the top of the inclined mounting seat 3 flows downward along the inner cavity 13 and forms a water flow beam during the gradual downward flow. As the rainwater flows downward in the inner cavity 13, the water flow rate on the outer side of the front of the protective frame 2 gradually decreases, and the soil is filtered on the top surfaces of the communication groove 22 and the through hole 6. When the water flow rate is large, as the water in the inner cavity 13 flows rapidly downward, it pushes the side plate 9 on the side surface of the movable pipe 8 located in the inner cavity 13, so that the side plate 9 deflects under force, driving the movable pipe 8 to rotate. As the movable pipe 8 rotates, the cleaning plate 11 on the outer side surface of the movable pipe 8 rotates, so that the cleaning plate 11 located inside the through hole 6 rotates, and the blockage in the gap between the through hole 6 and the movable pipe 8 is cleaned, enabling the water flowing on the top of the mounting seat 3 to quickly flow into the inner cavity 13 inside the mounting seat 3.

[0032] First, by using the inclined mounting seat 3 and placing the mounting seat 3 in front of the protective frame 2, in rainy weather, the downward flowing water flows along the surface of the planting soil filled in front of the protective frame 2 to the top surface of the mounting seat 3, and penetrates into the inner cavity 13 inside the mounting seat 3 through the through hole 6 and the communication groove 22 at the top surface of the mounting seat 3, thereby introducing a large amount of flowing water in front of the protective frame 2 into the mounting seat 3, reducing the water flow rate at the front of the protective frame 2 on the slope 1, thus reducing the scouring of the planting soil in the planting groove 5 by the water flow, avoiding a large amount of loss of the planting soil in the planting groove 5 under the scouring of rainwater, while strengthening the firmness of the soil by the roots of the planted vegetation, and further reducing the scouring of the planted vegetation and soil by the water flow, strengthening the protection effect of the slope protection structure, and improving the actual protection effect of the slope.

[0033] In addition, by opening the through hole 6 on the top surface of the mounting seat 3 and movably sleeving the movable pipe 8 in the through hole 6, the water flow is penetrated by using the gap between the movable pipe 8 and the through hole 6, reducing the flow area of the through hole 6 to avoid blockage. At the same time, the water flowing in the inner cavity 13 in rainy weather impacts the side plate 9 on the side surface of the movable pipe 8, so that the side plate 9 drives the movable pipe 8 to rotate during the deflection process, and drives the cleaning plate 11 in the through hole 6 to rotate, completing the cleaning inside the through hole 6, further improving the blockage cleaning effect, effectively and stably introducing the rainwater flowing outside the slope into the inner cavity 13 of the mounting seat 3, and having a good use effect.

[0034] Such as Figure 4 、 Figure 5 and Figure 6As shown, the cleaning plates 11 are symmetrically distributed on the outer surface of the movable pipe 8. The cleaning plates 11 are located inside the through holes 6. A limiting plate 10 is fixedly connected to the outer surface of the movable pipe 8. The limiting plate 10 is located inside the inner cavity 13. The size of the limiting plate 10 is larger than that of the cleaning plate 11. A socket hole 12 is opened on the bottom surface of the movable pipe 8. The inner surface of the socket hole 12 is movably sleeved with the positioning block 7. The movable pipes 8 are arrayed on the top surface of the mounting seat 3. A communication groove 22 is opened on the top surface of the mounting seat 3. The communication grooves 22 are arrayed on the top of the mounting seat 3 and communicate with the through holes 6.

[0035] During the use process, by controlling the cleaning plates 11 to be located inside the through holes 6, it is ensured that the movable pipe 8 rotates under the push of water flow on the side plate 9, so as to complete the rotary extraction of the blocked soil in the through holes 6, realize the cleaning operation, maintain the stability of the water conservancy introduced into the inner cavity 13, and by restricting the size of the limiting plate 10, the limiting plate 10 located in the inner cavity 13 effectively restricts the up and down movement of the movable pipe 8, ensuring that the position of the movable pipe 8 is located in the through holes 6. In addition, by using the movable socket connection between the positioning block 7 and the movable pipe 8, the rotation stability of the movable pipe 8 is strengthened, avoiding deflection and jamming, and by using the communication of the alternately arrayed through holes 6 and communication grooves 22, the effect of water flow penetrating into the inner cavity 13 is strengthened, effectively reducing the water accumulation area on the top surface of the planting soil at the top of the protective frame 2.

[0036] As Figure 2 、 Figure 5 、 Figure 7 and Figure 8 As shown, a top groove 15 is opened on the top surface of the baffle 4. The inner surface of the top groove 15 is movably installed with a winding rod 16. A side hole 17 is opened inside the baffle 4. The side hole 17 communicates with the top groove 15. The inner surface of the side hole 17 is movably sleeved with the winding rod 16. A limiting ring 18 is fixedly connected to the outer surface of the winding rod 16. A protective net is wound around the outer surface of the winding rod 16.

[0037] During the use process, by using the cooperation of the top groove 15 and the side hole 17, the winding rod 16 can be stably installed inside the baffle 4, and the winding rod 16 can rotate stably. And by using the protective net wound on the winding rod 16, it is stretched outwards during layout and fixed with the help of the positioning hole 20 and the external insertion rod to complete the layout and fixation of the protective net, strengthening the protection effect. And when a part of the protective net is damaged, by continuing to stretch the protective net outwards, switching and filling are realized, improving the convenience of repair.

[0038] As Figure 1 、 Figure 2 and Figure 9As shown in the figure, positioning holes 20 are formed on the front surface of the protective frame 2, mounting holes 21 are formed inside the protective frame 2, a sleeve rod 14 is fixedly sleeved on the inner surface of the mounting hole 21, the sleeve rod 14 penetrates through the planting groove 5, the sleeve rod 14 is parallel to the mounting base 3, both the sleeve rod 14 and the mounting base 3 are arranged obliquely, side grooves 19 are formed on the outer surface of the sleeve rod 14, and the side grooves 19 are annularly and equally spaced on the outer surface of the sleeve rod 14.

[0039] During the use process, the fixed socketing of the sleeve rod 14 is completed by pressing the mounting hole 21, and the sleeve rod 14 is kept parallel and inclined to the mounting base 3, so that the sleeve rod 14 adapts to the filling of the planting soil, and the inclined mounting base 3 is convenient for guiding the water flow downward. By using the side grooves 19 annularly distributed on the outer surface of the sleeve rod 14, the contact area with the planting soil is increased, the soil solidification effect is further improved, and the cooperation between the roots of the planted vegetation and the sleeve rod 14 is used to strengthen the reinforcement of the soil.

[0040] Second Embodiment: When arranging the slope protection structure, the winding rod 16 of a large amount of protective nets after winding is movably installed in the top groove 15 of the baffle 4, and the protective net is pulled out and arranged upward on the front surface of the protective frame 2. In cooperation with the positioning holes 20 on the front surface of the protective frame 2, the protective net is fixedly clamped on the front surface of the protective frame 2 by using the clamping insertion rod. When a part of the protective net is damaged, the damaged part of the protective net is pulled, and then pulled upward continuously, so that the protective net wound on the winding rod 16 is pulled out, the damaged part of the protective net is re-filled, and the clamping and fixing are completed again in cooperation with the positioning holes 20.

[0041] First, by using the top groove 15 formed on the top surface of the baffle 4 and cooperating with the side holes 17, the movable socketing of the winding rod 16 is completed. And by using the protective net wound on the winding rod 16, during the actual arrangement, the protective net is drawn out and the protective arrangement tending to the inside between adjacent baffles 4 is completed. When a part of the protective net is damaged actually, by pulling out the winding rod 16 corresponding to the damaged part of the local protective net, the remaining intact protective net is drawn out and re-arranged and fixed, avoiding the problem that it is difficult to replace the overall arranged protective net when it is damaged. And the actual damage repair operation is simple, the actual switching process is convenient, and the damaged part is repaired effectively and conveniently by locally pulling out and winding the protective net, maintaining the long-term protection effect and having a good use effect.

[0042] Working principle and use process: During use, the protective frame 2 made of concrete material is arranged on the slope surface driven by the slope 1, and planting soil is filled in the planting groove 5, and vegetation is arranged on the planting soil. When arranging the slope protection structure, the winding rod 16 with a large amount of protective net wound up is movably installed in the top groove 15 of the baffle 4, and the protective net is pulled out and arranged upward on the front side of the protective frame 2, and the positioning hole 20 on the front side of the protective frame 2 is cooperated with, and the protective net is fixed and clamped on the front side of the protective frame 2 by using a clamping insertion rod. When a protective net is broken or damaged, the protective net at the damaged part is pulled, and continued to be pulled upward, so that the protective net wound on the winding rod 16 is pulled out, and the damaged protective net is refilled, and the positioning hole 20 is cooperated to complete the clamping and fixing again; when a large amount of rainwater flows on the slope, the rainwater flowing along the surface of the planting soil in the planting groove 5 flows downward between the mounting seat 3 and the baffle 4, and a large amount of water flows through the gap between the movable pipe 8 and the through hole 6 To the inner cavity 13 of the mounting seat 3, and part of the water flow flows into the inner cavity 13 through the connecting groove 22 on the top surface of the inclined mounting seat 3, and a large amount of water flow flowing into the inner cavity 13 at the top of the inclined mounting seat 3 flows downward along the inner cavity 13, and forms a flow beam in the gradual downward flow. As the rainwater flows downward in the inner cavity 13, the water flow on the outside of the front of the protective frame 2 gradually decreases, and the mud is filtered on the top surface of the connecting groove 22 and the through hole 6. When the water flow is large, the water in the inner cavity 13 flows downward rapidly and pushes the side plate 9 on the side of the movable tube 8 in the inner cavity 13, so that the side plate 9 is deflected by force, thereby driving the movable tube 8 to rotate. As the movable tube 8 rotates, the cleaning plate 11 on the outer surface of the movable tube 8 is driven to rotate, so that the cleaning plate 11 located inside the through hole 6 rotates, and cleans the blockage in the gap between the through hole 6 and the movable tube 8, so that the water flowing on the top of the mounting seat 3 quickly flows into the inner cavity 13 inside the mounting seat 3.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A slope protection structure, comprising a slope (1), characterized in that: A protective frame (2) is provided on the slope surface of the slope (1). A planting groove (5) is provided on the front surface of the protective frame (2). A mounting seat (3) is fixedly connected to the front surface of the protective frame (2). A baffle (4) is fixedly connected to the top surface of the mounting seat (3). A through hole (6) is formed in the top surface of the mounting seat (3). An activity tube (8) is movably sleeved on the inner surface of the through hole (6). Side plates (9) and cleaning plates (11) are respectively fixedly connected to the outer surface of the activity tube (8). An inner cavity (13) is formed in the mounting seat (3). A positioning block (7) is fixedly connected to the inside of the inner cavity (13). The positioning block (7) is movably sleeved with the bottom surface of the activity tube (8). A winding rod (16) is provided inside the baffle (4).

2. The slope protection structure according to claim 1, characterized in that: The cleaning plates (11) are symmetrically distributed on the outer surface of the activity tube (8), and the cleaning plates (11) are located inside the through hole (6).

3. A slope protection structure according to claim 1, characterized in that: A limiting plate (10) is fixedly connected to the outer surface of the activity tube (8). The limiting plate (10) is located inside the inner cavity (13), and the size of the limiting plate (10) is larger than that of the cleaning plate (11).

4. A slope protection structure according to claim 1, characterized in that: A sleeve hole (12) is formed in the bottom surface of the activity tube (8). The inner surface of the sleeve hole (12) is movably sleeved with the positioning block (7). The activity tubes (8) are arrayed on the top surface of the mounting seat (3).

5. A slope protection structure according to claim 1, characterized in that: A communication groove (22) is formed in the top surface of the mounting seat (3). The communication grooves (22) are arrayed on the top of the mounting seat (3) and communicate with the through hole (6).

6. A slope protection structure according to claim 1, characterized in that: A top groove (15) is formed in the top surface of the baffle (4). The inner surface of the top groove (15) is movably installed with the winding rod (16). A side hole (17) is formed in the baffle (4). The side hole (17) communicates with the top groove (15). The inner surface of the side hole (17) is movably sleeved with the winding rod (16).

7. A slope protection structure according to claim 6, characterized in that: A limiting ring (18) is fixedly connected to the outer surface of the winding rod (16). A protective net is wound around the outer surface of the winding rod (16).

8. A slope protection structure according to claim 1, characterized in that: A positioning hole (20) is formed in the front surface of the protective frame (2). A mounting hole (21) is formed in the protective frame (2). A sleeve rod (14) is fixedly sleeved on the inner surface of the mounting hole (21). The sleeve rod (14) penetrates through the planting groove (5). The sleeve rod (14) is parallel to the mounting seat (3). Both the sleeve rod (14) and the mounting seat (3) are inclined.

9. A slope protection structure according to claim 8, characterized in that: Side grooves (19) are formed in the outer surface of the sleeve rod (14). The side grooves (19) are annularly and equally spaced on the outer surface of the sleeve rod (14).

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